Abstract
In this paper, we investigate the optimal power allocation scheme for relay networks with finite-alphabet constraints. It has been shown that the previous work utilizing various design criteria with the Gaussian inputs assumption may lead to significant loss for a practical system with finite constellation set constraint, especially when signal-to-noise ratio (SNR) is in medium-to-high regions, or when the channel coding rate is medium to high. an optimal power allocation scheme is proposed to maximize the mutual information for the relay networks under discrete-constellation input constraint. Numerical examples show that significant gain can be obtained compared to the conventional counterpart for nonfading channels and fading channels. at the same time, we show that the large performance gain on the mutual information will also represent the large gain on the bit error rate (BER), i.e., the benefit of the power allocation scheme predicted by the mutual information can indeed be harvested and can provide considerable performance gain in a practical system. ©2010 IEEE.
Recommended Citation
W. Zeng et al., "On the Power Allocation for Relay Networks with Finite-alphabet Constraints," GLOBECOM - IEEE Global Telecommunications Conference, article no. 5684332, Institute of Electrical and Electronics Engineers, Jan 2010.
The definitive version is available at https://doi.org/10.1109/GLOCOM.2010.5684332
Department(s)
Electrical and Computer Engineering
International Standard Book Number (ISBN)
978-142445638-3
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2010
