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Method and apparatus for digital signal reception

A technology for digital signals and receiving devices, applied in digital transmission systems, baseband systems, electrical components, etc., can solve complex problems and achieve the effect of simple and accurate technology implementation

Inactive Publication Date: 2010-01-27
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the main disadvantage of this method is that it is more complicated because of the need to eliminate CPE twice

Method used

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  • Method and apparatus for digital signal reception
  • Method and apparatus for digital signal reception
  • Method and apparatus for digital signal reception

Examples

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Embodiment Construction

[0048] The invention provides an OFDM digital signal receiving device adopting an improved common phase error CPE elimination method. like image 3 As shown, an embodiment of the present invention provides a digital signal receiving device 200, more specifically, an OFDM digital signal receiver. Similar to the traditional OFDM digital signal receiver shown in Figure 1, the main structure of the OFDM digital signal receiver of the present invention includes a demodulation module 210, an FFT module 220, a synchronization and timing module 230, a CPE elimination module 240 , a channel estimation (CE) module 250, and a channel decoding module 260, characterized in that a feedback loop is provided between the CE module 250 and the CPE cancellation module 240.

[0049] like Figure 4 As shown, the CPE elimination module 240 of the OFDM digital signal receiver 200 includes a CSI pilot generation unit 241, a pilot extraction unit 242, a cross-correlation unit 243, a phase estimation ...

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Abstract

The present invention relates to a digital signal reception method and apparatus. Said digital signal receiver comprises a Common Phase Error (CPE) removal unit (240) for eliminating CPE contained in the received signal by using CSI corrected pilot sub-carriers; a channel estimation (CE) unit (250) for estimating channel state information (CSI) of the received signal after removing the CPE and feed the CSI to the CPE removal unit (240), and a means (241) for generating the CSI corrected pilot sub-carriers by multiplying the CSI with 1 or -1 according to positive or negative sign of the local pilot sub-carriers only in response to continual pilots of the received signal. Said method comprises estimating the CSI of the received digital signal after removing CPE; and eliminating the CPE of the received signal by using the CSI corrected pilot sub-carriers, whereby a low complexity and high accuracy are achieved.

Description

field of invention [0001] The invention relates to the digital signal receiving technology in the digital video broadcasting system, in particular to an orthogonal frequency division multiplexing digital signal receiving method and device for accurately eliminating the common phase error of the received signal. technical background [0002] In the field of television broadcasting, digital television (DTV) is a new generation in recent years, and it is an all-digital system from filming to transmission and then to reception. DVB-T is one of the four DTV broadcasting standards in the world, and DVB-H is a handheld application standard based on the DVB-T standard. Both DVB-T and DVB-H are based on Orthogonal Frequency Division (OFDM) technology, which has gained a lot of attention and is used in about 100 countries. The latest research on related technologies is very important for the huge market value of DVB-T / H. [0003] In practical communication systems, modulators and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38
CPCH04L25/0224H04L27/2657H04L27/2695H04L27/2675
Inventor 刘鹏
Owner THOMSON LICENSING SA
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