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

发布时间：2018-07-31 08:16

【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210-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66 10-?′,幅度估计相对误差的绝对值小于53 10-′;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]:For the simultaneous frequency full-duplex wireless communication system, the multipath Rayleigh fading channel from the far to the near end is considered, and the self-interference channel from the near transmitting antenna to the receiving antenna is an additive white Gaussian noise channel. The influence of the amplitude of radio frequency cancellation and carrier phase error of self interference on the bit error rate of OFDM in the simultaneous frequency full duplex transmission scenario is analyzed. The results show that under the same signal-to-interference ratio and signal-to-noise ratio, the smaller the absolute value of amplitude and carrier phase estimation error is, the lower the bit error rate is. When the signal-to-interference ratio is -70 dB and the BER is 210-, if the SNR is less than 0.8 dB, the absolute value of carrier phase estimation error which needs RF interference cancellation is less than 66 10-10, and the absolute value of amplitude estimation relative error is less than 53 10 ~ (-1). If we expect to obtain 40 dB RF self-interference suppression effect, the absolute value of carrier phase estimation error of RF interference cancellation is less than 0.5 and the absolute value of amplitude estimation relative error is less than 1.
【作者单位】：电子科技大学通信抗干扰技术国防科技重点实验室;
【基金】：国家自然科学基金(61001087,61101034,61271164) 广东省联合基金重点项目(U1035002/L05) 新一代宽带无线移动通信网国家科技重大专项(2014ZX03003001-002,2012ZX03003010-003,2011ZX 03001-006-01)资助课题
【分类号】：TN929.537

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