Optimally Joint Subcarrier Pairing and Power Allocation for OFDM System with Multihop Symbol Level DF Relaying

Ning WANG  Tingting MIAO  Hongwen YANG  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.12   pp.2800-2808
Publication Date: 2014/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.2800
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
OFDM,  multi-hop,  decode-and-forward,  subcarrier pairing,  power allocation,  

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Subcarrier pairing (SP) and power allocation (PA) can improve the channel capacity of the OFDM multi-hop relay system. Due to limitations of processing complexity and energy consumption, symbol-level relaying, which only regenerates the constellation symbols at relay nodes, is more practical than code-level relaying that requires full decoding and encoding. By modeling multi-hop symbol-level relaying as a multi-staged parallel binary symmetric channel, this paper introduces a jointly optimal SP and PA scheme which maximizes the end to end data rate. Analytical arguments are given to reveal the structures and properties of the optimal solution, and simulation results are presented to illustrate and justify the optimality.