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Interference suppression method for multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses

A system interference and interference suppression technology, applied in transmission systems, electrical components, etc., can solve problems such as lack of design flexibility, difficulty in simultaneous suppression and elimination, etc.

Active Publication Date: 2016-05-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing ultra-wideband systems lack design flexibility in the design of anti-multi-narrowband interference, multipath and multiple access interference, and it is difficult to simultaneously suppress and eliminate the above-mentioned typical interference

Method used

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  • Interference suppression method for multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses
  • Interference suppression method for multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses
  • Interference suppression method for multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses

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Experimental program
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Embodiment 1

[0037] A method for suppressing interference in a multi-band positive interactive complement ultra-wideband system based on nonlinear SqrtChirp pulses, wherein the ultra-wideband system includes a group of transmitting nodes and a single destination terminal 3, wherein the transmitting node group 1 contains multiple transmitting nodes , each transmitting node corresponds to a user, and it and the destination terminal are equipped with a single antenna, and the transmitting node sends multi-user signals to the destination terminal through the wireless multipath channel 2; the signal received by the destination terminal comes from the useful signal sent by the transmitting node group , other UWB user signals, and multi-narrowband interference signals, sub-band interference signals, multipath signals and Gaussian white noise signals that exist in the channel environment, the specific steps of the interference suppression method are as follows:

[0038] A. The UWB communication sys...

Embodiment 2

[0051] A kind of non-linear SqrtChirp pulse-based multi-band positive interactive complement ultra-wideband system interference suppression method as described in Embodiment 1, the difference is that in the step C, each sub-band matching sets a corresponding Chirp pulse w i The method of (t) is as follows:

[0052] 1) Use spectrum sensing technology to detect narrow-band interference frequency band, set a narrow-band interference signal, at this time UWB frequency band (f l , f h ) is divided into three sections, namely (f l , f 1 ), (f 1 , f 2 ) and (f 2 , f h ), f l and f h They are the lower limit frequency and upper limit frequency of the UWB frequency band, each sub-band bandwidth is greater than 500MHZ, and the narrow-band interference signal is located in the second sub-band (f 1 , f 2 )Inside;

[0053] 2) In the i-th (i=1,3) sub-band without narrow-band interference signal, use the linear Chirp pulse w whose waveform center is at t=0 i (t)=p(t)cos[2π(f 0 +iB...

Embodiment 3

[0056] A kind of non-linear SqrtChirp pulse-based multi-band positive interactive complementary ultra-wideband system interference suppression method as described in Embodiment 2, the difference is that after step 3), in order to further make the pulse pass through the narrow-band interference with the maximum instantaneous frequency At the sideband of the signal, to achieve more effective interference suppression, the instantaneous frequency of the nonlinear Chirp pulse can be corrected by the Sqrt operation as:

[0057] f w ( t ) = f l ( 1 ) + ( ...

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Abstract

The invention provides an interference suppression method for a multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses. The method comprises the following steps: dividing a UWB frequency band at a sending end to obtain L different sub-frequency bands, and matching and setting a corresponding Chirp pulse according to whether a narrow band interference signal exists in each sub-frequency band to realize high-speed and multi-rate transmission. According to the interference suppression method provided by the invention, the nonlinear Sqrt Chirp pulse is designed and adopted in the sub-frequency band with the narrow band interference signal, and the nonlinear Sqrt Chirp pulse can pass by the frequency band subjected to narrow band interference at the maximum instantaneous frequency to more effectively suppress the influence of the narrow band interference and meanwhile suppress multiple narrow band interference. The interference suppression method provided by the invention is used for carrying out spread spectrum modulation on each sub-frequency band Chirp pulse based on the good correlation properties of the orthogonal complementary code to eliminate the multiple access interference between users, the interference of the sub-frequency bands and multipath interference, and is used for simultaneously suppressing and eliminating multiple kinds of interference and effectively improving the antijamming capability and the communication performance of the system.

Description

technical field [0001] The invention relates to a method for suppressing interference of a multi-band positive interactive complement ultra-wideband system based on nonlinear SqrtChirp pulses, and belongs to the technical field of wireless communication. Background technique [0002] Ultra-wideband (UWB) technology has attracted more and more attention from academia and industry because of its low transmission power, easy implementation, strong anti-interference ability and high multipath resolution. UWB technology can provide high-speed and reliable data transmission between portable electronic devices and communication devices within a relatively short distance. The above characteristics make UWB technology have broad application prospects in wireless communication, radar, precise positioning and other fields, especially in indoor short-distance high-speed wireless communication with incomparable advantages. [0003] The extremely wide bandwidth and extremely low transmis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/719
CPCH04B1/719
Inventor 白智全孔凡堂彭珊珊张标
Owner SHANDONG UNIV
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