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Method for realizing federated filtering and timing synchronization in digital communication system

A digital communication system, timing synchronization technology, applied in multi-frequency code system, baseband system components, shaping network in transmitter/receiver, etc., can solve problems such as inability to reduce the number of parallel channels and high implementation complexity

Active Publication Date: 2012-02-15
GUANGZHOU HAIGE COMM GRP INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the time-domain parallel structure, this structure cannot reduce the number of parallel output channels. When the transmission symbol rate is high, the implementation complexity is still very large.

Method used

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  • Method for realizing federated filtering and timing synchronization in digital communication system
  • Method for realizing federated filtering and timing synchronization in digital communication system
  • Method for realizing federated filtering and timing synchronization in digital communication system

Examples

Experimental program
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Effect test

Embodiment 1

[0102] Assuming a QPSK modulation system, the symbol rate is f b =1 / T b =150MBaud, the receiver system adopts the analog quadrature down-conversion method, simultaneously samples the I and Q two-way signals in the baseband, the AD sampling rate is twice the symbol rate, and the sampling data is divided into M=2 parallel input digital demodulator, the processing clock frequency of the digital demodulator is f p =160MHz, the receiver matched filter adopts a root-raised cosine filter with a roll-off coefficient of 0.35, and the length of the filter coefficient is L=13. Then the structural diagram of the joint filtering and timing synchronization method is as follows: Figure 4 As shown, the implementation steps are as follows:

[0103] Step 1. Select the length of the FFT

[0104] Since the length of the filter coefficient is L=13, and the number of parallel paths of the input data is M=2, then the length N of the FFT is taken as an integer power of 2 not less than L+M-1=14, ...

Embodiment 2

[0123] Assuming a QPSK modulation system, the symbol rate is f b =1 / T b =405MBaud, the receiver system adopts the method of intermediate frequency direct sampling, and the intermediate frequency carrier frequency is f c =1.2GHz, the AD sampling rate is 4 times the symbol rate, namely f s =1.62Gsps, the sampling data is divided into M=16 parallel input digital demodulators, and the processing clock frequency of the digital demodulators is f p =110MHz, the receiver matched filter adopts a root-raised cosine filter with a roll-off coefficient of 0.35, and the length of the filter coefficient is L=25. Then the structural diagram of the joint filtering and timing synchronization method is as follows: Figure 6 As shown, the implementation steps are as follows:

[0124] Step 1. Select the length of the FFT

[0125] Since the length of the filter coefficient is L=25, and the number of parallel paths of the input data is M=16, then the length N of the FFT is taken as an integer p...

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Abstract

The invention discloses a method for realizing federated filtering and timing synchronization in a digital communication system. The method comprises the following specific steps of: 1, selecting the length for FFT (Fast Fourier Transform) according to a required parallel path number; 2, performing frequency domain filtering; 3, performing timing error compensation in the frequency domain; and 4, calculating a timing error and outputting data subjected to filtering and timing synchronization. According to the method for realizing federated filtering and timing synchronization in the invention, a filter is combined with timing synchronization, the synchronous output path number of the filter is reduced, the computationally expensive required during realization is greatly reduced, the complexity required during realization is lowered, and a system can meet the requirement for high-speed digital communication.

Description

technical field [0001] The invention relates to the technical field of modulation and demodulation in digital communication, in particular to a method for realizing joint filtering and timing synchronization in digital communication. Background technique [0002] With the growth of new satellite services and the development of new high-resolution remote sensors that need to process massive amounts of information, the data transmission rate to be achieved by new earth observation satellites, data relay satellites, space communication network node satellites, and new generation communication satellites It is getting higher and higher, and it is necessary to process and transmit high-speed massive data of hundreds of Mbps or even several Gbps and above in real time. For this reason, aerospace research institutions of various countries have carried out research on space high-speed data transmission technology above 600 Mbps. For example, the GeoEye-1 remote sensing satellite de...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 罗常青刘策伦
Owner GUANGZHOU HAIGE COMM GRP INC
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