相關性通道下考慮直行連結之放大轉發式MIMO多中繼合作式通訊系統聯合收發機設計

MMSE-Based Transceiver Design For Distributed MIMO AF Cooperative Networks In Correlated Channels

梁瑋諭(Liang, Weiyu)

指導教授 ： 胡家彰

國立中正大學/工學院/通訊工程學系/碩士(2012年)

摘要

本文考慮在相關性通道情況下放大轉發 (amplify-and-forward, AF) 多重輸入多重輸出(multiple-input multiple-output, MIMO)多中繼(multiple relays)合作式通訊(cooperative communication)系統之聯合收發機設計，並加入來源端直行連結傳輸至目的端之路徑(source-destination link or direct link)於系統中。統合來源端預編碼器(precoder)與多中繼站加權(weighting)矩陣以及目的端解碼器(decoder)之設計制定成一最佳化的問題。基於最小均方誤差(minimum mean-square error, MMSE)準則聯合處理解碼矩陣及合併使用非線性矩陣形式共軛梯度法(nonlinear matrix-form conjugate gradient, MCG)搜尋區域最佳預編碼器以及各中繼加權矩陣。最後，電腦模擬結果驗證有考慮直行連結路徑的合作式通訊系統設計比沒有考慮直行連結路徑的設計表現來得優異。

關鍵字

放大轉發式 ； 相關性通道 ； 直行連結 ； 多輸入多輸出 ； 最小均方誤差 ； 多中繼節點 ； 預編碼器

並列摘要

In the paper, the source-precoder, multiple-relay amplifying matrices, and destination-equalizer combined optimization is investigated in distributed multiple-input multiple-output (MIMO) amplify-and-forward (AF) multi-relay networks with direct source-destination transmission in correlated fading channels. With the use of taking both the direct link (DL) and spatial correlation between antenna elements into account, the cooperative transceiver joint design is developed based on the minimum mean-squared error (MMSE) criterion under individual power constraints at the source and multiple-relay nodes. The optimization problem of the cooperative transceiver joint design is neither concave nor convex so that a nonlinear matrix-form conjugate gradient (MCG) algorithm is applied to explore local optimal solutions. Simulation results demonstrate that the cooperative transceiver joint design architecture for an AF-MIMO multiple-relay system outperforms substantially the non-cooperative transceiver design techniques on the bit-error-rate (BER) performance under the correlated fading channels.

並列關鍵字

Amplify-and-forward (AF) ； correlated channel ； direct link ； MIMO ； MMSE ； precoder

參考文獻

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