Method and device for determining frequency shift and Doppler spread in high-speed mobile scenario

Abstract

The disclosure relates to a method and device for determining frequency shift and Doppler spread in a high-speed mobile scenario; the method comprises: acquiring effective paths according to channel impulse response, acquiring effective path related value of each effective path, and acquiring frequency shift estimation of each effective path according to the phase of the corresponding effective path related value; calculating combined weight according the powers of the effective paths, weighting and combining the frequency shift estimations of the effective paths through the combined weight so as to obtain weighted average frequency shift estimation; acquiring root-mean-square frequency shift spread as Doppler spread estimation according to the frequency shift estimations of the effective paths, the weighted average frequency shift estimation and the combined weight. The problem can be solved that a conventional method is unavailable in the high-speed mobile scenario when multi-path line-of-sight components are great and bear different frequency shifts; the frequency shifts can be estimated effectively; the problem can also be solved that a uniform scattering model is inconsistent and Bessel function is unsuitable in conventional Doppler estimation methods; Doppler spread in the high-speed mobile scenario can be acquired.

Description

technical field [0001] The present disclosure relates to the field of communication technologies, and in particular to a method and device for determining frequency offset and Doppler spread in a high-speed mobile scene. Background technique [0002] On a regular channel, each multipath is composed of uniformly scattered indistinguishable paths, and the frequency offset carried by each multipath is mainly the frequency offset between the frequency of the signal sent by the network side and the frequency of the local crystal oscillator of the terminal. At present, private networks are used for coverage along the high-speed rail, and the network deployment method usually adopts a combination of BBU (English: Base Band Unit, Chinese: Base Band Unit) and RRU (English: Radio Remote Unit, Chinese: Wireless Remote Unit). Therefore, a terminal moving at high speed between multiple RRUs of the same base station will receive wireless signals from multiple RRUs at the same time, and th...

AI Technical Summary

Problems solved by technology

Because the direct line-of-sight component of each multipath in the high-speed rail channel is large and the scattering path component is small, the frequency offset carried by each multipath and the speed of the terminal are related to factors such as the angle between the terminal and each RRU. The premise of the calculation method of frequency offset estimation and Doppler spread used by existing technologies is that each multipath in the channel carries the same frequency offset and the channel satisfies Rayleigh fading, so it is no longer suitable for scenarios involving high-speed movement

Images