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Rate Allocation and Adaptation for Incremental Redundancy Truncated HARQ

机译:增量冗余截断HARQ的速率分配和适应

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This paper considers incremental redundancy hybrid ARQ (HARQ) transmission over independent block-fading channels. The transmitter, having no knowledge of the instantaneous channel state information (CSI) can or — allocate the transmission rate knowing the statistics of the channel, or — adapt the transmissions rates using the outdated CSI, i.e., the one experienced by the receiver in the past transmissions that resulted in a packet decoding failure. Aiming at throughput maximization problems under constraint on the outage probability, we show how to optimize the rate-adaptation and rate-allocation policies using dynamic programming framework. Numerical examples obtained in a Rayleigh-fading channel show that rate adaptation provides notable gains over a rate allocation and non-adaptive HARQ, and, for high SNR, only a few transmissions are necessary to approach closely the ergodic capacity.
机译:本文考虑了独立块衰落信道上的增量冗余混合ARQ(HARQ)传输。不了解瞬时信道状态信息(CSI)的发射机可以或-分配已知信道统计信息的传输速率,或-使用过时的CSI调整传输速率,即,接收机在信道中所经历的速率。过去导致数据包解码失败的传输。针对在中断概率约束下的吞吐量最大化问题,我们展示了如何使用动态规划框架来优化速率自适应和速率分配策略。在瑞利衰落信道中获得的数值示例表明,速率自适应在速率分配和非自适应HARQ上提供了显着的收益,并且,对于高SNR,仅需要进行少量传输就可以接近遍历容量。

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