以符元交錯及訓練基礎的籬柵編碼非同調空時調變; Training-Based Symbol-Interleaved Trellis Coded Noncoherent Space-Time Modulation

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8265

Title:	以符元交錯及訓練基礎的籬柵編碼非同調空時調變;Training-Based Symbol-Interleaved Trellis Coded Noncoherent Space-Time Modulation
Authors:	張雅茹;Ya-ru Jhang
Contributors:	通訊工程研究所
Keywords:	空時碼;么正空時調變;籬柵碼;Unitary space-time modulation;Space-time code;Trellis code
Date:	2009-01-09
Issue Date:	2009-09-22 11:22:10 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	下一代通信系統對於高傳輸率及高機動性的要求以非常快之速度成長，空時碼是目前無線通信系統最有效克服衰減之技術及提供高可靠之傳輸。么正空時調變是一種在傳送天線及接收天線都不需知道通道狀態資訊之非同調空時碼；籬柵編碼么正空時調是一種用於區塊衰減通道的空時碼，其可以得到重大的編碼增益；之前的論文提出訓練基礎的籬柵編碼非同調空時調變，適當運用交錯器，將一個籬柵支脈上之空時碼打散在不同衰減區塊上，藉此可增加時間分集，因而於高訊號雜訊比時可得到非常好的效能。本論文提出一個新的籬柵編碼非同調空時調變，以訓練碼和符元交錯的方式，將一個籬柵支脈上之符元訊號打散在不同衰減區塊上，比起之前的論文可以獲得更大的時間分集增益。我們使用電腦去搜尋出使架構具有最佳位元錯誤率的生成矩陣。模擬結果證實此架構因具有較大的分集增益，因而於高訊號雜訊比時比起之前的論文有著較佳的符元錯誤機率。 The main goal of the next generation wireless communication systems provides high data rates and high mobile service for the Internet and multimedia applications. Space-time coding was one of the most effective techniques to combat fading and to provide high reliable transmission. A noncoherent space-time code named unitary space-time modulation(USTM) in which the transmit and the receive antennas do not know the channel state information; trellis coded USTM for the noncoherent block fading channel can obtain signigicant coding gains; the reviewed scheme proposed a training-based trellis coded noncoherent space-time modulation scheme by properly interleaving space-time signals for the block fading channels. This scheme can enlarge temporal diversity at the price of increased complexity and delay thus can have good performance at high SNR. In this thesis, we propose a scheme of training-based trellis coded noncoherent space-time modulation which has larger diversity gains by training-basing and symbol-interleaving for the block fading channels. We utilize computers to search the best generator matrix which let the proposed scheme have the best BER. Simulation results confirm that our scheme has larger diversity thus has better BER at high SNR than the reviewed scheme.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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