Discrete Fourier transform extended orthogonal time-frequency spatial modulation method

A discrete Fourier and modulation method technology, applied in the field of discrete Fourier transform extended quadrature time-frequency air conditioning, can solve the problems of high peak-to-average power of the transmitted waveform, reduce the peak-to-average power ratio of the transmitted signal, etc. Rod, improve power amplifier efficiency, reduce the effect of peak-to-average power ratio

Active Publication Date: 2021-10-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] The present invention aims at the problem that the peak-average power of the transmitted waveform of the existing OTFS modulation method is relatively high, and proposes a discrete Fourier transform extended orthogonal time-frequency-space modulation method, which can be compared with the existing waveform OFDM and DFT-s-OFDM It can reduce the peak-to-average power ratio of the transmitted signal while reducing the bit error rate under the high Doppler spread channel

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  • Discrete Fourier transform extended orthogonal time-frequency spatial modulation method
  • Discrete Fourier transform extended orthogonal time-frequency spatial modulation method
  • Discrete Fourier transform extended orthogonal time-frequency spatial modulation method

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Embodiment Construction

[0020] like figure 1 As shown, for the present embodiment, it is directed to a discrete Fourier transform spread orthogonal time frequency and air communication system, including: DFT precoding unit, time delay domain mapping unit, OTFS modulator, OTFS demodulator, Dalgal field equalizer, time delay Doppler field unsettlement unit and IDFT decoding unit, where: DFT precoding unit is connected to the time delay domain map unit and transmit DFT precoding time delay Doppler field The signal, the time delay domain map unit is connected to the OTFS modulator and transmits the mapping, and the OTFS modulator generates the time domain transmit signal, and transmits the signal connected to the radio channel, the receiving end receives the signal. After obtaining the time delay field receives signals through the OTFS demodulator, the delay domain transmit signal is transmitted when the Doppler field equalizer is returned, and the DPLE DPT is decoded by the time delay Doppler Demographic un...

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Abstract

The invention relates to a discrete Fourier transform extended orthogonal time-frequency spatial modulation method, which comprises the steps of performing DFT precoding processing and time delay Doppler domain mapping processing on a digital baseband signal, inputting the digital baseband signal into an OTFS modulator for receiving and transmitting, and simultaneously performing time delay Doppler domain inverse mapping processing and IDFT decoding processing on a received signal to realize modulation and demodulation. Compared with the existing waveform OFDM, the DFT-s-OFDM can reduce the bit error rate under the high Doppler spread channel and can reduce the peak-to-average power ratio of the transmitted signal at the same time.

Description

Technical field [0001] The present invention relates to a technique in the field of terahertz communications, specifically a discrete Fourier transform for millimeter wave and terahertz wireless communication extension orthogonal time-frequency air modulation method. Background technique [0002] The existing orthogonal frequency division multiplex (OFDM) and discrete Fourier transform (DFT) expands OFDM (DFT-S-OFDM), which is no robust to the fast time, which is a fast time to change the high Doppler extension. It may cause carrier interference (ICI) and severely reduce link performance. As the carrier frequency increases, the Doppler extension effect in the THz band is more severe compared to the microwave frequency band. If the waveform parameters in the current commercial mobile system are maintained in the THZ mobile communication system, the data rate and the error rate (BER) performance will deteriorate seriously. Second, when the operating frequency increases, the saturat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B10/90
CPCH04L27/2614H04L27/2628H04B10/90H04L27/2639H04L27/2636H04L27/2634H04L27/26532H04L27/26526H04L27/26524H04L1/0612H04L1/0042H04L27/01
Inventor 韩充吴永知
Owner SHANGHAI JIAO TONG UNIV
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