| Low complexity bit loading algorithm for OFDM system |
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| 作者姓名： | Yang Yu Sha Xuejun & Zhang Zhonghua . National Key Laboratory of Tunable Laser Technology Harbin Inst. of Technology Harbin P. R. China . Communication Research Center Harbin Inst. of Technology Harbin P. R. China |
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| 作者单位： | Yang Yu1，Sha Xuejun2 & Zhang Zhonghua1 1. National Key Laboratory of Tunable Laser Technology，Harbin Inst. of Technology，Harbin 150001，P. R. China 2. Communication Research Center，Harbin Inst. of Technology，Harbin 150001，P. R. China |
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| 摘 要： | 1.INTRODUCTIONOrthogonal frequency division multiplexing is apromising technique for the next generation of wire-less communication systems.OFDMdivides the en-tire transmission bandwidth intoNorthogonal sub-channels.By adding a cyclic prefix(CP)to eachOFDMsymbol,bothintersymbol andintercarrier in-terference can be removed.Besides the i mproved i m-munity to fast fading brought by the multicarrierproperty of OFDMsystems,the subchannels are in-dependent of each other1].When the chann…
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| 收稿时间： | 8 April 2005. |
Low complexity bit loading algorithm for OFDM system |
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| Yang Yu,Sha Xuejun & Zhang Zhonghua . National Key Laboratory of Tunable Laser Technology,Harbin Inst. of Technology,Harbin ,P. R. China . Communication Research Center,Harbin Inst. of Technology,Harbin ,P. R. China.Low complexity bit loading algorithm for OFDM system[J].Journal of Systems Engineering and Electronics,2006,17(1):71-74. |
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| Authors: | Yang Yu Sha Xuejun Zhang Zhonghua |
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| Institution: | 1. National Key Laboratory of Tunable Laser Technology, Harbin Inst. of Technology, Harbin 150001, P. R. China
2. Communication Research Center, Harbin Inst. of Technology, Harbin 150001, P. R. China |
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| Abstract: | A new approach to loading for orthogonal frequency division multiplexing (OFDM) system is proposed, this bit-loading algorithm assigns bits to different subchannels in order to minimize the transmit energy. In the algorithm, first most bit are allocated to each subchannels according to channel condition, Shannon formula and QoS require of the user, then the residual bit are allocated to the subchannels bit by bit. In this way the algorithm is efficient while calculation is less complex. This is the first time to load bits with the scale following Shannon formula and the algorithm is of O (4N) complexity. |
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| Keywords: | OFDM bit loading Shannon formula QoS |
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