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Capacity Per Unit Energy of Fading Channels With a Peak Constraint

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2 Author(s)
Sethuraman, V. ; Dept. of Electr. & Comput. Eng., Univ. of Illinois, Urbana, IL, USA ; Hajek, B.

A discrete-time single-user scalar channel with temporally correlated Rayleigh fading is analyzed. There is no side information at the transmitter or the receiver. A simple expression is given for the capacity per unit energy, in the presence of a peak constraint. The simple formula of VerdÚ for capacity per unit cost is adapted to a channel with memory, and is used in the proof. In addition to bounding the capacity of a channel with correlated fading, the result gives some insight into the relationship between the correlation in the fading process and the channel capacity. The results are extended to a channel with side information, showing that the capacity per unit energy is one nat per joule, independently of the peak power constraint. A continuous-time version of the model is also considered. The capacity per unit energy subject to a peak constraint (but no bandwidth constraint) is given by an expression similar to that for discrete time, and is evaluated for Gauss–Markov and Clarke fading channels.

Published in:

Information Theory, IEEE Transactions on  (Volume:51 ,  Issue: 9 )

Date of Publication:

Sept. 2005

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