基于最大比特速率准则的FMT频域均衡算法

钟华; 郑林华; 金国平

doi:10.3724/SP.J.1146.2009.00848

基于最大比特速率准则的FMT频域均衡算法

doi: 10.3724/SP.J.1146.2009.00848

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出版历程
- 收稿日期: 2009-06-05
- 修回日期: 2009-12-01
- 刊出日期: 2010-06-19

Bit-Rate Maximization Frequency-Domain Equalization Algorithm for FMT Systems

摘要

摘要: 针对严格采样滤波多音调制(Filtered Multi-Tone modulation，FMT)系统符号间干扰严重的问题，通过推导严格采样FMT系统的矩阵表示式，提出了一种新的频域均衡算法，该算法以最大化比特速率为目标来确定均衡器的系数。仿真结果表明，在ATTC(Advanced Television Technology Center)E型信道条件下，新算法的可达比特率(Achievable Bit Rate，ABR)性能比最小均方误差准则的线性均衡和判决反馈均衡分别提高了40%和70%，误码率性能在BER为10-4则分别改善了3 dB和5 dB；而在WLAN信道条件下，新算法的ABR性能分别提高了45%和75%，误码率性能在BER为10-4则分别改善了6 dB和10 dB。
- 无线通信; 频域均衡; 滤波多音(FMT)调制; 符号间干扰; 可达比特速率
Abstract: Through deriving the matrix representations of the critical-sampled Filtered Multi-Tone(FMT) modulation system, a new subchannel frequency-domain equalization algorithm is proposed in this paper to eliminate the Inter-Symbol Interference(ISI) in critical-sampled FMT system. The coefficients of the equalizer are calculated based on Maximizing Subchannel Bit-rate(MSB) rule. Simulation results show that the ABR performance of the proposed algorithm is enhanced 40 percent and 70 percent respectively in comparison with that of the previously proposed frequency domain equalization algorithm based on minimum-mean-square-error rule(LIN) and the DFE equalization algorithm, and the proposed algorithm brings about 3 dB and 5 dB improvement over the LIN and the DFE equalization algorithm in ATTC E channel; in the WLAN Channel, the ABR performance of the proposed algorithm is enhanced 45 percent and 75 percent respectively in comparison with that of the LIN and the DFE equalization algorithm, and the proposed algorithm brings about 6 dB and 10 dB improvement over the LIN and the DFE equalization algorithm.

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