SC-FDM system time frequency synchronizer and synchronization method

Abstract

The invention discloses an SC-FDM (single-carrier Frequency-division multiple) system time frequency synchronizer and a synchronization method, mainly solving the problems of a low energy utilization rate, a small frequency offset estimation scope and low estimation precision in the prior art. The synchronizer comprises a delay correlation selection module, a fine frequency compensation module, a coarse frequency compensation module and a time refinement processing module. The synchronization method comprises the following steps: (1) employing Chu sequence with a communication system to construct SC-FDM signal frame; (2) processing the signal to obtain a time coarse synchronization position; (3) carrying out phase extraction and fractional frequency offset compensation treatments on a signal coarse synchronization point; (4) obtaining integer frequency offset of the signal and carrying out integer frequency offset compensation treatment on the received signal; (5) utilizing local training sequence to process the signal and obtain a precise beginning time of the signal. The synchronization method provided in the invention has the advantages of a high energy utilization rate, a large frequency offset estimation scope and high estimation precision, and is suitable for the uplink of a high speed mobile communication system in an LTE (Long Term Evolution) standard.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a time-frequency synchronization device and a time-frequency synchronization method of a single-carrier frequency-division multiplexing (single-carrier Frequency-division multiplxing, SC-FDM) system in ultra-high-speed mobile wireless communication, which can be used for In the time-frequency synchronization module of the ultra-high-speed mobile wireless communication system, the time-frequency synchronization of signals received by ultra-high-speed mobile users is realized. Background technique [0002] In an ultra-high-speed communication system, the ultra-high-speed and high-dynamic movement of the mobile station causes rapid changes in wireless channel characteristics and a large dynamic Doppler shift. In the international long-term evolution (Long Term Evolution, LTE) standard, the uplink of ultra-high-speed mobile communication adopts single-carrier frequency-di...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this method is that in ultra-high-speed mobile communication systems, mobile stations are generally powered by batteries, and the problem of excessive peak-to-average ratio of OFDM transmission technology limits the energy utilization efficiency of the system. Therefore, this method is not applicable. SC-FDMA transmission technology used in the uplink of ultra-high-speed mobile communication systems

[0006] The disadvantage of this method is: the dynamic Doppler frequency offset obtained by correlating the received signal with its reconstructed signal, the frequency offset estimation accuracy is not high enough, and the frequency offset compensation accuracy of ultra-high-speed mobile users cannot be guaranteed, and the method The range of the estimated frequency offset is limited. When the user's moving speed becomes larger, this method cannot estimate the user's signal frequency offset.

Images