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Compatible DAB digital broadcasting receiver carrier synchronizing method and system

A carrier synchronization, digital broadcasting technology, applied in multi-frequency code systems and other directions, can solve problems affecting system performance and other issues

Inactive Publication Date: 2007-08-22
NUFRONT MOBILE COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For OFDM systems, this frequency offset between carriers will introduce interference between OFDM subcarriers, greatly affecting system performance

Method used

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  • Compatible DAB digital broadcasting receiver carrier synchronizing method and system
  • Compatible DAB digital broadcasting receiver carrier synchronizing method and system
  • Compatible DAB digital broadcasting receiver carrier synchronizing method and system

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Embodiment Construction

[0038] When the receiver of the digital broadcasting system is turned on, there may be a large carrier frequency deviation from the transmitter. In order to ensure the normal reception of the receiver, carrier synchronization must be carried out.

[0039] The frame structure of the data frame of the MMB / DAB / T-DMB system is shown in FIG. 1 . The data frame is composed of a null symbol, a phase reference symbol, several fast information channel symbols determined by different modes, and several data symbols. The empty symbol is used for frame synchronization of the receiver, the phase reference symbol provides a phase reference for the differential phase modulation and demodulation of subsequent data, and the fast information channel symbol defines the information composition in the following data symbols. Since the information of the phase reference symbol is known at the receiving end, it can be used for carrier synchronization.

[0040] The carrier synchronization system and...

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PUM

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Abstract

A method for synchronizing digital broadcast receiver currier wave of compatible DAB includes using fraction frequency deviation calibration and integer frequency deviation calibration separately to carry out calibration on fraction frequency deviation and integer frequency deviation for finalizing rough frequency deviation calibration then utilizing an order-tracking loop to finish carrier wave synchronization.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a carrier synchronization method for an orthogonal frequency division multiplexing receiver of a digital broadcast MMB, T-DMB and DAB system. Background technique [0002] Due to the influence of local carrier error and so on, there will be a frequency offset between the two carriers at the receiving end and the transmitting end of the digital broadcasting system, thereby affecting the receiving performance of the receiver. OFDM technology is widely used in digital broadcasting systems because it can effectively utilize limited frequency bands. For an OFDM system, this frequency offset between carriers will introduce interference between OFDM subcarriers, greatly affecting system performance. Effective carrier synchronization is of great significance to ensure the performance of digital broadcasting systems. Contents of the invention [0003] The invention is aimed at the car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 鲍东山刘谦雷朱浩
Owner NUFRONT MOBILE COMM TECH
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