On the performance of distributed space-time coding systems with one and two non-regenerative relays

Spatial diversity can be induced by using wireless relay stations, which cooperate by amplifying and retransmitting the information received from a source to a destination station. In this context we propose a distributed space-time coding (DSTC) system based on the Alamouti codes. We characterize t...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 5; H. 3; S. 682 - 692
Hauptverfasser: Anghel, P.A., Kaveh, M.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Piscataway, NJ IEEE 01.03.2006
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Amplification
Applied sciences
Asymptotic properties
Bandwidth
Channels
Codes
Coding
Convolution
Convolutional codes
Cooperative systems
Error analysis
Error probability
Errors
Exact sciences and technology
Information rates
Mathematical models
Optimization
Power system relaying
Relays
Signal to noise ratio
Studies
Symbols
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Performance evaluation
Space-time codes
Relay
Bit error rate
Wireless telecommunication
Space diversity
Cooperative systems
Information rate
Mobile communication
Regenerative process
Power allocation
Information transmission
relay channel
diversity methods
Numerical simulation
Symbol error rate
Signal to noise ratio
ISSN:1536-1276, 1558-2248
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Zusammenfassung:Spatial diversity can be induced by using wireless relay stations, which cooperate by amplifying and retransmitting the information received from a source to a destination station. In this context we propose a distributed space-time coding (DSTC) system based on the Alamouti codes. We characterize the symbol error rate of systems with one and two non-regenerative relays using bounds and high signal-to-noise ratio (SNR) approximations. The asymptotic (high SNR) symbol error probability formulas are used to optimize the power allocation in the DSTC system. Furthermore, using the asymptotic symbol error probability formulas we argue that the DSTC system has at least 1.5 times the diversity achieved by point-to-point transmissions with the same bandwidth. Simulations show not only that the DSTC outperforms the amplify-and-forward cooperative system with orthogonal transmissions, but also convolutional encoded one-hop transmissions with the same information rate as the DSTC system. Assuming full channel knowledge at the source and the relays, we find an optimum cooperative system by minimizing the bit error rate of the DSTC system with one and two non-regenerative relays subject to fixed transmit energy constraints at each radio. Numerical results show that the DSTC system with two relays performs very close to the optimum cooperative system.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2006.1611099