正交分頻多工之中繼系統的通道估計方法

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

099122404

專利證號

I 420848

專利獲證名稱

正交分頻多工之中繼系統的通道估計方法

專利所屬機關 (申請機關)

國立雲林科技大學

獲證日期

2013/12/21

技術說明

一種正交分頻多工之中繼系統的通道估計方法，其係應用在正交分頻多工系統上，以期望值最大化演算法（Expectation Maximization Algorithm）為基礎，分別對無線通訊系統中的一來源端至一中繼系統（Relay）的通道及該中繼系統至一目的端的通道做通道估計，該通道估計方法包含有步驟：建立一系統模型、進行通道向量矩陣化、設定期望值、最大化處理、疊代等步驟，該系統模型根據反離散傅立葉轉換分別對該來源端至該中繼系統及該中繼系統至該目的端建立通道，而通道估計結果可以瞭解通道訊號傳遞的強弱，並且根據通道階段資訊（Channel Step Information）來判斷通道的好壞進而決定要輸送訊號的資料量。 The issue of channel estimation is investigated for the orthogonal frequency-division multiplexing (OFDM) relaying system with amplify-and-forward (AF) operation mode. Channel estimation in the AF mode is unique in that both the source-to-relay and relay-to-destination channels are needed at the destination in order to perform optimum combining of the received signals from the direct (source-to-destination) and relay paths if a cooperative diversity transmission is employed. Until now, however, there have been only literatures to study the estimation of the composite channel of the relay path. In this work, an iterative expectation-maximization (EM) algorithm-based channel estimation is proposed for respective estimations of the source-to-relay and relay-to-destination links at the destination. Computer simulations show that the iterative channel estimator performs satisfactorily and converges rapidly.

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