完美自我干擾消除之全雙工行動通訊系統

全雙工通訊是下一代行動通訊系統發展中非常受矚目的一項技術，它是指通訊裝置可以在同時間同頻段進行資料傳輸與接收，可改善傳統半雙工技術的頻譜使用效率，但在效能表現上，常受到自我干擾影響，造成系統效能降低。數位主動干擾消除是其中一種自我干擾消除技術，主要作用於經過數位化後的訊號，它的干擾消除效能常受到自我干擾訊號之通道估測誤差影響。因此本篇論文提出一個不需估測自我干擾訊號之通道的數位主動干擾消除技術，而且可以完全消除殘餘的自我干擾訊號，上鏈傳輸使用預編碼正交分頻多工系統，使得訊號頻率多樣性增加，針對低流量與高流量系統分別設計最小均方誤差接收機和最大似然維特比接收機。兩者之模擬結果皆顯示，當用戶位於細胞中心區域且上鏈傳輸參數相同情況下，在位元錯誤率為10-4時，提出的全雙工預編碼正交分頻多工系統效能勝過半雙工單載波正交分頻多工存取系統，此外，提出之系統的峰值功率比及傳送端複雜度皆低於半雙工單載波正交分頻多工存取系統。

關鍵字

全雙工通訊；自我干擾消除；自我干擾通道估測誤差；預編碼正交分頻多工系統；單載波正交分頻多工存取系統

並列摘要

Full-duplex (FD) communication is another topic of great attention in the fifth generation of mobile communications systems since it can improve or even double the spectral efficiency of the conventional half-duplex (HD) method. However, the performance of a FD transceiver is limited by self-interference. Digital active cancellation is one of self-interference cancellation techniques which operates after digitization. Its performance always suffers from the self-interference channel estimation error. In this thesis, a novel digital self-interference cancellation technique without self-interference channel estimation that cancels self-interference completely is proposed. A precoded orthogonal frequency division multiplexing (OFDM) uplink system is employed to increase frequency diversity. Minimum mean square error (MMSE) and maximum likelihood (ML) Viterbi receivers are designed for low traffic and heavy traffic systems, respectively. In both traffic systems, simulation results show that, for the cell-center users, the proposed FD precoded OFDM system outperforms the HD single carrier frequency division multiple access (SC-FDMA) system at a BER of 10^-4 with the same parameters in uplink. Moreover, the peak-to-average power ratio (PAPR) and the computational complexity of the transmitter of the proposed FD precoded OFDM system is lower than that of the HD SC-FDMA system.

並列關鍵字

full-duplex ； self-interference cancellation ； self-interference channel estimation error ； precoded OFDM ； SC-FDMA

參考文獻

[1] A. Sahai, G. Patel, C. Dick, and A. Sabharwal, “On the impact of phase noise on active cancellation in wireless full-duplex,” IEEE Trans. Veh. Technol., vol. 62, no. 9, pp. 4494–4510, Nov. 2013.

[2] J. Choi, M. Jain, K. Srinivasan, P. Levis, and S. Katti, “Achieving single channel, full duplex wireless communication,” in Proc. ACM Mobicom, 2010, pp. 1–12.

[3] E. Everett, A. Sahai, and A. Sabharwal, “Passive self-interference suppression for fullduplex infrastructure nodes,” IEEE Trans. Wireless Commun., vol. 13, no. 2, pp. 680–694, Feb. 2014.

[9] M. Duarte, C. Dick, and A. Sabharwal, “Experiment-driven characterization of fullduplex wireless systems,” IEEE Trans. Wireless Commun., vol. 11, no. 12, pp. 4296–4307, Dec. 2012.

[10] B. Kaufman, J. Lilleberg, and B. Aazhang, “An analog baseband approach for designing full-duplex radios,” in Proc. 47th Asilomar Conference on Signals, Systems and Computers, Nov. 2013, pp. 987–991.

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完美自我干擾消除之全雙工行動通訊系統

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