Power adaptation for BPSK signaling with average and peak power constraints in Rayleigh fading channels
Ye Hoon Lee
Bar-Ness, Y.
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA;
This paper appears in: Communications, IEEE Transactions on
Publication Date: Nov. 2003
Volume: 51,
Issue: 11
On page(s): 1871- 1876
ISSN: 0090-6778
INSPEC Accession Number: 7800533
Digital Object Identifier: 10.1109/TCOMM.2003.819203
Current Version Published: 2003-11-17
Abstract
We consider power adaptation strategies for binary phase-shift keying signals in Rayleigh fading channels under the assumption that channel state information is provided at both the transmitter and the receiver. We first derive a closed-form expression for the optimal power adaptation that minimizes average bit-error rate (BER) subject to average and peak transmission power constraints. Then, we analyze the average BER for channel inversion power adaptation with the same constraints. Our results show that the performance difference between the optimal power adaptation and the channel inversion becomes negligibly small as available average transmission power increases and/or peak-to-average power ratio decreases. We also find that an optimal peak-to-average power ratio exists that minimizes the average BER in the channel inversion scheme.
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