Title :
Channel adaptive power allocation and pilot optimization for OFDM systems
Author :
Karami, Mansoureh ; Beaulieu, Norman C.
Author_Institution :
Dept. Electr. & Comp. Eng., Univ. of Alberta, Edmonton, AB, Canada
Abstract :
An adaptive resource allocation scheme is designed for OFDM that maximizes the average transmission rate by adapting the power of the data symbols while optimizing the pilot symbol spacing and power. Assuming imperfect channel state information (CSI) at the transmitter, the exact solution obtained for optimum power loading across data subcarriers can not be expressed in terms of elementary functions. A useful approximation, that has the simple form of a water-filling function, is derived for determining the optimum power loading function that is based on imperfect CSI. The merits of the proposed adaptive resource allocation schemes are corroborated by numerical results.
Keywords :
OFDM modulation; channel allocation; radio transmitters; resource allocation; telecommunication channels; OFDM systems; adaptive resource allocation scheme; average transmission rate; channel adaptive power allocation; data symbols; imperfect CSI; imperfect channel state information; optimum power loading function; pilot optimization; pilot symbol spacing; transmitter; waterfilling function; Imperfect channel state information; OFDM; PSAM; mutual information; pilot symbols; power allocation;
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2012.6503894
