Definite-time detection method for frame synchronization of TETRA base station baseband receiver

Abstract

The invention provides a definite-time detection method for the frame synchronization of a TETRA base station baseband receiver, which can overcome the degradation of the receiving performance of the base station as a result of false synchronization. In the invention, the frame synchronization detection is carried out in a frame synchronization time window, and the definite-time detection method comprises the following steps: providing two sub-time slot burst synchronization time windows in a time slot burst, and respectively detecting two normal training sequences orderly in the two sub-timeslot burst synchronization time windows. The invention presets the frame synchronization time window based on the characteristic of the TDMA bust structure, thereby greatly reducing the false synchronization probability of the frame synchronization. The invention sets the two synchronization time windows corresponding to the normal uplink burst and the control uplink burst in the definite-time flow based on the characteristic of the TETRA uplink burst, and different synchronization time window signals can enable the frame synchronization detector to accurately detect the corresponding training sequences. Under the condition of realizing the synchronization technology, the sensitivity performance of the baseband receiver is improved.

Description

Technical field [0001] The invention relates to the technical field of digital wireless trunking communication, in particular to a timing detection method designed for frame synchronization processing in the baseband signal processing process of a base station in a TETRA system. Background technique [0002] The purpose of a baseband receiver for digital communication is to complete the processing of the received baseband signal and obtain the demodulated data signal from it. Generally speaking, the signal processing of the baseband part includes four basic steps: shaping filtering, bit synchronization, demodulation, and frame synchronization. [0003] In the TETRA digital wireless trunking system, the main function of base station frame synchronization is to identify three uplink training sequences from the code sequence demodulated by the front end, and determine the data format of the corresponding frame according to this training sequence. [0004] In practical applications, if ...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, if the same code group as the training sequence to be identified appears in the valid data sent; or a code group similar to the training sequence is generated due to various error reasons, which is mistaken for the training sequence by the recognizer, Therefore, false synchronization is achieved, which will reduce the receiving performance of the base station

Images