Opportunistic Multiuser Two-Way Amplify-And-Forward Relaying with a Multiantenna Relay

Duckdong Hwang; Bruno Clerckx; Sung Sik Nam; Tae Jin Lee

doi:10.1109/TVT.2015.2443114

Opportunistic Multiuser Two-Way Amplify-And-Forward Relaying with a Multiantenna Relay

Duckdong Hwang, Bruno Clerckx, Sung Sik Nam, Tae Jin Lee

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We consider the opportunistic multiuser diversity in the multiuser two-way amplify-And-forward (AF) relay channel. The relay, which is equipped with multiple antennas and a simple zero-forcing beamforming (ZFBF) scheme, selects a set of two way relaying user pairs to enhance the degree of freedom (DoF) and, consequently, the sum throughput of the system. The proposed channel-Aligned pair scheduling (CAPS) algorithm reduces the interpair interference and keeps the signal-To-interference-plus-noise-power ratio (SINR) of user pairs that are interference-free when the number of user pairs becomes very large. When the number of user pairs grows fast enough with the system signal-To-noise ratio (SNR), a DoF equal to the number of relay antennas can be achieved. For a realistic number of user pairs, we propose an adaptive CAPS and an adaptive semi-orthogonal CAPS (SCAPS) to improve performance. Simulation results show that adaptive CAPS and adaptive SCAPS provide throughput gain in the low-To-mid SNR region.

Original language	English
Article number	7120995
Pages (from-to)	3777-3782
Number of pages	6
Journal	IEEE Transactions on Vehicular Technology
Volume	65
Issue number	5
DOIs	https://doi.org/10.1109/TVT.2015.2443114
Publication status	Published - 2016 May

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea funded by the Korean Ministry of Science, ICT, and Future Planning under Grant 2014R1A5A1011478.

Publisher Copyright:
© 1967-2012 IEEE.

Keywords

Two-way relaying
amplify and forward
degree of freedom
opportunistic user pair selection

ASJC Scopus subject areas

Automotive Engineering
Aerospace Engineering
Electrical and Electronic Engineering
Applied Mathematics

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10.1109/TVT.2015.2443114

Cite this

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title = "Opportunistic Multiuser Two-Way Amplify-And-Forward Relaying with a Multiantenna Relay",

abstract = "We consider the opportunistic multiuser diversity in the multiuser two-way amplify-And-forward (AF) relay channel. The relay, which is equipped with multiple antennas and a simple zero-forcing beamforming (ZFBF) scheme, selects a set of two way relaying user pairs to enhance the degree of freedom (DoF) and, consequently, the sum throughput of the system. The proposed channel-Aligned pair scheduling (CAPS) algorithm reduces the interpair interference and keeps the signal-To-interference-plus-noise-power ratio (SINR) of user pairs that are interference-free when the number of user pairs becomes very large. When the number of user pairs grows fast enough with the system signal-To-noise ratio (SNR), a DoF equal to the number of relay antennas can be achieved. For a realistic number of user pairs, we propose an adaptive CAPS and an adaptive semi-orthogonal CAPS (SCAPS) to improve performance. Simulation results show that adaptive CAPS and adaptive SCAPS provide throughput gain in the low-To-mid SNR region.",

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N2 - We consider the opportunistic multiuser diversity in the multiuser two-way amplify-And-forward (AF) relay channel. The relay, which is equipped with multiple antennas and a simple zero-forcing beamforming (ZFBF) scheme, selects a set of two way relaying user pairs to enhance the degree of freedom (DoF) and, consequently, the sum throughput of the system. The proposed channel-Aligned pair scheduling (CAPS) algorithm reduces the interpair interference and keeps the signal-To-interference-plus-noise-power ratio (SINR) of user pairs that are interference-free when the number of user pairs becomes very large. When the number of user pairs grows fast enough with the system signal-To-noise ratio (SNR), a DoF equal to the number of relay antennas can be achieved. For a realistic number of user pairs, we propose an adaptive CAPS and an adaptive semi-orthogonal CAPS (SCAPS) to improve performance. Simulation results show that adaptive CAPS and adaptive SCAPS provide throughput gain in the low-To-mid SNR region.

AB - We consider the opportunistic multiuser diversity in the multiuser two-way amplify-And-forward (AF) relay channel. The relay, which is equipped with multiple antennas and a simple zero-forcing beamforming (ZFBF) scheme, selects a set of two way relaying user pairs to enhance the degree of freedom (DoF) and, consequently, the sum throughput of the system. The proposed channel-Aligned pair scheduling (CAPS) algorithm reduces the interpair interference and keeps the signal-To-interference-plus-noise-power ratio (SINR) of user pairs that are interference-free when the number of user pairs becomes very large. When the number of user pairs grows fast enough with the system signal-To-noise ratio (SNR), a DoF equal to the number of relay antennas can be achieved. For a realistic number of user pairs, we propose an adaptive CAPS and an adaptive semi-orthogonal CAPS (SCAPS) to improve performance. Simulation results show that adaptive CAPS and adaptive SCAPS provide throughput gain in the low-To-mid SNR region.

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Opportunistic Multiuser Two-Way Amplify-And-Forward Relaying with a Multiantenna Relay

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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