Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof

Abstract

The invention provides a signal processing method of a base band receiver of a base station in a digital wireless trunking communication system based on a TDMA (Time Division Multiple Address) technique, comprising the following steps of: filtering; converting single sampling signal flows; demodulating each haploid sampling signal flow; sequentially storing each demodulating code sequence; and then recovering a frame structure of one demodulating code sequence selected from the demodulating code sequences according to synchronously judged outputs. The invention provides a realization method for processing base band signals by accomplishing the final selection of the demodulating code sequences and the recovery of the frame structures according to judgment and presets a frame synchronization time window for the characteristics of a TDMA burst structure to greatly reduce the virtual synchronization probability of frame synchronization. Because the frame synchronization is respectively carried out on the demodulating code sequences, the invention avoids data loss caused by wrong bit synchronization, reduces the synchronization loss probability of the frame synchronization, and improves the sensitivity of the base band receiver.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication, in particular to a baseband receiver of a base station in a digital wireless trunking communication system and an implementation method thereof. Background technique [0002] The purpose of the baseband receiver for digital communication is to complete the processing of the received baseband signal and obtain the demodulated data signal therefrom. Regardless of the scheme adopted by the RF front-end, generally speaking, the signal processing of the baseband part includes four basic steps: shaping filtering, bit synchronization, demodulation, and frame synchronization. [0003] A typical digital wireless trunking system is the TETRA digital wireless trunking system, which adopts the modulation method of pi / 4DQPSK and the multiple access method of TDMA / FDMA. Under the existing technology, the baseband signal processing method of the TETRA base station is as follows: figure ...

AI Technical Summary

Problems solved by technology

Under the condition of low signal-to-noise ratio and deep fading, the performance degradation of the square method will lead to an increase in the probability of timing errors, which directly leads to a greatly increased probability of false synchronization and synchronization loss

The main reason for the decline in the performance of the square method is that the square method needs a long time to accumulate to achieve better performance, but the deep fading environment makes the long-term accumulation unable to achieve the expected effect, and may even cause errors

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