Time Domain Synchronization Method Based on Software Defined Radio CMMB Demodulator
A time-domain synchronization, software-defined technology, applied in the field of signal processing, can solve the problems of inability to directly transplant the CMMB receiving module and increase the cost, so as to reduce the workload, meet the needs of users, and save system resources.
Active Publication Date: 2016-12-28
DELPHI ELECTRONICS SUZHOU
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Problems solved by technology
Greatly increased the cost of supplying the platform to the world, not suitable for international manufacturers to purchase
[0005] In the design based on software-defined radio, since CMMB is a standard with independent intellectual property rights in China, its standard design is slightly different from other international standards, so that the methods of other standards cannot be directly transplanted into the CMMB receiving module based on software-defined radio
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[0034] Such as figure 1 Shown, a kind of time domain synchronization method based on software defined radio CMMB demodulator, comprises the following steps:
[0035] 1) The digital front end receives the signal, completes the A / D conversion of the signal and the sampling and quantization of the signal.
[0036] 2) The digital front end stores the sampled data into the ping-pong buffer, and counts the sampled data stored in the ping-pong buffer through the counter.
[0037] 3) Carry out synchronization frame position estimation and frequency offset compensation calculation on the data in the ping-pong buffer, specifically including the following steps:
[0038] 31) Extract the data in the ping-pong buffer for auto-correlation calculation, and use the results obtained from the auto-correlation calculation to perform rough synchronization estimation calculation of synchronization frame position, rough estimation calculation of signal-to-noise ratio (SNR) of the current channel, ...
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The invention relates to a time domain synchronizing method based on a software defined radio CMMB demodulator which includes the following steps that 1) a digital front end receives a signal and finishes analog / digital (A / D) conversion and signal sampling quantization of signals; 2) the digital front end caches sampled data into a ping-pong buffer and counting the sampled data stored into the ping-pang buffer through a counter; 3) synchronization frame position estimation and frequency offset compensation operation are conducted on the data in the ping-pong buffer; 4) the accurate synchronization frame position is calculated according to the data in the ping-pang buffer and the data obtained through the frequency offset compensation operation, and the signal to noise ratio and the FFT length are output for follow-up data processing. Compared with the prior art, the method has the advantages of being favorable for multi-standard expansion and good in applicability and the like.
Description
technical field [0001] The invention relates to a signal processing method in the technical field of radio communication, in particular to a time domain synchronization method based on a software-defined radio CMMB demodulator. Background technique [0002] CMMB (China Mobile Multimedia Broadcasting) is a mobile multimedia broadcasting standard with independent intellectual property rights in my country. At present, TV programs based on CMMB standards have covered more than 800 large and medium-sized cities in my country. CMMB digital TV receivers have also been widely welcomed. [0003] Due to the extensive coverage of CMMB digital TV in China, it is being gradually integrated into the products of the world's car multimedia suppliers and deployed on the world's major brand vehicles. However, since these vehicles are not only sold to the Chinese market, but also cover other markets in the world, car digital TV suppliers urgently need a solution that uses the same hardware ...
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IPC IPC(8): H04L27/26
Inventor 白杨付晶玮
Owner DELPHI ELECTRONICS SUZHOU