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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

A digital wireless, trunking communication technology, applied in the communication, transmission system, electrical components and other directions between multiple stations, can solve the problems of performance degradation of the flat method, false synchronization and synchronization, timing errors, etc., to reduce the probability of synchronization loss , The effect of reducing the probability of false synchronization and avoiding data loss

Active Publication Date: 2010-11-17
EASTERN COMM
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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

Method used

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  • 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
  • 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
  • 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

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Embodiment Construction

[0047] refer to figure 2 . Taking the baseband receiver applied to a TETRA cluster base station as an example, the baseband receiver provided by the present invention comprises a square root raised cosine filter 201, an oversampling serial-to-parallel conversion device 202, a differential demodulator 203, and a demodulation code sequence memory 204 , data buffer 205 , Hamming distance calculation device 206 , frame synchronization window timer 207 , synchronization decision device 208 and multiplexer 209 .

[0048] The square root raised cosine filter 201 is responsible for performing shaping filtering on the input multiple oversampling signal stream, and then connected to the oversampling serial-to-parallel conversion device 202 . The oversampling serial-to-parallel conversion device converts the serial multiple oversampling signal stream into multiple parallel single sampling signal streams, and then connects multiple differential demodulators 203 . Each differential demo...

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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 ...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04B1/06
Inventor 全大英杨荣玉陈池
Owner EASTERN COMM
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