Noncoherent Two-Way Relaying With Decode and Forward: Two Versus Three Phases

Noncoherent two- and three-phase two-way relaying (TWR) techniques are bandwidth efficient and entail no pilot symbol-related rate loss. However, noncoherent two-phase TWR (2P-TWR) has not been compared with three-phase TWR (3P-TWR), and several unanswered questions remain. In this paper, we focus o...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2022-03, Vol.71 (3), p.3350-3354
Main Authors: Wei, Ruey-Yi, Chin, Wan-Ying, Feng, Tian-Yu
Format: Article
Language:English
Subjects:
Binary phase shift keying
Constellation diagram
Differential encoding
Encoding
Error probability
Maximum likelihood decoding
MIMO communication
MPSK
Network coding
noncoherent detection
physical-layer network coding
Questions
Relay
Relaying
Relays
two-way relaying
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Summary:Noncoherent two- and three-phase two-way relaying (TWR) techniques are bandwidth efficient and entail no pilot symbol-related rate loss. However, noncoherent two-phase TWR (2P-TWR) has not been compared with three-phase TWR (3P-TWR), and several unanswered questions remain. In this paper, we focus on the noncoherent detection of the relay with the decode-and-forward technique. For the noncoherent maximum-likelihood detector at the relay, we propose a distance measure for the transmitted signals of the two terminal nodes. For 2P-TWR, we propose that the signal constellation of one terminal node is the signal constellation of the other terminal node rotated by an angle. Using the proposed distance measure, we obtain the optimal angles and thus resolve those unanswered questions pertaining to 2P-TWR. Finally, noncoherent 3P-TWR was found to significantly outperform noncoherent 2P-TWR in simulations and distance analyses.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2022.3144440