JOURNAL OF COMMUNICATIONS (JCM)
ISSN : 1796-2021
Volume : 2    Issue : 5    Date : August 2007

Evolutionary Approach for Efficient Resource Allocation in Multi-User OFDM Systems
Yenumula B. Reddy and Nandigam Gajendar
Page(s): 42-48
Full Text:
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Abstract
Orthogonal Frequency Division Multiplexing is a promising technology for high data rate
transmission in wideband wireless systems for achieving high downlink capabilities in the future
cellular systems. To minimize the overall transmit power, the genetic algorithm approach was
proposed for adaptive subcarrier and bit allocation based on channel state information. This is
done by assigning one subcarrier for one user and each user a set of subcarriers and by
determining the number of bits and the transmit power level for each subcarrier. The simulation
results show that genetic algorithm approach produces better results compared to conventional
algorithms in optimum power allocation. The results further conclude that genetic search helps fast
convergence and can handle large allocations of subcarriers to users (many subcarriers to one
user) without performance degradation.

Index Terms
adaptive power allocation, Genetic Algorithm, fitness, subcarrier, OFDM, frequency, bit error rate