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Low power consumption asymmetric Fourier change modulation/demodulation device

A Fourier transform and demodulation device technology, applied in the field of modulation/demodulation devices, can solve problems such as difficulties, and achieve the effects of reducing power consumption, simple hardware design, and reducing power consumption efficiency

Inactive Publication Date: 2007-01-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current 2G or future 3G mobile communication, there are still great difficulties in realizing complete point-to-point video communication

Method used

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  • Low power consumption asymmetric Fourier change modulation/demodulation device
  • Low power consumption asymmetric Fourier change modulation/demodulation device
  • Low power consumption asymmetric Fourier change modulation/demodulation device

Examples

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Embodiment Construction

[0026] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0027] refer to figure 2 , figure 2 It is a low power consumption asymmetric Fourier transform modulation device according to a preferred embodiment of the present invention. Suppose M=4, N=4096 (here, the values ​​of M and N are examples, those skilled in the art can easily adopt other positive integer values). After the 4 sets of source information are composed of OFDM symbols with the number of subcarriers N=4096 through their respective units 20, 22...24, the ordering unit 40 places each set of source signals at equal intervals in an OFDM symbol with a length of N=4096. symbols, and then modulated and transmitted by the N=4096-point IFFT unit 42. In different digital information transmission systems, the respective units 20, 22...24 of the four sets of information source information may also include their own coding interleav...

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Abstract

This invention relates to a low power loss asymmetrical Fourier transformation modulation / demodulation device including: channel M source signal input unit, a signal regulation unit and point N IFFT unit, in which, channel M source signal unit inputs its signals to be coupled to the regulation unit, the output of which is emitted after point N IFFT unit modulates it. The demodulation device includes: a phase regulation unit, an adding unit and point N / M FFT unit, in which, the output of the phase regulation unit is output to the adding unit and the output of which is coupled to the input of point N / M FTT unit.

Description

technical field [0001] The invention relates to a modulation / demodulation device in digital information transmission, in particular to an asymmetric Fourier transform modulation / demodulation device, which reduces system power consumption from the physical layer. Background technique [0002] With the launch of digital TV terrestrial broadcasting in countries around the world and the rapid development of mobile communications, people hope to watch or listen to the latest news, songs or Other video programs, etc., so that terrestrial TV broadcasting has shifted from the traditional "fixed and family reception" to the broader "mobile and individual reception", providing a new mobile multimedia entertainment method. [0003] At the same time, the rapid development of cellular mobile communication has greatly improved the mobility of people's living space and cultivated a huge user base. In this mobile world, users desperately want to receive TV shows and other media wherever an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 归琳郭翘刘勃
Owner SHANGHAI JIAO TONG UNIV
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