多載波頻率偏移合作式通訊系統下分散式空頻碼之研究

Study of Distributed Space-Frequency Codes for Cooperative Communication Systems with Multiple Carrier Frequency Offsets

劉俊輝(Jiun-Huei Liou)

指導教授 ： 王瑞騰

國立暨南國際大學/科技學院/通訊工程研究所/碩士(2011年)

https://doi.org/10.6837/NCNU.2011.00334

摘要

在本論文中，我們研究在合作式的無線通訊系統下(Cooperative Communication System)結合正交分頻多工(orthogonal frequency division multiplexing，OFDM)使頻率 選擇性衰減通道簡化為平坦衰減通道。我們分別使用三種空頻碼(space frequency coding，SFC)，討論在頻域下使用迫零(zero forcing)、最小平方錯誤率(minimum mean square error)接收器如何達到合作式的滿分集增益。在平坦衰減通道(flat fading channel)下，針對不同的中繼點做系統模擬，從模擬結果中可得知在不同的中繼點數 與頻率偏移下三種空頻碼的系統效能。

關鍵字

合作式無線通訊系統 ； 正交分頻多工 ； 空頻碼

並列摘要

In this thesis, we study in cooperative wireless communications system that combined Orthogonal Frequency Division Multiplexing (OFDM) to let frequency selective fading channel reduces to a flat fading channel.We are using three space-frequency codes (SFC) to discuss that we use ZF, and MMSE to achieve full cooperative diversity at receiver in the frequency domain.In the flat fading channel,we compared the performance of three space-frequencywhen multi relay nodes exist.

並列關鍵字

cooperative communication system ； OFDM ； space-frequency code

參考文獻

[1] J. N. Laneman and W. Wornell, “Distributed space-time-coded protocols

for exploiting cooperative diversity in wireless networks,” IEEE Trans.

Inform. Theory, vol. 49, pp. 2415–2425, Oct. 2003.

[2] M. Janani, A. Hedayat, T. E. Hunter, and A. Nosratinia, “Coded

cooperation in wireless communications: space-time transmission and