Diversity Analysis of Analog Network Coding with Multi-User Interferences

Network coding can improve the bandwidth efficiency by letting multiple users share the relay channels. However, the multi-user interferences (MUI) at the intended receiver may degrade the diversity performances. So in this work, we study several diversity strategies for the multiple-access relay ch...

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Vydané v:IEEE transactions on wireless communications Ročník 12; číslo 2; s. 668 - 679
Hlavní autori: Wei Guan, Liu, K. J. R.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York, NY IEEE 01.02.2013
Institute of Electrical and Electronics Engineers
Predmet:
Applied sciences
Coding, codes
diversity
Diversity methods
Diversity reception
Encoding
Exact sciences and technology
Information, signal and communications theory
interference
Network coding
Relays
Signal and communications theory
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Vectors
Wireless communication
wireless relaying
Performance evaluation
Multiple access
Block code
Relaying
Space-time codes
Packet switching
Design criterion
Relay
Maximin problem
Wireless telecommunication
wireless relaying
Controller area networks
Adaptive method
Optimal design
Upper bound
diversity
Relay channel
Minimax method
Network coding
Minimal distance
interference
Multiple channel
ISSN:1536-1276
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Popis
Shrnutí:Network coding can improve the bandwidth efficiency by letting multiple users share the relay channels. However, the multi-user interferences (MUI) at the intended receiver may degrade the diversity performances. So in this work, we study several diversity strategies for the multiple-access relay channel and analyze the impact of MUI on the diversity performances. Both the variable gain relaying (VGR) and the fixed gain relaying (FGR) are considered, where the relay nodes are subject to instantaneous power constraints and long-term power constraints, respectively. We first develop a Min-Max relay selection strategy and prove that full diversity can be achieved. Next, the distributed space-time block coding (DSTBC) and the diagonal distributed space-time coding (DDSTC) are studied. For DSTBC, we show that full diversity can be achieved by FGR, but the diversity of VGR is upper bounded by \min (L+1, K+1), where L and K are the number of relays and users, respectively. For single-user systems, we then develop a selective DSTBC-VGR scheme to recover the diversity loss by adaptively allocating the relay power. Finally for DDSTC, we show that both FGR and VGR can achieve full diversity, and the optimum code design criterion is to maximize the minimum product distance.
ISSN:1536-1276
DOI:10.1109/TWC.2012.121712.112232