New adaptive bit allocation algorithms for multiuser OFDM/CDMA systems

Authors:
Hua Zhang;Guoan Bi;Liren Zhang
Affiliations:
Block S1, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore 639798;Block S1, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore 639798;School of Electrical and Information Engineering, University of South Australia, West Campus, Australia SA 5095
Venue:
Wireless Networks
Year:
2009

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Abstract

An adaptive bit allocation algorithm is proposed for multiuser transmission in OFDM/CDMA systems. The proposed scheme takes advantage of frequency diversity to dynamically allocate a suitable number of bits/per symbol on subcarriers of each user based on the transmitting objectives such as the required transmission rate and BER. A suboptimal solution to the problem of the bit allocation on subcarriers for each user is derived by minimizing the interference power from each user. Then an algorithm for adjusting the number of allocated bits is used to further reduce the interference without changing the total transmitted data rate. The performance obtained by minimizing the interference resulting from each user is studied in terms of BER, transmission data rate and the system capacity supporting multiple users. The theoretical analysis and simulation results show that the proposed algorithm substantially outperforms those reported previously.