Power Allocation for Channel Estimation and Performance of Mismatched Decoding in Wireless Relay Networks

This paper is concerned with power allocation (PA) among the source and the relays of wireless relay networks to minimize the mean-square error (MSE) of the channel estimation when distributed space-time coding (DSTC) is applied. The optimal PA scheme is numerically obtained by means of geometric pr...

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Vydáno v:IEEE transactions on vehicular technology Ročník 59; číslo 9; s. 4639 - 4645
Hlavní autoři: Nguyen, Duy H N, Nguyen, Ha H
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York, NY IEEE 01.11.2010
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Allocations
Applied sciences
Channel estimation
Channels
Coding
Coding, codes
Connection and protection apparatus
Decoding
Detection, estimation, filtering, equalization, prediction
distributed space-time coding (DSTC)
diversity order
Electrical engineering. Electrical power engineering
Estimators
Exact sciences and technology
Exact solutions
geometric programming (GP)
Information, signal and communications theory
Mathematical analysis
power allocation (PA)
Relay
Relay networks
Relays
Signal and communications theory
Signal to noise ratio
Signal, noise
Space time codes
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Performance evaluation
Space-time codes
Parameter estimation
Relay
Relay network
Error estimation
Wireless telecommunication
Diversity
Programming
Power supply
Power allocation
Mean square error
Learning
diversity order
Coding
Least squares method
Channel estimation
Optimal planning
Estimation error
Estimator
power allocation (PA)
Power electronics
Decoding
Mismatching
geometric programming (GP)
distributed space-time coding (DSTC)
Wireless network
Gain
ISSN:0018-9545, 1939-9359
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Popis
Shrnutí:This paper is concerned with power allocation (PA) among the source and the relays of wireless relay networks to minimize the mean-square error (MSE) of the channel estimation when distributed space-time coding (DSTC) is applied. The optimal PA scheme is numerically obtained by means of geometric programming for the least-squares (LS) estimator, and a closed-form near-optimal PA scheme is also suggested. The impact of imperfect channel estimation on the error performance of DSTC is analyzed for both the LS and linear minimum MSE (LMMSE) channel estimators. It is proved that mismatched decoding of DSTC is able to achieve the same diversity order as coherent decoding of DSTC. Furthermore, when the closed-form PA obtained in the training phase is applied to the transmission phase, mismatched decoding is able to achieve a significant coding gain over the equal-PA scheme (which assigns half of the total power to the source and equally shares the other half to all the relays).
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2010.2080296