NDLI: Joint Relay Selection and Network Coding for Error-Prone Two-Way Decode-and-Forward Relay Networks

Content Provider	IEEE Xplore Digital Library
Author	Qimin You Yonghui Li Zhuo Chen
Copyright Year	1972
Abstract	In a two-way relay network (TWRN), the optimal joint relay selection (RS) and network coding (NC) (O-RS-NC) scheme, which searches all the relay combinations to select a best relay subset, requires high computational complexity and significant amount of feedback. To address this issue, two joint RS and NC (RS-NC) schemes, referred to as a joint single RS and NC (S-RS-NC) and a joint dual RS and NC (D-RS-NC), are proposed based on decode-and-forward (DF) protocol for error-prone TWRNs. Specifically, for the S-RS-NC scheme, a single relay is selected to minimize the sum bit error rate (BER) of the TWRN. The S-RS-NC scheme is simple to implement, but it suffers from a relatively large signal-to-noise ratio (SNR) loss compared to the O-RS-NC scheme. To reduce the SNR loss, a D-RS-NC scheme is proposed. In the D-RS-NC scheme, one or two relays are selected to minimize the sum BER of the network. Because the source and relay transmission powers (E_S and E_R) have different impacts on the equivalent SNR of the TWRN, the RS criterion is designed based on different ratios of E_S and E_R. BER lower-bounds for these schemes are derived and verified by simulations to be tight asymptotically. Both analytical and simulation results show that the proposed RS-NC schemes are superior to the conventional RS without NC scheme when 2E_S>E_R. In most practical applications, for example, a wireless sensor network, all the nodes transmit at the same power, where the proposed RS-NC schemes perform better than the conventional RS without NC scheme.
Starting Page	3420
Ending Page	3433
Page Count	14
File Size	777116
File Format	PDF
ISSN	00906778
Volume Number	62
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bit error rate Signal to noise ratio Joints Relay networks (telecommunications) Erbium Decoding relay selection Two-way relay networks bit error rate decode-and-forward network coding
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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