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Virtual Full-Duplex Relaying With Half-Duplex Relays

机译：具有半双工中继的虚拟全双工中继

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摘要

We consider virtual full-duplex relaying by means of half-duplex relays. In this configuration, each relay stage in a multihop relaying network is formed by at least two relays, used alternatively in transmit and receive modes, such that while one relay transmits its signal to the next stage, the other relay receives a signal from the previous stage. With such a pipelined scheme, the source is active and sends a new information message in each time slot. We consider the achievable rates for various coding schemes and compare them with a cut-set upper bound, which is tight in certain conditions. We show that both lattice-based compute-and-forward (CoF) and quantize-map-and-forward (QMF) yield attractive performance and implementation. In particular, QMF in this context does not require long messages and joint (non-unique) decoding, if the quantization mean-square distortion at the relays is chosen appropriately. In addition, in the multihop case the gap of QMF from the cut-set upper bound grows logarithmically with the number of stages, and not linearly as in the case of noise level quantization. Furthermore, we show that CoF is particularly attractive in the case of multihop relaying, when the channel gains have fluctuations not larger than 3 dB, yielding a rate that does not depend on the number of relaying stages. In particular, we argue that such architecture may be useful for a wireless backhaul with line-of-sight propagation between the relays.
机译：我们考虑通过半双工中继进行虚拟全双工中继。在此配置中，多跳中继网络中的每个中继级由至少两个中继组成，可在发送和接收模式中交替使用，这样，当一个中继将其信号发送到下一级时，另一个中继从上一个中继接收信号阶段。使用这种流水线方案，源是活动的，并在每个时隙中发送新的信息消息。我们考虑了各种编码方案可达到的速率，并将它们与割集上限（在某些条件下比较严格）进行比较。我们表明，基于格的计算转发（CoF）和量化映射转发（QMF）均可产生诱人的性能和实现。特别是，如果适当选择了中继站的量化均方失真，则QMF在这种情况下不需要长消息和联合（非唯一）解码。此外，在多跳情况下，与截割集上限相距的QMF间隙与级数成对数增长，而不是像噪声级量化那样呈线性增长。此外，我们表明，在多跳中继的情况下，当信道增益的波动不大于3 dB时，CoF特别有吸引力，其速率不取决于中继级数。特别是，我们认为这种架构对于中继之间视线传播的无线回程可能很有用。

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