Cooperative Two-Way Filter-and-Forward Beamforming for Frequency-Selective Channels

In this paper, we consider filter-and-forward beamforming (FF-BF) for two-way relay networks employing single-carrier transmission over frequency-selective channels. In FF-BF, the relay nodes filter the received signal using finite impulse response (FIR) or infinite impulse response (IIR) filters. F...

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Bibliographic Details
Published in:2011 IEEE International Conference on Communications (ICC) pp. 1 - 6
Main Authors: Liang, Yang-wen, Ikhlef, Aissa, Gerstacker, Wolfgang, Schober, Robert
Format: Conference Proceeding
Language:English
Published: IEEE 01.06.2011
Subjects:
Delay
Finite impulse response filter
Interference
Optimization
Relays
Signal to noise ratio
Transceivers
ISBN:9781612842325, 1612842321
ISSN:1550-3607
Online Access:Get full text
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Summary:In this paper, we consider filter-and-forward beamforming (FF-BF) for two-way relay networks employing single-carrier transmission over frequency-selective channels. In FF-BF, the relay nodes filter the received signal using finite impulse response (FIR) or infinite impulse response (IIR) filters. For the processing at the transceivers, we investigate two different cases: (1) simple slicing without equalization and (2) linear equalization. For both cases, we optimize FF-BF filters for maximization of the minimum transceiver signal-to-interference-plus-noise ratio (SINR) subject to a relay transmit power constraint. For case (1), we show that the optimization problem for FIR filters can be transformed into a convex second-order cone programming problem, which can be efficiently solved using standard tools. For case (2), leveraging results from IIR FF-BF for one-way relaying, we establish an upper and an achievable lower bound for the max-min problem. Since the gap between the upper and the lower bound is small, a close-to-optimal solution is obtained. Our simulation results reveal that the performance of FF-BF without equalization at the transceivers crucially depends on the slicer decision delay and transceivers with slicers can closely approach the performance of transceivers with equalizers provided that the FIR FF-BF filters are sufficiently long.
ISBN:9781612842325
1612842321
ISSN:1550-3607
DOI:10.1109/icc.2011.5962472