Power Allocation and Error Performance of Distributed Unitary Space-Time Modulation in Wireless Relay Networks

A wireless relay network allows relays to cooperate with each other, emulate a virtual array of transmit antennas, and perform distributed space-time modulation of the source signals. In this paper, two types of relay networks are considered-one with no channel state information (CSI) (i.e., the non...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2009-09, Vol.58 (7), p.3333-3346
Main Authors: Nguyen, D.H.N., Nguyen, H.H., Hoang Duong Tuan
Format: Article
Language:English
Subjects:
Amount of fading
Antenna arrays
Antennas
Applied sciences
Asymptotic properties
Channel state information
Channels
Coherence
Communication channels
Connection and protection apparatus
Councils
Detectors
distributed space-time coding (DSTC)
Electrical engineering. Electrical power engineering
Errors
Exact sciences and technology
Fading
Information, signal and communications theory
Modulation
Modulation, demodulation
Networks
power allocation (PA)
Protocols
Radiocommunications
Relay networks
Relays
Signal and communications theory
Strontium
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitting antennas
unitary space-time modulation (USTM)
Wireless networks
wireless relay networks
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Summary:A wireless relay network allows relays to cooperate with each other, emulate a virtual array of transmit antennas, and perform distributed space-time modulation of the source signals. In this paper, two types of relay networks are considered-one with no channel state information (CSI) (i.e., the noncoherent networks) and one with only the information of the relay-to-destination channels (i.e., the partially coherent networks) at the destination. First, a new optimal power-allocation (PA) scheme is derived to maximize the average signal-to-noise ratio (SNR) at the destination while minimizing the amount of fading experienced over the network. Second, the Fourier-based unitary space-time modulation (USTM), which was originally proposed for multiple colocated transmit antennas, is applied to wireless relay networks. The receivers for such distributed USTM over noncoherent and partially coherent networks are developed, and their error performances are shown to be asymptotically the same. The impact of different PA schemes on the error performance of distributed USTM is thoroughly illustrated with simulation results.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2009.2013631