Analysis of Per-Channel Equalized Filtered Multitone Modulations Over Time-Varying Fading Channels

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2006-12-11 DOI:10.1109/PIMRC.2006.254300

Tiejun Wang, J. Proakis, J. Zeidler

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引用次数: 5

Abstract

We consider the performance of an FMT system with perchannel equalization over frequency-selective time-varying fading channels. Due to the distortion caused by frequency and time selectivity of the fading channel, both ICI and ISI exist in an FMT system and cause performance degradation. By using a per-channel equalizer at the FMT receiver with sufficiently large number of equalizer taps, the ISI can be mitigated significantly, but the ICI still exists. In this paper, the effects of the interference caused by the time-frequency dispersive channel is quantified by analyzing the average system carrier to interference (CIY) ratio of the FMT system under different fading conditions. A closed-form expression for the C/I ratio and its upper bound are provided for the FMT system, which lead to a better understanding of the trade-off between spectral efficiency and system performance degradation. Moreover, comparisons between FMT and OFDM systems under the same channel conditions and spectral efficiency are also provided. Numerical and simulation results of the system C/I ratio further confirm and support the obtained analytical results

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时变衰落信道上的每通道均衡滤波多音调制分析

研究了在频率选择性时变衰落信道上采用全信道均衡的FMT系统的性能。由于变形引起的频率和时间选择性衰落信道,ISI和ICI FMT系统存在,导致性能下降。通过在FMT接收器上使用具有足够大数量均衡器抽头的单通道均衡器，可以显著减轻ISI，但ICI仍然存在。本文通过分析FMT系统在不同衰落条件下的平均载波干扰比(city)，量化了时频色散信道对系统干扰的影响。为FMT系统提供了C/I比率及其上界的封闭表达式，从而更好地理解频谱效率与系统性能退化之间的权衡。此外，还比较了FMT和OFDM系统在相同信道条件和频谱效率下的性能。系统C/I比的数值和仿真结果进一步证实和支持了所得的分析结果

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2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications

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