Signal processing method of base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technology and base band receiver
A trunking communication and digital wireless technology, applied in baseband system components, communication between multiple stations, transmission system, etc., can solve problems such as performance degradation of the square method, long-term accumulation failure, false synchronization and synchronization, etc. , to achieve the effect of reducing the probability of false synchronization, overcoming instability, and reducing the amount of calculation
Active Publication Date: 2013-11-06
EASTERN COMM
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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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[0052] 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, power detection device 208, square method bit synchronization device 209, frame synchronization and bit synchronization joint decision device 210 and multiplexer 211.
[0053] 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 sa...
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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) technology, which comprises the steps of: filtering, converting haploid sampling signal flow, modulating each haploid sampling signal flow and storing all demodulation code sequences according to a sequence, wherein in the signal processing method, one path is selected from all the paths of the stored demodulation code sequences and a frame structure is restored according to the output of the joint detection of frame synchronization and bit synchronization. By utilizing the characteristic of relatively easy frame synchronization of a TDMA system and specific to the defect of the bit synchronization of a square method, the invention provides an implementation method for base band signal processing, which carries out the joint detection of the frame synchronization and the bit synchronization and completes the final selection and the restoration of the frame structure of the demodulation code sequence according to the detected output. Compared with the prior art, the invention improves the precision of the synchronization and particularly overcomes the instability of the bit synchronization in the presence of low signal to noise ratio and deep fading.
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 ...
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IPC IPC(8): H04L25/02H04B7/26H04B1/16
Inventor 全大英廖科峰杨荣玉张宗军
Owner EASTERN COMM