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OFDM transmitter inserting pseudo noise sequence into OFDM symbols after controlling pseudo noise queue

A pseudo-random noise, orthogonal frequency division technology, applied in the field of OFDM transmitters, can solve the problem of inaccurate restoration of OFDM signals and so on

Inactive Publication Date: 2006-11-29
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, OFDM receivers often inaccurately reproduce the received OFDM signal

Method used

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  • OFDM transmitter inserting pseudo noise sequence into OFDM symbols after controlling pseudo noise queue
  • OFDM transmitter inserting pseudo noise sequence into OFDM symbols after controlling pseudo noise queue
  • OFDM transmitter inserting pseudo noise sequence into OFDM symbols after controlling pseudo noise queue

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Embodiment Construction

[0028] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0029] like figure 2 As shown, according to an embodiment of the present invention, an OFDM transmitter includes a forward error correction (FEC) unit 100, an inverse discrete Fourier transform (IDFT) unit 200, a guard interval (GI) insertion unit 300, and a PN generator 400 , a pseudo-random noise (PN) sequence insertion unit 500, a pulse shaping unit 600 and a radio frequency (RF) up-conversion unit 700.

[0030] The FEC unit 100 encodes OFDM symbols for correcting errors that occur during transmission. IDFT unit 200 performs IDFT on the OFDM symbols encoded at FEC encoding unit 100 .

[0031] After the IDFT of the IDFT unit 200, the GI insertion unit 300 inserts a guard interval (GI) into OFDM symbols to suppress inter-signal interference. At this time, the size pattern of GI corresponds to 1 / 6, 1 / 9, 1 / 12, 1 / 20, or 1 / 30 of th...

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Abstract

The present invention provides a orthogonal frenquency division multiplexing (OFDM) transmitter. The OFDM transmitter includes: A forward error correcting coding unit for coding the input datas; An inverse disperse fourier transform unit transforms said coding datas into orthogonal frequency division multiplexing(OFDM) symbols. A pseudo random noise insertion unit for inserting pseudo random noise sequence an forward synchronous signal / backward synchronous signal into the OFDM symbols. A pulse shaping unit filters the OFDM symbols inserted with pseudo random noise sequence . A radio frequency transforming unit transforms OFDM symbols of said pulse shaping filter into radio signal.

Description

[0001] This application is a divisional application of a patent application with the filing date of November 6, 2002, the application number of 02149817.2, and the title of "Orthogonal Frequency Division Multiplexing Transmitter for Adjusting Pseudo-Random Noise Sequence and Inserting It into Symbols". technical field [0002] The present invention generally relates to an Orthogonal Frequency Division Multiplexing (OFDM) transmitter and an OFDM transmitting method thereof, and more particularly relates to transmitting an OFDM symbol in a Time Domain Synchronous (TDS) symbol before said OFDM symbol is transmitted. An OFDM transmitter with inserted pseudorandom noise (PN) sequence and guard interval (GI) and its OFDM transmission method. Background technique [0003] 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 1Gbp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/26H04N7/015H04L27/36
CPCH04L27/2634H04L27/264H04L1/0042H04J11/00H04J2011/0006
Inventor 丁海主郭征元
Owner SAMSUNG ELECTRONICS CO LTD
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