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Ultra-wideband impulse signal modulation and demodulation method in fractional Fourier transform

A fractional Fourier, ultra-wideband pulse technology, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve problems such as low transmission efficiency, and achieve the effect of increasing transmission rate, simple implementation, and reasonable design.

Inactive Publication Date: 2008-11-19
HARBIN INST OF TECH
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Problems solved by technology

[0015] In order to solve the problem of low transmission efficiency when PAM, PPM and other modulation methods use one pulse as the carrier of information transmission for communication, a modulation and demodulation method for ultra-wideband pulse signals in the fractional Fourier transform domain is proposed.

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  • Ultra-wideband impulse signal modulation and demodulation method in fractional Fourier transform
  • Ultra-wideband impulse signal modulation and demodulation method in fractional Fourier transform
  • Ultra-wideband impulse signal modulation and demodulation method in fractional Fourier transform

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specific Embodiment approach 1

[0046] Specific implementation mode one: the modulation process in the fractional Fourier transform domain ultra-wideband pulse signal modulation and demodulation method described in this implementation mode is:

[0047] Step 1. Use the sender mapper 1 to transfer the information source b n The output multi-ary number is mapped to parallel two-way digital information d n (1) and d n (2) ;

[0048] Step 2, the first cutting signal generator 2 generates a corresponding real cutting signal c according to the parameters in the signal parameter memory 3 at the sending end 1 (t);

[0049] Step 3, the first Gaussian signal generator 4 generates a corresponding Gaussian signal c according to the parameters in the signal parameter memory 3 at the sending end 2 (t);

[0050] Step 4, digital information d n (1) with real chip signal c 1 (t) Under the action of the clock 7 at the sending end, the pulse signal m carrying digital information is obtained through the No. 1 modulator...

specific Embodiment approach 2

[0069] Specific embodiment two: the modulation process in the fractional Fourier transform domain ultra-wideband pulse signal modulation and demodulation method described in this embodiment is:

[0070] The modulation process is:

[0071] Step 1. Use the sender mapper 1 to transfer the information source b n The output multi-ary number is mapped to parallel two-way digital information d n (1) and d n (2) ;

[0072] Step 2, the first cutting signal generator 2 generates a corresponding real cutting signal c according to the parameters in the first sending end signal parameter memory 3-1 3 (t);

[0073] Step 3, the third chip signal generator 4-1 generates a corresponding real chip signal c according to the parameters in the second sending end signal parameter memory 3-2 4 (t);

[0074] Step 4, digital information d n (1) with real chip signal c 3 (t) Under the action of the clock 7 at the sending end, the pulse signal m carrying digital information is obtained throug...

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Abstract

Disclosed is an ultra broadband pulse signal modulation and demodulation method in fractional fourier transform field, which relates to an information modulation and demodulation technology in an ultra broadband system. The invention solves the problem of low transmission efficiency in the PAM, PPM modulation methods which use one channel of pulse as the information transmission carrier during communication. The process of the modulation is: divide the multi-ary digital information source into two parallel channels of digital information; and then through the transmitting antenna, transmit the transmitting pulse which is obtained by respectively modulating and adding the two channels of digital information with a real chip signal and a gaussian signal under the control of a transmitting clock. The process of the demodulation is: filter the received pulse signal and sample the signal under the control of the receiving end clock; then transform the signal to p order fractional fourier transform field; and then map the two channels of digital signal which is obtained by performing correlation demodulation on the transformed signal with the real chip signal and the gaussian signal into one channel of multi-ary digital information. The gaussian signal can also be real chip signal. The ultra broadband pulse signal modulation and demodulation method of the invention can be applied in ultra broadband pulse communication system.

Description

technical field [0001] The invention relates to an information modulation and demodulation technology in an ultra-wideband system. Background technique [0002] UWB wireless communication has broad application prospects in many fields such as wireless video, audio frequency, high-speed data transmission and home digital network. At present, in the field of ultra-wideband wireless communication, the modulation methods of information mainly include pulse amplitude modulation (PAM) and pulse position modulation (PPM), but no matter which modulation method is used, one pulse is used as the carrier of information transmission for communication. the transmission efficiency of the system. [0003] The fractional Fourier transform is a generalized Fourier transform. Let f(t) be the time-domain expression of the signal, and its p-order fractional Fourier transform is Then the p-order fractional Fourier transform of f(t) is: [0004] ( F ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04L27/00H04B1/7176
Inventor 沙学军吴宣利孟维晓邱昕林迪宁晓燕史军
Owner HARBIN INST OF TECH
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