TY - GEN
T1 - Power allocation in cooperative networks using differential space-time codes
AU - Maham, Behrouz
AU - Hjørungnes, Are
PY - 2007/12/1
Y1 - 2007/12/1
N2 - Estimating channel state information (CSI) in the fast fading conditions is very challenging. In this paper, a simple structure for cooperative diversity in decode-and-forward mode is examined, in which the transmitter, the relay and the receiver do not require to know CSI. In this scheme, transmission of information is done in a two phase process. In the first phase, differential modulated signals are radiated from the source. After decoding the received signal in the relay side, the source and the relay collectively send information using differential space-time codes. The optimum power allocation in a sense of minimizing pairwise error probability (PEP) in high SNR scenarios has been obtained using an analytical method. An interesting property of the optimum point is that it is independent of the channel statistics and the position of the relay, which improves its feasibility in the future communication systems. Numerical simulations verify the analytical results.
AB - Estimating channel state information (CSI) in the fast fading conditions is very challenging. In this paper, a simple structure for cooperative diversity in decode-and-forward mode is examined, in which the transmitter, the relay and the receiver do not require to know CSI. In this scheme, transmission of information is done in a two phase process. In the first phase, differential modulated signals are radiated from the source. After decoding the received signal in the relay side, the source and the relay collectively send information using differential space-time codes. The optimum power allocation in a sense of minimizing pairwise error probability (PEP) in high SNR scenarios has been obtained using an analytical method. An interesting property of the optimum point is that it is independent of the channel statistics and the position of the relay, which improves its feasibility in the future communication systems. Numerical simulations verify the analytical results.
KW - Cooperation
KW - Decode-and-forward
KW - Differential space-time codes
KW - Power control
UR - http://www.scopus.com/inward/record.url?scp=47749086944&partnerID=8YFLogxK
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U2 - 10.1109/ISIT.2007.4557501
DO - 10.1109/ISIT.2007.4557501
M3 - Conference contribution
AN - SCOPUS:47749086944
SN - 1424414296
SN - 9781424414291
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 1916
EP - 1919
BT - Proceedings - 2007 IEEE International Symposium on Information Theory, ISIT 2007
T2 - 2007 IEEE International Symposium on Information Theory, ISIT 2007
Y2 - 24 June 2007 through 29 June 2007
ER -