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A Fast Coarse Symbol Timing Synchronization Method for CMMB Signals Based on Platform Effect

A timing synchronization and coarse symbol technology, which is applied in image communication, selective content distribution, electrical components, etc., can solve the problem of reduced synchronization accuracy and achieve the effect of improving synchronization speed and ensuring synchronization accuracy

Active Publication Date: 2018-01-02
HEFEI UNIV OF TECH
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  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem in the prior art that the synchronization accuracy is easily reduced when the synchronization speed of coarse symbol timing synchronization is increased, and to provide a fast coarse symbol timing synchronization method for CMMB signals based on the platform effect, which can effectively improve the coarse symbol timing synchronization method. The operation speed of timing synchronization, while ensuring the synchronization accuracy of coarse symbol timing synchronization

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  • A Fast Coarse Symbol Timing Synchronization Method for CMMB Signals Based on Platform Effect
  • A Fast Coarse Symbol Timing Synchronization Method for CMMB Signals Based on Platform Effect
  • A Fast Coarse Symbol Timing Synchronization Method for CMMB Signals Based on Platform Effect

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Embodiment Construction

[0050] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] In an embodiment, the selected input signal is a CMMB time-domain signal whose physical layer bandwidth is 8MHz; the time length T of the CMMB time-domain signal is 25.4095 milliseconds; the sampling frequency f when sampling the CMMB time-domain signal s Take 10MHz.

[0052] figure 1 It is a schematic flow chart of the basic method of the present invention. As can be seen from this figure, the present invention mainly comprises the following steps:

[0053] Step 1, the sampling frequency is f for the CMMB time-domain signal with a time length of T s Sampling, the amount of data obtained is N all CMMB time-domain sampling data r, where N all is the total number of CMMB time domain samples.

[0054] Step 2, carry out D-point Schmidl&Cox synchronization of N-point interval sampling;

[0055] Step 2.1, select the N value and the D va...

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Abstract

The invention provides a CMMB signal rapid bold-symbol timing synchronization method based on the plateau effect. The CMMB signal rapid bold-symbol timing synchronization method based on the plateau effect comprises the steps that firstly, CMMB time-domain signals are sampled; secondly, two-stage bold-symbol timing synchronization is conducted on CMMB time-domain sample data, wherein in the first stage, small-point-number Schmidl&Cox synchronization based on interval sampling is conducted on the CMMB time-domain sample data, the low synchronization requirement is exchanged for the high synchronization speed, and a time slot position is rapidly and effectively positioned within a narrow range comprising a peak value plateau; in the second stage, more-accurate traditional Schmidl&Cox synchronization is conducted within the narrow range, so that the time slot position is found out. According to the CMMB signal rapid bold-symbol timing synchronization method based on the plateau effect, the computing speed of bold-symbol timing synchronization is effectively increased by means of the wide-range interval-sampling synchronization in the first stage, and bold-symbol timing synchronization precision is guaranteed by means of the narrow-range high-precision synchronization in the second stage.

Description

technical field [0001] The invention relates to the field of digital broadcasting, aims at improving the synchronous processing speed of CMMB signals, and proposes a fast coarse symbol timing synchronization method for CMMB signals based on the platform effect. Background technique [0002] China Mobile Multimedia Broadcasting (CMMB) adopts the most advanced channel error correction coding and Orthogonal Frequency Division Multiplexing (OFDM) modulation technology, which improves the ability to resist various interferences and supports mobility. The CMMB signal frame is divided into 40 time slots, and each time slot contains 1 transmitter identification signal, 2 synchronization signals and 53 OFDM symbols, among which OFDM symbols carry video, audio and other information, and their content is very important. [0003] Due to the channel delay and the unknown of the exact timing of the signal sent by the transmitter at the receiver, the first problem to be solved at the recei...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/61H04N21/2383
CPCH04N21/2383H04N21/6131
Inventor 孔慧芳左继国彭虎刘杏王新黄琳琳
Owner HEFEI UNIV OF TECH
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