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R. Baghaie and P. Karttunen, "Implementation of mobile user tracking system," to appear in Proceedings Global Communications Conference, GLOBECOM'99, Rio de Janeiro, Brazil, December 1999. |
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V. Dimitrov and R. Baghaie, "Computing discrete Hartley transform using algebraic integers," to appear in Proceedings 33rd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, October 1999. |
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P. Karttunen, "An
algorithm for Noise Subspace based Mobile User Tracking," in Proceedings
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,
PIMRC'99, Kyoto, Japan, September 1999.
ABSTRACT:
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R. Baghaie, "Application
of transformation techniques in CDMA receivers," in Proceedings
IEEE Midwest Symposium on Circuits and Systems, MWSCAS'99, Las Cruces,
New Mexico, August 1999.
ABSTRACT:
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R. Baghaie and P. Karttunen, "VLSI
implementation of CG based mobile user tracking system," in Proceedings
IEEE Midwest Symposium on Circuits and Systems, MWSCAS'99, Las Cruces,
New Mexico, August 1999.
ABSTRACT:
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K. Kettunen, T. Laakso, "Iterative
multiuser receiver utilizing soft decoding information," in Proceedings
IEEE International Communications Conference, ICC'99, Vancouver, BC,
Canada, pp. 942-946, June 1999.
ABSTRACT:
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P. Karttunen and R. Baghaie, "Conjugate
Gradient Based Signal Subspace Mobile User Tracking," in Proceedings
IEEE Vehicular Technology Conference, VTC'99, Houston, Texas, USA,
vol. 2, pp. 1172-1176, May 1999.
ABSTRACT:
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K. Kettunen, "Iterative
multiuser receiver/decoders with enhanced variance estimation," in
Proceedings
IEEE 49th Vehicular Technology Conference, VTC'99, Houston, Texas,
USA, pp. 2318-2322, May 1999.
ABSTRACT:
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S. Werner, J. Lilleberg, "Downlink
channel decorrelation in CDMA systems with long codes," in Proceedings
IEEE 49th Vehicular Technology Conference, VTC'99, Houston, Texas,
USA, pp. ??-??, May 1999.
ABSTRACT:
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R. Baghaie, "Systolic
implementation of sample-by-sample conjugate gradient algorithm," in
Proceedings
IEEE Finnish Signal Processing Symposium, FINSIG'99, Oulu, Finland,
pp. 252-256, May 1999.
ABSTRACT:
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R. Insa Hernandez, R. Baghaie, and K. Kettunen, "Implementation
of Gram-Schmidt conjugate direction and conjugate gradient algorithms,"
in Proceedings IEEE Finnish Signal Processing Symposium, FINSIG'99,
Oulu, Finland, pp. 165-169, May 1999.
ABSTRACT:
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K. Kettunen, "Iterative
multiuser receivers in coded CDMA systems," in Proceedings
IEEE Finnish Signal Processing Symposium, FINSIG'99, Oulu, Finland,
pp. 15-19, May 1999.
ABSTRACT:
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R. Baghaie, "Transformation techniques in CDMA receivers," in Proceedings IEEE Finnish Signal Processing Symposium, FINSIG'99, Oulu, Finland, pp. 10-15, May 1999. |
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M. L. R. de Campos, S. Werner, J. A. Apolinario, "Householder-transform constrained LMS algorithm with reduced-rank updating," in proceedings Acoustics, Speech, and Signal Processing, ICASSP'99, Phoenix, Arizona, USA, Vol. 4, pp. 1857-1860, March 15-19, 1999. |
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R. Baghaie and V. Dimitrov, "DHT algorithm based on encoding algebraic integers," IEE Electronics
Letters, vol. 35, no. 16, pp. 1303-1305, August 1999.
ABSTRACT:
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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.
ABSTRACT:
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16 | 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 Proceedings International Conference
on Universal Personal Communications, ICUPC'98, Florence, Italy, pp.
671-675, October 1998.
ABSTRACT:
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15 | J. A. Apolinario Jr., S. Werner, T. I. Laakso, and P. S. R. Diniz,
"Constrained
normalized adaptive filtering for CDMA mobile communications," in Proceedings
IX European Signal Processing Conference EUSIPCO'98, Island of Rhodes,
Greece, pp. 2053-2056, September 8-11, 1998.
ABSTRACT:
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14 | 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 Proceedings IX European
Signal Processing Conference EUSIPCO'98, Island of Rhodes, Greece,
pp. 1249-1252, September 8-11, 1998.
ABSTRACT:
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R. Baghaie, S. Werner, and T. Laakso, "Relaxed look-ahead techniques for pipelined implementation of adaptive multiple-antenna CDMA mobile receivers," in Proceedings IX European Signal Processing Conference EUSIPCO'98, Island of Rhodes,Greece, pp. 877-880, September 1998.ABSTRACT:In this paper, Relaxed Look-Ahead technique for pipelined implementation of an adaptive Direct-Sequence Code Division Multiple Access receiver is proposed when multiple antennas are utilized for mobile communications. Adaptive multiple-antenna receivers can provide insensitivity to the interfering powers. They also provide room for more users or require smaller number of antennas than the matched filter solution. A number of approximation techniques are utilized to pipeline the adaptive algorithm used for the proposed multiple-antenna receiver. The resulting pipelined receiver achieves a higher throughput or requires lower power as compared to the receiver using the serial algorithm. With the aid of simulations, for different levels of pipelining and different number of antennas, the signal-to-interference ratio and the bit error rate versus the relative interfering power are illustrated. |
12 | M. L. R. de Campos, S. Werner, J. A. Apolinario., and Timo I. Laakso,
"Constrained Quasi-Newton algorithm for CDMA mobile communications," in
Proceedings
SBT/IEEE International Telecommunications Symposium ITS'98, Sao Paulo,
Brazil, pp. 371-376, August 9-13, 1998.
ABSTRACT:
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S. Werner, J. A. Apolinário, "Multiple-Antenna
CDMA Mobile Reception Using Constrained Normalized Adaptive Algorithms,"
in
Proceedings SBT/IEEE International Telecommunications Symposium ITS'98,
Sao Paulo, Brazil, pp. 354-358, August 9-13, 1998.
ABSTRACT:
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S. Werner, T. Laakso, J. Lilleberg, "Multiple-antenna
receiver for CDMA mobile reception," in Proceedings
IEEE International Conference on Communications ICC'98, Atlanta, Georgia,
USA, June 7-11, 1998.
ABSTRACT:
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R. Baghaie and T. Laakso, "Implementation of low-power CDMA RAKE receivers using strength reduction transformation," in Proceedings IEEE Nordic Signal Processing Symposium, NORSIG'98, Vigsø, Denmark, pp. 169-172, June 1998.ABSTRACT:In a Code Division Multiple Access system operating in a multipath fading channel, a bank of RAKE receivers is needed for each active user at the base station. In this paper, low-power RAKE receivers are proposed that utilize the Strength Reduction (SR) transformation technique. The SR transformation can result in remarkable savings in consumed power and silicon area. A possible disadvantage of the SR transformation is that it increases the computation time of the critical path. However, this problem can be alleviated by different pipelining schemes. |
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R. Baghaie and S. Werner, "Pipelined
adaptive CDMA mobile receivers," in Proceedings IEEE Nordic Signal
Processing Symposium, NORSIG'98, Vigsø, Denmark, pp. 69-72,
June 1998.
ABSTRACT:
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7 | S. Werner, J. A. Apolinário, "Application of Constrained
Normalized Algorithms for a Multiple-Antenna CDMA Mobile Receiver," in
Proceedings
IEEE Nordic Signal Processing Symposium NORSIG'98, Vigsø, Denmark,
June 1998.
ABSTRACT:
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R. Baghaie, S. Werner, and T. Laakso, "Pipelined implementation
of adaptive multiple-antenna CDMA receivers," in Proceedings IEEE
International Conference on Acoustics, Speech, and Signal Processing, ICASSP'98,
Seattle, Washington, vol. 6, pp. 3229-3232, May 1998.
ABSTRACT:
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5 | Timo I. Laakso and Vesa Välimäki, "Energy-based
effective length of the impulse response of a recursive filter," in
Proceedings
IEEE Int. Conf. Acoustics, Speech, and Signal Processing, ICASSP'98,
vol. 3, pp. 1253-1256, Seattle, Washington, May 12-16, 1998.
ABSTRACT:
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4 | Vesa Välimäki and Timo I. Laakso, "Suppression
of transients in time-varying recursive filters for audio signals,"
in
Proceedings IEEE Int. Conf. Acoustics, Speech, and Signal Processing,
ICASSP'98,
vol. 6, pp. 3569-3572, Seattle, Washington, May 12-16, 1998.
ABSTRACT:
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3 | 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 digital filters with a novel and efficient transient
cancellation method," IEEE Trans. on Signal Processing, Vol. 46, No.
12, pp. 3408-3414, Dec. 1998.
ABSTRACT:
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1 | 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. |
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7 | 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. |
6 | 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. |
5 | 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. |
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4 | P. T. Karttunen, T. I. Laakso and J. Lilleberg, "Tracking
of Mobile Users in Mobile Communication System Using Adaptive Convergence
parameter", in Proceedings IEEE International Symposium on Personal,
Indoor and Mobile Radio Communications, PIMRC'97, Vol. 3, pp. 989-993,
Helsinki, Sept. 1-4, 1997.
ABSTRACT:
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3 | 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. |
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2 | P. Karttunen, Comparison of Direction of Arrival and Beamforming Methods, Master's thesis, Laboratory of Telecommunications Technology, TKK, Otaniemi, Jan. 1997. |
1 | Stefan Werner, Adaptive Multiple-Antenna Receiver for CDMA Mobile Reception, Internal Report, Laboratory of Telecommunications Technology, TKK, Otaniemi, October 1997. |
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22 | 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. |
21 | 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. |
20 | 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. |
19 | 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. |
18 | 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. |
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17 | 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. |
16 | 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. |
15 | 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. |
14 | 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. |
13 | 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. |
12 | 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. |
11 | 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. |
10 | 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. |
8 | 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. |
7 | 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. |
6 | 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. |
5 | 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. |
4 | 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. |
3 | 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. |
2 | 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. |
1 | 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. |
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