一種新的導(dǎo)頻符號(hào)輔助下的信道衰落估計(jì)方法
A NEW METHOD OF PILOT-SYMBOL-AIDED CHANNEL FADING ESTIMATION
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摘要: 本文提出一種新的導(dǎo)頻符號(hào)輔助下的信道衰落估計(jì)方法。它同時(shí)利用導(dǎo)頻符號(hào)和數(shù)據(jù)符號(hào)進(jìn)行信道衰落估計(jì)和補(bǔ)償，而不同于傳統(tǒng)的信道衰落估計(jì)只利用導(dǎo)頻符號(hào)的信息。此方法具有實(shí)現(xiàn)簡(jiǎn)單，延時(shí)小的優(yōu)點(diǎn)。針對(duì)16PSK和16QAM調(diào)制方式作了仿真，結(jié)果顯示導(dǎo)頻符號(hào)輔助下的16QAM的性能優(yōu)于16PSK，采用信道衰落估計(jì)與相干檢測(cè)結(jié)合的16PSK性能又好于采用差分檢測(cè)的16PSK的性能。
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關(guān)鍵詞:
- 信道估計(jì);導(dǎo)頻符號(hào)輔助;衰落補(bǔ)償
Abstract: A new method of pilot-symbol-aided(PSA) channel fading estimation is proposed,which uses the data symbols and the pilot symbols to perform channel fading estimation and fading compensation,but normally only pilot symbols are used to estimate the signal distor-tion.The technique has the advantages of simple implementation and short delay time.The simulation based on 16PSK and 16QAM shows the performance of PSA-16QAM is better than that of PSA-16PSK,and the use of PSA technique can improve the performance relative to the differential detection. -
Cavers J K.An analysis of pilot aided modulation for Rayleigh fading channels[J].IEEE Trans.on Veh.Tech.1991,40(4):686-693[2]Liu C L,Feher K.Pilot-symbol aided coherent M-ary PSK in frequency-selective fast Rayleigh fading channels[J].IEEE Trans.on COM.1994,42(1):54-62[3]Lau H K,Cheung S W.A pilot symbol-aided technique used for digital signals in multipath environments,in Proc.IEEE Int.Conf.Comm.,New Orleans,USA:May 1994,1126-1130.[4]Jeruchim M C,Balaban P,Shanmugan K S.Simulation of Communication Systems.New York:Plenum Press,1987,706-708. -
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