合作式通訊在解碼前送的中繼站網路中使用分散半正交空時區塊碼 且考慮訊息交換錯誤

A Distributed Quasi-Orthogonal Space Time Block Code for Cooperative Communication with Information Exchange Errors for Decode-and-Forward Relay Networks.

任修辰(Shiou-Chen Jen)

指導教授 ： 曾恕銘

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00634

摘要

在此篇文章中，我們設計了一個全速率半正交空時區塊碼加入解碼前送的中繼站網路，在傳送端擁有四根獨立傳送天線，中繼站擁有1根接收天線、四根傳送天線，目的端有一根接收天線。在此架構中，我們考慮四個使用者間的通道狀況，用來決策半正交空時區塊碼矩陣要使用解碼前傳或放大前送模式。因此我們提出的是一個以半正交空時區塊碼矩陣為架構嵌入適應性解碼前送/放大前傳元素，並根據傳送端與傳送端之間的通道係數是否大於/小於決策值來判定。在模擬結果顯示，所提出的半正交空時區塊碼矩陣嵌入適應性解碼前送/放大前傳矩陣元素優於傳統的半正交空時區塊碼(所有矩陣元素使用解碼前送模式)大約7dB的增益在10-4 BER，原因是傳統的半正交空時區塊碼未考慮資料交換錯誤而損失了全分集性。

關鍵字

半正交空時區塊碼 ； 分散編碼 ； 合作式通訊系統 ； 解碼前送 ； 最大概似機率解碼演算法

並列摘要

In this paper, we design the full-rate full-diversity quasi-orthogonal space time block code (QOSTBC) matrix for decode-and-forward (DAF) relay networks with four independent single-antenna source nodes, a single-antenna destination node and a single receive four-transmit-antenna relay node. In this scheme, we consider the channel states between the four users to select the elements of the DQOSTBC matrix to be decode and forward (DAF) or amplify and forward (AAF) types. Thus the proposed scheme is a DQOSTBC matrix with embedded adaptive DAF/AAF elements, based on the source-to-source channel coefficient is above or below a threshold.
By the simulation results, the proposed DQOSTBC with adaptive DAF/AAF matrix elements is approximately 7dB better than the traditional DQOSTBC (all matrix elements are fixed to DAF type, by Zhengquan et. al.) at 10-4 bit error rate (BER) because the traditional DQOSTBC loses full diversity due to information exchange errors.

並列關鍵字

QOSTBC ； Distributed Coding ； Cooperative Networks ； Decode and Forward ； maximum-likelihood decoding algorithm

參考文獻

[1] V. Tarokh, H. Jafarkhani and A. R. Calderbank, “Space–Time Block Coding for Wireless Communications: Performance Results,” IEEE Journal on Selected Areas in Communications, vol. 17, no.3, 1999, pp. 451 – 460.

[3] H. Jafarkhani, “A quasi-orthogonal space-time block code,” IEEE Transactions on Communications, vol. 49, no. 1, 2001, pp. 1-4.

[4] W. Su and X. G. Xia, “Signal constellations for quasi-orthogonal space-time block codes with full diversity,” IEEE Transactions on Information Theory, vol. 50, no. 10, 2004, pp. 2331-2347.

[5] J. N. Laneman and G. W. Wornell, “Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks,” IEEE Transactions on Information Theory, vol. 49, no. 10, 2003, pp. 2415-2425.

[6] S. Yiu, R. Schober, and L. Lampe, “Distributed Space-Time Block Coding,” IEEE Transactions on Communications, vol. 54, no 7, 2006, pp. 1195–1206.