标题： 关于相移键控在硬判决检测下的低信噪比容量 显示英文标题

标题： On the Low-SNR Capacity of Phase-Shift Keying with Hard-Decision Detection

摘要： 当接收端采用硬判决检测时，分析了在加性白高斯噪声（AWGN）和衰落信道下M进制PSK传输的低信噪比容量。得到了零信噪比处容量的一阶和二阶导数的闭合表达式。通过寻找宽带斜率和零频谱效率所需的比特能量，在低信噪比情况下分析了频谱效率与比特能量之间的权衡关系。从信息论分析中得出了实际的设计准则。对于相干和非相干情况分别进行了衰落信道分析，并确定了在低功率情况下不知道信道所导致的性能损失。 显示英文摘要

摘要： The low-snr capacity of M-ary PSK transmission over both the additive white Gaussian noise (AWGN) and fading channels is analyzed when hard-decision detection is employed at the receiver. Closed-form expressions for the first and second derivatives of the capacity at zero snr are obtained. The spectral-efficiency/bit-energy tradeoff in the low-snr regime is analyzed by finding the wideband slope and the bit energy required at zero spectral efficiency. Practical design guidelines are drawn from the information-theoretic analysis. The fading channel analysis is conducted for both coherent and noncoherent cases, and the performance penalty in the low-power regime for not knowing the channel is identified.