An Optimal Full-Duplex AF Relay for Joint Analog and Digital Domain Self-Interference Cancellation

In this paper, a full-duplex (FD) amplify-and-forward (AF) relay is designed to compensate for the duplexing loss of the half-duplex (HD) AF relay. In particular, when there is no direct link between a source and a destination, joint analog domain self-interference suppression and digital domain res...

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Vydáno v:IEEE transactions on communications Ročník 62; číslo 8; s. 2758 - 2772
Hlavní autoři: Kang, Young Yun, Kwak, Byung-Jae, Cho, Joon Ho
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.08.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Algorithms
Amplifiers
Antennas
Array signal processing
Cancellation
Communication channels
Computing time
Digital
Interference
Mobile communication
Noise
Optimization
Partitioning
Receiving antennas
Relay
Relays
Vectors
self-interference cancellation
Full-duplex relay
nonconvex quadratically constrained quadratic programming
amplify-and-forward relay
ISSN:0090-6778, 1558-0857
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Shrnutí:In this paper, a full-duplex (FD) amplify-and-forward (AF) relay is designed to compensate for the duplexing loss of the half-duplex (HD) AF relay. In particular, when there is no direct link between a source and a destination, joint analog domain self-interference suppression and digital domain residual self-interference cancellation is considered with an FD-AF relay having single receive antenna but multiple transmit antennas. Unlike previous approaches, a nonconvex quadratically constrained quadratic programming problem is formulated to find the optimal solution. The end-to-end spectral efficiency or, equivalently, the end-to-end signal-to-interference-plus-noise ratio from the source to the destination is chosen as the objective function to be maximized subject to the average transmit power constraint at the relay. In addition, an average power constraint is imposed on the output of the relay's receive antenna to avoid the nonlinear distortion in the low noise amplifier and the excessive quantization noise in the analog-to-digital converter. Through the systematic reduction and the partitioning of the constraint set, the optimal solution is derived in a closed algorithmic expression and shows how it allocates the transmission power not only in the direction of maximal performance improvement but also in the orthogonal direction in order to balance the system performance and the amount of self interference. It is shown that the optimal FD-AF relay significantly outperforms the optimal HD-AF relay even with the hardware limitations in the RF chain of the relay's receiver being well taken into account.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2014.2342230