ADC量化对同频全双工数字自干扰消除的误码率性能分析  

Analysis of ADC Quantizing Affection on SER Performance of Self-interference Canceling Common-frequency Full-duplex System

作　　者：张志亮[1] 罗龙[2] 邵士海[1] 潘文生[1] 沈莹[1] 唐友喜[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731 [2]华为技术有限公司,深圳518129

出　　处：《电子与信息学报》2013年第6期1331-1337,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61271164;60832007;60901018;60902027;U1035002/L05;61001087;61101034);国家科技重大专项(2010ZX03003-002-01;2011ZX03001-006-01;2010ZX03007-003);华为创新基金资助课题

摘　　要：同频全双工由于在同时工作的收发通道上使用相同的频率资源,因此本地接收机需要进行自干扰消除。数字域干扰消除方法在模数转换器(ADC)器件采样后进行,ADC位数、干信比、量化判决准则直接影响干扰消除效果和系统误码性能。该文分析了ADC位数、干信比、QAM调制误码性能三者的内在关系;推导了误码率的闭合表达式;仿真验证了数学推导的正确性和有效性。仿真结果表明,随着干信比的减小和ADC位数的增加,误码率性能呈宏观改善趋势,但从特定的微观片段来看,会出现性能波动,甚至会接近无量化误差的误码率性能。Common-frequency full-duplex systems send and receive signals simultaneously in the same frequency. Therefore, self-interference will exist in the local receiver and interference cancellation is necessary. Digital interference cancellation is applied after Analog-to-Digital Converter （ADC） sampling. ADC bit number, Interference-to-Signal Ratio （ISR）, and quantizing judgment scheme affect both interference cancellation and Symbol Error Ratio （SER）. In this paper, the essential relationship among ADC bit number, ISR, and SER of Quadrature Amplitude Modulation （QAM） is analyzed; A closed-form expression of SER is developed; And simulation results are presented to support the SER expression. The simulation results show that： when ISR decreases or ADC bit number increases, SER of this kind of system decreases in large scale, and fluctuates in small scale; some fluctuations of SER are dramatic, which can approach to the SER of the system without quantization error.

关 键 词：无线通信 干信比 模数转换器(ADC) 数字干扰对消 全双工 误码率 

分 类 号：TN92[电子电信—通信与信息系统]