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Adaptive Bit-loading Technique for BICM-OFDM Systems  

Park, Dong-Chan (부산대학교 전자공학과 통신시스템연구실)
Kim, Suk-Chan (부산대학교 전자공학과 통신시스템연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.7C, 2005 , pp. 624-632 More about this Journal
Abstract
We consider an adaptive bit-loading technique for bit interleaved coded modulation-orthogonal frequency division multiplexing(BICM-OFDM) systems. By adjusting transmission parameter of each subcarrier adaptively depending on the subchannel state, the performance of OFDM system can be improved dramatically. In this paper, the number of bits for each subcarrier is allocated to minimize bit error rate keeping the constant throughput for the adaptive transmission technique of BICM-OFDM system which can be applied to real time transmission. Also, We use the discrete Lagrange multiplier method to get the optimum solution under the integer bit allocation constraint. Simulation results show that computational amount of the proposed bit allocation technique is not high and BICM-OfDM system using the proposed technique can get the SNR gain by 2$\~$3 dB over nonadaptive one.
Keywords
Adaptive bit-loading; BICM-OFDM; discrete resource allocation;
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