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arXiv 1503.03130cs.ITmath.IT
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Wiener相位噪声信道的模型和信息速率

Models and Information Rates for Wiener Phase Noise Channels

Hassan Ghozlan, Gerhard Kramer

摘要:

波形信道被认为是由维纳相位噪声和加性高斯白噪声损坏的传输信号。建立了一种考虑滤波对相位噪声影响的离散时间信道模型。该模型基于多样本接收机,即,积分转储滤波器,其输出以高于信令速率的速率采样。它示出,在高信噪比(SNR),多采样接收机实现的速率,如果每个符号的样本数(过采样因子)的增长与立方根的SNR的增长与SNR的grammically。此外,前对数因子至少为1/2,并且可以通过幅度调制来实现。对于多样本接收机的近似离散时间模型,如果每个符号的样本数随着SNR的平方根而增长,则在高SNR下的容量pre-log至少为3/4。分析表明,相位调制实现了至少1/4的前对数,而幅度调制仍然实现了1/2的前对数。这严格大于每个符号仅具有一个样本的(近似)离散时间维纳相位噪声信道的容量前对数,其为1/2。数值模拟被用来计算由多采样接收机实现的信息速率的下限。仿真结果表明,在高信噪比下,过采样对强相位噪声和弱相位噪声都有好处。事实上,信息速率有时比使用常用的近似离散时间模型时大得多。

英文摘要:

A waveform channel is considered where the transmitted signal is corrupted by Wiener phase noise and additive white Gaussian noise. A discrete-time channel model that takes into account the effect of filtering on the phase noise is developed. The model is based on a multi-sample receiver, i.e., an integrate-and-dump filter whose output is sampled at a rate higher than the signaling rate. It is shown that, at high Signal-to-Noise Ratio (SNR), the multi-sample receiver achieves a rate that grows logarithmically with the SNR if the number of samples per symbol (oversampling factor) grows with the cubic root of the SNR. Moreover, the pre-log factor is at least 1/2 and can be achieved by amplitude modulation. For an approximate discrete-time model of the multi-sample receiver, the capacity pre-log at high SNR is shown to be at least 3/4 if the number of samples per symbol grows with the square root of the SNR. The analysis shows that phase modulation achieves a pre-log of at least 1/4 while amplitude modulation still achieves a pre-log of 1/2. This is strictly greater than the capacity pre-log of the (approximate) discrete-time Wiener phase noise channel with only one sample per symbol, which is 1/2. Numerical simulations are used to compute lower bounds on the information rates achieved by the multi-sample receiver. The simulations show that oversampling is beneficial for both strong and weak phase noise at high SNR. In fact, the information rates are sometimes substantially larger than when using commonly-used approximate discrete-time models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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