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Method and system for controlling time frequency synchronization

A time-frequency synchronization and position synchronization technology, applied in multi-frequency code systems, synchronization devices, transmission systems, etc., can solve the problem of sacrificing system performance and achieve the effect of reducing power consumption and improving stability

Active Publication Date: 2014-07-02
ZTE CORP
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Problems solved by technology

[0007] The problem to be solved by the embodiments of the present invention is to provide a method and system for controlling time-frequency synchronization, so as to solve the problem in the prior art that the performance of the system is sacrificed while reducing power consumption

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  • Method and system for controlling time frequency synchronization
  • Method and system for controlling time frequency synchronization

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Embodiment Construction

[0026] The core idea of ​​the present invention is: use the continuous pilot sequence in the CMMB protocol to obtain the channel state, flexibly configure the correlation calculation length and search range of the synchronous search according to the channel state, and achieve the effect of reducing system power consumption under the premise of ensuring system performance , thereby improving the stability of the system.

[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0028] An embodiment of the present invention provides a method for controlling time-frequency synchronization, such as figure 1 shown, including:

[0029] 101. After the system is powered on, perform continuous search;

[0030] 102. After completing the continuous search, perform a non-continuous search according to the set correlation operation length and time slot search range to obtain the sy...

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Abstract

The invention discloses a method and system for controlling time frequency synchronization, belonging to the field of CMMB (China Mobile Multimedia Broadcasting) digital television. The method comprises the following steps: powering on the system and performing continuous search; after the continuous search, performing discontinuous search according to a set correlation calculation length and a time slot search range to obtain a synchronous position; demodulating data according to the synchronous position to obtain the demodulated data; performing channel estimation according to the demodulated data to obtain a channel state; obtaining the correlation calculation length and time slot search range corresponding to the channel state to be used as the parameters of the next discontinuous search; and performing the discontinuous search, data demodulation and channel estimation repeatedly in turn, wherein the correlation calculation length and time slot search range corresponding to the channel state obtained each time are used as the parameters of the next discontinuous search. Through the invention, the power consumption of the system can be reduced on the premise of ensuring the system performance.

Description

technical field [0001] The invention relates to the field of China Mobile Multimedia Broadcasting (CMMB) digital television, in particular to a method and system for controlling time-frequency synchronization of a low-power CMMB system. Background technique [0002] China Mobile's multimedia broadcasting is mainly oriented to small-screen handheld terminal equipment. Its terminal products mainly include MP4, mobile phones, Global Positioning System (Global Positioning System, GPS), Universal Serial BUS (USB) receiving sticks, independent receiving Provide digital radio and television programs, comprehensive information and emergency broadcast services, and realize seamless coordinated coverage of satellite transmission and terrestrial network. [0003] The CMMB system uses Orthogonal Frequency Division Multiplexing (OFDM) as its physical layer modulation method, but OFDM technology is very sensitive to timing and frequency offsets, and small timing and frequency deviations w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L7/00
Inventor 王瑞珉陈冬
Owner ZTE CORP
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