Apparatus and method for reducing code-element timing in OFDM receiver

A receiver and symbol technology, which is applied in the field of restoring symbol timing, can solve problems such as inability to stably achieve distortion compensation

Inactive Publication Date: 2003-08-27
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

As shown in the figure, in the case where the symbol timing offset value m changes irregularly and drastically, the integral multiple symbol timing offset value Im has different values ​​for each symbol of the OFDM signal, so it cannot be stably realized according to the equalization Compensation for distortion occurring in the transmission channel environment of the device 70

Method used

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  • Apparatus and method for reducing code-element timing in OFDM receiver
  • Apparatus and method for reducing code-element timing in OFDM receiver
  • Apparatus and method for reducing code-element timing in OFDM receiver

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Embodiment Construction

[0032] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0033] image 3 It is a block diagram of the symbol timing restoration device of the OFDM receiver according to the embodiment of the present invention. Before describing the symbol timing recovery device of the embodiment of the present invention, first describe the OFDM receiver.

[0034] exist image 3 , the OFDM receiver has an analog-to-digital converter (ADC) 100 , a symbol timing restoration device 500 , a fast Fourier transform (FFT) unit 400 , an equalizer 600 , and a forward error corrector (FEC) 700 .

[0035] The ADC 100 converts the received OFDM signal into a digital signal by sampling, quantizing, and encoding. The symbol timing restoring device 500 adjusts the window starting point for the fast Fourier transform of the OFDM signal, and adjusts the sampling offset generated in the sampling process of the OFDM signal in the ADC 100 . The FFT un...

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Abstract

An apparatus for recovering symbol timings in an OFDM receiver is disclosed. The apparatus has a unit for estimating symbol timing offset values from a fast Fourier-transformed OFDM signal; a unit for detecting an inter-symbol interference based on the symbol timing offset values; a unit for subtracting adjacent symbol timing offset values and calculating sampling offsets of the OFDM signal; an interpolator for compensating a sampling timing of the OFDM signal in accordance with the sampling offsets calculated; and a unit for adjusting the window timing of the OFDM signal based on the inter-symbol interference detected.

Description

technical field [0001] The present invention relates to a device and a method for restoring symbol timing (symbol timing) in an OFDM (Orthogonal Frequency Division Multiplexing) receiver, in particular to restoring Apparatus and method for symbol timing, said offset being introduced during recovery of a received OFDM signal. Background technique [0002] Generally speaking, a high-definition television (HDTV, High Definition TeleVision) broadcasting system is mainly divided into an image coding part and a modulation part. The image coding part compresses about 1Gbps (Giga Bits Per Second, gigabits per second) digital data obtained from high-definition image sources into 15-18Mbps (Mega Bits Per Second, megabits per second) data. The modulation part transmits the digital data of tens of Mbps to the receiving end through a 6-8MHz (MegaHertz, megahertz) limited bandwidth channel. [0003] Generally, the high-definition broadcasting of the digital system adopts the terrestrial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/015H04L27/26
CPCH04L27/2691H04L27/2662H04N7/015
Inventor 权容植
Owner SAMSUNG ELECTRONICS CO LTD
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