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Apparatus for receiving a signal of orthogonal frequency division multiplexing

A technology for receiving signals and signals, used in multiplexing communication, code division multiplexing systems, image communication and other directions, it can solve problems such as data interval distortion, and achieve the effect of preventing distortion and improving performance.

Active Publication Date: 2008-11-12
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

As a result, if the signal is sent to the destination on multiple channels, the data interval of the frame body in the signal is inevitably distorted by the PN sequence

Method used

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  • Apparatus for receiving a signal of orthogonal frequency division multiplexing
  • Apparatus for receiving a signal of orthogonal frequency division multiplexing
  • Apparatus for receiving a signal of orthogonal frequency division multiplexing

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Embodiment Construction

[0024] Reference will now be made in detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0025] FIG. 1 is a block diagram illustrating a DMB-T transmitter. A DMB-T transmitter will be described below with reference to FIG. 1 .

[0026] Referring to FIG. 1, a channel encoder 10 outputs a channel-encoded bit stream in order to detect errors in a receiver.

[0027] Modulator 20 receives the encoded bit stream and modulates the received bit stream according to a 4-ary, 16-ary, or 64-ary quadrature amplitude modulation (QAM) scheme or the like.

[0028] An inverse discrete Fourier transform (IDFT) unit 30 modulates a frequency-domain OFDM modulated signal into a time-domain OFDM signal. In general, the DMB-T scheme converts frequency-domain signals associated with 3780 point (point) transmission data into time-domain signals.

[0029] A pseudo-noise (PN) generator 40 generates a PN sequence to be used as a training ...

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Abstract

An apparatus for receiving an orthogonal frequency division multiplexing signal is disclosed. An apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal using a pseudo noise (PN) sequence as a training signal includes a frame synchronization unit for generating a frame synchronous signal of a received signal, a synchronous-signal remover for removing the frame- sync signal contained in a frame of the synchronous received signal and a Discrete Fourier Transform (DFT) unit for receiving the output signal of the synchronous-signal remover, and converting the received signal into a frequency-domain signal. Therefore, the apparatus prevents an OFDM signal from being distorted by a multipath channel, and increases a performance of channel equalization.

Description

technical field [0001] The present invention relates to an apparatus for receiving an Orthogonal Frequency Division Multiplexing (OFDM) signal, and more particularly, to an apparatus for receiving an OFDM signal to prevent the OFDM signal from being distorted due to a multipath channel. Background technique [0002] Recently, Tsinghua University in China proposed a new communication standard for realizing Chinese terrestrial digital television (hereinafter referred to as terrestrial DTV) broadcasting. The above-mentioned new communication standard proposed by Tsinghua University involves a broadcast specification called Terrestrial Digital Multimedia / Television Broadcasting (DMB-T). DMB-T uses a new modulation scheme called Time Domain Synchronous-OFDM (TDS-OFDM). [0003] An inverse discrete Fourier transform (IDFT) scheme is applied to transmission data modulated by a transmitter of a TDS-OFDM system in the same manner as in a cyclic prefix OFDM (CP-OFDM) scheme. [0004...

Claims

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Application Information

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IPC IPC(8): H04N7/00
CPCH04L27/2613H04L27/2605H04L25/0212H04L27/2656H04L27/2607H04L27/265H04L27/01H04J13/0022
Inventor 辛钟雄
Owner LG ELECTRONICS INC
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