OFDM transmitter and method for inserting pilot frequency into OFDM signal

A pilot signal and orthogonal frequency division technology, applied in the field of OFDM transmitters, can solve the problems of reduced data transmission and reduced data volume of OFDM receivers, etc.

Inactive Publication Date: 2004-01-07
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that when the PN sequence is used for a long time, the amount of data transmitted to the OFDM receiver decreases, resulting in a decrease in data transmission

Method used

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  • OFDM transmitter and method for inserting pilot frequency into OFDM signal
  • OFDM transmitter and method for inserting pilot frequency into OFDM signal
  • OFDM transmitter and method for inserting pilot frequency into OFDM signal

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Embodiment Construction

[0040] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0041] Fig. 2 is a block diagram showing an OFDM transmitter according to a preferred embodiment of the present invention.

[0042] The OFDM transmitter includes a forward error correction (FEC) unit 100, a pilot insertion unit 200, an N-inverse discrete Fourier transform (N-IDFT) unit 300, a guard interval (GI) insertion unit 400, a pilot generator 500, a pseudonoise (PN) sequence insertion unit 600 , pulse shaping filter unit 700 , radio frequency (RF) unit 600 .

[0043] The FEC unit 100 encodes incoming data for correcting errors that may occur during data transmission.

[0044] After FEC, the pilot insertion unit 200 inserts at least two pilot data P' into the parallel data, so that the receiving end can obtain synchronization more easily. If the number of pilot data P' is, for example, an odd number, one pilot data P' may be...

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Abstract

An OFDM transmitter comprises a FEC unit used for encoding the input data to correct the errors occuring at the receiving machine during the data transmission; a pilot insertion unit used for inserting at least two pilot data to the effective data; an IDFT unit used for modulating the encoded data which have pilot data and are defined as OFDM code elements; a guard interval (GI) insertion unit used for insertion of GI for barrage jamming between OFDM code elements;a pseudo noise (PN) sequence insertion unit used for inserting PN sequences and pilot signals into the OFDM code elements, wherein the pilot signals correspond to the pilot data inserted into the OFDM code elements; a pulse shaping filtering unit used for filtering the OFDM code elements; and a RF unit used for upconversing the OFDM signals into RF signals and transmitting them to channels. Herein, at least two pilot signal of continuance phase are inserted into the OFDM code element frequency spectrum and the entire PN sequence, then the receiving side can easily realize the synchronization.

Description

technical field [0001] The present invention relates generally to an Orthogonal Frequency Division Multiplexing (OFDM) transmitter, and more particularly to an OFDM transmitter for improving reception efficiency. Background technique [0002] In general, a broadcasting system of High Definition Television (HDTV) can be roughly divided into an image encoding unit and an image modulation unit. The image encoding unit compresses digital data of about 1Gbps input from a high-definition image source into data of 15-18Mbps. The image modulation unit sends digital data of tens of Mbps to the receiving end through a band-limited channel of about 6-8 MHz. HDTV uses a terrestrial simulcast method using very high frequency / ultra high frequency (VHF / UHF) allocated for television broadcasting. In consideration of the terrestrial simulcast environment, the modulation method of the broadcast system for HDTV is required to satisfy the following conditions. [0003] First of all, the modu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/36
CPCH04L27/26134H04L27/2628H04J13/0022
Inventor 朴赞燮金俊守
Owner SAMSUNG ELECTRONICS CO LTD
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