SIGNAL PROCESSING IN TELECOMMUNICATIONS RESEARCH GROUP

Publications of Professor (Dr.Tech.) Timo I. Laakso

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Books and Book Chapters
Theses
International Journal Papers
International Conference Papers
Other

Books and Book Chapters

  1. T. Laakso, L. P. Sabel, V. Rose, A. Yardim, and G. D. Cain, "A new delay Root-Nyquist filter design method for signals corrupted by ACI", In: T. Wysocki, H. Razavi and B. Honary (Eds.) Digital Signal Processing for Communication Systems, pp. 167-176, Kluwer Academic Publishers, London 1997.

Theses

  1. Dr. Tech. Thesis (1991): "Error feedback for reduction of quantization errors due to arithmetic operations in recursive digital filters," Helsinki University of Technology, Department of Electrical Engineering, Laboratory of Signal Processing and Computer Technology.
  2. Licentiate Thesis (1990): "Reduction of quantization noise in recursive digital filters using error feedback," Helsinki University of Technology, Department of Electrical Engineering, Laboratory of Signal Processing and Computer Technology.
  3. Master's Thesis (1987): "Comparison of signal processor implementations of recursive filter structures," Helsinki University of Technology, Department of Electrical Engineering, Laboratory of Information Technology.

International Journal Papers

1999
  1. Timo I. Laakso and Vesa Välimäki, "Energy-based effective length of the impulse response of a recursive filter", IEEE Trans. on Instrumentation and Measurement, Vol. 48, No. 1, pp. 7-17, Feb. 1999.
1998
  1. T. I. Laakso and A. Gyasi-Agyei, "Design of optimal symmetric FIR receive filters", Electronic Letters, Vol. 34, No. 25, pp. 2375-2377, 10th Dec. 1998.
  2. Vesa Välimäki and Timo I. Laakso, "Suppression of transients in variable recursive digital filters with a novel and efficient transient cancellation method", IEEE Trans. on Signal Processing, Vol. 46, No. 12, pp. 3408-3414, Dec. 1998.
  3. Juha Kauraniemi, Timo I. Laakso, Iiro Hartimo, and Seppo J. Ovaska, "Delta operator realizations ofr direct-form IIR filters", IEEE Trans. on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 45, No. 1, pp. 41-52, January 1998.
1997
  1. Seppo J. Ovaska, Olli Vainio, and Timo I. Laakso, "Design of predictive IIR filters via feedback extension of FIR forward predictors," IEEE Trans. on Instrumentation and Measurement, Vol. 46. No. 5, pp. 1196-1201, Oct. 1997.
  2. A. Yardim, T. I. Laakso, L. P. Sabel and G. D. Cain, "Frequency-sampling design of delay-root-Nyquist filters", Electronic Letters, Vol. 33, No. 1, pp. 35-37, 2nd Jan. 1997.
1996
  1. Timo I. Laakso, Lesley P. Sabel, Anush Yardim, and Gerald D. Cain, "Optimal receive filters for the suppression of ISI and adjacent channel interference", Electronic Letters, Vol. 32, No. 15, pp. 1346-1347, 18th July 1996.
  2. I. Kale, J. P. Mackenzie and T. I. Laakso, "Motor car acoustic response modeling and order reduction via balanced model truncation", Electronic Letters, Vol. 32, No. 11, pp. 965-966, 23rd May 1996.
  3. Timo I. Laakso and Seppo J. Ovaska, "A prefiltering approach for optimal polynomial prediction," IEEE Trans. on Signal Processing, Vol. 44, No. 1, pp. 701-705, March 1996.
  4. P. T. Harju, T. I. Laakso, and S. J. Ovaska, "Applying IIR predictors on Rayleigh fading signal," Signal Processing, Vol. 48, No. 1, pp. 91-96, Jan. 1996.
  5. Timo I. Laakso, Vesa Välimäki, Matti Karjalainen and Unto K. Laine, "Splitting the unit delay - tools for fractional delay filter design," IEEE Signal Processing Magazine, Vol. 13, No. 1, pp. 30-60, Jan. 1996.
1995
  1. Jari P. Ranta, Seppo J. Ovaska, and Timo I. Laakso, "Adaptive polynomial predictor for velocity filtering,", Applied Signal Processing, Vol. 2 No. 1, pp. 94-106, 1994 [published Autumn 1995!].
  2. P. T. Harju and T. I. Laakso, "Polynomial predictors for complex-valued vector signals," Electronics Letters, Vol. 31, No. 19, pp. 1650-1652, 14th Sept. 1995.
  3. Jukka A. Honkanen, Timo I. Laakso, Seppo J. Ovaska, and Iiro O. Hartimo, "Lowpass IIR predictors for discrete-time signal processing," Digital Signal Processing - A Review Journal, Vol. 5, No. 3, pp. 133-139, July 1995.
1994
  1. Truong Q. Nguyen, Timo I. Laakso, and R. David Koilpillai, "Eigenfilter approach for the design of allpass filters approximating a given phase response," IEEE Trans. on Signal Processing, Vol. 42, No. 9, pp. 2257-2263, Sept. 1994.
  2. Timo I. Laakso, Jari Ranta, and Seppo J. Ovaska, "Design and implementation of efficient IIR notch filters with quantization error feedback," IEEE Trans. on Instrumentation and Measurement, Vol. 43. No. 3, pp. 449-456, June 1994.
  3. Timo I. Laakso and Leland B. Jackson, "Bounds for floating-point roundoff noise," IEEE Trans. on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 41 No. 3, pp. 424-427, June 1994.
  4. T. Laakso, B. Zeng, I. Hartimo, and Y. Neuvo, "Elimination of limit cycles in floating-point implementations of direct-form recursive digital filters," IEEE Trans. on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 41 No. 3, pp. 308-313, April 1994.
  5. Markus Lang and Timo I. Laakso, "Simple and robust method for design of allpass filters using least-squares error criterion," IEEE Trans. on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 41 No. 1, pp. 40-48, Jan. 1994.
1993
  1. Timo I. Laakso, Seppo J. Ovaska, and Olli Vainio, "Implementation of a time-varying MIMO system with error feedback," Signal Processing, Vol. 33 No. 1, pp. 81-93, July 1993.
  2. Timo I. Laakso, "Elimination of limit cycles in recursive digital filters using error feedback," International Journal of Circuit Theory and Applications, Vol. 21, pp. 141-163, March-April 1993.
1992
  1. R. Boite, T. Laakso, Y. Neuvo, and B. Zeng, "Correction to "Analysis of floating point roundoff errors using dummy multiplier coefficient sensitivities"," IEEE Trans. on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 39, No. 10, p. 758, Oct. 1992.
  2. Timo I. Laakso, Paulo S. R. Diniz, Iiro Hartimo, and Trajano C. Macedo, Jr. "Elimination of zero-input and constant-input limit cycles in single-quantizer recursive filter structures," IEEE Transactions on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 39, No. 9, pp. 638-646, Sept. 1992.
  3. Timo I. Laakso and Iiro O. Hartimo, "Noise reduction in recursive digital filters using high-order error feedback," IEEE Trans. on Signal Processing, Vol. 40, No. 5, pp. 1096-1107, May 1992.
  4. Timo I. Laakso, "Comments on "Comments on 'Calculation of L2 norms for scaling second-order state-space sections'"," IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, Vol. 39, No. 4, p. 256, April 1992.

International Conference Papers

1999
  1. K. Kettunen and T. Laakso, "Iterative multiuser receiver utilizing soft decoding information," in Proc. IEEE Int. Conf. on Communications (ICC'99), pp. xxx-xxx, Vancouver, BC, Canada, June 6-10, 1999.
1998
  1. P. T. Karttunen, K. Kalliola, T. I. Laakso, and P. Vainikainen, "Measurement analysis of spatial and temporal correlation in wideband radio channels with adaptive antenna array", in Proc. IEEE Int. Conf. on Universal Personal Communications (ICUPC'98), pp. 671-675, Florence, Italy, Oct. 5-9, 1998.
  2. J. A. Apolinario Jr., S. Werner, T. I. Laakso, and P. S. R. Diniz, "Constrained normalized adaptive filtering for CDMA mobile communications," in Proc. IX European Signal Processing Conference (EUSIPCO'98), pp. 2053-2056, Island of Rhodes, Greece, Sept. 8-11, 1998.
  3. J. A. Apolinario Jr., P. S. R. Diniz, T. I. Laakso, and M. L. R. de Campos, "Step-size optimization of the BNDR-LMS algorithm," in Proc. IX European Signal Processing Conference (EUSIPCO'98), pp. 1249-1252, Island of Rhodes, Greece, Sept. 8-11, 1998.
  4. R. Baghaie, S. Werner, and T. Laakso, "Relaxed look-ahead techniques for pipelined implementation of adaptive multiple-antenna CDMA mobile receivers," in Proc. IX European Signal Processing Conference (EUSIPCO'98), pp. 877-880, Island of Rhodes, Greece, Sept. 8-11,1998.
  5. Stefan Werner, J. A. Apolinario Jr., and Timo I. Laakso, "Multiple-antenna CDMA mobile reception using constrained normalized adaptive algorithms", in Proc. SBT/IEEE Int. Telecommunications Symposium (ITS'98), pp. 354-358, Sao Paulo, Brazil, Aug. 9-13, 1998.
  6. M. L. R. de Campos, S. Werner, J. A. Apolinario., and Timo I. Laakso, "Constrained Quasi-Newton algorithm for CDMA mobile communications", in Proc. SBT/IEEE Int. Telecommunications Symposium (ITS'98), pp. 371-376, Sao Paulo, Brazil, Aug. 9-13, 1998.
  7. R. Baghaie and T. Laakso, "Implementation of low-power CDMA RAKE receivers using strength reduction transformation," in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'98), pp. 169-172, Vigsø, Denmark, June 8-11, 1998.
  8. Stefan Werner, Timo Laakso, and Jorma Lilleberg, "Multiple-antenna receiver for CDMA mobile reception", in Proc. IEEE Int. Conf. on Communications (ICC'98), pp. 1053-1057, Atlanta, Georgia, USA, June 7-11, 1998.
  9. Timo I. Laakso and Vesa Välimäki, "Energy-based effective length of the impulse response of a recursive filter," in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP'98), vol. 3, pp. 1253-1256, Seattle, Washington, May 12-16, 1998.
  10. R. Baghaie, S. Werner, and T. Laakso, "Pipelined implementation of adaptive multiple-antenna CDMA receivers," in Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'98), Seattle, Washington, vol. 6, pp. 3229-3232, May 12-16, 1998.
  11. Vesa Välimäki and Timo I. Laakso, "Suppression of transients in time-varying recursive filters for audio signals," in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP'98), vol. 6, pp. 3569-3572, Seattle, Washington, May 12-16, 1998.
1997
  1. Petri T. Karttunen, T. I. Laakso and J. Lilleberg, "Tracking of mobile users in mobile communication system using adaptive convergence parameter", in Proc. 8th IEEE Int. Symp. on Personal, Indoor and Mobile Radio Communications (PIMRC'97), pp. 989-993, Helsinki, Finland, Sept. 1-4, 1997.
  2. J. Kauraniemi and T. I. Laakso, "Roundoff noise analysis of modified delta operator direct form structures", in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'97), Vol. 4, pp. 2365-2368, Hong Kong, June 1997.
1996
  1. J. Kauraniemi and T. I. Laakso, "Elimination of limit cycles in a direct form delta operator filter", in Proc. VIII European Signal Processing Conference (EUSIPCO'96), Vol. 1, pp. 57-60, Trieste, Italy, Sept. 1996.
  2. Anush Yardim, Timo I. Laakso, Lesley P. Sabel, and Gerald D. Cain, "Design of efficient receive FIR filters for joint minimization of channel noise, ISI, and adjacent channel interference," in Proc. IEEE Global Communications Conference (GLOBECOM'96), pp. 948-952, London, UK, Nov. 18-22, 1996.
  3. Aiping Huang, Timo I. Laakso, Seppo J. Ovaska, and Iiro O. Hartimo, "Optimal linear filtering for power estimation of slowly-varying complex-valued signals", in Proc. IEEE Int. Conf. on Signal Processing (ICSP'96), pp. 76-79, Beijing, China, Oct. 14-18, 1996
  4. Denise Bland, Timo Laakso and Andrzej Tarczynski, "Application of NUT-DFT for resampling of nonuniformly sampled signals", in Proc. the Third Int. Conf. on Electronics, Circuits, and Systems (ICECS'96), pp. 586-589, Rhodos, Greece, Oct. 13-16, 1996.
  5. Timo I. Laakso, N. Paul Murphy and Andrzej Tarczynski, "Reconstruction of nonuniformly sampled signals using polynomial filtering", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 61-64, Espoo, Finland, Sept. 24-27, 1996.
  6. Aiping Huang and Timo I. Laakso, "Power estimation approaches for complex-valued signals based on the Hammerstein model and the Wiener model", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 191-194, Espoo, Finland, Sept. 24-27, 1996.
  7. Petri T. Karttunen, Seppo J. Ovaska, and Timo I. Laakso, "Comparison of direction of arrival estimation methods: a case study", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 223-227, Espoo, Finland, Sept. 24-27, 1996.
  8. Denise M. Bland, Andrzej Tarczynski and Timo I. Laakso, "Spectrum analysis of nonuniformly sampled signals using the NUT-DFT", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 307-310, Espoo, Finland, Sept. 24-27, 1996.
  9. N. P. Murphy, A. Tarczynski and T. I. Laakso, "Sampling-rate conversion using a wideband tuneable fractional delay element", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 423-426, Espoo, Finland, Sept. 24-27, 1996.
  10. Izzet Kale, Jonathan P. Mackenzie, Timo I. Laakso and Gerald D. Cain, "Recursive filter approximation of long car audio impulse responses using balanced model truncation", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 435-438, Espoo, Finland, Sept. 24-27, 1996.
  11. Jonathan P. Mackenzie, Izzet Kale, Timo I. Laakso and Gerald D. Cain, "Balanced model truncation: an alternative to linear prediction for speech coding", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 439-442, Espoo, Finland, Sept. 24-27, 1996.
  12. Vesa Välimäki and Timo I. Laakso, "Splitting the unit delay - digital filter approximations for fractional delay", in Proc. IEEE Nordic Signal Processing Symposium (NORSIG'96), pp. 479-482, Espoo, Finland, Sept. 24-27, 1996.
  13. Lesley P. Sabel, Timo I. Laakso, Anush Yardim, and Gerald D. Cain, "A new delay root-Nyquist filter design method for signals corrupted by ACI," in Proc. 4th UK/Australian International Symposium on DSP for Communication Systems, Perth, Western Australia, pp. 186-193, Sept. 23-27, 1996.
  14. Aiping Huang and Timo I. Laakso, "Optimal design and adaptive implementation of power estimation using the Hammerstein model", in Proc. IEEE Midwest Symposium on Circuits and Systems, pp. 648-651, Ames, Iowa, USA, Aug. 18-21, 1996.
  15. Andrzej Tarczynski, Denise Bland, and Timo Laakso, "Spectrum estimation of non-uniformly sampled signals", in Proc. IEEE International Symposium on Industrial Electronics (ISIE96), Warsaw, Poland, pp. 196-200, June 17-20, 1996.
  16. Denise M. Bland, Timo I. Laakso, and Andrzej Tarczynski, "Analysis of algorithms for a non-uniform time discrete Fourier transform," in Proc. Int. Symp. on Circuits and Systems (ISCAS'96), Vol. 2, pp. 453-456, Atlanta, Georgia, May 12-15, 1996.
  17. Juha Kauraniemi, Timo I. Laakso, Iiro Hartimo, and Seppo J. Ovaska, "Roundoff noise minimization in a direct form delta operator structure," in Proc. Int. Conf. on Acoustics, Speech, Signal Process. (ICASSP'96), Vol. 3, pp. 1371-1374, Atlanta, Georgia, May 7-10, 1996.
1995
  1. L. P. Sabel, A. Yardim, G. D. Cain, and T. I. Laakso, "Improved delay root-Nyquist filters for symbol synchronization in PCS receivers," IEEE Global Telecommunications Conference (GLOBECOM'95), pp. 1302-1306, Westin Plaza, Singapore, Nov. 13-17, 1995.
  2. A. Yardim, G. D. Cain, and T. Laakso, "Experiences with nonuniform frequency sampling for FIR digital filter design," in Proc. Workshop on Sampling Theory and Applications (SampTA'95), pp. 189-194, Jurmala (Riga), Latvia, Sept. 19-22, 1995.
  3. N. Paul Murphy, Timo I. Laakso, and Gregory H. Allen, "Fast resampling of nonuniformly sampled signals using interpolative FIR filters," in Proc. Workshop on Sampling Theory and Applications (SampTA'95), pp. 241-246, Jurmala (Riga), Latvia, Sept. 19-22, 1995.
  4. Vesa Välimäki, Timo I. Laakso, and Jonathan Mackenzie, "Elimination of transients in time-varying allpass fractional delay filters with application to digital waveguide modeling," in Proc. International Computer Music Conference (ICMC95), pp. 327-334, Banff, Alberta, Canada, Sept. 3-7, 1995.
  5. Juha Kauraniemi, Timo I. Laakso, Iiro Hartimo, and Seppo J. Ovaska, "Delta operator realizations of recursive digital direct form filters," in Proc. European Conf. on Circuit Theory and Design (ECCTD'95), pp. 667-670, Istanbul, Turkey, 27-31 Aug., 1995.
  6. Timo I. Laakso, Tapio Saramäki, and Gerald D. Cain, "Asymmetric Dolph-Chebyshev, Saramäki, and transitional windows for fractional delay FIR filter design," in Proc. 38th Midwest Symposium on Circuits and Systems, Rio de Janeiro, Brazil, pp. 580-583, Aug. 13-16, 1995.
  7. Aiping Huang, Timo I. Laakso, Seppo J. Ovaska, and Iiro O. Hartimo, "Predictive power estimation of complex-valued signals," in Proc. 38th Midwest Symposium on Circuits and Systems, Rio de Janeiro, Brazil, pp. 953-956, Aug. 13-16, 1995.
  8. Seppo J. Ovaska, Olli Vainio, and Timo I. Laakso, "Design of predictive IIR filters via feedback extension of FIR forward predictors," in Proc. 38th Midwest Symposium on Circuits and Systems, Rio de Janeiro, Brazil, pp. 370-375, Aug. 13-16, 1995.
  9. Jarno M. A. Tanskanen, Aiping Huang, Timo I. Laakso, and Seppo J., Ovaska, "Prediction of received signal power in CDMA cellular systems," in Proc. 45th IEEE Vehicular Technology Conference, Rosemont, Illinois, pp. 922-926, July 26-28, 1995.
  10. Timo I. Laakso, Vesa Välimäki, and Jukka Henriksson, "Tunable downsampling using fractional delay filters with applications to digital TV transmission," in Proc. IEEE Int. Conf. on Acoustics, Speech, Signal Process. (ICASSP'95), pp. 1304-1307, Detroit, Michigan, May 8-12, 1995.
  11. L. P. Sabel, A. Yardim, G. D. Cain, and T. I. Laakso, "Effects of root raised-cosine filters in the performance of digital demodulators," in Proc. Internal Conference on Telecommunications, pp. 75-79, Bali, Indonesia, 3-5 April, 1995.
1994
  1. Seppo J. Ovaska, Timo I. Laakso, and Olli Vainio, "Advances in predictive digital filtering," Nordic Signal Processing Symposium (NORSIG'94), pp. 136-141, Ålesund, Norway, June 2-4, 1994.
  2. Truong Q. Nguyen, Timo I. Laakso, and T. Engin Tuncer, "On perfect-reconstruction allpass-based cosine-modulated IIR filter banks," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'94), pp. 33-36, London, Great Britain, 30 May - 2 June, 1994.
  3. Philip E. Luft and Timo I. Laakso, "Adaptive control of the sampling rate using a local time-domain sampling theorem," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'94), pp. 145-148, London, Great Britain, 30 May - 2 June, 1994.
  4. Timo I. Laakso, Markus Lang, and Tapio Saramäki, "Design of limit-cycle-free recursive filters for fixed-point direct-form implementation," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'94), pp. 477-480, London, Great Britain, 30 May - 2 June, 1994.
1993
  1. Vesa Välimäki, Matti Karjalainen, and Timo I. Laakso, "Modeling of woodwind bores with finger holes," in Proc. 1993 Int. Computer Music Conference (ICMC'93), pp. 32-39, Tokyo, Japan, Sept. 10-15, 1993.
  2. Jukka A. Honkanen, Timo I. Laakso, Seppo J. Ovaska, and Iiro Hartimo, "Design of optimal predictors with lowpass characteristics," in Proc. 11th European Conf. on Circuit Theory and Design (ECCTD'93), pp. 515-520, Davos, Switzerland, Aug. 30 - Sept. 3, 1993.
  3. Vesa Välimäki, Matti Karjalainen, and Timo I. Laakso "Fractional delay digital filters," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'93), pp. 355-358, Chicago, Illinois, May 3-6, 1993.
  4. Timo I. Laakso and Seppo J. Ovaska, "Optimal polynomial predictors with application specific fixed prefilters," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'93), pp. 351-354, Chicago, Ill., May 3-6, 1993.
  5. Timo I. Laakso, Truong Q. Nguyen, and R. David Koilpillai, "Designing allpass filters using the eigenfilter method," in Proc. IEEE Int. Conf. on Acoustics, Speech, Signal Process. (ICASSP'93), pp. III-77..80, Minneapolis, Minnesota, April 27-30, 1993.
1992
  1. Jari Ranta, Seppo J. Ovaska, and Timo I. Laakso, "An adaptive polynomial predictor for the feedback velocity prefiltering in elevator control," in Proc. Int. Conf. on Signal Processing Applications & Technology (ICSPAT'92), pp. 583-592, Boston, Massachusetts, Nov. 2-5, 1992.
  2. Vesa Välimäki, Timo I. Laakso, Matti Karjalainen, and Unto K. Laine, "A new computational model for the clarinet," in Proc. Int. Computer Music Conference (ICMC'92), Addendum (pages not numbered), San Jose, California, Oct. 14-18, 1992.
  3. Timo I. Laakso, Vesa Välimäki, Matti Karjalainen, and Unto K. Laine, "Real-time implementation techniques for a continuously variable digital delay in modeling musical instruments," in Proc. Int. Computer Music Conference (ICMC'92), pp. 140-141, San Jose, California, Oct. 14-18, 1992.
  4. Timo I. Laakso and Iiro Hartimo, "How to determine the internal wordlength in floating-point implementations of recursive filter?," in Proc. European Signal Processing Conference (EUSIPCO'92), pp. 251-254, Brussels, Belgium, Aug. 24-27, 1992.
  5. Markus Lang and Timo I. Laakso, "Design of allpass filters for phase approximation and equalization using LSEE error criterion," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'92), pp. 2417-2420, San Diego, California, May 10-13, 1992.
  6. Timo I. Laakso and Bing Zeng, "Limit cycles in floating-point implementations of recursive filters - a review," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'92), pp. 1816-1819, San Diego, California, May 10-13, 1992.
  7. L. Wang, I. Hartimo, and T. Laakso, "A novel double-decomposition method for systolic implementation of DFT," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'92), pp. 1085-1088, San Diego, California, May 10-13, 1992.
1991
  1. J. Ranta, E. Aalto, T. Laakso, and I. Hartimo, "Bioelectronic analyser for raw water monitoring," in Proc. Int. Conf. on DSP Applications and Technology (ICSPAT'91), pp. 582-589, Berlin, Germany, Oct. 28-31, 1991.
  2. Matti Karjalainen, Unto K. Laine, Timo Laakso and Vesa Välimäki, "Transmission-line modeling and real-time synthesis of string and wind instruments," in Proc. International Computer Music Conference (ICMC'91), pp. 293-296, Montreal, Oct. 16-20, 1991.
  3. P. Pitkänen, J. Skyttä, and T. Laakso, "Comparison of digital filter architectures using VHDL," in Proc. 2nd European Conference on VHDL methods (EURO-VHDL'91), pp. 172-175, Stockholm, Sweden, Sept. 8-11, 1991.
  4. Bing Zeng, Timo Laakso, Iiro Hartimo, and Yrjö Neuvo, "Error feedback for floating-point recursive digital filters," in Proc. 10th European Conf. on Circuit Theory and Design (ECCTD'91), pp. 159-168, Copenhagen, Denmark, September 2-6, 1991.
  5. T. C. Macedo Jr., T. Laakso, P. S. R. Diniz, and I. Hartimo, "Reformulation of Chang's criterion for the absence of limit cycles using bilinear transform," in Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS'91), pp. 388-391, Westin Plaza, Singapore, June 11-14, 1991.
  6. Bing Zeng, Timo Laakso, Iiro Hartimo, and Yrjö Neuvo, "Error feedback for floating-point cascade-form digital filters," in Proc. IEEE Int. Conf. on Acoustics, Speech, Signal Process. (ICASSP'91), pp. 1925-1928, Toronto, Canada, May 14-17, 1991.
  7. T. Laakso, P. S. R. Diniz, and I. Hartimo, "General criterion for the absence of limit cycles in filter structures with a single quantizer," in Proc. IEEE Int. Conf. on Acoustics, Speech, Signal Process. (ICASSP'91), pp. 1885-1888, Toronto, Canada, May 14-17, 1991.
1990
  1. T. Laakso, B. Zeng, I. Hartimo, and Y. Neuvo, "Elimination of limit cycles in floating-point recursive digital filters with error feedback," in Proc. 33rd Midwest Symposium on Circuits and Systems, pp. 833-836, Calgary, Canada, Aug. 12-15, 1990.
  2. T. Laakso, B. Zeng, I. Hartimo, and Y. Neuvo, "Reduction of floating-point roundoff noise in recursive digital filters with error feedback," in Proc. IEEE International Conference on Systems Engineering, pp. 244-247, Pittsburgh, Pennsylvania, Aug. 9-11, 1990.
  3. T. Laakso, "Elimination of limit cycles in recursive digital filters using error feedback," in Proc. Bilkent International Conference on New Trends in Communication, Control, and Signal Processing (BILCON'90), pp. 1073-1079, Ankara, Turkey, July 2-5, 1990.
  4. Jouko Koski and Timo Laakso, "Efficient numerical evaluation of the total square integral: a survey and a comparison," in Proc. IASTED Int. Conf. on Signal Processing and Digital Filtering, pp. 260-262, Lugano, Switzerland, June 18-21, 1990.
  5. Timo I. Laakso, "Suppression of overflow oscillations in recursive digital filters using error feedback," in Proc. IASTED Int. Conf. on Signal Processing and Digital Filtering, pp. 76-80, Lugano, Switzerland, June 18-21, 1990.
1989
  1. Timo Laakso and Iiro Hartimo, "Efficient implementation of high-order error feedback," in Proc. Int. Conf. on Circuits and Systems (ICCAS'89), pp. 375-378, Nanjing, China, July 6-8, 1989.
  2. Timo Laakso and Iiro Hartimo, "Determining the optimal coefficients of high-order error feedback," in Proc. Int. Symp. on Circuits and Systems (ISCAS'89), pp. 728-731, Portland, Oregon, USA, May 8-11, 1989.
1988
  1. Timo Laakso and Iiro Hartimo, "Direct form revisited: recursive filter implementation using high-order direct form sections," in Proc. Int. Symp. on Circuits and Systems (ISCAS'88), pp. 791-796, Espoo, Finland June 7-9, 1988.
1987
  1. T. Laakso, O. Hyvärinen, and M. Renfors, "Signal processor implementation of some recursive digital filter structures," in Proc. Int. Conf. on Digital Signal Processing, pp. 220-224, Florence, Italy, Sept. 7-10, 1987.

Other

1997
  1. Stefan Werner, Timo I. Laakso and Jorma Lilleberg, "Adaptive multiple-antenna receiver for CDMA mobile reception", in Proc. of the IRC Workshop'97, pp. 59-60, Innopoli, Espoo, Finland, Oct. 17, 1997.
  2. Petri T. Karttunen, Timo I. Laakso and Jorma Lilleberg, "Beamforming baseduser tracking", in Proc. of the IRC Workshop'97, pp. 57-58, Innopoli, Espoo, Finland, Oct. 17, 1997.
  3. Petri T. Karttunen, Timo I. Laakso and Jorma Lilleberg, "Adaptive step size method for user tracking in mobile communication system", in Proc. 1997 Finnish Signal Processing Symposium (FINSIG'97), pp. 6-10, Pori, Finland, May 22, 1997.
1996
  1. Petri T. Karttunen, Timo I. Laakso, and Seppo J. Ovaska, "Adaptive beamforming for mobile communications", in Proc. URSI/IEEE/IRC XXI Convention on Radio Science, pp. 153-154, Otaniemi, Espoo, Finland, Oct. 2-3, 1996.
1995
  1. V. Välimäki, T. I. Laakso, and J. Mackenzie, "Time-varying fractional delay filters," in Proc. 1995 Finnish Signal Processing Symposium (FINSIG'95), pp. 118-122, Espoo, Finland, June 2, 1995.
  2. J. Kauraniemi, T. I. Laakso, I. Hartimo, and S. J. Ovaska, "Delta operator realized digital filters," in Proc. 1995 Finnish Signal Processing Symposium (FINSIG'95), pp. 113-117, Espoo, Finland, June 2, 1995.
  3. A. Huang, T. I. Laakso, S. J. Ovaska, and I. O. Hartimo, "On schemes for power prediction of complex-valued signals," in Proc. 1995 Finnish Signal Processing Symposium (FINSIG'95), pp. 55-58, Espoo, Finland, June 2, 1995.
  4. J. M. A. Tanskanen, A. Huang, T. I. Laakso, and S. J. Ovaska, "Polynomial prediction of noise shaping Rayleigh fading," in Proc. 1995 Finnish Signal Processing Symposium (FINSIG'95), pp. 26-29, Espoo, Finland, June 2, 1995.
  5. Seppo J. Ovaska, Olli Vainio, and Timo I. Laakso, "Recursive extension of FIR forward predictors," Research report No. 53, 9 p., Lappeenranta Univ. of Technology, Dept. of Information Technology, January 1995.
1994
  1. Timo I. Laakso, Vesa Välimäki, Matti Karjalainen and Unto K. Laine, "Crushing the delay - tools for fractional delay design," Report 35, 63 p., Helsinki Univ. of Technology, Faculty of Electrical Engineering, Laboratory of Acoustics and Audio Signal Processing, Otaniemi, October 1994.
1993
  1. Ari Hottinen and Timo Laakso, "Simulation of interference cancellation techniques for CDMA reception," in Proc. XIX URSI National Convention on Radio Science, p. 25, Otaniemi, Espoo, Oct. 25-26, 1993.
  2. Seppo J. Ovaska, Timo I. Laakso, and Olli Vainio, "Discrete-time polynomial predictors: a review," Research report No. 41, 38 p., Lappeenranta Univ. of Technology, Dept. of Information Technology, July 1993.
1991
  1. L. Wang, I. Hartimo, and T. Laakso, "A novel double-decomposition method for systolic implementation of DFT," ASAP'91, Costa Brava, Spain, Sept. 1991 (no proceedings; copies of the paper handed out in the conference).
  2. Timo I. Laakso, "Elimination of limit cycles in direct form digital filters using error feedback," Report 8, Helsinki University of Technology, Laboratory of Signal Processing and Computer Technology, 35 p., Aug. 1991.
  3. Pekka Pitkänen, Jorma Skyttä, and Timo Laakso, "Comparison of digital filter architectures using VHDL," Report 7, Helsinki University of Technology, Laboratory of Signal Processing and Computer Technology, 18 p., June 1991.
1990
  1. Timo Laakso, Bing Zeng, Iiro Hartimo, and Yrjö Neuvo, "Analysis of floating-point roundoff errors in recursive digital filters," in Proc. URSI XVI Convention on Radio Science, p. D2/3, Kuopio, Finland, November 5-6, 1990.
1989
  1. Timo I. Laakso and Iiro Hartimo, "Error feedback: an efficient method for noise reduction and limit cycle elimination in recursive digital filters," in Proc. URSI/IEEE XV Convention on Radio Science, p. D1/4, Tampere, Finland, November 20-21, 1989.
1987
  1. Timo Laakso, "Signal processor implementation of some digital filter structures," Report A3, Helsinki University of Technology, Laboratory of Information Technology, 26 p., April 1987.
1986
  1. Timo Laakso, "A comparison of some digital filter structures realized with TMS 32010 signal processor," in Proc. URSI XII National Convention on Radio Science, p. B1.3, Otaniemi, Finland, Oct. 31, 1986.
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