Joint channel estimation and symbol detection method, device, equipment and medium

Abstract

The invention discloses a joint channel estimation and symbol detection method and device in an orthogonal time-frequency spatial modulation system, electronic equipment and a readable storage medium. The method comprises the steps that a receiving end converts communication data output by a sending end to a time delay-Doppler domain, and first receiving data used for channel estimation and second receiving data used for symbol detection are obtained; based on the first received data, determining a time delay-Doppler domain channel tap position by using channel prior information and a maximum posterior probability criterion; positioning a channel path based on the tap position, and performing parameter estimation on a channel coefficient to obtain a channel estimation result; and recovering the information bit according to the channel estimation result and the second receiving data, and performing channel estimation again by taking the information bit as the first receiving data of the next iteration until an iteration ending condition is met. When iteration is finished, the information bit recovered at the last time is used as an information bit estimation result of the communication data, and channel estimation and symbol detection can be carried out more accurately.

Description

technical field [0001] The present application relates to the field of communication technology, in particular to a joint channel estimation and symbol detection method, device, electronic equipment and readable storage medium in an orthogonal time-frequency space modulation system. Background technique [0002] Driven by the ever-increasing demands of users, the fifth-generation wireless network is required to be applied in high-speed mobile scenarios up to 500 km / h. In this high-speed mobile scenario, the Doppler frequency shift makes the channel highly time-selective, which greatly limits the transmission quality and transmission rate. In order to improve the adaptability of the transmission waveform to the large dynamic Doppler effect, the concept of OTFS (Orthogonal Time Frequency Space, Orthogonal Time Frequency Space) modulation was born. In the delay-Doppler domain, the channel has sparse characteristics and changes slowly. The main idea of ​​OTFS is to associate th...

AI Technical Summary

Problems solved by technology

However, the fractional Doppler frequency shift will cause intra-symbol Doppler interference (IDI). In order to avoid the interference of information symbols on channel estimation, the protection symbols need to be extended in the Doppler domain, which reduces the efficiency of spectrum utilization.

Moreover, since LS estimation cannot use channel prior information, the final channel estimation accuracy is not high.

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