Research on adaptive subcarrier-bit-power allocation for OFDMA

Authors:
Guogang Huang;Jiaming He;Qingbo Zhang
Affiliations:
Communication Technology Institute, Ningbo University, Ningbo, China;Communication Technology Institute, Ningbo University, Ningbo, China;Communication Technology Institute, Ningbo University, Ningbo, China and Zhejiang Business Technology Institute, Ningbo, China
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

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Communication over fading channels with delay constraints

IEEE Transactions on Information Theory

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Abstract

Resources allocation of OFDM system is a key factor that affects system performance. Parteek Bansal proposed a bit-power allocation algorithm under different Bit Error Rate (BER). But the process of its bit allocation will cause high complexity and bad real-time to build a power-increment table. In this paper, a low-complexity multi-user subcarrier-bit-power allocation algorithm for wireless OFDMA system is proposed. In this new algorithm, the subcarriers are allocated to the user who has the best channel quality. As a result, channel capacity, based on multi-user frequency division, is improved through subcarrier allocation. At the same time, power allocation is advanced based on channel-loss-compensation. The result of simulation shows that the new algorithm's complexity is lower than Parteek Bansal's, and the BER is improved in the same SNR.