Joint channel estimation and signal detection method and device based on OTFS modulation

Abstract

The invention provides a joint channel estimation and signal detection method and device based on OTFS modulation, and the method comprises the steps: receiving an OTFS modulation signal, scanning a corresponding pilot frequency receiving position according to a preset pilot frequency structure, and obtaining a receiving pilot frequency signal; according to the received pilot signals, estimating the channel parameters of each path and performing reconstruction to obtain an initial estimation channel; determining a transmitting signal according to the received signal and the estimated channel of each group of antennas, and determining an optimized channel according to the detected transmitting signal and the received signal; wherein the pilot frequency intervals of different antennas in the preset pilot frequency structure are determined according to the maximum time delay, a protection interval is arranged between the pilot frequency and the transmission signal, and the protection interval is determined according to the maximum Doppler frequency shift. According to the method, the received pilot signal difference of different transmitting antennas on the same antenna can be clearly distinguished, and the estimation precision is improved. The pilot frequency structure only occupies a small amount of channel resources, the resource utilization rate can be improved, and the problem of overlarge pilot frequency overhead is avoided.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a joint channel estimation method and device based on OTFS modulation. Background technique [0002] As one of the typical application scenarios of 5G, high-speed scenarios such as V2V, communication between base stations and UAVs, and communication between base stations and high-speed mobile trains will cause the channel to change quickly, resulting in large Doppler extension. OFDM technology, which is widely used in 4G systems, can effectively resist inter-symbol interference caused by delay spread, and achieve high spectral efficiency in the case of time-invariant channels. But the Doppler spread under the time-varying channel will lead to inter-subcarrier interference in OFDM, thus degrading the performance of OFDM. [0003] Orthogonal Time-Frequency-Space (OTFS) modulation technology is a new communication technology proposed in recent years to replace OFDM to combat ...

AI Technical Summary

Problems solved by technology

In order to give full play to the advantages of massive MIMO-OTFS, it is necessary to obtain as accurate channel state information as possible. However, due to the large number of antennas on the base station side, the pilot overhead of the orthogonal pilot used by the traditional channel estimation method is too large.

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