LMMSE Estimation of Equivalent Noise Variance in Amplify-and-Forward Relay Communication Systems
學年 100
學期 1
出版（發表）日期 2011-10-01
作品名稱 LMMSE Estimation of Equivalent Noise Variance in Amplify-and-Forward Relay Communication Systems
作品名稱（其他語言）
著者 Yih, Chi-Hsiao
單位 淡江大學電機工程學系
出版者 臺北市：中國電機工程學會
著錄名稱、卷期、頁數 International Journal of Electrical Engineering=電機工程學刊 18(5), pp.235-243
摘要 For amplify-and forward (AF) relay communication systems with coherent modulation, the destination node requires the channel state information and equivalent noise variances of all diversity links to perform maximal ratio combining. In this paper, we design a linear minimum mean squared error (LMMSE) estimator to estimate the equivalent noise variance of the source-relay-destination (SRD) link in AF relay networks with either a variable or fixed amplification gain. Pilot symbol assisted modulation is employed by the transmitter to facilitate estimation tasks at both the relay and destination nodes. In the case of variable amplification gain, our analyses and simulation results show the mean squared error (MSE) of the estimated equivalent noise variance of the SRD link does not necessarily decrease as the signal-to-noise (SNR) increase. Moreover, the estimation error of the equivalent noise variance of the SRD link results in SNR mismatch which degrades the bit-error-rate (BER) performance of AF relay networks. On the other hand, the AF relay system with a fixed amplification gain has a smaller MSE of the estimated equivalent noise and its BER performance is more robust for the mismatched SNR.
關鍵字 Relay system;Amplify-and-forward;Maximal ratio combining;Minimum mean squared error estimation;Pilot symbol assisted modulation
語言 en_US
ISSN 1812-3031
期刊性質 國內
收錄於 EI
產學合作
通訊作者
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,紙本
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