New adaptive bit allocation algorithms for multiuser OFDM/CDMA systems |
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Authors: | Hua Zhang Guoan Bi Liren Zhang |
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Affiliation: | (1) Block S1, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore;(2) School of Electrical and Information Engineering, University of South Australia, Mawson Lakes Campus, West Campus, SA 5095, Australia |
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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. |
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Keywords: | Adaptive bit allocation OFDM/CDMA |
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