多径瑞利衰落信道条件下射频干扰抵消误差对CCFD系统中OFDM性能的影响
doi: 10.3724/SP.J.1146.2013.00316
Impact of RF Self-interference Cancellation Errors on OFDM Based on CCFD System in Multipath Rayleigh Fading Channel
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摘要: 针对同时同频全双工无线通信系统，考虑远端到近端的无线信道为多径瑞利衰落信道，近端发射天线到接收天线的自干扰信道为加性白高斯噪声信道，分析了同时同频全双工传输场景中，自干扰射频抵消幅度及载波相位误差对OFDM误码率的影响。结果表明，在相同信干比和信噪比条件下，幅度和载波相位估计误差的绝对值越小，误码率越低；针对载波频率2.3 GHz, OFDM子载波个数4096，子载波间隔15 kHz的同时同频全双工传输方式，在信干比为-70 dB，误码率为10-2时，若期望信噪比损失小于0.8 dB，则需要射频干扰抵消的载波相位估计误差的绝对值小于610-6，幅度估计相对误差的绝对值小于310-5；若期望获得40 dB的射频自干扰抑制效果，则射频干扰抵消的载波相位估计误差的绝对值小于0.5，幅度估计相对误差绝对值小于1%。Abstract: In this paper, the Bit Error Rate (BER) performance of OFDM based on Co-time Co-frequency Full Duplex (CCFD) is analyzed with amplitude estimation error of self-interference and phase error, in remote multi-path Rayleigh fading channel and Additive White Gaussian Noise (AWGN) self-interference channel. The results show that BER generally decreases while the absolute value of time error and amplitude error decreases for fixed Signal to Interference Ratio (SIR). Phase error610-6 and amplitude error 310-5 leads to 0.8 dB degradation on condition of 2.3 GHz carrier frequency, -70 dB SIR, sub-carrier number 4096, sub-carrier separation 15 kHz, BER 10-2. Phase error 0.5 and amplitude error 1% achieved 40 dB Interference Cancellation Ratio (ICR) under the same conditions.
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