Regular sign restoring device and method for orthogonal frequency-division multiplexing receiver

A symbol timing recovery and symbol timing technology, which is applied in the direction of orthogonal multiplexing system, synchronization device, multiplexing communication, etc., can solve the symbol timing offset error, the average difference becomes large, and cannot be properly compensated Issues such as symbol timing offset

Inactive Publication Date: 2003-07-30
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the difference in the mean becomes larger, which leads to a larger error in the symbol timing offset
Furthermore, the symb...

Method used

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  • Regular sign restoring device and method for orthogonal frequency-division multiplexing receiver
  • Regular sign restoring device and method for orthogonal frequency-division multiplexing receiver
  • Regular sign restoring device and method for orthogonal frequency-division multiplexing receiver

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Embodiment Construction

[0051] From now on, the present invention will be described in more detail by referring to the accompanying drawings.

[0052] Figure 4 is a block diagram showing the symbol timing recovery device of the OFDM receiver according to the preferred embodiment of the present invention. Before describing the symbol timing recovery means, the OFDM receiver is briefly described.

[0053] The OFDM receiver includes an analog-to-digital converter (ADC) 100 , a symbol timing recovery device 500 , a fast Fourier transform (FFT) unit 400 , an equalizer 600 , and a forward error corrector (FEC) 700 .

[0054] The ADC 100 converts the received OFDM signal into a digital signal through sampling, quantization and encoding. The symbol timing recovery device 500 adjusts the sampling offset generated in the sampling of the ADC 100 and the window timing offset generated in the Fourier transform for restoring the OFDM signal; the FFT unit 400 adjusts the window timing according to the symbol tim...

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Abstract

A symbol timing recovering apparatus of an orthogonal frequency division multiplexing (OFDM) receiver includes a unit for detecting a symbol timing offset from an OFDM signal; a unit for multiplying a first symbol timing offset by a first weighting factor and a second symbol timing offset by a second weighting factor, and adding and outputting the products; a unit for detecting an inter-symbol interference and a sampling offset value of the OFDM signal due to the channel, based on the outputs from the factor computing unit; a unit for adjusting a window timing of the symbol of the OFDM signal based on the inter-symbol interference; and an interpolator for correcting the sampling timing of the OFDM signal based on the sampling offset value.

Description

technical field [0001] The present invention generally relates to a symbol timing recovery device of an Orthogonal Frequency Division Multiplexing (OFDM) receiver, and more particularly to a symbol timing recovery device of an OFDM receiver, which can compensate the offset occurring in the process of recovering the received OFDM signal. Background technique [0002] Broadcasting systems for digital television (DTV) mostly include an image coding unit and a modulation unit. The image encoding unit compresses digital data of about 1 Gbps from an image source into data of about 15-18 Mbps. The modulation unit sends digital data of tens of Mbps to the receiver via a limited bandwidth channel with a bandwidth of about 6-8MHz. [0003] Broadcast systems for DTV generally employ terrestrial broadcasts using very high frequency (VHF) or ultra high frequency (UHF) channels allocated to existing television broadcasts. Therefore, considering the terrestrial broadcasting environment, ...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L5/06H04L7/00H04L27/26
CPCH04L27/2691H04L27/2662H04L27/2657H04L5/06
Inventor 丁海主
Owner SAMSUNG ELECTRONICS CO LTD
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