正交空时编码连续相位调制系统的信道估计算法

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1、第42卷第11期浙江大学学报(工学版)Vol.42No.112008年11月JournalofZhejiangUniversity(E口gi口eeringScience)Nov.2008DOI:10.3785/j.iss口.1008-973X.2008.11.004正交空时编码连续相位调制系统的信道估计算法赵民建，林科，陈沪东(浙江大学信息与电子工程学系，浙江杭州310027)摘要:针对准静态瑞利衰落信道中突发模式的正交空时编码连续相位调制(OSTC-CPM)，利用双发多收空时编码连续相位调制系统的波形正

2、交特性，提出了一种基于数据辅助的信道估汁算法.接收天线将得到的信号同步地乘上每一发射天线对应的训练序列，然后延迟一码元相加并除以该训练序列能量，估汁得到相应的信道衰落系数.理论分析结果表明，该算法的对数估汁方差随比特信噪比的增加而线性减小.对不同训练序列长度、过采样倍数和成形滤波器进行仿真，结果表明在准静态瑞利衰落信道中，估汁性能与理论分析结果吻合，系统的误比特性能与理想情况相差不到0.2dB.该算法适合OSTC-CPM系统在准静态衰落信道条件下的信道估汁.关键词:正交空时编码连续相位调制(OSTC-CP

3、M):准静态衰落信道;波形正交;估汁方差中图分类号:TN929.5文献标识码:^文章编号:1008-973X(2008)1l-1868-05Channelestimationalgorithmfororthogonalspace-timecodedcontinuousphasemodulationsystemsZHAOMin-jian,LINKe,CHENHu-do且g(Department011尺formαtzoηScienceαηdElectroηicEηgineering，ZhejiωzgUnive

4、rsity,Hαngzhou310027,Chiηα)Abstract:Adata-aidedchannelestimationalgorithmwasproposedforaburst-modeorthogonalspace-timecodedcontinuousphasemodulatio日COSTC-CPM)systemoverquasi-staticRayleighfadingchan日els.Thisalgorithmmainlyusesthewaveformorthogonalityofspa

5、ce-timecodedmodulationsystemswithtwotransmitantennasandmultiplereceiveantennas.Eachreceiveantennamultipliesthereceivedsignalbytheknowntrai日ingsequencewhichcorrespondingtooneofthetwotransmitantennas;thentheproductisdelayedforonesymbolinterval,andaddedtoget

6、herwiththecurrentsignal;finally,thefadingcoefficientofthecorrespondingchannelcanbeobtainedbydividingtheenergyofthetrainingsequence.Analyticalvarianceoftheestimationdeclineslinearlybyincreasingthebitsignal-to-noiseratiofortheproposedchannelestimator.Theeff

7、ectsoftraini日gsequenceleng巾，over-samplingratio,anddifferentpulseshapingfilterswereinvestigated.Simulationresultsmatchedthetheoreticalanalysis.Comparedwiththeknownchannel,thedifferenceofbiterrorrateCBER)waslessthanO.2dB.Therefore,thisalgorithmisappropriate

8、forOSTC-CPMsystemsoverquasi-staticRayleighfadingchannels.Keywords:orthogonalspace-timecodedcontinuousphasemodulationCOSTC-CPM);quasi-staticfadingchannel;waveformorthogonality;varianceofestimation近年来，随着对通信数据速率、传输效率等方