Abstract
This paper deals with the power allocation problem in a wireless relay network employing differential modulation technique and Alamouti distributed space-time code, where signals from both the direct and relay paths are taken into account in the detection process. We propose a sub-optimal power allocation scheme based on the maximization of an approximate receive covariance expression. The proposed scheme jointly allocates the transmit power of both the source and relay nodes under a total transmit power and per-node transmit power constraints. We can increase the effectiveness of the proposed power allocation algorithm by grouping the relays with respect to their individual covariances. Numerical experiments show that the proposed covariance maximization algorithm combined with the relay grouping algorithm offers a respectable BER performance improvement, compared to the conventional schemes. Finally, we demonstrate that the proposed scheme requires only a small number of iterations to achieve convergence, making it attractive to practical systems.
| Original language | English |
|---|---|
| Article number | 6155554 |
| Pages (from-to) | 1468-1477 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 11 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2012 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics
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Joint power allocation for differentially modulated wireless relay networks. / Pambudi, Sigit Aryo; Lee, Bumsoo; Lee, Chungyong.
In: IEEE Transactions on Wireless Communications, Vol. 11, No. 4, 6155554, 01.04.2012, p. 1468-1477.Research output: Contribution to journal › Article
TY - JOUR
T1 - Joint power allocation for differentially modulated wireless relay networks
AU - Pambudi, Sigit Aryo
AU - Lee, Bumsoo
AU - Lee, Chungyong
PY - 2012/4/1
Y1 - 2012/4/1
N2 - This paper deals with the power allocation problem in a wireless relay network employing differential modulation technique and Alamouti distributed space-time code, where signals from both the direct and relay paths are taken into account in the detection process. We propose a sub-optimal power allocation scheme based on the maximization of an approximate receive covariance expression. The proposed scheme jointly allocates the transmit power of both the source and relay nodes under a total transmit power and per-node transmit power constraints. We can increase the effectiveness of the proposed power allocation algorithm by grouping the relays with respect to their individual covariances. Numerical experiments show that the proposed covariance maximization algorithm combined with the relay grouping algorithm offers a respectable BER performance improvement, compared to the conventional schemes. Finally, we demonstrate that the proposed scheme requires only a small number of iterations to achieve convergence, making it attractive to practical systems.
AB - This paper deals with the power allocation problem in a wireless relay network employing differential modulation technique and Alamouti distributed space-time code, where signals from both the direct and relay paths are taken into account in the detection process. We propose a sub-optimal power allocation scheme based on the maximization of an approximate receive covariance expression. The proposed scheme jointly allocates the transmit power of both the source and relay nodes under a total transmit power and per-node transmit power constraints. We can increase the effectiveness of the proposed power allocation algorithm by grouping the relays with respect to their individual covariances. Numerical experiments show that the proposed covariance maximization algorithm combined with the relay grouping algorithm offers a respectable BER performance improvement, compared to the conventional schemes. Finally, we demonstrate that the proposed scheme requires only a small number of iterations to achieve convergence, making it attractive to practical systems.
UR - http://www.scopus.com/inward/record.url?scp=84862801062&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84862801062&partnerID=8YFLogxK
U2 - 10.1109/TWC.2012.021512.111037
DO - 10.1109/TWC.2012.021512.111037
M3 - Article
AN - SCOPUS:84862801062
VL - 11
SP - 1468
EP - 1477
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 4
M1 - 6155554
ER -