Transmission Protocol Design for Binary Physical Network Coded Multi-Way Relay Networks

Chang, Ronald Y.; Lin, Sian-Jheng; Chung, Wei-Ho

doi:10.1109/vtcspring.2014.7023129

Cited by 3 publications

(2 citation statements)

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“…In [27], the multiway relay network is decomposed into smaller building blocks, or atoms, over which existing TWRC techniques can be applied. In [28], a similar concept is considered where an opportunistic transmission protocol selects pairs of users for sequential transmission. Nonetheless, these approaches require at least N − 1 time slots for up-link transmission in an N -way relay channel.…”

Section: Introductionmentioning

confidence: 99%

Efficient Detection Scheme for Physical-Layer Network Coding in Multiway Relay Channels

Chang

Champagne

2019

IEEE Access

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In this paper, we propose a novel scheme for physical-layer network coding (PNC) in multiway relay channels (MWRC) from the perspective of sequential multiuser detection. We consider an uplink MWRC scenario where N users, each equipped with a single antenna, simultaneously transmit their signal to a relay equipped with K antennas (K < N ). Extraction of the network codes from the superimposed user signals at the relay node is formulated as an under-determined linear system. To solve this problem with low decoding complexity, the proposed method combines successive interference cancellation (SIC) with Babai estimation for regularized integer least squares (ILS). Specifically, SIC decoding is first employed to detect a selected subset of stronger user signals and remove their interfering effects. Babai estimation is then applied to extract the remaining user signals, which is formulated as an ILS problem with reduced dimension. We develop a power allocation scheme to enhance the performance of both SIC and ILS steps, and discuss an optimal user pairing strategy based on the average decoding error probability. Numerical results demonstrate the performance improvement of the proposed method in extracting network codes from multiple superimposed user signals.INDEX TERMS Babai estimation, multiway relay channel (MWRC), physical-layer network coding (PNC), successive interference cancellation (SIC).

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Section: Introductionmentioning

confidence: 99%

Efficient Detection Scheme for Physical-Layer Network Coding in Multiway Relay Channels

Chang

Champagne

2019

IEEE Access

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“…Several works studied different multiple access schemes to achieve MWRC. For example, in [12,13] authors present a transmission method that uses binary phase-shift keying (BPSK), where multiuser detection (MUD) is achieved at the expense of an increase of channel use by identifying "minority" nodes. In [14], MUD relies on iterative multiuser detection of users at the receiver.…”

Section: Introductionmentioning

confidence: 99%

Multiway Physical‐Layer Network Coding via Uniquely Decodable Codes

Kulhandjian

D’Amours

Kulhandjian

2018

Wireless Communications and Mobile Computing

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We focus on a multiway relay channel (MWRC) network where two or more users simultaneously exchange information with each other through the help of a relay node. We propose for the first time to apply ternary uniquely decodable (UD) code sets that we have developed to allow each user to uniquely recover the information bits from the noisy channel environment. One of the key features of the proposed scheme is that it utilizes a very simple decoding algorithm, which requires only a few logical comparisons. Simulation results in terms of bit error rate (BER) demonstrate that the performance of the proposed decoder is almost as good as the maximum-likelihood (ML) decoder. In addition to that through simulations, we show that the proposed scheme can significantly improve the sum-rate capacity, which in turn can potentially improve overall throughput, as it needs only two time slots (TSs) to exchange information compared to the conventional methods.

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