用於上行大量多輸入多輸出系統的相差APSK&QAM;Differential APSK & QAM in Uplink Massive MIMO Systems

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题名:	用於上行大量多輸入多輸出系統的相差APSK&QAM;Differential APSK & QAM in Uplink Massive MIMO Systems
作者:	潘聿銘;Pan, Yu-Ming
贡献者:	通訊工程學系
关键词:	大量多輸入多輸出系統;上行;APSK;QAM;相差編碼
日期:	2018-10-12
上传时间:	2019-04-02 15:00:08 (UTC+8)
出版者:	國立中央大學
摘要:	大量多輸入多輸出系統是近年來熱門的研究，而相差編碼不需要傳送前導序列做通道估測，因此不會有前導序列汙染的問題。最近一個用於上行的大量多輸入多輸出的相差編碼QAM方法被提出，它在接收天線多達1000根時，錯誤效能會比傳統的相差APSK方法還要好。在前人的論文中，指出此相差QAM方法的一些問題並解決這些問題，為16-QAM建構新的相差編碼表。在使用同樣偵測器下，比較相差16-APSK與相差16-QAM的錯誤效能，以及使用不同偵測器比較同樣傳送端的錯誤效能，模擬結果顯示無論接收天線個數多少，16-APSK都有最好的錯誤效能。在本篇論文中，我們為32-QAM建構新的相差編碼表。在使用同樣偵測器下，我們比較相差32-APSK與相差32-QAM的錯誤效能，以及使用不同偵測器比較同樣傳送端的錯誤效能，模擬結果顯示無論接收天線個數多少，32-APSK都有最好的錯誤效能，且更改16-APSK內外點數不同的星座圖。除此之外，針對兩階段雙向中繼無線通訊，我們提出一種中繼點的非同調檢測法。根據此檢測法的雜訊分析，我們讓兩傳送端使用轉動不同角度的MPSK訊號星座圖做相差編碼，並提出了幾種架構，以改善中繼點的錯誤率。先將中繼點判斷兩傳送端訊號的做法改成基地台判斷兩用戶訊號，再將其延伸到更多用戶情形。 ;Massive MIMO systems are popular studies in recent years. Differential encoding scheme is not required to transmit pilot sequence for channel estimation, so it does not cause pilot contamination. A differentially encoded QAM (quadrature amplitude modulation) scheme for uplink massive MIMO was proposed recently which outperforms conventional differential APSK (amplitude-phase shift keying) scheme for 1000 receiver antennas. In the predecessors′ papers raise and try to resolve some questions about this differential QAM scheme. construct new tables for differentially encoded 16-QAM. compare differential 16-QAM with differential 16-APSK for the same detector, and compare the detector with a conventional detector for the same transmitter. Simulation results show that differential 16-APSK has the best error performance for any number of receiver antennas. In this letter, we construct new tables for differentially encoded 32-QAM. We compare differential 32-QAM with differential 32-APSK for the same detector, and compare the detector with a conventional detector for the same transmitter. Simulation results show that differential 32-APSK has the best error performance for any number of receiver antennas. and changing the number of points inside and outside for 16-APSK. In addition, for two-way two-phase relaying wireless communication, we propose a non-coherent detection method for relay points. According to the noise analysis of this detection method, we let the two transmitting end use the MPSK signal constellation diagrams rotating at different angles for phase difference encoding, and propose several architectures to improve the error rate of the relay point. The paper will first change the way the relay point judges the two transmitter signals to the basestation to determine the two user signals, and then extend it to more users.
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