應用於多輸入/輸出多載波分碼多重進接系統的遞迴式多層級偵測方法之研究

Abstract

對於應用空間多重傳輸來增加頻譜使用效率的多輸入多輸出之多載波分碼多重進接系統，我們提出遞迴式多層級偵測方法。為了壓抑層級天線干擾，首先使用一個簡單的適應性最小平均平方誤差等化器，接著以層級天線干擾消除來重建及消除層級天線干擾。當大部分的決定結果足夠準確時，以多重路徑干擾消除技術結合等化器來收集多路徑通道中的路徑多樣性。除此之外，我們結合平行遞迴式多層級偵測方法及位元交錯之編碼調變。軟性資訊被用來調整適應性等化器和重建干擾訊號，以改善干擾消除的可靠度。

We propose iterative multi-layered detection methods for MIMO MC- CDMA systems which applies spatial multiplexing to increase spectral efficiency. In order to suppress layered-antenna interference, a simple adaptive MMSE equalizer is employed firstly, and layered-antenna interference cancellation scheme follows to reconstruct and cancel layered-antenna interference. When most decision results are accurate enough, multipath interference cancellation technique joins MMSE equalizer together to combine the path diversity over multipath channel. Besides, we combine the parallel iterative multi-layered detection method with bit-interleaved coded modulation. Soft information is exploited to adjust adaptive equalizer and reconstruct interference signals to improve the reliability of interference cancellation.