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adaptive bit and power loading algorithm with low complexity in MIMO-OFDM systems

Journal of Systems Engineering and Electronics 2008年第3期19卷 461-466页

作者： Huo Yongqing Peng Qicong Shao Huaizong School of Communication and Information Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P.R. China

Two adaptive power and bit loading algorithms to maximize the throughput of MIMO-OFDM systems in frequency selective fading environment are proposed. The two algorithms allocate bit based on maximizing the overall throughput. One algorithm allocates power based on guaranteeing that the bit error rate （BER） of each sub-carrier and the total allocated power remain below a target BER threshold and a power threshold, respectively; another one allocates power based on guaranteeing that the mean BER of sub-carriers and the total allocated power remain below a target BER threshold and a power threshold, respectively. The simulation results show that the proposed algorithms can achieve faster throughput with lower computational complexity, which indicates that the proposed algorithms are effective when compared to some existing algorithms.

关键词： MIMO-OFDM adaptive loading throughput BER.

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adaptive Power and Bit Allocation in Multicarrier Systems

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Journal of Electronic Science and Technology of China 2007年第1期5卷 13-17页

作者：霍永青彭启琮邵怀宗 School of Communication and Information Engineering University of Electronic Science and Technology of China

We present two adaptive power and bit allocation algorithms for multicarrier systems in a frequency selective fading environment. One algorithm allocstes bit based on maximizing the channel capacity, another allocates bit based on minimizing the bit-error-rate （BER）. Two algorithms allocate power based on minimizing the BER. Results show that the proposed algorithms are more effective than Fischer＇s algorithm at low average signal-to-noise ration （SNR）. This indicates that our algorithms can achieve high spectral efficiency and high communication reliability during bad channel state. Results also denote the bit and power allocation of each algorithm and effects of the number of subcarriers on the BER performance.

关键词： adaptive loading multicarrier modulation Rayleigh fading frequency selective

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