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提出了一种新的简化软判决度量,并进一步推广到一般的p范数情形,得到了广义的简化软判决度量生成办法.同时给出了几种不同参数下LDPC编码的16QAM/64QAM系统的误比特率性能的计算机仿真结果.仿真结果表明,无论是在AWGN信道还是在多径衰落信道中,所提出的简化方法都没有性能损失.更重要的是,由于无需噪声方差估计,该方法可以简化系统实现,大大降低了实现的复杂度.进一步的计算机仿真显示,在高信噪比的多径信道中,当p略小于2时,广义的简化软判决度量比传统方法的误比特率性能要好.
A new simplified soft-decision metric is proposed and extended to a general p-norm case, and a generalized approach to generate simplified soft-decision metrics is proposed. At the same time, several different parameters of LDPC-coded 16QAM / 64QAM system Simulation results show that the proposed simplified method has no performance loss in either AWGN channel or multi-path fading channel.More importantly, this method can estimate the noise variance without noise variance estimation Simplify the system implementation and greatly reduce the complexity of implementation.Further computer simulations show that the generalized simplified soft decision metric is better than the traditional method in bit error rate multipath channel when p is slightly less than 2, It is better.