RLS演算法適用於OFDMA系統之通道等化研究

Channel Equalization of OFDMA System Using RLS Algorithm

吳春發(Chun-Fa Wu)

指導教授 ： 魏存毅

國立臺北大學/電機資訊學院/通訊工程研究所/碩士(2011年)

摘要

在現行的多用戶使用者通訊系統中，OFDMA 系統已經被用來建構在LTE downlink 系統上。
本論文研究中，我們先嘗試使用指標輔助通道估計在OFDMA 系統上，發現在高車速下，指標輔助通道估計效果並不好。因此，我們提出了一個靜態RLS 輔助通道等化，透過模擬結果發現，在BER為0.1時，靜態RLS通道等化會優於指標通道估計2dB。
此外，為了降低 OFDMA 接收端配備了靜態RLS 的功率消耗，我們提出了一種動態RLS 輔助通道等化在 OFDMA 系統上。透過模擬結果，我們發現，在調變為64-QAM 情形下，我們所提出的動態RLS通道等化，在BER為0.05時，會優於指標通道估計約4dB。

關鍵字

遞迴最小平方演算法 ； 通道等化

並列摘要

In supporting the multi-user communications, OFDMA has been utilized to construct the download LTE system. In this paper we demonstrated that the OFDMA system using the Pilot Assisted Channel Estimation (PACE) performs poorly at high-vehicle speed. Hence we introduce a static RLS channel
equalization assisted OFDMA system which outperforms the former OFDMA system by 2 dB at the target BER of 0.1. Moreover, in order to reduce the power consumption of the OFDMA receiver equipped with the static RLS equalization, we propose a novel dynamic RLS channel equalization
assisted OFDMA system. In the simulation results, we showed that when the high-level modulation 64-QAM was exploited, the proposed dynamic RLS channel equalization assisted OFDMA system outperformed the PACE aided counterpart system by about 4 dB at the target BER of 0.05.

並列關鍵字

RLS Algorithm ； Channel Equalization

參考文獻

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