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Method and device for timing and synchronizing signal of CMMB (China Mobile Multimedia Broadcasting) system

A timing synchronization and signal timing technology, applied in the field of digital information transmission, can solve the problems of slow timing synchronization and complex implementation

Inactive Publication Date: 2012-07-18
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Summary
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Problems solved by technology

The traditional method performs the same timing synchronization processing for each burst data segment. Although the required timing synchronization position can be obtained, the implementation is more complicated and the timing synchronization speed is relatively slow.

Method used

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  • Method and device for timing and synchronizing signal of CMMB (China Mobile Multimedia Broadcasting) system
  • Method and device for timing and synchronizing signal of CMMB (China Mobile Multimedia Broadcasting) system
  • Method and device for timing and synchronizing signal of CMMB (China Mobile Multimedia Broadcasting) system

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Embodiment Construction

[0019] In order to restore the received signal at the receiving end, a lot of redundant data is inserted into the CMMB signal frame, a pseudo-random sequence is inserted before each signal frame in the time domain, and a pilot is inserted into the signal frame in the frequency domain. These redundant data can assist the receiving end to perform signal processing such as signal timing synchronization and channel estimation. In the CMMB system, in order to obtain an accurate timing synchronization position result in each burst data segment, it is necessary to use the pseudo-random sequence in the time domain to estimate the starting position of the effective signal. Since the pseudo-random sequence in the time domain is relatively strongly affected by air interference, the error of the estimation result is relatively large. After the rough estimation of the synchronization position of the pseudo-random sequence, it is necessary to use the cross-correlation processing of the signa...

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Abstract

The invention discloses a method for timing and synchronizing a signal of a CMMB (China Mobile Multimedia Broadcasting) system, which comprises the following steps of: step 1, after a CMMB receiver is power on, firstly carrying out coarse timing synchronization so as to carry out signal acquisition, and obtaining an initial position of a current bursty data segment; step 2, before each bursty data segment after coarse timing synchronization, carrying out fine timing synchronization estimation under the control of an enable signal, and calculating a timing synchronization error of the current bursty data segment; and step 3, adding a fine timing synchronization estimation result obtained by each bursty data segment and cumulative results of the timing synchronization errors together, and obtaining an absolute timing position of the bursty data segment. The invention also discloses a device for timing and synchronizing the signal of the CMMB system. The method and the device are simple to control and quick in synchronization processing, and cannot cause loss of synchronization precision.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a signal timing synchronization method in a CMMB (China Mobile Multimedia Broadcasting, China Mobile Digital Multimedia Broadcasting) system. The invention also relates to a signal timing synchronization device for CMMB system. Background technique [0002] CMMB is the China Mobile Multimedia Broadcasting industry standard promulgated by the State Administration of Radio, Film and Television of China in October 2006. The standard came into effect on November 1, 2006. It is a wireless broadcasting system based on multi-carrier OFDM (orthogonal frequency division multiplexing) technology, which uses advanced channel error correction coding and multi-carrier OFDM modulation technology to improve anti-interference ability and support for mobility; slot transmission mode to reduce the power consumption of the terminal. According to the assumption of CMMB network cover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W56/00
Inventor 刘鹏
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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