Multiple access channel with state uncertainty at transmitters
Multiple access channel with state uncertainty at transmitters
复制标题
发射机状态不确定的多址信道
DOI：
10.1109/isit.2013.6620470
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Shamai
中科院分区：
文献类型：
--
作者：
Shaofeng Zou;Yingbin Liang;S. Shamai
研究了受随机衰落系数和加性高斯噪声干扰的双用户衰落多址信道（MAC）。假设信道是块衰落的，并且每个发送方只向接收方知道自己的信道状态，而不知道其他发送方的信道状态。接收方完全了解信道状态信息（CSI）。研究了两种情况下的性能度量，即信道统计上的期望容量区域。对于第一种场景，用户1有多个状态，用户2只有一个状态，期望容量区域边界的大部分被表征。有趣的是，当两个发射机的CSI完全已知时，这些速率点也位于容量区域的边界上（即最佳可实现速率对）。此外，对于一些渐近区域，期望容量区域是完全表征的。对于第二种场景，其中用户1和用户2都有两种状态，研究了许多可实现的区域，并证明了它们在数值上接近外部边界。
Two-user fading multiple access channel (MAC) is investigated, which is corrupted by random fading coefficients and additive Gaussian noise. It is assumed that the channel is block fading, and each transmitter knows only its own channel state to the receiver, but does not know the other transmitter's channel state. The receiver has full knowledge of channel state information (CSI). The performance measure, the expected capacity region over channel statistics, is studied for two scenarios. For the first scenario, in which user 1 has multiple states, and user 2 has one state, most part of the boundary of the expected capacity region is characterized. Interestingly, these rate points are also on the boundary of the capacity region (i.e., the best achievable rate pairs) when the CSI is fully known at both transmitters. Furthermore the expected capacity region is fully characterized for some asymptotic regimes. For the second scenario, in which both users 1 and 2 have two states, a number of achievable regions are studied, and are demonstrated to be close to an outer bound numerically.