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首页> 外文期刊>IEEE Transactions on Information Theory >Two Birds and One Stone: Gaussian Interference Channel With a Shared Out-of-Band Relay of Limited Rate
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Two Birds and One Stone: Gaussian Interference Channel With a Shared Out-of-Band Relay of Limited Rate

机译：两只鸟和一块石头：具有有限速率的共享带外中继的高斯干扰信道

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摘要

The two-user Gaussian interference channel with a shared out-of-band relay is considered. The relay observes a linear combination of the source signals and broadcasts a common message to the two destinations, through a perfect link of fixed limited rate $R_{0}$ bits per channel use. The out-of-band nature of the relay is reflected by the fact that the common relay message does not interfere with the received signal at the two destinations. A general achievable rate is established, along with upper bounds on the capacity region for the Gaussian case. For $R_{0}$ values below a certain threshold, which depends on channel parameters, in achievable rates asymptotically in regimes where joint a two-for-one gain is achievable by the capacity region of this channel is determined in this paper to within a constant gap of $Delta = 1.95$ bits. We identify interference regimes where a two-for-one gain in achievable rates is possible for every bit relayed, up to a constant approximation error. Instrumental to these results is a carefully designed quantize-and-forward type of relay strategy along with a joint decoding scheme employed at destination ends. Further, we also study successive decoding strategies with optimal decoding order (corresponding to the order at which common, private, and relay messages are decoded), and identify interference regimes where with an optimal decoding order, successive decoding may also achieve two-for-one gains similar to joint decoding; yet, in general, successive decoding produces unbounded loss asymptotically when compared to joint decoding.
机译：考虑具有共享带外中继的两用户高斯干扰信道。中继器观察源信号的线性组合，并通过固定限制速率的完美链接将公共消息广播到两个目的地。 $ R_ {0} $每次使用 位。中继的带外性质反映在以下事实：公共中继消息不会干扰两个目的地的接收信号。确定了一般可达到的速率，以及高斯情况下容量区域的上限。对于小于特定阈值（取决于通道参数）的 $ R_ {0} $ 值，在某些情况下，渐近可达到的速率通过确定此通道的容量区域，可以在一个恒定的间隙内实现 formula Formulatype =“ inline”> $ Delta = 1.95 $ < / tex> 位。我们确定了干扰机制，在这种机制下，每个中继比特都可以实现可实现速率的二比一增益，直到恒定的近似误差为止。对于这些结果有用的是精心设计的量化转发类型的中继策略，以及在目标端采用的联合解码方案。此外，我们还研究了具有最佳解码顺序（与公共，私有和中继消息的解码顺序相对应）的连续解码策略，并确定了在最佳解码顺序的情况下连续解码还可以实现两选二的干扰机制。获得类似于联合解码的收益；然而，通常，与联合解码相比，连续解码会渐近地产生无限大的损失。

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