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Method and apparatus for transmission, and medium

A technology of a sending device and a sending method, which is applied to digital transmission systems, electrical components, modulated carrier systems, etc., and can solve problems such as effective use of unfavorable frequencies and decreased frequency use efficiency

Inactive Publication Date: 2002-05-01
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, setting the above-mentioned guard band will reduce the efficiency of frequency utilization, which is not conducive to the effective use of frequencies.

Method used

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  • Method and apparatus for transmission, and medium
  • Method and apparatus for transmission, and medium
  • Method and apparatus for transmission, and medium

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] Fig. 2 is a block diagram showing an embodiment of a transmitter to which the present invention is applied. The information string input to the OFDM modulation circuit 2 of the transmitter 1 is error-corrected and coded by the error correction coding unit 11 , and output to the frame formation circuit 12 . The frame forming circuit 12 forms a frame composed of symbols for synchronization, symbols for service identification, and symbols for information transmission into one frame. The framed signal is input to an IFFT (Inversed Fast Fourier Transform) computing unit 13 , subjected to inverse Fourier transform (OFDM modulation), and output to a guard interval adding unit 14 .

[0029] The guard interval adding unit 14 adds a guard interval to the input signal. In the OFDM modulation scheme, as shown in FIG. 3 , for example, a carrier as a modulation wave modulated by 64QAM (Quadrature Amplitude Modulation: Quadrature Amplitude Modulation) is added to k to generate a tran...

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PUM

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Abstract

Influences of adjacent signals are eliminated with no guard band used. A phase comparator (21) compares a window signal supplied from a frequency divider (22) with a reference window signal input to a PLL circuit (4), and provides the result of comparison for an LPF (23). The LPF (23) extracts low-frequency components from the input signal and supplies them to a voltage-controlled oscillator (24). The voltage-controlled oscillator (24) supplies an output signal to an OFDM modulator circuit (2) as a clock signal and to a frequency divider (22). The frequency divider (22) divides the input signal to generate a new window signal, which is supplied to an IFFT processor (13). The new window signal is also supplied to a PLL circuit (5), which in turn uses the supplied signal to generate a clock signal for controlling a frequency modulator circuit (3).

Description

technical field [0001] The present invention relates to a transmission device, method, and medium, and more particularly, to a transmission device, method, and medium that can detect a desired signal correctly without providing a guard band for preventing interference from adjacent signals. Background technique [0002] The OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) transmission method is well known as a transmission method suitable for digital transmission using ground waves because of its anti-multipath interference characteristics. The OFDM transmission method adopts a terrestrial digital satellite broadcasting method (hereinafter referred to as a broadband ISDB-T method) and a terrestrial digital wireless broadcasting method (hereinafter referred to as a narrowband ISDB-T method) as tentative methods of the Electric Development Technology Council. [0003] When starting digital broadcasting, it should be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/26
CPCH04L27/2626H04L27/26265
Inventor 池田康成池田保冈田隆宏
Owner SONY CORP