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OFDM transmitter for raising transfer rate and signal compressing method

A transmitter and signal technology, which is applied in the field of transmitters with even and odd functions to increase the transmission rate, and can solve the problem of low signal data rate

Inactive Publication Date: 2007-05-23
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, since the IFFT unit 20 does not require any processing to transmit the modulated signal in the time domain, the modulated time domain signal must allocate a large amount of time to OFDM symbols
As a result, signals are sent at a lower data rate than possible

Method used

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  • OFDM transmitter for raising transfer rate and signal compressing method
  • OFDM transmitter for raising transfer rate and signal compressing method
  • OFDM transmitter for raising transfer rate and signal compressing method

Examples

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Embodiment Construction

[0028] An OFDM transmitter according to an embodiment of the present invention and a signal compression method therein will be described in detail below with reference to the accompanying drawings.

[0029] Figure 3 is a schematic block diagram illustrating an OFDM transmitter in an embodiment of the present invention. In particular, FIG. 3 is a detailed block diagram illustrating a TDS-OFDM transmitter for explaining a process of modulating frequency-domain OFDM data into a time-domain OFDM signal and compressing the OFDM signal.

[0030] That is, data input to the OFDM transmitter is error-coded by an FEC unit 10, and modulated by an IFFT unit 20 into a time-domain OFDM signal. Subsequently, the OFDM signal modulated by the IFFT unit 20 passes through the even function extraction unit 210, the odd function extraction unit 230, the first and second selection units 213 and 233, and the first and second interception units 215 and 235 are compressed into a predetermined The sig...

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Abstract

An OFDM transmitter capable of improving a transmission rate of OFDM signals and a method for compressing signals thereof are provided to increase a transmission rate of whole data by reducing the length of one OFDM symbol. An inverse fourier transform unit(200) transforms OFDM(Orthogonal Frequency Division Multiplexing) signals of a frequency domain into OFDM signals of a time domain through inverse fourier transform. An even function extracting unit(210) extracts an even function signal symmetrical to a y axis from the OFDM signals of the time domain. An odd function extracting unit(230) extracts an odd function signal symmetrical to the origin from the OFDM signals of the time domain. The even function signal is formed of the sum of a first even function signal and a second even function signal. A first selecting unit(213) selects anyone of the first even function signal and the second even function signal. The odd function signal is formed of the sum of a first odd function signal and a second odd function signal. A second selecting unit(233) selects anyone of the first odd function signal and the second odd function signal. A first cutting unit(215) takes one half signal of the selected even function signal. A second cutting unit(235) takes one half signal of the selected odd function signal.

Description

technical field [0001] The present invention relates to an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) transmitter, in particular to a transmitter that increases transmission rate by using even and odd functions of OFDM signals. Background technique [0002] In general, a high-definition television (HDTV) broadcast system can be roughly divided into an image encoding unit and a modulation unit. The image coding unit compresses the digital data of about 1Gbps input from the high-definition image source into data of 15-18Mbps. The modulation unit sends digital data of tens of Mbps to the receiving end through a frequency band channel of approximately 6-8MHzd. Digital HDTV broadcasting adopts the terrestrial simulcast method by using the very high frequency / ultra high frequency (VHF / UHF) allocated to normal television broadcasting. The modulation method of the broadcast system used for HDTV must satisfy the following condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04L27/12H04N7/015
CPCH04J13/0022H04N7/015H04L27/26362
Inventor 朴赞燮
Owner SAMSUNG ELECTRONICS CO LTD
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