An adaptive patterned-subcarrier allocation algorithm for low-complexity multiuser OFDM system

Abstract

In this paper, an adaptive patterned-subcarrier allocation algorithm is proposed for the enhancement of system capacity and low-complexity implementation of subcarrier iden- tification and selection (SIS) process of multiuser OFDM systems. Although an adaptive multiuser subcarrier allocation algorithm can increase the overall system capacity, there is computational inefficiency in the SIS process of conventional receiver because a N -point FFT (N -FFT) is used even for a user who uses only K subcarriers, where K