A Factor Graph Approach to Iterative Channel Estimation, Detection, and Decoding for Two-Path Successive Relay Networks | IEEE Journals & Magazine | IEEE Xplore

A Factor Graph Approach to Iterative Channel Estimation, Detection, and Decoding for Two-Path Successive Relay Networks


Abstract:

We consider cooperative communications between a source node and a destination node with the help of two relays. In order to overcome the half-duplex constraint, the ampl...Show More

Abstract:

We consider cooperative communications between a source node and a destination node with the help of two relays. In order to overcome the half-duplex constraint, the amplify-and-forward two-path relaying protocol is used. We adopt orthogonal frequency-division multiplexing modulation to combat frequency-selective channels and asynchronous reception at the destination node. In this paper, we develop a coherent receiver architecture suitable for unknown block fading channels. A factor graph representing the joint a posteriori probability of the coded symbols and the channels in the frequency domain is introduced. Then, we derive a Bayesian inference algorithm based on message passing over the factor graph. The resulting iterative receiver maintains low-complexity, based on the interaction between an off-the-shelf soft-input soft-output decoder and a newly introduced per-subcarrier processor for two-path relaying channel estimation and symbol detection. Simulation results show that the proposed solution maintains the full diversity order, even with a limited number of training blocks.
Published in: IEEE Transactions on Wireless Communications ( Volume: 15, Issue: 8, August 2016)
Page(s): 5414 - 5429
Date of Publication: 25 April 2016

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