Multi-Hop Relaying: An End-to-End Delay Analysis

作者：Chaaban Anas^*; Sezgin Aydin^*

来源：IEEE Transactions on Wireless Communications, 2016, 15(4): 2552-2561.

DOI：10.1109/TWC.2015.2504528

• Amplify-forward
• backward-decoding
• block-coding
• communication latency
• decode-forward
• relay channel

The impact of multi-hopping schemes on the communication latency in a relay channel is studied. The main aim is to characterize conditions under which such schemes decrease the communication latency given a reliability requirement. Both decode-forward (DF) and amplify-forward (AF) with block coding are considered, and are compared with the point-to-point (P2P) scheme which ignores the relay. Latency expressions for the three schemes are derived, and conditions under which DF and AF reduce latency are obtained for high signal-to-noise ratio (SNR). Interestingly, these conditions are more strict when compared to the conditions under which the same multi-hopping schemes achieve higher long-term (information-theoretic) rates than P2P. It turns out that the relation between the source-destination SNR and the harmonic mean of the SNR's of the channels to and from the relay dictates whether multi-hopping reduces latency or not.

• 出版日期2016-4
• 单位KAUST