Random coding for additive Gaussian channels with feedback
Random coding for additive Gaussian channels with feedback
复制标题
带反馈的加性高斯通道的随机编码
DOI：
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发表时间：
1990
影响因子：
2.5
通讯作者：
L. Ozarow
中科院分区：
文献类型：
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作者：
L. Ozarow
分析了带反馈的离散时间加性高斯噪声信道的随机编码策略。人们早就知道，只要加性噪声过程不是白色的，反馈就可以增加这种信道的容量。文中证明了当信号功率趋于零时，反馈容量与无反馈容量之比可能严格大于1，如果噪声谱为零，则总能获得严格的正增益。当噪声频谱从零有界时，情况并非如此。还证明了随机编码不能达到容量，其中码字是从平稳高斯序列的集合中选择的。>；
A random coding strategy for discrete-time additive Gaussian noise channels with feedback is analyzed. It has long been known that feedback may increase the capacity of such channels as long as the additive noise process is not white. Here, it is proved that a strictly positive gain is always achieved and that, as the signal power goes to zero, the ratio of feedback capacity to capacity without feedback may be strictly greater than one if the noise spectrum has a null. This is not the case when the noise spectrum is bounded away from zero. It is also demonstrated that random coding, where the codewords are chosen from an ensemble of stationary Gaussian sequences, does not achieve capacity. >