Method and device for measuring speed by using pilot frequency

Abstract

Disclosed are a velocity measurement method and apparatus using a pilot frequency, relating to the field of communications, and used to improve the precision in measuring the moving velocity of a terminal, and reduce the complexity of a velocity measurement process. The method comprises: measuring the velocity of a terminal using a pilot frequency, obtaining a correct frequency domain channel response according to known data sent by the pilot frequency, obtaining a frequency domain channel variation parameter according to a difference of frequency domain channel responses between pilot frequencies in a specified time domain range, and determining a current moving velocity of the terminal according to the frequency domain channel variation parameter. In this way, the velocity measurement process is not affected by the fluctuations of signal amplitude, thereby effectively improving the precision of the velocity measurement algorithm. Moreover, the embodiments only use pilot frequencies received in a specified time domain range; the data processing amount is small and the processing time is relatively short, effectively reducing the complexity of the velocity measurement algorithm.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for speed measurement using pilot frequency. Background technique [0002] In the communication system, the fast movement of the terminal will produce a large Doppler shift, especially in the multipath scenario, it will cause the rapid fading of the signal amplitude and the rapid change of the signal phase, which will lead to the deterioration of the system performance. In order to avoid system performance being affected by the rapid movement of the terminal, under the existing technology, the receiving end usually adjusts the channel estimation method and the signal detection related algorithm adaptively according to the current moving speed of the terminal. At this time, a more accurate Speed ​​measurement algorithm to support this adaptive adjustment strategy. [0003] The existing speed measurement algorithms mainly include the following types: [0004] A. Cros...

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Problems solved by technology

[0012] On the other hand, under the existing technology, when using the above two speed measurement algorithms to estimate the mobile speed of the terminal, it is generally to use all the received signals for channel estimation, and then use the frequency domain channel response values ​​obtained on the full bandwidth to make statistics on the full bandwidth. The channel correlation or Le of each subcarrier, so as to measure the mobile speed of the terminal, the data processing volume is large, and the processing time is long, so that the mobile speed of the terminal measured this time can only be used for channel estimation and signal detection next time It has a certain time delay, so it is difficult to achieve high measurement accuracy

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