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CDMA通信系统中常规的匹配滤波器接收机无法克服CDMA的多址干扰和远近效应 ,而已有的干扰抑制的多用户接收机都比较复杂 ,在进行干扰对消中均需要对信号进行重建 ,增加了系统延时。文中提出了一种基于门限判决和symbol级对消的多用户检测方法 ,它在symbol级上重构了真正的多址干扰成分 ,并依据门限 ,选择性地在symbol级上进行对消。理论分析和数值计算表明这种方法与常规方法和其它干扰对消方法相比能够有效减少运算量 ,提高解调信噪比和处理速度 ,提高抗多址干扰能力。
Conventional matched filter receivers in CDMA communication systems can not overcome the multiple access interference and the near-far effect of CDMA. However, the existing multi-user receivers with interference suppression are complicated, and signals need to be reconstructed and increased in interference cancellation The system delay. In this paper, a multi-user detection method based on threshold decision and symbol-level cancellation is proposed, which reconstructs the true multiple access interference components at the symbol level and selectively cancels them at the symbol level according to the threshold. Theoretical analysis and numerical calculation show that compared with the conventional method and other interference cancellation methods, this method can effectively reduce the computational complexity, improve the signal-noise ratio and processing speed of demodulation, and improve the anti-multiple access interference ability.