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Ultra-wideband (UWB) communication systems occupy huge bandwidths with very low power spectral densities. This feature makes the UWB channels highly rich in resolvable multipaths. To exploit the temporal diversity, the receiver is commonly implemented through a Rake. The aim to capture enough signal energy to maintain an acceptable output signal-to-noise ratio (SNR) dictates a very complicated Rake structure with a large number of fingers. Channel shortening or time domain equalizer (TEQ) can simplify the Rake receiver design by reducing the number of significant taps in the effective channel. In this paper, we first derive the bit error rate (BER) of a multiuser and multipath UWB system in the presence of a TEQ at the receiver front end. This BER is then written in a form suitable for traditional optimization. We then present a TEQ design which minimizes the BER of the system to perform efficient channel shortening. The performance of the proposed algorithm is compared with some generic TEQ designs and other Rake structures in UWB channels. It is shown that the proposed algorithm maintains a lower BER along with efficiently shortening the channel.
Magee FR Jr.: A comparison of compromise Viterbi algorithm and standard eqaulization techniques over band limited channels. IEEE Transactions on Communications 1975, 23(3):361-367. 10.1109/TCOM.1975.1092802 CrossRef
Miyajima T, Ding Z: Second-order statistical approaches to channel shortening in multicarrier systems. IEEE Transactions on Signal Processing 2004, 52(11):3253-3264. 10.1109/TSP.2004.836537 CrossRef
Melsa PJW, Younce RC, Rohrs CE: Impulse response shortening for DMT transceivers. IEEE Transactions on Communications 1996, 44(12):1662-1672. 10.1109/26.545896 CrossRef
Yin C, Yue G: Optimal impulse response shortening for discrete multitone transceivers. Electronics Letters 1998, 34(1):35-36. 10.1049/el:19980011 CrossRef
Martin RK, Balakrishnan J, Sethares WA, Johnson CR Jr.: A blind adaptive TEQ for multicarrier systems. IEEE Signal Processing Letters 2002, 9(11):341-343. 10.1109/LSP.2002.804423 CrossRef
Medvedev I, Tarokh V: A channel-shortening multiuser detector for DS-CDMA systems. Proceeding of the 53rd IEEE Vehicular Technology Conference (VTC '01), May 2001, Rhodes, Greece 3: 1834-1838. CrossRef
Rajeswaran A, Somayazulu VS, Foerster JR: Rake performance for a pulse based UWB system in a realistic UWB indoor channel. Proceedings of the IEEE International Conference on Communications (ICC '03), May 2003, Anchorage, Alaska, USA 4: 2879-2883.
Husain SI, Choi J: Single correlator based UWB receiver implementation through channel shortening equalizer. Proceedings of the 11th Asia-Pacific Conference on Communications (APCC '05), October 2005, Perth, Wash, USA 610-614.
Husain SI, Choi J: Blind adaptive channel shortening by unconstrained optimization for simplified UWB receiver design. Proceedings of the 3rd International Symposium on Wireless Communication Systems (ISWCS '06), September 2006, Valencia, Spain 443-446.
Husain SI, Yuan J, Zhang J: Modified channel shortening receiver based on MSSNR algorithm for UWB channels. Electronics Letters 2007, 43(9):535-537. 10.1049/el:20070584 CrossRef
Husain SI, Yuan J, Zhang J: Rake performance after channel shortening by decay factor optimization in UWB channels. Proceeding of the 66th IEEE Vehicular Technology Conference (VTC '07), October 2007, Baltimore, Md, USA 1204-1207.
Foerster JR, et al.: Channel modelling sub-committee report final. Working Group for Wireless Personal Area Networks, Monterey, Calif, USA; February 2003.
Saleh AAM, Valenzuela R: A statistical model for indoor multipath propagation. IEEE Journal on Selected Areas in Communications 1987, 5(2):128-137. CrossRef
Golub GH, Van Loan CF: Matrix Computations. The Johns Hopkins University Press, Baltimore, Md, USA; 1996. MATH
Watkins DS: Fundamentals of Matrix Computations. John Wiley & Sons, New York, NY, USA; 1991. MATH
Gezici S, Chiang M, Poor HV, Kobayashi H: Optimal and suboptimal finger selection algorithms for MMSE rake receivers in impulse radio ultra-wideband systems. EURASIP Journal on Wireless Communications and Networking 2006, 2006:-10.
Martin RK, Vanbleu K, Ding M, et al.: Implementation complexity and communication performance tradeoffs in discrete multitone modulation equalizers. IEEE Transactions on Signal Processing 2006, 54(8):3216-3230. CrossRef
- Time Domain Equalizer Design Using Bit Error Rate Minimization for UWB Systems
Syed Imtiaz Husain
R. K. Martin
- Springer International Publishing
EURASIP Journal on Wireless Communications and Networking
Elektronische ISSN: 1687-1499
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