時(shí)變衰落信道中同步時(shí)間擴(kuò)展信號(hào)的分集接收技術(shù)
Diversity Receiving Technique for Synchronous Time Spreading Signal in Time-Varying Fading Channels
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摘要: 擴(kuò)頻通信可以區(qū)分多徑信號(hào)進(jìn)行RAKE分集接收，是一種有效處理多徑效應(yīng)的手段。與此對(duì)應(yīng)，時(shí)間擴(kuò)展通信也可以在頻域上進(jìn)行類(lèi)似RAKE的分集接收，有效處理時(shí)變衰落帶來(lái)的影響。時(shí)間擴(kuò)展會(huì)帶來(lái)嚴(yán)重的符號(hào)間干擾，同步時(shí)間擴(kuò)展可以有效控制和處理符號(hào)間干擾。基于信道分解的分集接收技術(shù)保證了同步時(shí)間擴(kuò)展在時(shí)變衰落信道下的性能。獲得10-4誤碼率，本文分集算法(擴(kuò)展長(zhǎng)度1024)在時(shí)變衰落信道中所需的信噪比與AWGN信道不分集處理所需的信噪比只相差1.4dB。
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關(guān)鍵詞:
- 時(shí)間擴(kuò)展; 時(shí)變衰落信道;信道分解; RAKE接收
Abstract: By Spectrum Spreading, the multi-path signals can be distinguished and received by RAKE receiver, and spectrum spreading is an efficient way to overcome multi-path fading. Time spreading can implement RAKE diversity receiving in frequency domain. But time spreading comes with serious ISI in fading channels. Synchronous time spreading can overcome the ISI. By channel decomposing, the signal can be received by diversity receiver, so good performance can be achieved. To achieve 10-4 BER performance, the SNR required in time-varying fading channels by our algorithm with 1024 bit spreading length is only 1.4dB more than that in AWGN channels without diversity. -
Proakis J. Digital Communications, New York, McGraw Hill, 4th ed., 2001: 822 830, 842-851.[2]Wittneben A. An energy- and bandwidth-efficient data[3]transmission system for time-selective fading channels. in Proc.[4]IEEE GLOBECOM, San Diego, CA., Dec. 1990: 1968-1972.[5]Davies E T J, Linde L P. A novel time spread mechanism to combat flat fading. in COMSIG 97 Proc., Grahamstown, South African, Sept. 1997, 59-62.[6]Swanepoel S A, Linde L P. A time spread technique with interference cancellation for fading mobile communication channels. 1999 IEEE AFRICON, Cape Town, South Africa, Sept.1999: 131-134.[7]Meng D, Wu Z, Liang H, Wu W. A novel time spreading technique for fading mobile channels. in FTC 2003 Proc., Beijing, China, Dec. 2003: 301-304.[8]孟德香，梁紅玉，吳偉陵. 基于同步時(shí)間擴(kuò)展處理的信道編碼，無(wú)線電工程，2004, 34(3): 7-9.[9]Sayeed A M.[J].Aazhang B. Exploiting Doppler diversity in mobile wireless communications. in Proc. 1997 Conf. Information Sciences and Systems (CISS97), Baltimore, MD.1997,:-[10]Lee J S, Miller L E等著, 許希斌, 周世東等譯. CDMA系統(tǒng)工程手冊(cè)(CDMA System Engineering Handbook),北京人民郵電出版社，2001.[11]Andoh H.[J].Sawahashi M, Adachi F. Channel estimation using time multiplexed pilot symbols for coherent Rake combining for DS-CDMA mobile radio. in Proc. PIMRC97, Helsinki, FI, Sept.1997,:- -
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