Reliability-based Detection of Variable-rate Space-time Block Codes
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Authors
Kiarashi, Nooshin
Date
2008-09-27T15:46:22Z
Type
thesis
Language
eng
Keyword
Wireless Communications , Variable-Rate Space-Time Block Codes , MIMO Systems , Near-ML Detection
Alternative Title
Abstract
We present a new sub-optimal near-maximum-likelihood (ML) detection
method for the family of variable-rate space-time block codes
(VRSTBC). The proposed detection method is based on the concept of
symbol reliability and provides a wide range of
performance-complexity trade-offs. The reliability measures are
defined with the help of a recent generic ML metric expression. The
error performance and complexity analysis of the method via
simulations show an achievable near-ML error performance with
significant reduction in complexity. The performance of the proposed
method is also compared with the group interference cancellation
(GIC) method which was the detection method originally applied to
VRSTBCs and the results show a significant improvement. The new
method offers various levels of error protection via a simple
parameter and hence can provide the users of a wireless network with
different performance levels according to their cost allowance.
Unequal error protection by VRSTBCs under the new detection method
was explored. Several applications integrating data with different
levels of sensitivity to error can benefit from the wide range of
possibilities that the combination of the proposed detection method
and VRSTBCs provides. To further explore these flexibilities, four
practically interesting power allocation schemes were applied to the
transmission and the behaviors were observed through case studies.
Description
Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2008-09-26 23:45:07.81
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This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.