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PN phase restoration in DMB-T system

A correlation peak and sequence technology, applied in the field of PN phase recovery, can solve the problem that the receiver does not understand the radio channel

Inactive Publication Date: 2009-06-10
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the receiver has little knowledge of the radio channel at the beginning of its operation
Therefore, capturing the PN phase quickly and robustly, especially in harsh wireless environments, is a challenge

Method used

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  • PN phase restoration in DMB-T system
  • PN phase restoration in DMB-T system
  • PN phase restoration in DMB-T system

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Experimental program
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Embodiment Construction

[0019] The present invention will be described in more detail below. Those skilled in the art will recognize that the following detailed description is only illustrative and in no way meant to be limiting. Other embodiments of the present invention will be apparent to those skilled in the art who benefit from the present disclosure. Reference is now made in detail to the embodiments of the present invention shown in the drawings. In all the drawings and the following detailed description, the same reference numerals are used to indicate the same or similar components.

[0020] figure 1 The general structure of the DTV receiver is shown. The signal is received by the RF module (not shown) and sampled in the ADC 105. The sampling signal 107 is applied to the digital front-end circuit 109, and the digital front-end circuit 109 performs synchronization in response to the information 110 from the synchronization block 111. The synchronization block performs calculations to enable, fo...

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Abstract

The invention relates to a PN phase recovery (PPR) method, which is used for acquiring PN sequence phase synchronization in a DMB-T system. The method stably evaluates the time deviation of basic PN sequence positions in continuous signal frames, and precisely judges signal frame indexes through a voting mechanism with medium computation complexity. By utilization of the method, a DMB-T receiver is more stable, can be quickly synchronous with a transmitter on a PN sequence phase, and can also be normally operated in an environment with extremely low signal-to-noise ratio or in an environment with large sampling frequency error.

Description

Background technique [0001] Time Domain Synchronous OFDM (TDS-OFDM) is a basic physical layer scheme of the DMB-T specification of China’s terrestrial broadcasting. Among them, such as figure 2 The multiplex frame structure is used as shown. This frame structure is important for time synchronization in the DMB-T receiver. [0002] The signal frame is the basic unit of the multiplexing frame structure. Such as image 3 As shown, the signal frame includes two time-domain signal parts, namely the frame header and the frame body. The frame header and the frame body have the same baseband symbol data rate (7.56Msym / sec). In the signal frame header, the PN sequence is sent for synchronization and channel estimation. At the same time, the PN frame header also replaces the traditional cyclic prefix (CP) and serves as the guard time interval for the subsequent OFDM frame body. [0003] Length is L PN The PN header consists of three parts: length is N PN The full period of the PN sequence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/04H04B1/707H04L27/26
CPCH04L27/2613H04B1/7075H04L27/2607H04L27/2688H04L27/2656
Inventor 龚明
Owner NXP BV