Practical physical layer network coding for two-way relay channels: performance analysis and comparison

This paper investigates the performance of practical physical-layer network coding (PNC) schemes for two-way relay channels. We first consider a network consisting of two source nodes and a single relay node, which is used to aid communication between the two source nodes. For this scenario, we inve...

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Vydáno v:IEEE transactions on wireless communications Ročník 9; číslo 2; s. 764 - 777
Hlavní autoři: Louie, R.H.Y., Yonghui Li, Vucetic, B.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York, NY IEEE 01.02.2010
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Applied sciences
Bit error rate
Channels
Coding
Coding, codes
Decoding
Digital relays
Error analysis
Exact sciences and technology
Exact solutions
Frame relay
Information, signal and communications theory
Mathematical analysis
Network coding
Networks
Performance analysis
Physical layer
physical-layer network coding
Power system relaying
Protocols
Rayleigh channels
Relay
Relaying
Signal and communications theory
Telecommunications and information theory
Two-way relaying
Wireless communication
Performance evaluation
Two-way relaying
Relaying
physical-layer network coding
Relay
Relay channel
Outage
Coding
Bit error rate
Two channel system
Transmission time
ISSN:1536-1276, 1558-2248
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Shrnutí:This paper investigates the performance of practical physical-layer network coding (PNC) schemes for two-way relay channels. We first consider a network consisting of two source nodes and a single relay node, which is used to aid communication between the two source nodes. For this scenario, we investigate transmission over two, three or four time slots. We show that the two time slot PNC scheme offers a higher maximum sum-rate, but a lower sum-bit error rate (BER) than the four time slot transmission scheme for a number of practical scenarios. We also show that the three time slot PNC scheme offers a good compromise between the two and four time slot transmission schemes, and also achieves the best maximum sum-rate and/or sum-BER in certain practical scenarios. To facilitate comparison, we derive new closed-form expressions for the outage probability, maximum sum-rate and sum-BER. We also consider an opportunistic relaying scheme for a network with multiple relay nodes, where a single relay is chosen to maximize either the maximum sum-rate or minimize the sum-BER. Our results indicate that the opportunistic relaying scheme can significantly improve system performance, compared to a single relay network.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2010.02.090314