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Adaptive Antennas with Timing Recovery for Multiuser DS/CDMA Communication Systems
|關鍵字:||DS-CDMA;直序展碼分碼多工擷取;LMS;smart atenna;最小平方差;智慧型天線||出版社:||電機工程學系所||引用:|| J. Proakis, Digital Communication, New York: McGraw Hill, 1995.  A. J. Viterbi, Principles of Spread Spectrum Communications. New York: Addison-Wesley, 1995.  S. Tanaka, A. Harada, M. Sawahashi, and F. Adachi, "Experiments on Coherent Adaptive Antenna Array Diversity for Wideband DS-CDMA Mobile Radio," IEEE JSAC, vol. 18, No. 8, pp.1495-1504,August 2000.  A. Paulraj and C. Papadias, "Space-Time Processing for Wireless communications," IEEE Signal Processing Magazine, vol. 14, No.6, pp. 49-83, Nov. 1997.  R. T. Compton Jr., "An adaptive antenna in a spread-spectrum communication system," Proc. IEEE, vol. 66, pp. 289-295, March 1978.  S. C. Swales, M. A. Beach, D. J. Edwards, and J. P. McGeehan, "The performance enhancement of multibeam adaptive base-station antennas for cellular land mobile radio systems," IEEE Trans. Veh. Technol., vol.39,pp. 56-67, Feb. 1990.  G. V. Tsoulos, M. A. Beach, and S. C. Swales, "Performance enhancement of DS-CDMA microcellular networks with adaptive antennas," in Proc. 46th IEEE Veh. Technol. Conf., Atlanta, U.S.A., April 28-May 1 1996, pp. 1086-1090.  H. Wang, R. Kohno, and H. Imai, "Adaptive array antenna combined with tapped delay line using processing gain for direct-sequence/spread-spectrum multiple access system, "IEICE Trans commun., vol.J75-B-II, pp. 815-825, Nov. 1992.  Y. Wang and J. R. Cruz, "Adaptive antenna arrays for the reverse link of CDMA cellular communication systems, "Electron. Lett., vol. 30, pp.1017-1018, June 1994.  T. Ohgane, "Spectral efficiency improvement by base station antenna pattern control for mobile cellular systems," IEICE Trans. Commun., vol. E77-B, pp. 598-605, May 1994.  ArrayComm, "Smart Antenna Systems," http://www.webproforum.com/smar_ant and www.arraycomm.com, May 2000.  R. T. Compton, "Adaptive Antennas: Concepts and Performance," Englewood Cliffs, New Jersey, Prentice-Hall, 1988.  B.Widrow, P. E. Mantey, L. J. Griffiths, and B. B. Goode, "Adaptive antenna systems," Proc. IEEE, vol.55, no.12, pp.2143-2158, Dec. 1967  Y. Ogawa, M. Ohmiya, and K. Itoh, "An LMS adaptive array for multipath fading reduction, "IEEE Trans., Aerosp. And Electron. Syst., vol.AES-23, no.1, pp.17-23, Jan. 1987.  Ricardo. D. Gaudenzi, Marco Luise and Roberto Viola, "A digital chip timing recovery loop for band-limited direct sequence spread-spectrum Signals", IEEE Tr. on Comm., Vol.41, No.11, pp.1760-1769, Nov. 1993.  W. H. Sheen, G. L. Stuber, "Effects of multipath fading on delay-locked Loops for spread spread spectrum systems", IEEE Tr. on Comm., Vol.42, No.2/3/4, pp. 1947-1956, Feb./Mar./April 1994.  F.Adachi, M. Sawahashi, and H. Suda,"Wideband DS-CDMA for next generation mobile communications systems,"IEEE Commun. Mag., vol.36, pp. 56-69, Sept. 1998.  S. Tanaka, A. Harada, M. Sawahashi, and F. Adachi,"Experiments on coherent adaptive antenna array diversity for wideband DS-CDMA mobile radio," IEEE J. Select. Areas Commun., vol. 18, pp. 1495-1504, Aug. 2000.  S. Kim and S. Miller, "Subspace-based Synchronization Using Antenna Array for DS-CDMA Signals in Multipath Time-Varying Fading Channels," IEEE VTC Spring, pp. 547-551, Tokyo, Japan, May 15-18, 2000.  R. K. Madyastha and B. Aazhang, "Synchronization and Detection of Spread Spectrum Signals in Multipath Channels Using Antenna Arrays," IEEE MILCOM, pp. 1170-1174,1995.  TIA, Interim. V. and V. Text. for cdma2000 Physical Layer (Revision 8.3), March16,1999.  Third Generation Partnership Project, "Spreading and Modulation (FDD)," 3GPP Technical Specification, TS25.213, v3.2.0, March 2000.  Yoo S. Song and Hyuck M. Kwon, "PN Code Chip Time Tracking with Smart Antennas," IEEE 54th Fall VTC, Atlantic City, NJ, pp.237-241, October 7-11, 2001.||摘要:||
近來，智慧型天線帶來很多技術專注於改善分碼多工無線通訊系統，這些天線系統主要包含了很多技術企圖抑制接受訊號受到的干擾訊號和增加接收容量。在本論文中，我們使用最小均方誤差(Least mean square)演算法和提出了兩個適應性陣列接收架構使用直序展頻分碼多工(DS-CDMA)伴隨多重路徑衰減通道。此同調接收使用最小均方誤差演算法來完成傳送訊號和時序延遲達到同步效果。本架構使用誤差訊號來更新適應性波束合成器的權重和時序延遲。模擬結果證實此同調接收架構對於時序的回復、錯誤率都有好的效能。
Lately, the smart antenna has brought much attention to its skill to improve the future code-division multiple-access (CDMA) wireless communications systems. These systems of antennas include a lot of techniques that attempt to better the received signal, inhibit all interfering signals, and increase capacity, mainly. In this paper, we use least mean square (LMS) algorithm and propose two adaptive antenna receiver structures for direct sequence code division multiple access (DS-CDMA) multiuser environment with multipath fading channels. The coherent receiver estimate the desired signal and code delay to perform code synchronization by LMS algorithm simultaneously. In the proposed schemes, an "error signal" is used to update the weights of the adaptive beamformer and the estimated code delay. Simulations confirm the good performance, including timing tracking and BER, of the proposed coherent receiver structures.
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