Optimal beamforming for two-way multi-antenna relay channel with analogue network coding

By Rui Zhang, Ying-Chang Liang, Chin Choy Chai. IEEE Journal on Selected Areas in Communications, 2008

605 citations recorded by the source corpus.

This paper studies the wireless two-way relay channel (TWRC), where two source nodes, S1 and S2, exchange information through an assisting relay node, R. It is assumed that R receives the sum signal from S1 and S2 in one timeslot, and then amplifies and forwards the received signal to both S1 and S2 in the next time-slot. By applying the principle of analogue network coding (ANC), each of S1 and S2 cancels the so-called "self-interference" in the received signal from R and then decodes the desired message. Assuming that S1 and S2 are each equipped with a single antenna and R with multi-antennas, this paper analyzes the capacity region of the ANC-based TWRC with linear processing (beamforming) at R. The capacity region contains all the achievable bidirectional rate-pairs of S1 and S2 under the given transmit power constraints at S1, S2, and R. We present the optimal relay beamforming structure as well as an efficient algorithm to compute the optimal beamforming matrix based on convex optimization techniques. Low-complexity suboptimal relay beamforming schemes are also presented, and their achievable rates are compared against the capacity with the optimal scheme.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/bba8a5e2808cd472c8253f07eb4d660b1be6da18

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Citations in the corpus

Multiuser Two-Way Amplify-and-Forward Relay Processing and Power Control Methods for Beamforming Systems (2010, background): “Distributed space-time coding for multiple single-antenna re-lays was realized in partial decode-and-forward protocol in [14], and optimal beamforming for two-way relay communications was presented in [15].”
Optimal Distributed Beamforming for Two-Way Relay Networks (2010, methodology): “A straightforward approach to avoid interference at the relays and at the transceivers is to deploy two successive one-way relaying schemes, as shown in Fig.”
Physical-layer network coding: Tutorial, survey, and beyond (2011, background): “[50,51] investigated MIMO ANC schemes in which the relay has multiple antennas and the end nodes have single antenna.”
A Survey on Multiple-Antenna Techniques for Physical Layer Security (2017, methodology): “To effectively exploit the benefits of two-way half-duplex relaying, a common method is to adopt network coding [147], [148].”
Intelligent Reflecting Surface: A Programmable Wireless Environment for Physical Layer Security (2019, background): “Compared with the existing related techniques, i.e., traditional reﬂecting surfaces [7], amplify-and-forward (AF) relay [8], active intelligent surface [9], and backscatter communication [10]–[12], IRS has the following advantages [13], [14].”