Joint Time-Frequency Estimation Method in Broadband Wireless Communication System

Abstract

The invention discloses a time and frequency joint estimation method in a broadband wireless communication system. The method comprises the steps of (1), obtaining pilot data; (2), obtaining load data; (3), adding the load data, as a sending packet, to the tail part of the pilot data in the steps (1), and sending the load data to the receiving end of the communication system for storage as receiving cache data; (4), obtaining delay relation data; (5), correcting fraction frequency offset; (6), obtaining first local relation data and second local relation data; (7), obtaining a time and frequency joint estimation value; (8), correcting integer frequency offset; and (9), obtaining a time sync location, thereby finishing time and frequency joint sync. According to the method, a frequency offset estimation range is improved to the integer frequency offset, and moreover, the calculation complexity of the integer frequency offset is reduced. The rapid and accurate time and frequency sync problem of the wireless communication system in a high-speed operation scene can be solved.

Description

technical field [0001] The invention belongs to the field of communication technology, and further relates to orthogonal frequency division multiplexing and single-carrier frequency domain equalization broadband communication technology, and is a time-frequency joint estimation method in a broadband wireless communication system. Background technique [0002] Due to the multipath effect between the transmitting and receiving ends of the wireless communication system, the received signal has delay spread and Doppler frequency offset due to the influence of multipath, so that the received signal cannot be directly demodulated, and time synchronization and frequency synchronization are required to eliminate multipath effects. In the prior art, most of the phase-locked loops are used to eliminate the frequency offset, and the locking speed of the phase-locked loop is slow, which consumes a lot of resources; or the correlation of the received signal is used to perform timing sync...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the time-frequency synchronization algorithm is too complex, the frequency synchronization range is not large enough, and the time synchronization is inaccurate under the existing technical level, the present invention provides a time-frequency joint estimation method in a broadband wireless communication system. Offset estimation range to integer multiple frequency offset, while reducing the complexity of integer multiple frequency offset calculation

It can solve the problem of fast and accurate time-frequency synchronization of wireless communication systems in high-speed motion scenarios

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