自适应编码调制系统中影响估计性能的信道参数及其对系统性能的影响

The Channel Parameters Affecting the Estimation and System Performance in ACM Systems

在已有的误差函数的基础上,结合信道的功率谱特性,分析了自适应编码调制(ACM)系统的估计性能,并推导出含有重要信道参数的误差函数的闭合表达式,找到了能够对估计性能产生影响的信道参数,例如,莱斯因子,到达角的角度扩展等等.通过对与估计性能相关的系统性能的分析,明确了这些信道参数对估计性能乃至整个系统的作用和影响.由于估计误差的存在,系统选择自适应编码调制方案的信道信噪比(CSNR)的门限也有相应的改变.在此研究了不同的信道传输环境对这种改变的影响程度.

The relationship between the mean square error （MSE） of estimation and the general power spectral of channels is discussed here. Deduce the expression of MSE function including variant important channel parameters, among which some ones affect the estimate performance significantly, such as the Rice factor, the spread of the angle of arrival and so on. Then, the system performance criteria associated with the estimate error function is analyzed and the impacts of these channel parameters on the chan- nel estimation and the system performances are explored. The thresholds of channel signal-to-noise ratio （CSNR） in ACM systems are also influenced by MSE. This affection is also investigated here under different propagation conditions.