相關(guān)瑞利衰落信道上自適應(yīng)MQAM的性能分析

采用L條支路最大比合并分集接收的相關(guān)瑞利衰落信道容量，推導(dǎo)恒定發(fā)射功率自適應(yīng)M進(jìn)制正交幅度調(diào)制的頻譜效率，并將它們與獨(dú)立同分布瑞利衰落信道理論容量進(jìn)行比較。數(shù)值結(jié)果闡明相關(guān)性和天線設(shè)置對(duì)瑞利衰落信道容量和自適應(yīng)M進(jìn)制正交幅度調(diào)制性能的影響。

Closed-form solutions for the correlated Rayleigh fading channel capacity under L-branch Maximum Ratio Combining (MRC) diversity reception are obtained in this paper. The performance of constant-power adaptive M-ary Quadrature Amplitude Modulation (MQAM) schemes over correlated Rayleigh channels under MRC diversity reception is investigated. Closed-form expressions for spectral efficiency of adaptive MQAM assuming perfect channel estimation and negligible time delay are derived. Numerical results that illustrate the effect of correlation and antenna configurations on the correlated Rayleigh fading capacity and spectral efficiency of adaptive MQAM are also presented