Title :
Power Allocation Strategies for Distributed Space-Time Codes in Amplify-and-Forward Mode
Author :
Maham, Behrouz ; Hjorungnes, Are
Author_Institution :
UNIK, Univ. of Oslo, Oslo
Abstract :
The idea of space-time coding, devised for multiple-antenna systems, can be applied to communication over a wireless relay network. In this paper, we derive an approximate formula for the bit error rate (BER) of distributed space-time codes in amplify-and-forward (AF) mode, in which each relay transmits a scaled version of the linear combination of its received symbols. Assuming M-PSK or M-QAM modulated, full-rate, and full-diversity space-time codes, we derive two power allocation strategies minimizing the approximate BER expressions, for constrained transmit power. Our analytical results have been verified by simulation results.
Keywords :
error statistics; modulation coding; radio networks; space-time codes; amplify-and-forward mode; bit error rate; distributed space-time codes; multiple-antenna systems; power allocation strategies; space-time coding; wireless relay network; Antenna arrays; Bit error rate; Decoding; Fading; Power system relaying; Receiving antennas; Relays; Space time codes; Wireless communication; Wireless networks;
Conference_Titel :
Wireless Communications and Mobile Computing Conference, 2008. IWCMC '08. International
Conference_Location :
Crete Island
Print_ISBN :
978-1-4244-2201-2
Electronic_ISBN :
978-1-4244-2202-9
DOI :
10.1109/IWCMC.2008.156
