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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Vydané v:2011 IEEE International Conference on Communications (ICC) s. 1 - 6
Hlavní autori: Liang, Yang-wen, Ikhlef, Aissa, Gerstacker, Wolfgang, Schober, Robert
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 01.06.2011
Predmet:
Delay
Finite impulse response filter
Interference
Optimization
Relays
Signal to noise ratio
Transceivers
ISBN:9781612842325, 1612842321
ISSN:1550-3607
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Abstract 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.
AbstractList 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.
Author Gerstacker, Wolfgang
Schober, Robert
Ikhlef, Aissa
Liang, Yang-wen
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  givenname: Aissa
  surname: Ikhlef
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  givenname: Wolfgang
  surname: Gerstacker
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  email: gersta@LNT.de
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  givenname: Robert
  surname: Schober
  fullname: Schober, Robert
  email: rschober@ece.ubc.ca
  organization: Dept. of Elec. & Comp. Eng., Univ. of British Columbia, Vancouver, BC, Canada
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Snippet In this paper, we consider filter-and-forward beamforming (FF-BF) for two-way relay networks employing single-carrier transmission over frequency-selective...
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StartPage 1
SubjectTerms Delay
Finite impulse response filter
Interference
Optimization
Relays
Signal to noise ratio
Transceivers
Title Cooperative Two-Way Filter-and-Forward Beamforming for Frequency-Selective Channels
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