基於寬頻合作式通訊之中繼群組多元傳送效能分析

現今無線通訊系統中，多輸入多輸出(Multiple-In Multiple-Out；MIMO)技術為最受歡迎的技術之一。原因在於可以利用多根天線傳送與接收在不需要額外增加頻譜資源與功率就可以達到更高速以及更可靠的傳送。就上傳機制而言，手持裝置(如手機、PDA等)因為受限於體積、成本以及硬體效能等等限制，而其無法擁有多根天線傳輸，使得上傳無法達到與下傳機制同等效能。　　在本篇論文中，首先探討分析單個中繼站(Relay)在傳統的合作式通訊(Cooperative Communication)上的系統容量；而中繼站的轉送方式主要分為放大轉送(Amplify-and-Forward；AF)和解碼轉送(Decode-and-Forward；DF)。在本篇論文裡面，最主要探討在解碼轉送的機制上面，利用此機制配合多個中繼端來達成多天線技術中的空間頻率塊狀碼(Space Frequency Block Code；SFBC)，而我們使用此編碼技術最主要的原因在於此編碼可以增加系統的可靠度，並且不會減少系統的通道容量(Capacity)。然而在傳統的空間時間塊狀碼(Space Time Block Code；STBC)之下，會因為所花費的時間過多而造成系統的容量下降，但是好處就是可以讓系統可靠度上升。在本篇論文裡面，我們也可以看到使用了多個中繼站的技術之下，如何去選擇一組最好的中繼站，讓此組中繼站使用SFBC編碼傳送，並且我們會討論系統選擇中繼端的機制：正交分頻多工(Orthogonal Frequency Division Multiplexing；OFDM)以及正交分頻多重存取(Orthogonal Frequency Division Multiple Access；OFDMA)之下的系統容量行為。

關鍵字

多輸入多輸出；合作式通訊；解碼轉送；正交分頻多工；正交分頻多重存取；中繼端群組

並列摘要

owadays, the Multiple-in, Multiple-Out is one of the most popular technologies in the wireless communication system. The reason is we can use lots of antenna to not only transmission and receive without increasing extra spectrum resource and power but also approach higher and more reliable transmission. When it comes to the uploaded mechanism, the handheld device such as cell phone and the PDA, which is limited to its measurement, cost and hardware efficiency so it is not available to transmission by lots of antenna. As the result of this condition, the uploading could not have the same efficiency as downloading. In this paper, at the beginning, we discuss to analyzing that one relay’s system capacity in the traditional cooperation communication. The main way for relay to transmission is separate two parts: AF and DF. In this paper, We put the main point on discussing the mechanism for decoding transmission. By this mechanism, we approach the SFBC in the multi-technology with multiple relay, the main reason about we use this coding technology is to increase the system reliability and do not decrease the system capacity. However, under the traditional STBC, the system capacity decreased which caused by the time costs, but on contrary, the advantage is it increase the system reliability. In this paper, We also acquire how to choose the best set of relay, make the relay to transmission the SFBC code with using multiple relay technology. Furthermore, we’re going to discuss the system capacity behavior of the mechanism, OFDM and OFDMA for system to choose the relay.

並列關鍵字

MIMO ； Cooperative Communication ； DF ； OFDM ； OFDMA ； Relay-grouping

參考文獻

[10] Jae Cheol Park, Tan Tai Do and Yun Hee Kim, “Outage Probability of OFDM-Based Relay Networks with Relay Selection,” in Proc. Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st. 2010, pp. 1-5.

[1] Nosratinia A., Hunter T.E., and Hedayat A. “Cooperative Communication In Wireless Networks,” Communications Magazine, IEEE, vol. 42, pp. 74-80, 2004.

[3] Gerhard Bauch, “Mutual Information of Multiple-Input Multiple-Output (MIMO) Transmission Schemes, ” International Journal of Wireless Information Networks, vol. 12, No. 4, December 2005.

[4] J. Nicholas Laneman and Gregory W. Wornell, “Distributed Space-Time Coded Protocols for Exploiting Cooperative Diversity in Wireless Networks,” IEEE Transactions on information theory, vol. 49, no. 10, pp. 2415-2425, Oct 2003.

[5] Wendong Yang and Yueming Cai, “A Block-based OFDM Decode-and-Forward Relaying Scheme for Cooperative Wireless Networks,” in Proc. Communications and Information Technology, 2009. ISCIT 2009. 9th International Symposium on. 2009.

國際替代計量

基於寬頻合作式通訊之中繼群組多元傳送效能分析

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