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首页> 外文期刊>Information Theory, IEEE Transactions on >Outage Behavior of Discrete Memoryless Channels Under Channel Estimation Errors
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Outage Behavior of Discrete Memoryless Channels Under Channel Estimation Errors

机译：信道估计误差下离散无记忆信道的中断行为

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摘要

Communication systems are usually designed by assuming perfect channel state information (CSI). However, in many practical scenarios, only a noisy estimate of the channel is available, which may strongly differ from the true channel. This imperfect CSI scenario is addressed by introducing the notion of estimation-induced outage (EIO). We derive a single-letter characterization of the maximal EIO rate and prove an associated coding theorem and its strong converse for discrete memoryless channels (DMCs). The transmitter and the receiver rely on the channel estimate and the statistics of the estimate to construct codes that guarantee reliable communication with a certain outage probability. This ensures that in the non-outage case the transmission meets the target rate with small error probability, irrespective of the quality of the channel estimate. Applications of the EIO capacity to a single-antenna (nonergodic) Ricean fading channel are considered. The EIO capacity for this case is compared to the EIO rates of a communication system in which the receiver decodes by using a mismatched maximum-likelihood (ML) decoder. The effects of rate-limited feedback to provide the transmitter with quantized CSI are also investigated.
机译：通常通过假设完美的信道状态信息（CSI）来设计通信系统。然而，在许多实际情况下，仅可获得信道的噪声估计，这可能与真实信道有很大不同。通过引入估计诱发中断（EIO）的概念来解决这种不完善的CSI方案。我们推导出最大EIO速率的单字母特征，并证明相关的编码定理及其对离散无记忆通道（DMC）的强逆。发射器和接收器依靠信道估计和估计的统计数据来构造代码，以保证以一定的中断概率进行可靠的通信。这确保了在非中断情况下，无论信道估计的质量如何，传输都以很小的错误概率满足目标速率。考虑了将EIO容量应用于单天线（非遍历）Ricean衰落信道。将这种情况下的EIO容量与通信系统的EIO速率进行比较，在该通信系统中，接收器通过使用不匹配的最大似然（ML）解码器进行解码。还研究了速率限制反馈为发射机提供量化CSI的效果。

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