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On Index Coding in Noisy Broadcast Channels with Receiver Message Side Information

机译:具有接收者消息边信息的嘈杂广播信道中的索引编码

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This letter investigates the role of index coding in the capacity of AWGN broadcast channels with receiver message side information. We first show that index coding is unnecessary where there are two receivers; multiplexing coding and superposition coding are sufficient to achieve the capacity region. We next show that, for more than two receivers, multiplexing coding and superposition coding alone can be suboptimal. We give an example where these two coding schemes alone cannot achieve the capacity region, but adding index coding can. This demonstrates that, in contrast to the two-receiver case, multiplexing coding cannot fulfill the function of index coding where there are three or more receivers.
机译:这封信调查了带有接收方消息辅助信息的索引编码在AWGN广播信道容量中的作用。我们首先证明,在有两个接收器的地方,索引编码是不必要的。多路复用编码和叠加编码足以实现容量区域。接下来我们表明,对于两个以上的接收器,单独的复用编码和叠加编码可能不是最佳的。我们给出一个示例,其中仅这两种编码方案无法实现容量区域,但是添加索引编码则可以。这表明,与两个接收器的情况相反,在有三个或更多接收器的情况下,多路复用编码不能实现索引编码的功能。

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