Unlock instant, AI-driven research and patent intelligence for your innovation.
Demodulation method for multi-carrier differential chaotic systems based on low-rank matrix estimation
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A low-rank matrix, chaotic system technology, applied in the modulation carrier system, multi-frequency code system, transmission system and other directions, can solve the problems of insufficient information utilization, not considering the structural characteristics of the transmitted signal in the multi-carrier differential chaotic system, etc. Superior performance, improving bit error rate performance, and reducing the effect of bit error rate
Active Publication Date: 2021-06-08
SUN YAT SEN UNIV
View PDF9 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] In order to overcome the existing MC-DCSK system, the existing MC-DCSK system only uses the properties of multi-carriers to remove the delay line and improve energy and spectrum utilization, and does not consider the structural characteristics of the transmitted signals in the multi-carrier differential chaotic system, and the existence of information Provide a demodulation method for multi-carrier differential chaotic systems based on low-rank matrix estimation due to insufficient utilization of technical defects
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0062] Such as figure 1 As shown, the multi-carrier differential chaotic system demodulation method based on low-rank matrix estimation includes the following steps:
[0063] S1: Process data and send signals on the transmitter;
[0064] S2: The receiving end separates the received signal;
[0065] S3: Using a matched filter to filter the separated signal;
[0066] S4: Sampling the filtering result and performing conversion calculation, and completing signal demodulation according to the calculation result.
[0067] More specifically, such as figure 2 As shown, the steps of the step S1 specifically include:
[0068] S11: Convert serial data into parallel data through serial-to-parallel conversion [s 1 ,s 2 ,...,s M-1 ];
[0069] S12: The chaotic sequence generator generates a chaotic sequence of length β[x 1 , x 2 ,...,x β ], which is shaped by root-square raised cosine roll-off filter to generate chaotic spreading code x(t);
[0070] S13: parallel data[s 1 ,s 2...
Embodiment 2
[0108] More specifically, the simulation is carried out on the basis of Embodiment 1. The simulation system is a multi-carrier differential chaotic communication system composed of an MC-DCSK transmitter and an MC-DCSK receiver with low-rank matrix estimation. The modulation method adopts binary phase shift keying (Binary Phase Shift Keying, BPSK). Each wireless link is an independent Rayleigh distributed channel, and the noise signal is additive white Gaussian noise. By comparing the bit error rate performance (Bit Error Rate, BER) of the traditional MC-DCSK receiver and the MC-DCSK receiver based on low-rank matrix estimation with the same MC-DCSK transmitter, the signal-to-noise ratio (Signal-to -Noise Ratio, SNR), to describe the improvement of the low-rank matrix estimation to the BER performance of the MC-DCSK receiver.
[0109] In the specific implementation process, as the multipath expression described in formula (2), when L=1 and λ l =1, this formula represents the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The multi-carrier differential chaotic system demodulation method based on low-rank matrix estimation provided by the present invention includes the following steps: processing data on the transmitter and sending signals; the receiving end separates the received signals; The separated signal is filtered; the filtering result is sampled and converted to calculation, and the demodulation of the signal is completed according to the calculation result. The multi-carrier differential chaotic system demodulation method based on low-rank matrix estimation provided by the present invention uses the structural characteristics of the transmitted signal in the multi-carrier system and combines the low-rank matrix estimation method to restore a low-rank matrix from the received signal, thereby reducing The noise of the received signal matrix; in the subsequent differential chaotic signal demodulation process, the noise interference is effectively suppressed, and finally the effect of reducing the bit error rate is achieved.
Description
technical field [0001] The invention relates to the technical field of chaotic communication, and more specifically, to a demodulation method of a multi-carrier differential chaotic system based on low-rank matrix estimation. Background technique [0002] The low complexity, high security, and superior anti-multipath and anti-jamming properties of chaotic sequences have made chaotic modulation widely studied in the past few decades. According to whether chaotic synchronization is required at the receiving end, digital chaotic modulation schemes can be divided into two types: coherent and non-coherent. Reference chaotic signal, so non-coherent chaotic modulation has stronger practicability. Among the existing incoherent chaotic modulation techniques, Differential Chaos Shift Keying (DCSK) [1] is widely accepted due to the removal of complex chaotic synchronization circuits and the ability to provide better bit error rate performance. However, due to the need to transmit ref...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More