Full Diversity Physical-Layer Network Coding in Two-Way Relay Channels With Multiple Antennas

This paper studies a two-way relay channel where two single-antenna users exchange messages via a relay with K antennas. A new physical-layer network coding (PNC) method is proposed, referred to as channel-quantized PNC (CQ-PNC), that can achieve full diversity gain of K. The proposed method convert...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 13; no. 8; pp. 4273 - 4282
Main Authors: Shengli Zhang, Zhou, Qing F., Caihong Kai, Wei Zhang
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.08.2014
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antennas
Applied sciences
Channels
Coding
Complexity theory
Exact sciences and technology
Gain
Interference
Messages
MIMO
Network coding
Networks
Quantization (signal)
Radiocommunications
Relay
Relays
Switching and signalling
Synchronism
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
two-way relay channel (TWRC)
physical-layer network coding (PNC)
multiple-input multiple-output (MIMO)
Full diversity
Performance evaluation
MIMO system
Packet switching
Relay
Quantization error
Two channel system
Synchronization
Computational complexity
Relay channel
Simulation
Quantized signal
QR factorization
Network coding
Signal conversion
Multiple channel
Antenna array
Antenna
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Description
Summary:This paper studies a two-way relay channel where two single-antenna users exchange messages via a relay with K antennas. A new physical-layer network coding (PNC) method is proposed, referred to as channel-quantized PNC (CQ-PNC), that can achieve full diversity gain of K. The proposed method converts K received signals at the relay into two signals by a QR decomposition. The first one is a weighted summation of the two users' messages and the second one is a scaled version of one user's message. Then, the first signal is quantized at the relay by using the channel coefficient and the quantization error is cancelled by using the side information of the second signal. Finally, a Gaussian-integer weighted summation of the two users' messages is obtained, mapped to network codeword, and then broadcast to the two users. It is proved that the proposed CQ-PNC can achieve the full diversity gain of K with receiver side channel information, low computational complexity and symbol level synchronization. Simulation results demonstrate that the proposed method obtains optimum performance results with negligible gap.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2014.2314122