DocumentCode :
2960531
Title :
Subcarrier allocation and power control for OFDMA
Author :
Kivanc, Didem ; Liu, Hui
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Volume :
1
fYear :
2000
fDate :
Oct. 29 2000-Nov. 1 2000
Firstpage :
147
Abstract :
We study the problem of finding an optimal subcarrier and power allocation strategy for downlink communication to multiple users in an OFDM based wireless system. We formulate the problem of minimizing total power consumption with constraints on BER and transmission rate for users requiring different classes of service, and derive simple algorithms which perform well. We divide the larger problem of joint allocation into two steps. In the first step, the number of subcarriers that each user is determined based on the users´ average SNR. Numerical results demonstrate that the proposed low complexity algorithms offer comparable performance with an existing iterative algorithm.
Keywords :
OFDM modulation; bandwidth allocation; computational complexity; error statistics; frequency division multiple access; multiuser channels; power control; telecommunication control; BER constraints; OFDM based wireless system; OFDMA; amplitude craving greedy subcarrier assignment; average SNR; bandwidth assignment; downlink communication; iterative algorithm; joint allocation; low complexity algorithms; optimal power allocation; optimal sub-carrier; optimal subcarrier; power consumption minimisation; power control; rate craving greedy subcarrier assignment; simulation; subcarrier allocation; transmission rate; Bit error rate; Bit rate; Downlink; Energy consumption; Frequency conversion; Iterative algorithms; Lagrangian functions; OFDM; Power control; Time division multiple access;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
ISSN :
1058-6393
Print_ISBN :
0-7803-6514-3
Type :
conf
DOI :
10.1109/ACSSC.2000.910933
Filename :
910933
Link To Document :
بازگشت