A novel design of physical layer network coding in strong asymmetric two-way relay channels

Wei, Hao; Zheng, Baoyu; Ji, Xiaodong

doi:10.1186/1687-1499-2013-166

Cited by 3 publications

(2 citation statements)

References 12 publications

(11 reference statements)

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“…However, when these methods are applied to asymmetric traffic conditions, lower energy efficiency is experienced. Several studies on bidirectional relay systems with asymmetric traffic have attempted to solve this issue [9][10][11][12][13]. An asymmetric modulation scheme that is capable of making full use of the stronger link to improve the overall transmission rate and ensures the reliability of the weaker link was proposed in [9].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies on bidirectional relay systems with asymmetric traffic have attempted to solve this issue [9][10][11][12][13]. An asymmetric modulation scheme that is capable of making full use of the stronger link to improve the overall transmission rate and ensures the reliability of the weaker link was proposed in [9]. In [10], a hierarchical modulation (HM)-based scheme and a hybrid-constellation-based relay scheme are considered to enhance the performance of asymmetric bidirectional relaying.…”

Section: Introductionmentioning

confidence: 99%

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An Energy-efficiency Approach for Bidirectional Amplified-and-forward Relaying with Asymmetric Traffic in OFDM Systems

2014

KSII TIIS

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Two-way relaying is an effective way of improving system spectral efficiency by making use of physical layer network coding. However, energy efficiency in OFDM-based bidirectional relaying with asymmetric traffic requirement has not been investigated. In this study, we focused on subcarrier transmission mode selection, bit loading, and power allocation in a multicarrier single amplified-and-forward relay system. In this scheme, each subcarrier can operate in two transmission modes: one-way relaying and two-way relaying. The problem is formulated as a mixed integer programming problem. We adopt a structural approximation optimization method that first decouples the original problem into two suboptimal problems with fixed subcarrier subsets and then finds the optimal subcarrier assignment subsets. Although the suboptimal problems are nonconvex, the results obtained for a single-tone system are used to transform them to convex problems. To find the optimal subcarrier assignment subsets, an iterative algorithm based on subcarrier ranking and matching is developed. Simulation results show that the proposed method can improve system performance compared with conventional methods. Some interesting insights are also obtained via simulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Energy-efficiency Approach for Bidirectional Amplified-and-forward Relaying with Asymmetric Traffic in OFDM Systems

2014

KSII TIIS

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Transmission Scheme for Asymmetric MIMO Two-way Relay with Channel Estimation Error

Fan¹,

Yuan²,

Xiao³

2015

IJHIT

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In this paper, we consider the transmission scheme for asymmetric decode-and-forward (DF) multi-input multi-output (MIMO) two-way relay system with channel estimation error. In order to transmit with asymmetric data rates from the relay to the receivers according to their individual link qualities, we propose a novel transmission scheme for the broadcast phase by employing a priori bit information. The proposed scheme employs multi-antenna and network coding at the relay. The idea is the weaker link receiver exploits a priori bit information in each transmit symbol, so that it only needs to decode on a subset of the transmit symbol constellation. Subject to the same bit error rate constraint, the weaker link receiver can decode at lower signal-to-noise ratio compared to the stronger link. The different signal labeling used for mapping bits to symbols at the relay cause different minimum Euclidean distance, so it is shown to be crucial for the performance at the receivers. Subsequently, we investigate the effect of the channel estimation error on the system performance. Simulations show that the proposed transmission scheme can be applied to practical scenarios with asymmetric channel qualities.

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Application of Alamouti Coding to Two-Way Relaying

Legnain¹

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A novel design of physical layer network coding in strong asymmetric two-way relay channels

Cited by 3 publications

References 12 publications

An Energy-efficiency Approach for Bidirectional Amplified-and-forward Relaying with Asymmetric Traffic in OFDM Systems

An Energy-efficiency Approach for Bidirectional Amplified-and-forward Relaying with Asymmetric Traffic in OFDM Systems

Transmission Scheme for Asymmetric MIMO Two-way Relay with Channel Estimation Error

Application of Alamouti Coding to Two-Way Relaying

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