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Time-domain synchronous orthogonal frequency-division multiplexing transmitter with phase alternation signal suppression filtering

A transmitter and signal technology, applied in the field of TDS-OFDM transmitters, can solve the problems of limited recovery ability of error correction algorithm and unrecoverable lost data, etc.

Inactive Publication Date: 2003-12-24
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the recovery ability of the error correction algorithm is limited, so some lost data cannot be recovered

Method used

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  • Time-domain synchronous orthogonal frequency-division multiplexing transmitter with phase alternation signal suppression filtering
  • Time-domain synchronous orthogonal frequency-division multiplexing transmitter with phase alternation signal suppression filtering
  • Time-domain synchronous orthogonal frequency-division multiplexing transmitter with phase alternation signal suppression filtering

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Embodiment Construction

[0038] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0039] Figure 5 is a preferred embodiment of the OFDM transmitter according to the invention. The OFDM transmitter has an FEC (Forward Error Correction) unit 100, a frame forming unit 400, an IDFT (Inverse Discrete Fourier Transform) unit 500, a GI (Guard Interval) insertion unit 600, a synchronization insertion unit 700, a PAL rejection filter 200, a pulse The shaping filter unit 800 and the RF unit 900 .

[0040] The FEC unit 100 encodes input TS data to correct errors generated during transmission.

[0041] When the PAL suppression filter signal is in the OFF state, the frame forming unit 400 inserts the pilot signal or transmission parameter signaling (TPS) into the encoded TS data; when the PAL suppression filter signal is in the ON state, the frame forming unit 400 A null signal is inserted and arranged at a frequency wher...

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Abstract

An OFDM transmitter and a signal processing method thereof are provided. An OFDM transmitter includes a FEC unit for coding data of transmitting stream(TS); a frame format unit inserts pilot signal or transmitting parameter signal (TPS) or null signal into coding TS data and inserts pilot signal or TPS into coding TS data; an inverse discrete Fourier transformer inverse-discrete-Fourier-transforms the coded data which the null signal has been inserted into OFDM signal of time domain; a GI (guide interval) inserting unit inserts a GI into an OFDM symbol outputing from the IDFT unit; a synchronous insertion unit inserts PN sequence into each OFDM signal of GI which having GI inserting unit; a PAL suppression filter removes PAL component from OFDM symbol outputing from the synchronous insertion unit, or transmits the OFDM symbol without filtering; a pulse shaping filter for filtering OFDM signal outputing from the PAL suppression filter, or filtering OFDM signal outputing from the synchronous insertion unit; a RF upconversing unit for upconversing OFDM signal after filtering into radio frequency.

Description

technical field [0001] The present invention relates to a TDS-OFDM (Time Domain Synchronous Orthogonal Frequency Division Multiplexing) transmitter, and more particularly to a TDS-OFDM capable of transmitting digital broadcast signals without being affected by PAL (Phase Alternative Line) broadcast signals sender. Background technique [0002] In general, OFDM (Orthogonal Frequency Division Multiplexing) technology is widely used in transmission technologies such as DAB (Digital Audio Broadcasting), WLAN (Wireless Local Area Network), and WATM (Wireless Asynchronous Transfer Mode). OFIM involves modulating data onto a large number of carriers using FDM (Frequency Division Modulation) techniques. The OFDM method is similar to conventional FDM, but it transmits at a high data rate by transmitting data maintaining an orthogonal characteristic among most subcarriers, and thus has higher frequency efficiency. [0003] The current digital broadcast channel occupies the next chan...

Claims

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Application Information

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IPC IPC(8): H04N7/015H03M13/25H04J11/00H04L27/36H04N5/14H04N7/025
CPCH04L27/2634H04L1/0042H04J13/0022
Inventor 朴赞燮赵景翼金纪甫
Owner SAMSUNG ELECTRONICS CO LTD
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