A new modulation technique for Doppler compensation in frequency-dispersive channels
A new modulation technique for Doppler compensation in frequency-dispersive channels
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频散信道中多普勒补偿的新调制技术
DOI：
10.1109/pimrc.2017.8292240
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
A. Goldsmith
中科院分区：
文献类型：
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作者：
Thomas R. Dean;Mainak Chowdhury;A. Goldsmith
研究了一种新的时频色散信道调制技术。被称为具有频域循环前缀的频域复用（FDM-FDCP）的波形构造有效地校正了由信道引入的多普勒扩展。这种结构背后的数学基础的描述和有效的算法，提出调制和解调信息符号。结果发现，对于具有高多普勒扩展和低延迟扩展的信道，该构造可以在低SER和最小开销方面维持良好的性能，而OFDM则严格地更差。这表明，在快速时变的时频色散信道中，一般的时频信令方案（作为示例的FDM-FDCP）可以优于OFDM或为具有低移动性的多径信道设计的其他波形构造。
A new modulation technique for the time-frequency dispersive channel is considered. The waveform construction, called Frequency-Domain Multiplexing with a Frequency-Domain Cyclic Prefix (FDM-FDCP) efficiently corrects for the Doppler spread introduced by the channel. The mathematical foundations behind this construction are described and efficient algorithms presented to modulate and demodulate information symbols. It is found that for channels with a high Doppler spread and a low delay spread, the construction can sustain good performance in terms of low SER and minimal overhead, whereas OFDM is strictly worse. This shows that, in rapidly time-varying time-frequency dispersive channels, general time-frequency signaling schemes (FDM-FDCP being an example) may outperform OFDM or other waveform constructions designed for multipath channels with low mobility.