Linköpings universitet

Books

[1] H. Johansson, Tidsdiskreta System, (in Swedish), 311 pages, Linköping University, 2003.

[2] L. Wanhammar and H. Johansson, Digital Filters, 456 pages, Linköping University, 2002.

[3] L. Wanhammar and H. Johansson, Analoga Filter, (in Swedish), 370 pages, Linköping University, 2003.

[4] H. Johansson, Discrete-Time Systems, 367 pages, Linköping University, 2007.

[5] L. Wanhammar and H. Johansson, Digital Filters Using Matlab, 600 pages, Linköping University, 2011.

Book chapters

[1] L. Wanhammar and H. Johansson, "Design and implementation of multirate digital filters, in Multirate Systems: Design and Applications, G. Jovanovic-Dolecek, Ed., Idea Group Publ., 2002, ch. 9, pp. 257-292.

[2] A. Eghbali and H. Johansson, "Reconfigurable multirate systems in cognitive radios" in Foundation of Cognitive Radio Systems, S. Cheng, Ed., ISBN 978-953-51-0268-7, 2012, 22 pages.

Theses

[1] H. Johansson, A Study of Multirate FIR Filters, Master of Science Thesis, Linköping University, Jan. 1995.

[2] H. Johansson, High-Speed Recursive Digital Filters, Linköping Studies in Science and Technology, Licentiate Thesis no. 620, Linköping University, Sweden, May 1997.

[3] H. Johansson, Synthesis and Realization of High-Speed Recursive Digital Filters, Linköping Studies in Science and Technology, Diss. no. 534, Linköping University, Sweden, May 1998.

Reports

[1] H. Johansson and L. Wanhammar, Design of Bireciprocal Linear-Phase Lattice Wave Digital Filters, Report LiTH-ISY-R-1877, Linköping University, Sweden, Aug. 1996.

[2] H. Johansson and L. Wanhammar, Design of Linear-Phase Lattice Wave Digital Filters, Report LiTH-ISY-R-1930, Linköping University, Sweden, Mar. 1997.

[3] H. Johansson, Design of Linear-Phase FIR Filters Using Linear and Quadratic Programming, Report LiTH-ISY-R-2337, Linköping University, Sweden, Feb. 2001.

Papers

[1] H. Johansson and L. Wanhammar, "High-speed recursive filter structures composed of identical allpass subfilters for interpolation, decimation, and QMF banks with perfect magnitude reconstruction," IEEE Trans. Circuits Syst. II, vol. 46, no. 1, pp. 16-28, Jan. 1999.

[2] H. Johansson and L. Wanhammar, "Wave digital filter structures for high-speed narrow-band and wideband filtering," IEEE Trans. Circuits Syst. II, vol. 46, no. 6, pp. 726-741, June 1999.

[3] H. Johansson and L. Wanhammar, "Filter structures composed of allpass and FIR filters for interpolation and decimation by a factor of two," IEEE Trans. Circuits Syst. II, vol. 46, no. 7, pp. 896-905, July 1999.

[4] H. Johansson and L. Wanhammar, "High-speed recursive digital filters based on the frequency-response masking approach," IEEE Trans. Circuits Syst. II, vol. 47, no. 1, pp. 48-61, Jan. 2000.

[5] H. Johansson and P. Löwenborg, "Reconstruction of nonuniformly sampled bandlimited signals by means of digital fractional delay filters," IEEE Trans. Signal Processing, vol. 50, no. 11, pp. 2757-2767, Nov. 2002.

[6] H. Johansson and P. Löwenborg, "On the design of adjustable fractional delay FIR filters," IEEE Trans. Circuits Syst. II, vol. 50, no. 4, pp. 164-169, Apr. 2003.

[7] H. Johansson and T. Saramäki, "Two-channel FIR filter banks utilizing the frequency-response masking approach," in Circuits, Syst., Signal Processing, vol. 22, no. 2, pp. 157-192, Apr. 2003.

[8] O. Gustafsson, H. Johansson and L. Wanhammar, "Single-filter frequency masking high-speed recursive digital filters," in Circuits, Syst., Signal Processing, vol. 22, no. 2, pp. 219-238, Apr. 2003.

[9] P. Löwenborg, H. Johansson, and L. Wanhammar, "Two-channel digital and hybrid analog/digital multirate filter banks with very low complexity analysis or synthesis filters," IEEE Trans. Circuits Syst. II, vol. 50, no. 7, pp. 355-367, July 2003.

[10] E. Elias, P. Löwenborg, H. Johansson, and L. Wanhammar, "Tree-structured IIR/FIR uniform-band and octave-band filter banks with very low-complexity analysis or synthesis filters," in Signal Processing (EURASIP), vol. 83, no. 9, pp. 1997-2009, Sept. 2003.

[11] H. Johansson, "Multirate IIR filter structures for arbitrary bandwidths," in IEEE Trans. Circuits Syst. I, vol. 50, no. 12, pp. 1515-1529, Dec. 2003.

[12] O. Gustafsson, H. Johansson and L. Wanhammar, "Single filter frequency-response masking FIR filters," J. Circuits, Syst., Comput., vol. 12, no. 5, pp. 601-630, Oct. 2003.

[13] T. Saramäki, J. Yli-Kaakinen, and H. Johansson "Optimization of frequency-response-masking based FIR filters," J. Circuits, Syst., Comput., vol. 12, no. 5, pp. 563-591, Oct. 2003.

[14] H. Johansson and P. Löwenborg, "On linear-phase FIR filters with variable bandwidth," IEEE Trans. Circuits Syst. II, vol. 51, no. 4, pp. 181-184, Apr. 2004.

[15] P. Löwenborg, H. Johansson, and L. Wanhammar, "First-order sensitivity of complementary diplexers," IEEE Trans. Circuits Syst. II, vol. 51, no. 8, pp. 421-425, Oct. 2004.

[16] H. Johansson and O. Gustafsson, "Linear-phase FIR interpolation, decimation, and Mth-band filters utilizing the Farrow structure," IEEE Trans. Circuits Syst. I, vol. 52, no. 10, pp. 2197-2207, Oct. 2005.

[17] P. Löwenborg and H. Johansson, “Minimax design of adjustable-bandwidth linear-phase FIR filters,” IEEE Trans. Circuits Syst. I, vol. 53, no. 2, pp. 431–439, Feb. 2006.

[18] H. Johansson, “Two classes of frequency-response masking linear-phase FIR filters for interpolation and decimation,” Circuits, Syst., Signal Processing – Special issue on Computationally Efficient Digital Filters: Design and Applications, vol. 25, no. 2, pp. 175–200, Apr. 2006.

[19] H. Johansson and Per Löwenborg, "Reconstruction of nonuniformly sampled bandlimited signals by means of time-varying discrete-time FIR filters, J. Applied Signal Processing: Special Issue on Frames and Overcomplete Representations in Signal Processing, Communications, and Information Theory, vol. 2006, Article ID 64185, 18 pages, 2006.

[20] H. Johansson and P. Löwenborg, “Flexible frequency-band reallocation network using variable oversampled complex-modulated filter banks,” EURASIP J. Advances Signal Processing – Special Issue on Multirate Systems and Applications, vol. 2007, Article ID 63714, 15 pages, 2007.

[21] L. Rosenbaum, P. Löwenborg, and H. Johansson, “An approach for synthesizing cosine modulated filter banks based on the frequency-masking technique,” EURASIP J. Advances Signal Processing – Special Issue on Multirate Systems and Applications, vol. 2007, Article ID 68285, 13 pages, 2007.

[22] L. Rosenbaum and H. Johansson, “On low-delay frequency masking FIR filters,” Circuits, Syst., Signal Processing, vol. 26, no. 1, pp. 1-25, Feb. 2007.

[23] H. Johansson, P. Löwenborg, and K. Vengattaramane, “Least-squares and minimax design of polynomial impulse response FIR filters for reconstruction of two-periodic nonuniformly sampled signals,” IEEE Trans. Circuits Syst. I, vol. 54, no. 4, pp. 877–888, Apr. 2007.

[24] E. Hermanowicz and H. Johansson, “A complex variable fractional delay FIR filter structure,” IEEE Trans. Circuits, Syst. II, vol. 54, no. 9, pp. 785–789, Sept. 2007.

[25] A. Blad, H. Johansson, and P. Löwenborg, “Multirate formulation for mismatch sensitivity analysis of analog-to-digital converters that utilize parallel sigma-delta modulators,” EURASIP J. Advances Signal Processing, vol. 2008, Article ID 289184, 11 pages, 2008.

[26] A. Eghbali, H. Johansson, and P. Löwenborg, “A multimode transmultiplexer structure,” IEEE Trans. Circuits Syst. II, Special Issue on Multifunctional circuits and systems for future generations of wireless communications-I, vol. 55, no. 3, pp. 279–283, Mar. 2008.

[27] E. Hermanowicz, H. Johansson, and M. A. Rojewski, “A fractionally delaying complex Hilbert transform filter,“ IEEE Trans. Circuits Syst. II, vol. 55, no. 5, pp. 452–456, May 2008.

[28] H. Johansson and P. Löwenborg, “Least-squares filter design technique for the compensation of frequency-response mismatch errors in time-interleaved analog-to-digital converters,“ IEEE Trans. Circuits Syst. II, vol. 55, no. 11. pp. 1154–1158, Nov. 2008.

[29] A. Eghbali, H. Johansson, and P. Löwenborg, “Flexible frequency-band reallocation: Complex versus real,” Circuits, Syst., Signal Processing, vol. 28, no. 3, pp. 409–431, June 2009.

[30] H. Johansson, “A polynomial-based time-varying filter structure for the compensation of frequency-response mismatch errors in time-interleaved ADCs,” IEEE J. Selected Topics in Signal Processing, special issue on DSP Techniques for RF/Analog Circuit Impairments, vol. 3, no. 3, pp. 384–396, June 2009.

[31] L. Rosenbaum, P. Löwenborg, and H. Johansson, “Two classes of cosine-modulated IIR/IIR and IIR/FIR NPR filter banks,“ Circuits, Syst., Signal Processing, Special issue on low power digital filter design techniques and their applications, vol. 29, no. 1, pp. 103–133, Feb. 2010. doi: 10.1007/s00034-009-9115-6

[32] H. Johansson, "Farrow-structure-based reconfigurable bandpass linear-phase FIR filters for integer sampling rate conversion," IEEE Trans. Circuits Syst. II: Express Briefs, vol. 58, no. 1, pp. 46-50, Jan. 2011.

[33] A. Eghbali, H. Johansson, P. Löwenborg, and H. G. Göckler, "Dynamic frequency-band reallocation and allocation: from satellite-based communication systems to cognitive radios," J. Signal Processing Syst., Signal, Image, Video Technology, vol. 62, no. 2, 187-203, Feb. 2011.

[34] A. Eghbali, H. Johansson, and P. Löwenborg, "Reconfigurable nonuniform transmultiplexers using uniform modulated filter banks," IEEE Trans. Circuits Syst. I: Regular Papers, vol. 58, no. 3, pp. 539-547, Mar. 2011.

[35] Z. U. Sheikh and H. Johansson, "A class of wide-band linear-phase FIR differentiators using a two-rate approach and the frequency-response masking technique," IEEE Trans. Circuits Syst. I: Regular Papers, vol. 58, no. 8, pp. 1827-1839, Aug. 2011.

[36] A. Eghbali, T. Saramäki, and H. Johansson, "On two-stage Nyquist pulse shaping filters," IEEE Trans. Signal Processing, vol. 60, no. 1, pp. 483-488, Jan. 2012.

[37] Z. U. Sheikh and H. Johansson, "A technique for efficient realization of wide-band FIR LTI systems," IEEE Trans. Signal Processing, vol. 60, no. 3, pp. 1482-1486, Mar. 2012.

[38] A. Eghbali, H. Johansson, and P. Löwenborg, "A class of Farrow-structure-based multimode transmultiplexer," Circuits Syst. Signal Processing, DOI: 10.1007/s00034-011-9351-4.

[39] H. Johansson, "Fractional-delay and supersymmetric Mth-band linear-phase FIR filters utilizing partially symmetric and antisymmetric impulse responses," IEEE Trans. Circuits Syst. II - Express Briefs, accepted.

[40] Z. Sheikh and H. Johansson, "Efficient wide-band FIR LTI systems derived via multi-rate techniques and sparse bandpass filters," IEEE Trans. Signal Processing, accepted.

[41] H. Johansson and E. Hermanowicz, "Two-rate based low-complexity variable fractional-delay FIR filter structures," IEEE Trans. Circuits Syst. I: Regular Papers, accepted.

Conference papers

[1] H. Johansson, K. Palmkvist, M. Vesterbacka, and L. Wanhammar, "High-speed lattice wave digital filters for interpolation and decimation," in Proc. National Conf. Radio Science (RVK), pp. 543-547, Luleå, Sweden, June 1996.

[2] H. Johansson and L. Wanhammar, "Two-stage polyphase interpolators and decimators for sample rate conversions with prime numbers," in Proc. VIII European Signal Processing Conf., Trieste, Italy, Sept. 10-13, 1996, vol. II, pp. 1207-1210.

[3] H. Johansson and L. Wanhammar, "An algorithm for the adaptor coefficients of Richards' structures," in Proc. IEEE Nordic Signal Processing Symp., Espoo, Finland, Sept. 1996, pp. 351-354.

[4] H. Johansson and L. Wanhammar, "High-speed wide-band lattice wave digital filters," in Proc. IEEE Nordic Signal Processing Symp., Espoo, Finland, Sept. 1996, pp. 355-358.

[5] H. Johansson and L. Wanhammar, "High-speed narrow-band lattice wave digital filters," in Proc. IEEE Int. Conf. Electronics, Circuits, Syst., Rodos, Greece, Oct. 10-13, 1996, vol. 1, pp. 390-393.

[6] H. Johansson, K. Palmkvist, and L. Wanhammar, "Design and implementation of a high-speed interpolation and decimation filter," in Proc. European Microelectronics Application Conf., Barcelona, May 28-30, 1997, pp. 97-100.

[7] H. Johansson and L. Wanhammar, "High-speed recursive filtering using the frequency response masking approach," in Proc. IEEE Int. Symp. Circuits Syst., Hong Kong, June 9-12, 1997, vol. IV, pp. 2208-2211.

[8] H. Johansson and L. Wanhammar, "High-speed recursive filter structures for interpolation and decimation with factors of two," in Proc. European Conf. Circuit Theory Design, Budapest, Hungary, Aug. 31-Sept. 3, 1997, vol. 2, pp. 555-560.

[9] H. Johansson and L. Wanhammar, "Filter structures composed of allpass subfilters for high-speed narrow-band and wideband filtering," in Proc. European Conf. Circuit Theory Design, Budapest, Hungary, Aug. 31-Sept. 3, 1997, vol. 2, pp. 561-566.

[10] H. Johansson and L. Wanhammar, "A digital filter structure composed of allpass filters and an FIR filter for wideband filtering," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Cairo, Egypt, Dec. 15-18, 1997, vol. 1, pp. 249-253.

[11] H. Johansson and L. Wanhammar, "Filter structures composed of allpass and FIR filters for interpolation and decimation with factors of two," in Proc. IEEE Int. Symp. Circuits Syst., Monterey, CA, May 31-June 3, 1998, vol. V, pp. 45-48.

[12] H. Johansson and L. Wanhammar, "Digital Hilbert transformers composed of identical allpass subfilters," in Proc. IEEE Int. Symp. Circuits Syst., Monterey, CA, May 31-June 3, 1998, vol. V, pp. 437-440.

[13] H. Johansson and L. Wanhammar, "A filter structure based on the frequency-response masking approach for high-speed recursive filtering," in Proc. IEEE Nordic Signal Processing Symp., Denmark, June 8-11, 1998, pp. 165-168.

[14] M. Vesterbacka, H. Johansson, K. Palmkvist, and L. Wanhammar, "Implementation of narrow-band lattice wave digital filters," in Proc. IEEE Nordic Signal Processing Symp., Denmark, June 8-11, 1998, pp. 153-156.

[15] H. Johansson and T. Saramäki, "Two-channel FIR filter banks based on the frequency-response masking approach," in Proc. Second Int. Workshop Transforms Filter Banks, Brandenburg an der Havel, Germany, Mar. 5-7, 1999, pp. 367-382.

[16] H. Johansson, "Multirate single-stage and multistage structures for high-speed recursive digital filtering," in Proc. IEEE Int. Symp. Circuits Syst., Orlando, Florida, May 30-June 2, 1999, vol. 3, pp. 291-294.

[17] H. Johansson and T. Saramäki, "A class of complementary IIR filters," in Proc. IEEE Int. Symp. Circuits Syst., Orlando, Florida, May 30-June 2, 1999, vol. 3, pp. 299-302.

[18] H. Johansson and L. Wanhammar, "High-speed recursive digital filters based on frequency masking techniques," in Proc. National Conf. Radio Science (RVK), Karlskrona, Sweden, June 14-17, 1999, vol. 1, pp. 357-361.

[19] H. Johansson, "A class of high-speed approximately linear-phase recursive digital filters based on the frequency-response masking approach," in Proc. Midwest Symp. Circuits Syst., Las Cruces, New Mexico, USA, Aug. 1999.

[20] P. Löwenborg, H. Johansson, and L. Wanhammar, "A class of two-channel hybrid analog/digital filter banks," in Proc. Midwest Symp. Circuits Syst., Las Cruces, New Mexico, USA, Aug. 1999.

[21] H. Johansson, "An approach to increase the maximal sample frequency of lattice wave digital filters based on circulators and Richards' structures," in Proc. European Conf. Circuit Theory Design, Stresa, Italy, Aug. 29-Sept. 2, 1999, vol. 2, pp. 1319-1322.

[22] P. Löwenborg, H. Johansson, and L. Wanhammar, "On the frequency-response of M-channel mixed analog and digital maximally decimated filter banks", in Proc. European Conf. Circuit Theory Design, Stresa, Italy, Aug. 29-Sept. 2, 1999, vol. 1, pp. 321-324.

[23] P. Löwenborg, H. Johansson, and L. Wanhammar. "A design procedure for two-channel mixed analog and digital filter banks for A/D conversion using minimax optimization," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Pafos, Cyprus, Sept. 5-8, 1999, vol. III, pp. 1189-1192.

[24] H. Ohlsson, H. Johansson, and L. Wanhammar. "Implementation of a combined high-speed interpolation and decimation wave digital filter," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Pafos, Cyprus, Sept. 5-8, 1999, vol. II, pp.721-724.

[25] H. Ohlsson, H. Johansson, and L. Wanhammar, "Design of a Digital Down Converter Using High Speed Digital Filters," in Proc. GHz Symp., Gothenburg, Sweden, Mar. 13-14, 2000.

[26] O. Gustafsson, H. Johansson, and L. Wanhammar, "Design and efficient implementation of high-speed narrow-band recursive digital filters using single filter frequency masking techniques," in Proc. IEEE Int. Symp. Circuits Syst., Geneva, Switzerland, May 28-31, 2000.

[27] H. Johansson, "New classes of frequency-response masking FIR filters," in Proc. IEEE Int. Symp. Circuits Syst., Geneva, Switzerland, May 28-31, 2000.

[28] P. Löwenborg, H. Johansson, and L. Wanhammar, "A class of two-channel approximately perfect reconstruction hybrid analog/digital filter banks," in Proc. IEEE Int. Symp. Circuits Syst., Geneva, Switzerland, May 28-31, 2000.

[29] E. Elias, P. Löwenborg, H. Johansson, and L. Wanhammar, "M-channel tree-structured IIR/FIR filter banks with low-complexity analysis filters," in Proc. IEEE Nordic Signal Processing Symp., Kolmården, Norrköping, Sweden, June 13-15, 2000, pp. 433-436.

[30] H. Johansson, "A Class of High-Speed Wide-Band Frequency Masking Recursive Digital Filters with Approximately Linear Phase," in Proc. IEEE Nordic Signal Processing Symp., Kolmården, Norrköping, Sweden, June 13-15, 2000.

[31] P. Löwenborg, H. Johansson, and L. Wanhammar, "A Two-Channel Hybrid Analog and IIR Digital Filter Bank Approximating Perfect Magnitude Reconstruction," in Proc. IEEE Nordic Signal Processing Symp., Kolmården, Norrköping, Sweden, June 13-15, 2000.

[32] P. Löwenborg, H. Johansson, and L. Wanhammar, "Two-channel hybrid analog/digital filter banks with alias-free subbands," in Proc. Midwest Symp. Circuits Syst., Lansing, Michigan, USA, Aug. 9-11, 2000.

[33] O. Gustafsson, H. Johansson, and Lars Wanhammar, "Design and efficient implementation of narrow-band single filter frequency masking FIR filters," in Proc. X European Signal Processing Conf., Tampere, Finland, Sept. 5-8, 2000.

[34] H. Johansson, "On high-speed recursive digital filters," in Proc. X European Signal Processing Conf., Tampere, Finland, Sept. 5-8, 2000.

[35] P. Löwenborg, H. Johansson, and L. Wanhammar, "A class of two-channel IIR/FIR filter banks," in Proc. X European Signal Processing Conf., Tampere, Finland, Sept. 5-8, 2000.

[36] O. Gustafsson, H. Johansson, and L. Wanhammar, "Design and efficient implementation of single filter frequency-response masking FIR filters," in Proc. IEEE Int. Symp. Intelligent Signal Processing Communication Systems, Hawaii, Nov. 5-8, 2000, vol. 1, pp. 135-140.

[37] H. Ohlsson, H. Johansson, and L. Wanhammar, "Implementation of a combined interpolator and decimator for an OFDM system demonstrator," in Proc. NORCHIP, Turku, Finland, nov. 6-7, 2000, pp. 47-52.

[38] E. Elias, P. Löwenborg, H. Johansson, and L. Wanhammar, "Design of M-channel tree-structured filter banks with very low-complexity analysis filters," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Jounieh, Lebanon, Dec. 17-20, 2000.

[39] P. Löwenborg, H. Johansson, and L. Wanhammar, "A survey of filter bank A/D converters," in Proc. Swedish System-on-Chip Conf., Arild, Sweden, Mar. 20-21, 2001.

[40] E. Elias, P. Löwenborg, H. Johansson, and L. Wanhammar, "Tree-structured IIR/FIR octave-band filter banks with very low-complexity analysis or synthesis filters," in Proc. IEEE Int. Symp. Circuits Syst., Sydney, Australia, May 6-9, 2001, vol. 2, pp. 533-536.

[41] O. Gustafsson, H. Johansson, and Lars Wanhammar, "Narrow-band and wide-band single filter frequency masking FIR filters," in Proc. IEEE Int. Symp. Circuits Syst., Sydney, Australia, May 6-9, 2001, vol. 2, pp. 181-184.

[42] H. Johansson, and P. Löwenborg, "Reconstruction of nonuniformly sampled bandlimited signals using digital fractional delay filters," in Proc. IEEE Int. Symp. Circuits Syst., Sydney, Australia, May 6-9, 2001, vol. 2, pp. 593-596.

[43] P. Löwenborg and H. Johansson, "Quantization noise in filter bank analog-to-digital converters," in Proc. IEEE Int. Symp. Circuits Syst., Sydney, Australia, May 6-9, 2001, vol. 2, pp. 601-604.

[44] T. Saramäki and H. Johansson, "Optimization of FIR filters using the frequency-response masking approach," in Proc. IEEE Int. Symp. Circuits Syst., Sydney, Australia, May 6-9, 2001, vol. 2, pp. 177-180.

[45] O. Gustafsson, H. Johansson, and Lars Wanhammar, "Narrow-band and wide-band high-speed recursive digital filters using single filter frequency masking techniques," in Proc. IEEE Int. Symp. Signal Processing, Applications, Kuala-Lumpur, Malaysia, Aug. 13-16, 2001, vol. 1, pp. 36­39.

[46] P. Löwenborg, H. Johansson, and L. Wanhammar, "Analysis of gain and time-skew errors in filter bank based A/D converters,"  in Proc. Midwest Symp. Circuits Syst., Dayton, Ohio, USA, Aug. 13-17, 2001.

[47] P. Löwenborg, E. Elias, H. Johansson, and L. Wanhammar, "Two-channel IIR/FIR filter banks with very low-complexity analysis or synthesis filters: Finite wordlength effects," in Proc. Midwest Symp. Circuits Syst., Dayton, Ohio, USA, Aug. 13-17, 2001.

[48] H. Johansson, and P. Löwenborg, "Reconstruction of nonuniformly sampled bandlimited signals using digital fractional delay filters: Error and quantization noise analysis," in Proc. European Conf. Circuit Theory Design, Espoo, Finland, Aug. 28-31, 2001, vol. 2, pp. 293-296.

[49] H. Johansson and P. Löwenborg, "On adjustable fractional delay FIR filters and their design," in Proc. European Conf. Circuit Theory Design, Espoo, Finland, Aug. 28-31, 2001, vol. 2, pp. 297-300.

[50] O. Gustafsson, H. Johansson, and Lars Wanhammar, "An MILP approach for the design of linear-phase FIR filters with minimum number of signed-power-of-two terms," in Proc. European Conf. Circuit Theory Design, Espoo, Finland, Aug. 28-31, 2001, vol. 2, pp. 217-220.

[51] H. Ohlsson, O. Gustafsson, H. Johansson, and L. Wanhammar, "Implementation of bit-parallel lattice wave digital filters with increased maximal sample rate," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Malta, Sept. 2-5, 2001, vol. 1, pp. 71-74.

[52] H. Johansson, "Multirate approximately linear-phase IIR filter structures for arbitrary bandwidths," in Proc. IEEE Int. Symp. Circuits Syst., Phoenix, USA, May 26-29, 2002.

[53] H. Johansson and P. Löwenborg, "Reconstruction of a class of nonuniformly sampled and decimated bandlimited signals," in Proc. IEEE Int. Symp. Circuits Syst., Phoenix, USA, May 26-29, 2002.

[54] L. Svensson and H. Johansson, "Frequency-response masking FIR filters with short delay," in Proc. IEEE Int. Symp. Circuits Syst., Phoenix, USA, May 26-29, 2002.

[55] P. Löwenborg and H. Johansson, "A technique for correction of static gain- and time-skew errors in time-interleaved ADCs,"  in Proc. Swedish System-on-Chip Conf., Falkenberg, Sweden, Mar. 18-19, 2002.

[56] L. Svensson, P. Löwenborg, and H. Johansson, "Cosine modulated causal IIR NPMR and NPR filter banks," in Proc. Swedish System-on-Chip Conf., Falkenberg, Sweden, Mar. 18-19, 2002.

[57] L. Svensson and H. Johansson, "Narrow-band and wide-band frequency masking FIR filters with short delay," in Proc. National Conf. Radio Science (RVK), Stockholm, Sweden, June 10-13, 2002.

[58] L. Svensson, P. Löwenborg, and H. Johansson, "A class of cosine modulated causal IIR filter banks," in Proc. IEEE Int. Conf. Electronics Circuits Syst., Dubrovnik, Croatia, Sept. 15-18, 2002.

[59] H. Johansson, "Efficient FIR filter structures based on the frequency-response masking approach for interpolation and decimation by a factor of two," in Proc. Second Int. Workshop Spectral Methods Multirate Signal Processing, Toulouse, France, Sept. 7-8, 2002.

[60] P. Löwenborg and H. Johansson, "Mitigation of static gain- and time-skew errors in time-interleaved ADCs using a system of digital fractional delay filters," in Proc. Second Int. Workshop Spectral Methods Multirate Signal Processing, Toulouse, France, Sept. 7-8, 2002.

[61] L. Svensson, P. Löwenborg, and H. Johansson, "Asymmetric cosine modulated causal IIR/FIR NPR filter banks," in Proc. Second Int. Workshop Spectral Methods Multirate Signal Processing, Toulouse, France, Sept. 7-8, 2002.

[62] H. Johansson, "A class of Mth-band linear-phase FIR filters synthesized using the frequency-response masking approach," in Proc. IEEE Nordic Signal Processing Symp., Hurtigruten, Norway, Oct. 4-7, 2002.

[63] P. Löwenborg, H. Johansson, and L. Wanhammar, "First-order sensitivity of constant-resistance analog filters with applications to filter banks," in Proc. IEEE Nordic Signal Processing Symp., Hurtigruten, Norway, Oct. 4-7, 2002.

[64] L. Svensson, P. Löwenborg, and H. Johansson, "Modulated M-channel FIR filter banks utilizing the frequency response masking approach," in Proc. IEEE Nordic Signal Processing Symp., Hurtigruten, Norway, Oct. 4-7, 2002.

[65] L. Rosenbaum and H. Johansson, "Design of modulated FIR filter banks using the frequency-response masking approach," in Proc. Swedish System-on-Chip Conf., Apr. 2003.

[66] L. Rosenbaum, P. Löwenborg, and H. Johansson, "Cosine and Sine modulated M-channel FIR filter banks utilizing the frequency response masking approach," in Proc. IEEE Int. Symp. Circuits Syst., Bangkok, Thailand, May 25-28, 2003.

[67] P. Löwenborg and H. Johansson, "Linear programming design of linear-phase FIR filters with variable bandwidth," in Proc. IEEE Int. Symp. Circuits Syst., Bangkok, Thailand, May 25-28, 2003.

[68] H. Johansson, "On lowpass and highpass IIR filters with an adjustable bandwidth," in Proc. European Conf. Circuit Theory Design, Krakow, Poland, Sept. 1-4, 2003.

[69] P. Löwenborg and H. Johansson, "Analysis of continuous-time-input SD A/D modulators and their generalizations," in Proc. European Conf. Circuit Theory Design, Krakow, Poland, Sept. 1-4, 2003.

[70] L. Rosenbaum and H. Johansson, "Two-channel linear-phase FIR filter banks utilizing the frequency-response masking approach," in Proc. European Conf. Circuit Theory Design, Krakow, Poland, Sept. 1-4, 2003.

[71] H. Johansson, "Efficient frequency-response-masking based FIR filter structures for interpolation and decimation," in Proc. Third Int. Workshop Spectral Methods Multirate Signal Processing, Barcelona, Spain, Sept. 13-14, 2003.

[72] B. Soltanian, T. Saramäki, and H. Johansson, "Design of optimum recursive filters with double zeros on the unit circle leading to symmetric ladder wave digital filter structures," in Proc. Int. Symp. Image, Signal Processing, Analysis, Rome, Italy, Sept. 18-20, 2003.

[73] O. Gustafsson, H. Johansson, and L. Wanhammar, "MILP design of frequency-response masking FIR filters with few SPT terms," in Proc. 1st Int. Symp. Control, Commun., Signal Processing, Hammamet, Tunisia, Mar. 21-24, 2004.

[74] H. Johansson, "On the design of IIR bandpass filters with an adjustable bandwidth and centre frequency," in Proc. IEEE Int. Symp. Circuits Syst., Vancouver, Canada, May 2004.

[75] H. Johansson and O. Gustafsson, "Mth-band linear-phase FIR filter interpolators and decimators utilizing the Farrow structure," in Proc. IEEE Int. Symp. Circuits Syst., Vancouver, Canada, May 2004.

[76] P. Löwenborg and H. Johansson, "Minimax design of linear-phase FIR filters with adjustable bandwidths," in Proc. IEEE Int. Symp. Circuits Syst., Vancouver, Canada, May 2004.

[77] H. Johansson and P. Löwenborg, "Reconstruction of nonuniformly sampled bandlimited signals using time-varying discrete-time FIR filters," in Proc. XII European Signal Processing Conf., Vienna, Austria, Sept. 6-10, 2004.

[78] M. Olsson, P. Löwenborg, and H. Johansson, "Scaling of multistage interpolators," in Proc. XII European Signal Processing Conf., Vienna, Austria, Sept. 6-10, 2004.

[79] H. Johansson and P. Löwenborg, "Reconstruction of periodically nonuniformly sampled bandlimited signals using time-varying FIR filters," in Proc. Fourth Int. Workshop Spectral Methods Multirate Signal Processing, Vienna, Austria, Sept. 11-12, 2004.

[80] M. Olsson, P. Löwenborg, and H. Johansson, "Scaling and round-off noise in multistage interpolators and decimators," in Proc. Fourth Int. Workshop Spectral Methods Multirate Signal Processing, Vienna, Austria, Sept. 11-12, 2004.

[81] M. Olsson and H. Johansson, "Blind OFDM carrier frequency offset estimation by locating null subcarriers," in Proc. 9th Int. OFDM-Workshop, Dresden, Germany, Sept. 15-16, 2004.

[82] H. Ohlsson, B. Mesgarzadeh, K. Johansson, O. Gustafsson, P. Löwenborg, H. Johansson, and A. Alvandpour, "A 16 GSPS 0.18 um CMOS decimator for single-bit sigma-delta-modulation," in Proc. NORCHIP 2004, Oslo, Norway, 2004.

[83] H. Johansson and P. Löwenborg, "Flexible frequency-band reallocation network based on variable oversampled complex-modulated filter banks, in Proc. IEEE Int. Conf. Acoust. Speech, Signal Processing, Philadelphia, USA, Mar. 2005.

[84] P. Löwenborg, L.Rosenbaum, and H. Johansson, "On flexible analog/digital interfaces for multi-mode communication," in Proc. Swedish System-on-Chip Conf., Tamsvik Konferens & Herrgård, Sweden, Apr. 18-19, 2005.

[85] M. Olsson and H. Johansson, "Estimating the OFDM carrier frequency offset by locating null subcarriers," in Proc. Swedish System-on-Chip Conf., Tamsvik Konferens & Herrgård, Sweden, Apr. 18-19, 2005.

[86] L. Rosenbaum and H. Johansson, "Narrow-band and wide-band short-delay frequency-masking FIR filters," in Proc. National Conf. Radio Science (RVK), Linköping, Sweden, June 14-16, 2005.

[87] M. Olsson and H. Johansson, "An overview of OFDM synchronization techniques," in Proc. National Conf. Radio Science (RVK), Linköping, Sweden, June 14-16, 2005.

[88] E. Hermanowicz and H. Johansson, "On designing minimax adjustable wideband fractional delay FIR filters using two-rate approach," in Proc. European Conf. Circuit Theory Design, Cork, Ireland, Aug. 29-Sept. 1, 2005.

[89] M. Olsson and H. Johansson, "OFDM carrier frequency offset estimation using null subcarriers", in Proc. 10th Int. OFDM Workshop, Hamburg, Germany, Aug. 31-Sept. 1, 2005.

[90] H. Johansson, P. Löwenborg, and K. Vengattaramane, “Reconstruction of two-periodic nonuniformly sampled signals using polynomial impulse response time-varying FIR filters,” in Proc. IEEE Int. Symp. Circuits Syst., Kos, Greece, May 21–24, 2006.

[91] C. Vogel and H. Johansson, “Time-interleaved analog-to-digital converters: Status and future directions,” in Proc. IEEE Int. Symp. Circuits Syst., Kos, Greece, May 21–24, 2006.

[92] M. Olsson and H. Johansson, “Delay estimation using adjustable fractional delay all-pass filters,” in Proc. IEEE Nordic Signal Processing Symp., Iceland, June. 7–9, 2006.

[93] H. Johansson, “Adjustable fractional-delay filters utilizing the Farrow structure and multirate techniques,” in Proc. Sixth Int. Workshop Spectral Methods Multirate Signal Processing, Florence, Italy, Sept. 1–2, 2006.

[94] H. Johansson, P. Löwenborg, and K. Vengattaramane, “Reconstruction of M-periodic nonuniformly sampled signals using multivariate impulse response time-varying FIR filters,” in Proc. XII European Signal Processing Conf., Florence, Italy, Sept. 4–8, 2006.

[95] M. Olsson, P. Löwenborg, and H. Johansson, “Time-delay estimation using Farrow-based fractional-delay FIR filters: Approximation vs. estimation errors,” in Proc. XII European Signal Processing Conf., Florence, Italy, Sept. 4–8, 2006.

[96] L. Rosenbaum, H. Johansson, and P. Löwenborg, “Oversampled complex-modulated causal IIR filter banks for flexible frequency-band reallocation networks,” in Proc. XII European Signal Processing Conf., Florence, Italy, Sept. 4–8, 2006.

[97] A. Blad, H. Johansson, and P. Löwenborg, “Design trade-offs for linear-phase FIR filters and SD-modulators,” in Proc. XII European Signal Processing Conf., Florence, Italy, Sept. 4–8, 2006.

[98] O. Gustafsson and H. Johansson, “Efficient implementation of FIR filter based rational sampling rate converters using constant matrix multiplication,” in Proc. IEEE Asilomar Conf. Signals, Syst., Comp., Pacific Grove, California, USA, Oct. 29 – Nov. 1, 2006.

[99] A. Blad, C. Svensson, H. Johansson, S. Andersson, “An RF Sampling Radio Frontend Based on Sigma-Delta Conversion,” in Proc. IEEE Nordic Event in ASIC Design Conf., Linköping, Sweden, Nov. 20-21, 2006.

[100] A. Blad, H. Johansson, and P. Löwenborg, “A general formulation of analog-to-digital converters using parallel sigma-delta modulators and modulation sequences,” in Proc. IEEE Asia Pacific Conf. Circuits Syst., Singapore, Dec. 4–7, 2006.

[101] H. Johansson, O. Gustafsson, K. Johansson, and L. Wanhammar “Adjustable fractional-delay FIR filters using the Farrow structure and multirate techniques,” in Proc. IEEE Asia Pacific Conf. Circuits Syst., Singapore, Dec. 4–7, 2006.

[102] O. Gustafsson, K. Johansson, H. Johansson, and L. Wanhammar, “Implementation of polyphase decomposed FIR filters for interpolation and decimation using multiple constant multiplication techniques,” in Proc. IEEE Asia Pacific Conf. Circuits Syst., Singapore, Dec. 4–7, 2006.

[103] O. Gustafsson and H. Johansson, “Complexity comparison of linear-phase half-band and general FIR filters,” in Proc. IEEE Asia Pacific Conf. Circuits Syst., Singapore, Dec. 4–7, 2006.

[104] O. Gustafsson and H. Johansson, “Complexity comparison of linear-phase Mth-band and general FIR filters,” in Proc. IEEE Symp. Circuts Syst., New Orleans, USA, May 27–30, 2007.

[105] M. Olsson, H. Johansson, and P. Löwenborg, “Simultaneous estimation of gain, delay, and offset utilizing the Farrow structure,” in Proc. European Conf. Circuit Theory Design, Seville, Spain, Aug. 26-30, 2007.

[106] A. Eghbali, H. Johansson, and P. Löwenborg, “An arbitrary bandwidth transmultiplexer and its application to flexible frequency-band reallocation networks,” in Proc. European Conf. Circuit Theory Design, Seville, Spain, Aug. 26-30, 2007.

[107] A. Eghbali, H. Johansson, and P. Löwenborg, “Flexible frequency-band reallocation MIMO networks for real signals,” in Proc. Int. Symp. Image, Signal Processing, Analysis, Istanbul, Turkey, Sept. 27-29, 2007.

[108] A. Eghbali, O. Gustafsson, H. Johansson, and P. Löwenborg, “On the complexity of multiplierless direct and polyphase FIR filter structures,” in Proc. Int. Symp. Image, Signal Processing, Analysis, Istanbul, Turkey, Sept. 27-29, 2007.

[109] O. Gustafsson, L. S. DeBrunner, V. DeBrunner, and H. Johansson, “On the design of sparse half-band like FIR filters,“ Asilomar Conf. Signals Syst. Comp., Pacific Grove, CA, Nov. 4-7, 2007.

[110] S. Ahmad, N. Ahsan, A. Blad, R. Ramzan, H. Johansson, J. Dabrowski, and C. Svensson, “Feasibility of filter-less RF receiver front-end”, in Proc. GigaHertz Symposium, Gothenburg, 5-6 Mar. 2008.

[111] A. Eghbali, H. Johansson, and P. Löwenborg, “A multi-standard transmultiplexer based on the Farrow structure” in Proc. IEEE Int. Symp. Circuits Syst., Seattle, Washington, USA, May 18–21, 2008.

[112] M. Abbas, F. Qureshi, Z. Sheikh, O. Gustafsson, H. Johansson, and K. Johansson, “Comparison of multiplierless implementation of nonlinear-phase versus linear-phase FIR filters,” Asilomar Conf. Signals Syst. Comp., Pacific Grove, CA, Oct. 26–29, 2008.

[113] H. Johansson, “On the compensation of frequency-response mismatch errors in time-interleaved ADCs,“ in Proc. Int. Conf. Microelectronics, Sharja, UAE, Dec. 2008, (invited paper).

[114] H. Johansson and C. Vogel, “Efficient design and implementation of sampling rate conversion, resampling, and signal reconstruction methods,” in Proc. 8th Int. Conf. Sampling Theory and Applications, Marseille, France, May 18–22, 2009.

[115] M. Abbas, O. Gustafsson, and H. Johansson, "Scaling of fractional delay filters based on the Farrow structure," in Proc. IEEE Int. Symp. Circuits Syst., Taipei, Taiwan, May 24–27, 2009.

[116] A. Eghbali, H. Johansson, and P. Löwenborg, “On the filter design for a class of multimode transmultiplexers,” in Proc. IEEE Int. Symp. Circuits Syst., Taipei, Taiwan, May 24–27, 2009.

[117] Z. Sheikh and H. Johansson, “Wideband linear-phase FIR differentiators utilizing multirate and frequency-response masking techniques,” in Proc. IEEE Int. Symp. Circuits Syst., Taipei, Taiwan, May 24–27, 2009.

[118] A. Eghbali, H. Johansson, and P. Löwenborg, "Reconfigurable nonuniform transmultiplexers based on uniform filter banks," in Proc. IEEE Int. Symp. Circuits Syst., Paris, France, May 30–June 2, 2010.

[119] A. Eghbali, H. Johansson, T. Saramäki, and P. Löwenborg, "On the design of adjustable fractional delay FIR filters using digital differentiators," in Proc. IEEE Int. Conf. Green Circuits Syst., Shanghai, China, June 21–23, 2010.

[120] A. Peng, S. Zhuang, H. Johansson, and L. Wanhammar, "On filter symmetry polarities and lengths of M-channel linear-phase PR filter banks," in Proc. 3rd International Congress on Image and Signal Processing, Yantai, China, Oct. 15-17, 2010, vol. 6, pp. 3008-3012.

[121] A. Eghbali, H. Johansson, and T. Saramäki, "A new structure for reconfigurable two-stage Nyquist pulse shaping filters," in Proc. IEEE Midwest Symp. Circuits Syst., Seoul, South Korea, Aug. 2011.

[122] A. Eghbali and H. Johansson, "Complexity reduction in low-delay Farrow-structure-based variable fractional delay FIR filters utilizing linear-phase subfilters," in Proc. European Conf. Circuit Theory Design, Linköping, Sweden, Aug. 29-31, 2011.

[123] Z. U. Sheikh, A. Eghbali, and H. Johansson, "Linear-phase FIR digital differentiator order estimation," in Proc. European Conf. Circuit Theory Design, Linköping, Sweden, Aug. 29-31, 2011.

[124] H. Johansson, A. Eghbali, and J. Lahti, "Tree-structured linear-phase Nyquist FIR filter interpolators and decimators," in Proc. IEEE Int. Symp. Circuits Syst., Seoul, Korea, May 20-23, 2012.

[125] A. Eghbali and H. Johansson, "Reconfigurable two-stage Nyquist filters utilizing the Farrow structure," in Proc. IEEE Int. Symp. Circuits Syst., Seoul, Korea, May 20?23, 2012.

Patents

[1] H. Johansson and P. Löwenborg, “Reconstruction of nonuniformly sampled bandlimited signals using digital filter banks,” Swedish patent 0003549-3, United States Patent 6,476,754.

[2] H. Johansson and P. Löwenborg, "Estimation of timing errors in a time-interleaved analog-to-digital converter system," United States Patent 7,741,982, June 22, 2010.

[3] H. Johansson, "Compensation of mismatch errors in a time-interleaved analog-to-digital converter", United States Patent 7,978,104, July 12, 2011.

[4] H. Johansson and P. Löwenborg, "Compensation of mismatch errors in a time-interleaved analog-to-digital converter", United States Patent 8,009,070, Aug. 30, 2011.