基于传输径修正的改进型TD-SCDMA信道估计法
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摘要
针对3G移动通信中的某些特殊应用场景,如信号侦查、定位及信号的智能干扰等需要对通信信道进行快速准确估计的要求,在B.Steiner信道估计法的基础上,提出一种新型的改进方法。该方法首先对B.Steiner信道估计结果进行门限处理,然后对保留径的响应进行最大比增益修正,从而进一步减弱噪声对系统的影响。在TD-SCDMA的协议测试模型case3条件下进行仿真,结果表明,在不明显增加算法复杂度的前提下,同一误码率时该方法所需输入信噪比降低了1~2 d B。
Some specific application of the 3G communication,such as signal detection,location and intelligent signal interference,need quick and accurate channel estimation. Based on B. Steiner algorithm,an improved channel estimation algorithm is proposed. In this method,the result of B. Steiner estimation is processed by a setting threshold firstly,and then the rest of them is modified by the maximum proportion. Thus,the influence of noise is further weakened. Simulation experiment is carried out under the condition of specific test model case 3 of TD-SCDMA system,the results demonstrate the SNR of the input signal that the system required reduces 1 ~ 2 d B with a certain bit error rate. In addition,this method does not increase the computation.
Some specific application of the 3G communication,such as signal detection,location and intelligent signal interference,need quick and accurate channel estimation. Based on B. Steiner algorithm,an improved channel estimation algorithm is proposed. In this method,the result of B. Steiner estimation is processed by a setting threshold firstly,and then the rest of them is modified by the maximum proportion. Thus,the influence of noise is further weakened. Simulation experiment is carried out under the condition of specific test model case 3 of TD-SCDMA system,the results demonstrate the SNR of the input signal that the system required reduces 1 ~ 2 d B with a certain bit error rate. In addition,this method does not increase the computation.
引文
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[14]3Gpp TS 25.945,3rd Generation Partnership Project,Technical Specification Group Radio Access Network.RF Requirements for 1.28Mcps UTRA TDD options[S].2001.
[2]李啸天,雷菁,刘伟,等.平坦慢衰落信道下基于HOS的PSK调制盲信道估计[J].通信学报,2015,36(5):1-8.
[3]STEINER B,BAIER P W.Low cost channel estimation in the uplink receiver of CDMA mobile radio systems[J].Frequenz,1993,47(11-12):292-298.
[4]陈艳杰,王丹.协作通信系统信道估计算法研究[J].计算机仿真,2015,32(8):217-220.
[5]康绍莉.裘正定,李世鹤.TD-SCDMA系统中低代价信道估计方法的改进[J].通信学报,2002,23(10):108-113.
[6]常永宇,黄莉莉,杨大成.TD-SCDMA系统中信道估计算法的性能分析及改进[J].电子与信息学报,2005,27(7):1110-1113.
[7]李鹏,张敏军.TD-SCDMA系统中一种基于门限处理的信道估计[J].西华大学学报(自然科学版),2010,29(1):1-3.
[8]赵德香,马秀荣,白媛,等.基于阈值处理的TD-SCDMA下行多用户信道估计方法[J].电子学报,2012,40(9):1904-1908.
[9]仲伟志,王红娟.基于改进PLS和PLS_ZP算法的卫星移动通信信道估计[J].四川大学学报(工程科学版),2015,47(1):156-161.
[10]李世鹤.TD-SCDMA第三代移动通信系统标准[M].北京:人民邮电出版社,2002.
[11]KLEIN A,KALEH G K,BAIER P W.Zero forcing and minimum meansquareerror equalization for multiuser detection in code-division multiple-access channels[J].Vehicular Technology,IEEE Transactions on,1996,45(2):276-287.
[12]姜凯.基于门限处理的信道估计算法研究[D].天津:天津理工大学,2013.
[13]卿朝进,唐友喜,邵士海.一种多用户辅助的TD-SCDMA下行信道估计方法[J].电子学报,2010,38(4):934-938.
[14]3Gpp TS 25.945,3rd Generation Partnership Project,Technical Specification Group Radio Access Network.RF Requirements for 1.28Mcps UTRA TDD options[S].2001.