CN103957029A - QPSK-DS communication detecting method based on delay multiplication - Google Patents
QPSK-DS communication detecting method based on delay multiplication Download PDFInfo
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Abstract
The invention discloses a QPSK-DS communication detecting method based on delay multiplication. A system is initialized and begins to scan a target frequency band to amplify signals entering the system from the radio frequency front end, radio frequency signals are converted into fixed middle frequency to be amplified through a difference frequency method, digital signals can be achieved through analog-digital conversion, delay multiplication operation is carried out, digital lowpass filtering is carried out to obtain lowpass signals, and a frequency spectrum of the lowpass signals can be achieved through an FFT algorithm. The QPSK-DS communication detecting method has the advantages of adopting a linear and non-linear processing method to achieve full detection on QPSK-DS communication through simple comprehensive analysis and processing on time frequency domains and being simple to achieve, strong in operability and strong in capacity adapting to low signal to noise ratio. Meanwhile, the method adopts the middle frequency analysis instead of radio frequency or baseband processing to avoid high requirements for performance of processing capacity of a receiver as possible. Furthermore, the method can achieve real-time processing easily and is strong in practicability.
Description
Technical field
The present invention relates to a kind of QPSK-DS communication check method based on delay multiplication.
Background technology
Existing spread-spectrum signal Check processing concrete grammar feature is as follows: 1) manyly in base band aspect, launch research, and want directly from unknown signaling demodulation in reality, to restore baseband signal be abnormal difficult; 2) Higher order Statistics or the cycle specificity analytic approachs of adopting more, algorithm is realized need to carry out the search of hyperspace, and amount of calculation is large, and algorithm is realized complicated, the computing capability that is stored in to receiver system requires too highly, to such an extent as to cannot realize or cannot real-time implementation; 3) more spininess is not suitable for the detection of QPSK-DS communication to its concrete grammar of BPSK-DS communication expansion research; 4) discussing in the some concrete aspect often just detecting for signal of communication, can not realize for the complete detection of QPSK-DS communication and estimating.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new QPSK-DS communication check method based on delay multiplication.
Technical scheme of the present invention is as follows: a kind of QPSK-DS communication check method based on delay multiplication, comprise,
A, at Mid Frequency, the unknown communication that may exist is analyzed, effectively reduced the requirement to sampling rate and data processing and storage capacity;
B, at Mid Frequency, the unknown communication that may exist is analyzed, avoided to greatest extent non-collaboration communication directly to adopt baseband analyzer to process an existing carrier frequency accurate estimation difficult problem in detecting;
C, employing are done delay multiplication to the signal after digitlization and are processed, modern advanced calculated signals treatment technology easy to use;
The simple process such as D, employing low pass, high-pass filtering realize the rejecting for subsequent processes existing " unwanted signal composition/interference/noise ", have effectively improved the signal to noise ratio of signal;
The frequecy characteristic of E, the quick calculation process technology of employing FFT picked up signal, completes the discovery of QPSK-DS communication and realizes the estimation to unknown system important communication parameter spreading rate by searching for discrete spectral line/spectrum peak, and alignment processing is simple, workable;
The method of F, the periodic feature choice for use autocorrelation analysis that shows for signal in reception & disposal process highlights system features and completes the estimation to system important communication parameter symbol period, and its processing has solid theory and technical foundation comprehensively;
G, the intersection that high communication number is done between two kinds of signal components having retained after square operation has effectively been avoided in earlier stage processing are mixed the appearance of disturbing, and to have maximally utilised carrier frequency information wherein provide part, and algorithm process has stronger robustness;
H, for the final extraction of carrier frequency information, use FFT conversion to reach, the device of available use is many, and corresponding algorithm is ripe efficient;
I, detect to realize the mode that not only can adopt the mode of software programming but also can adopt software and hardware combining, Check processing strong adaptability, can reach the detection of wide-band communication is scanned by the unknown signaling of variant frequency range being converted to the mode of fixed intermediate frequency.
A QPSK-DS communication check method based on delay multiplication, comprises, and step 1, system initialization also launch the scanning to target frequency bands, and the signal that radio-frequency front-end is entered to system carries out method;
Adopt the methods such as difference frequency that radiofrequency signal is gone to and determines intermediate frequency and amplify;
Step 2, analog-to-digital conversion obtain digitized signal;
Step 3, enforcement delay multiplication calculation process;
Step 4, enforcement digital low-pass filtering are processed, and obtain low-pass signal;
Step 5, use fft algorithm are tried to achieve the frequency spectrum of low-pass signal;
Step 6, search frequency domain peak value (discrete spectral line), if there is no discovery/not obvious peak value (discrete spectral line), go to step 1), if find/exist obvious peak value (discrete spectral line), enter next step;
Step 7, enforcement, to estimating the estimation of spreading rate, are carried out following work simultaneously:
A) low-pass signal of step 5) gained is done to auto-correlation computation, the peak value of Search Results sequence, realizes the estimation for unknown QPSK-DS signal of communication symbol period by the interval of adjacent peak value then;
B) signal of step 4) processing gained is done to high-pass filtering and process (filtering low frequency composition, acquisition is for estimating the useful high frequency composition of carrier frequency), then do square operation and FFT transform analysis, and the final estimation to carrier frequency by the realization of search discrete spectral line/spectrum peak;
Step 8, QPSK-DS communication check are finished dealing with,, receiver can proceed to conventional signal of communication reception and the demodulation reduction of information.
Adopt such scheme, the invention has the beneficial effects as follows: adopt method linear and Nonlinear Processing, by simple time-frequency domain comprehensive analysis processing, realize the complete detection for QPSK-DS communication, algorithm is realized simple, workable, adapt to low signal-to-noise ratio ability strong; Meanwhile, during designed method adopts, frequency analysis rather than radio frequency or Base-Band Processing have been avoided the excessive demand for aspect performances such as receiver disposal abilities most possibly, are easy to reach real-time processing, practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiments of the invention 1.
Embodiment
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.In this specification and accompanying drawing thereof, provided preferred embodiment of the present invention, still, the present invention can realize in many different forms, is not limited to the described embodiment of this specification.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when a certain element is fixed on another element, comprise this element is directly fixed on to this another element, or this element is fixed on to this another element by least one other element placed in the middle.When an element connects another element, comprise this element is directly connected to this another element, or this element is connected to this another element by least one other element placed in the middle.
One embodiment of the present of invention are that technical scheme of the present invention is as follows: a kind of QPSK-DS communication check method based on delay multiplication, comprise,
J, at Mid Frequency, the unknown communication that may exist is analyzed, effectively reduced the requirement to sampling rate and data processing and storage capacity;
K, at Mid Frequency, the unknown communication that may exist is analyzed, avoided to greatest extent non-collaboration communication directly to adopt baseband analyzer to process an existing carrier frequency accurate estimation difficult problem in detecting;
L, employing are done delay multiplication to the signal after digitlization and are processed, modern advanced calculated signals treatment technology easy to use;
The simple process such as M, employing low pass, high-pass filtering realize the rejecting for subsequent processes existing " unwanted signal composition/interference/noise ", have effectively improved the signal to noise ratio of signal;
The frequecy characteristic of N, the quick calculation process technology of employing FFT picked up signal, completes the discovery of QPSK-DS communication and realizes the estimation to unknown system important communication parameter spreading rate by searching for discrete spectral line/spectrum peak, and alignment processing is simple, workable;
The method of O, the periodic feature choice for use autocorrelation analysis that shows for signal in reception & disposal process highlights system features and completes the estimation to system important communication parameter symbol period, and its processing has solid theory and technical foundation comprehensively;
P, the intersection that high communication number is done between two kinds of signal components having retained after square operation has effectively been avoided in earlier stage processing are mixed the appearance of disturbing, and to have maximally utilised carrier frequency information wherein provide part, and algorithm process has stronger robustness;
Q, for the final extraction of carrier frequency information, use FFT conversion to reach, the device of available use is many, and corresponding algorithm is ripe efficient;
R, detect to realize the mode that not only can adopt the mode of software programming but also can adopt software and hardware combining, Check processing strong adaptability, can reach the detection of wide-band communication is scanned by the unknown signaling of variant frequency range being converted to the mode of fixed intermediate frequency.
The invention provides a kind of QPSK-DS signal of communication detects and method for parameter estimation, user is according to analysis and feature extraction to supervision/reconnaissance receiver output signal in certain radio environment, the judgement that realization has or not echo signal and complete the estimation to relevant signal parameter, simultaneously for the succeeding target signal extraction based on this step work is reduced and is laid necessary basis with communication information demodulation.Its specific implementation comprises following analyzing and processing step: (non-cooperation) receiver is searched for/scanned relevant frequency range, radio frequency amplifying circuit is being sent into intermediate frequency process part to execution down-conversion after entering the signal of receiver to do amplification, enforcement analog-to-digital conversion after intermediate frequency amplifies; Intermediate-freuqncy signal after digitlization is done delay multiplication computing and done low pass processing and obtain low-pass signal, gained low-pass signal is implemented to FFT computing, to FFT result search spectrum peak, by checking, whether there is obvious discrete spectrum peak/line realization is to the Detection of Existence of QPSK-DS communication and complete the estimation of important parameter spreading rate to received signal; Gained low-pass signal in previous step processing procedure is carried out related calculation, by checking whether to occur the achieve a butt joint estimation of collection of letters symbol period of obvious relevant peaks; The delay multiplication signal of aforementioned intermediate-freuqncy signal is done to high-pass filtering, square operation, FFT transform analysis, by the discrete spectral line after search FFT conversion achieve a butt joint collections of letters carrier frequency estimation and can further determine the existence of QPSK-DS signal of communication, by above a series of Treatment Analysis, complete the non-cooperative detection that QPSK-DS is communicated by letter.The advantage of institute's extracting method: by analyzing at intermediate-frequency band, greatly reduce on the one hand the requirement to receiver sampling rate, avoided on the other hand a difficult problem for the existing carrier frequency accurate estimation of Base-Band Processing in non-collaboration communication input, especially, institute's extracting method is directly reached testing goal by Nonlinear Processing means, avoided such as high-order statistic, in the processing such as cyclic-spectral Analysis, existing amount of calculation is large, need to carry out the problem of multi-dimensional search, particularly, institute's extracting method can complete the accurate estimation of a plurality of parameters of detection signal simultaneously and be easy to realize.
A QPSK-DS communication check method based on delay multiplication, comprises, and step 1, system initialization also launch the scanning to target frequency bands, and the signal that radio-frequency front-end is entered to system carries out method;
Adopt the methods such as difference frequency that radiofrequency signal is gone to and determines intermediate frequency and amplify;
Step 2, analog-to-digital conversion obtain digitized signal;
Step 3, enforcement delay multiplication calculation process;
Step 4, enforcement digital low-pass filtering are processed, and obtain low-pass signal;
Step 5, use fft algorithm are tried to achieve the frequency spectrum of low-pass signal;
Step 6, search frequency domain peak value (discrete spectral line), if there is no discovery/not obvious peak value (discrete spectral line), go to step 1), if find/exist obvious peak value (discrete spectral line), enter next step;
Step 7, enforcement, to estimating the estimation of spreading rate, are carried out following work simultaneously:
A) low-pass signal of step 5) gained is done to auto-correlation computation, the peak value of Search Results sequence, realizes the estimation for unknown QPSK-DS signal of communication symbol period by the interval of adjacent peak value then;
B) signal of step 4) processing gained is done to high-pass filtering and process (filtering low frequency composition, acquisition is for estimating the useful high frequency composition of carrier frequency), then do square operation and FFT transform analysis, and the final estimation to carrier frequency by the realization of search discrete spectral line/spectrum peak;
Step 8, QPSK-DS communication check are finished dealing with,, receiver can proceed to conventional signal of communication reception and the demodulation reduction of information.
Adopt such scheme, the invention has the beneficial effects as follows: adopt method linear and Nonlinear Processing, by simple time-frequency domain comprehensive analysis processing, realize the complete detection for QPSK-DS communication, algorithm is realized simple, workable, adapt to low signal-to-noise ratio ability strong; Meanwhile, during designed method adopts, frequency analysis rather than radio frequency or Base-Band Processing have been avoided the excessive demand for aspect performances such as receiver disposal abilities most possibly, are easy to reach real-time processing, practical.
It should be noted that, above-mentioned each technical characterictic continues combination mutually, forms the various embodiment that do not enumerate in the above, is all considered as the scope that specification of the present invention is recorded; And, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (2)
1. the QPSK-DS communication check method based on delay multiplication, its feature is as follows:
A, at Mid Frequency, the unknown communication that may exist is analyzed, effectively reduced the requirement to sampling rate and data processing and storage capacity;
B, at Mid Frequency, the unknown communication that may exist is analyzed, avoided to greatest extent non-collaboration communication directly to adopt baseband analyzer to process an existing carrier frequency accurate estimation difficult problem in detecting;
C, employing are done delay multiplication to the signal after digitlization and are processed, modern advanced calculated signals treatment technology easy to use;
The simple process such as D, employing low pass, high-pass filtering realize the rejecting for subsequent processes existing " unwanted signal composition/interference/noise ", have effectively improved the signal to noise ratio of signal;
The frequecy characteristic of E, the quick calculation process technology of employing FFT picked up signal, completes the discovery of QPSK-DS communication and realizes the estimation to unknown system important communication parameter spreading rate by searching for discrete spectral line/spectrum peak, and alignment processing is simple, workable;
The method of F, the periodic feature choice for use autocorrelation analysis that shows for signal in reception & disposal process highlights system features and completes the estimation to system important communication parameter symbol period, and its processing has solid theory and technical foundation comprehensively;
G, the intersection that high communication number is done between two kinds of signal components having retained after square operation has effectively been avoided in earlier stage processing are mixed the appearance of disturbing, and to have maximally utilised carrier frequency information wherein provide part, and algorithm process has stronger robustness;
H, for the final extraction of carrier frequency information, use FFT conversion to reach, the device of available use is many, and corresponding algorithm is ripe efficient;
I, detect to realize the mode that not only can adopt the mode of software programming but also can adopt software and hardware combining, Check processing strong adaptability, can reach the detection of wide-band communication is scanned by the unknown signaling of variant frequency range being converted to the mode of fixed intermediate frequency.
2. the QPSK-DS communication check method based on delay multiplication, its feature is as follows:
Step 1, system initialization also launch the scanning to target frequency bands, and the signal that radio-frequency front-end is entered to system carries out method;
Adopt the methods such as difference frequency that radiofrequency signal is gone to and determines intermediate frequency and amplify;
Step 2, analog-to-digital conversion obtain digitized signal;
Step 3, enforcement delay multiplication calculation process;
Step 4, enforcement digital low-pass filtering are processed, and obtain low-pass signal;
Step 5, use fft algorithm are tried to achieve the frequency spectrum of low-pass signal;
Step 6, search frequency domain peak value (discrete spectral line), if there is no discovery/not obvious peak value (discrete spectral line), go to step 1), if find/exist obvious peak value (discrete spectral line), enter next step;
Step 7, enforcement, to estimating the estimation of spreading rate, are carried out following work simultaneously:
A) low-pass signal of step 5) gained is done to auto-correlation computation, the peak value of Search Results sequence, realizes the estimation for unknown QPSK-DS signal of communication symbol period by the interval of adjacent peak value then;
B) signal of step 4) processing gained is done to high-pass filtering and process (filtering low frequency composition, acquisition is for estimating the useful high frequency composition of carrier frequency), then do square operation and FFT transform analysis, and the final estimation to carrier frequency by the realization of search discrete spectral line/spectrum peak;
Step 8, QPSK-DS communication check are finished dealing with,, receiver can proceed to conventional signal of communication reception and the demodulation reduction of information.
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| CN105871413A (en) * | 2016-06-13 | 2016-08-17 | 哈尔滨工业大学 | Low SNR direct sequence spread spectrum signal detection method |
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| CN101388687A (en) * | 2008-03-11 | 2009-03-18 | 电子科技大学 | Chip implementing fast high-efficient non-cooperative signal-noise ratio direct spreading signal detection method |
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Patent Citations (5)
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| US6898176B1 (en) * | 1997-11-14 | 2005-05-24 | The University Court Of The University Of Edinburgh | Communications terminal and operating method |
| US20040013174A1 (en) * | 2002-04-24 | 2004-01-22 | Jukka Nuutinen | Interference cancellation in receiver of radio system |
| CN101388687A (en) * | 2008-03-11 | 2009-03-18 | 电子科技大学 | Chip implementing fast high-efficient non-cooperative signal-noise ratio direct spreading signal detection method |
| CN102075472A (en) * | 2011-02-16 | 2011-05-25 | 四川九洲电器集团有限责任公司 | Method for spreading intermediate frequency of OQPSK and despreading and demodulating spread intermediate frequency |
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Cited By (2)
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