Channel detection method, device and medium

Abstract

The invention discloses a channel detection method and device and a medium, which are applied to a transmitting end, and comprise the following steps: placing an impulse pilot signal in a time delay-Doppler domain at the transmitting end, modulating the impulse pilot signal to obtain an OTFS signal, transmitting the OTFS signal to a channel needing to be detected after the OTFS signal is obtained so that a receiving end can obtain the OTFS signal, and sending the OTFS signal to the transmitting end. And the OTFS signal is processed to determine the time delay and Doppler characteristics of the channel. Therefore, according to the technical scheme provided by the invention, the impulse pilot signal is directly placed in the time delay-Doppler domain, the signal is modulated by using an OTFS modulation method, the time delay and Doppler characteristics of the channel can be directly obtained, other signal processing is not needed in the process, and the time delay and Doppler characteristics of the channel can be directly obtained. Errors caused by the fact that Doppler domain information of a channel can be obtained only by further processing detected time domain and frequency domain characteristics when pseudo-random sequence detection or multicarrier code division multiple access spread spectrum sequence detection is adopted are avoided, and the detection precision of the channel is improved.

Description

technical field [0001] The present application relates to the communication field, in particular to a channel detection method, device and medium. Background technique [0002] Channel sounding is an important means for the communication system to obtain and disseminate environmental information. Traditional channel detection requires a special detection transmitter and receiver, transmits a known detection sequence on the communication frequency band to be detected, extracts channel characteristics such as channel impulse response, Doppler power spectrum, and the receiving end obtains the return signal for modeling analyze. The transmission signal of the traditional channel detection uses a pseudo-random sequence or a multi-carrier code division multiple access spread spectrum sequence. Using these two transmission signals needs to be detected in the time domain or frequency domain. Transform to obtain the frequency domain signals T(ω) and R(ω), and compare the two to obt...

AI Technical Summary

Problems solved by technology

[0010] Therefore, using the traditional channel detection method, in order to obtain the Doppler domain information of the channel, it is necessary to perform a fast inverse Fourier transform on the channel frequency response to obtain the channel impulse response, and then quickly perform a fast inverse FFT on the autocorrelation function of the channel impulse response. Fourier transform (FFT), and the above signal processing will bring errors and reduce the accuracy of channel detection

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