Feedback strategies for white Gaussian interference networks
Feedback strategies for white Gaussian interference networks
复制标题
白高斯干扰网络的反馈策略
DOI：
10.1109/tit.2002.1003831
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
G. Kramer
中科院分区：
文献类型：
--
作者：
G. Kramer
白色高斯干扰网络是带有T发射器和R接收器的通道，其中接收到的符号是传输符号和白色高斯噪声的线性组合。本文考虑了以点对点方式通过网络传输K消息的情况，即，每个消息都是由一个恰好由一个发射器编码的，并且注定要恰好用于一个接收器。进一步假定可以使用反馈，以便每个发射器都可以看到其发送消息的接收器的输出。基于离散傅立叶变换（DFT）的沟通策略是为此类网络效果很好的。对于具有均等发射器的多门通道（k = t，r = 1），如果功率超出了一定的阈值，则策略可以实现反馈总和结果。对于具有固定发射器功率和较大k的相同通道，可实现的总和率约为（log log k）/2比没有反馈的总和率容量大。对于具有强对称性的广播通道（t = 1，k = r），这些策略与K的单调增加了总和率。容量区域通过“相关路由”。
A white Gaussian interference network is a channel with T transmitters and R receivers where the received symbols are linear combinations of the transmitted symbols and white Gaussian noise. This paper considers the case where K messages are transmitted through the network in a point-to-point manner, i.e., each message is encoded by exactly one transmitter and is destined for exactly one receiver. It is further assumed that feedback is available so that each transmitter sees the outputs of the receivers to which it is sending messages. Communication strategies based on the discrete Fourier transform (DFT) are developed that perform well for such networks. For multiple-access channels (K=T, R=1) with equal transmitter powers the strategies achieve the feedback sum-rate capacity if the powers are beyond some threshold. For the same channels with fixed transmitter powers and large K, the achievable sum-rate is approximately (log log K)/2 larger than the sum-rate capacity without feedback. For broadcast channels (T=1, K=R) with strong symmetries, the strategies achieve a monotonically increasing sum-rate with K. For interference channels (K=T=R) with strong interference, the strategies significantly enlarge the no-feedback capacity region by "correlation routing.".