Two-Way AWGN Channel Error Exponents at Zero Rate
Two-Way AWGN Channel Error Exponents at Zero Rate
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零速率下的双向 AWGN 信道误差指数
DOI：
10.1109/isit.2018.8437797
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
N. Devroye
中科院分区：
文献类型：
--
作者：
K. Palacio;N. Devroye
推导了双向加性白色高斯噪声（AWGN）信道中，两个终端交换固定数目的消息M时的可扩展的差错指数区域。特别是，错误的指数区域为$M$ = 2消息下的预期功率和$M$ = 3消息下几乎肯定的功率约束。对于$M$ = 2消息的使用主动反馈被示出为导致误差指数增益超过当反馈/交互被忽略时的误差指数增益。对于$M$ = 3的消息和非对称信道，它示出了较弱的信道的错误指数可以通过主动反馈来改善，在较强的方向的错误指数降低的费用。对于充分不对称的信道增益，这可以优于通过使两个终端彼此独立地操作（忽略为另一个发送反馈的可能性）而实现的误差指数区域。
Achievable error exponent regions of a two-way additive white Gaussian noise (AWGN) channel, where two terminals exchange a fixed number of messages M, are derived. In particular, error exponent regions for $M$ = 2 messages under expected power and $M$ = 3 messages under almost sure power constraints are considered. For $M$ = 2 messages the use of active feedback is shown to lead to an error exponent gain over that when feedback / interaction is ignored. For $M$ = 3 messages and asymmetric channels, it is shown that the error exponent of the weaker channel may be improved through active feedback, at the expense of a decreased error exponent of the stronger direction. This may, for sufficiently asymmetric channel gains, outperform the error exponent region achieved by having both terminals operate independently of one another (ignoring the possibility of sending feedback for the other).