CN101321015B - Full-digitalization pulse position modulation signal receiver and receiving method - Google Patents
Full-digitalization pulse position modulation signal receiver and receiving method Download PDFInfo
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Abstract
A fully digital pulse position modulation signal receiver comprises a high speed data acquisition card and a computer, wherein the high speed data acquisition card is directed mounted on the slot of the computer mainboard working in the direct memory access mode. The high speed data acquisition card digitalizes the received signal, and the processing and the demodulating functions of the all signals are completed by the software of the computer. The CPU performs the matching filter, the related detection and the demodulating device on the input digital signal and finally real-time displays onthe display of the computer. According to the invention, the receiver solves the difficulty of the pulse position modulation signal under different applications, the background noise and the pulse position modulation signal with pulse distortion, wherein the receiver has the characteristics of high integrity, high sensitivity, strong noise concelling ability, low error rate, good flexibility and operability, applied in the reception of the weak pulse position modulation signal in the free space laser communication.
Description
Technical field
The present invention relates to pulse position modulation signal receiver, particularly a kind of based on high-speed data acquisition card and computer implemented totally digitilized pulse position modulation signal receiver and method of reseptance, can carry out correct demodulation to the faint pulse position modulation signal that is mingled under the background noise situation that receives in the different application occasion, and demodulation result is shown and storage in real time.
Background technology
Continuous development along with the pulse laser technology, laser more and more widely is applied to the free space laser communication field, usually free space laser communication adopts the pulse position modulation mode, the positional information that occurs by laser pulse transmits useful signal, complicated along with the increase of laser transmission distance and application scenario meanwhile, the pulse distortion that transmission channel caused is also more and more serious with decay, the distortion of pulse and the reduction of signal to noise ratio will have a strong impact on the correct demodulation of received signal, thereby more and more higher requirement has been proposed receiver, traditional communicating requirement that has been difficult to satisfy various occasions based on the receiver of pure hardware, based on the amplitude and the pulse duration uncertainty of when communication received signal, more requirement has been proposed for the reception of the faint pulse position modulation signal of distortion:
1. adopt Digital Signal Processing, the requirement that reduces signal to noise ratio to received signal is to satisfy the high sensitivity demand;
2. can from stronger background noise environment, extract signal in different application scenarios, can also resist certain burst noise simultaneously;
3. can from the signal of the broadening that receives and distortion, recover pulse signal exactly and extract pulse position, and the pulse signal that extracts is carried out correct demodulation, satisfy the requirement of communication bit error rate performance;
4. can real-time continuous work, visual good, operate and be provided with conveniently, install integrated degree height, working stability is reliable.
It is that the analog circuit of core is realized that existing receiver is based on single-chip microcomputer and comparator more, usually be referred to as hard receiver, generally compare by the comparator thresholding that the signal that receives and hardware setting is good, if surpass then output pulse signal send single-chip microcomputer to handle, single-chip microcomputer obtains the time interval of adjacent pulse signal and carries out demodulation based on this time interval by sheet inside counting device, this hard receiver threshold can't be according to the application scenario automatic setting, simultaneously because comparatively serious broadening and distortion may take place in pulse, can cause pulse position bigger deviation to occur, can't regulate according to the pulse width adaptation that receives, very flexible, the error rate worsens, and is difficult to satisfy particular demands.
Summary of the invention
The problem to be solved in the present invention is to overcome the difficult problem that the hard receiver of above-mentioned tradition run into and satisfies above-mentioned requirements in the middle of free space laser communication is used, a kind of totally digitilized pulse position modulation signal receiver and method of reseptance are provided, this receiver can solve in the different application occasion, the difficult problem that pulse position modulation signal under background noise and the pulse distortion receives, this receiver has the integrated level height, highly sensitive, anti-noise ability is strong, the error rate is low, simple in structure, the characteristics that flexibility and operability are good can be used for the reception of faint pulse position modulation light signal in the free space laser communication.
Technical solution of the present invention is as follows:
A kind of pulse position modulation signal receiver of total digitalization, comprise high-speed data acquisition card and computer, its characteristics are that described high-speed data acquisition card is directly installed in the slot of this computer motherboard, be operated in direct memory access mode, it is signal digitalized that described high-speed data acquisition card will receive, and all Signal Processing and demodulation function are all finished by the software of computer, this software is divided into man-machine interaction unit by logic function, the matched filtering unit, the coherent detection unit, demodulating and decoding unit and data-storing and display unit, this central processing unit (CPU) passes through matched filtering successively to the digital signal of sending into, coherent detection, demodulating and decoding shows on computer display screen at last in real time.
The method of reseptance of above-mentioned totally digitilized pulse position modulation signal receiver comprises the steps:
1. high-speed data acquisition: open this receiver, set every running parameter by the man-machine interaction working interface: pulse width T, likelihood decision threshold N ', the pulse position modulation signal that decay and distortion take place after long Distance Transmission that described high-speed data acquisition card will receive is converted to digital signal, send the storage of computer-internal memory space;
2. pulse position information extraction: the digitized pulse position modulation signal of self adaptation pulsewidth matched filtering unit to receiving of computer, add up to the received signal in default a certain pulse width T according to self adaptation pulsewidth matched filtering unit, and with accumulation result N and initial likelihood decision threshold N ' comparison, if N is greater than N ', then think it to be useful signal pulse, and send the internal register storage this pulse position information;
3. frame head detects: when the pulse number that receives reaches the contained pulse number of known frame head, starting frame head detects, computer coherent detection unit carries out correlation computations one by one with contained pulse position interval information of known frame head and the pulse spacing positional information that receives, when the contained pulse position interval information coupling of the positional information of the pulse that receives and known frame head, promptly think and received frame head, confirm that the signal of being received is a useful signal, and add up the width information T ' of pulse in this frame head, add up the interior signal of this coupling pulsewidth T ' simultaneously, likelihood decision threshold N ' as the follow-up signal pulse detection, regulate the optimum Match pulsewidth T ' of described self adaptation pulsewidth matched filtering unit and the likelihood decision threshold N ' of coherent detection unit adaptively according to this frame head, and according to maximum-likelihood criterion, successively follow-up input signal is carried out matched filtering of self adaptation pulsewidth and Maximum Likelihood Detection signal processing
4. demodulating and decoding: the demodulating and decoding unit starts after the coherent detection unit detects frame head immediately, according to the detected pulse position information in matched filtering unit, 2. the pulse position modulation mode that is adopted when utilizing the signal modulating-coding goes on foot the detected pulse position information in matched filtering unit to the and carries out real-time demodulation, and the coded system that is adopted based on coding after demodulation is decoded;
5. repeat above-mentioned the 1.～4. step, dispose up to all pulse position modulation signals of this information, final decoded results is stored in the computer and send computer screen to show, finishes the reception of described pulse position modulation signal.
The invention has the advantages that:
The present invention adopts high-speed data acquisition card and computer realization, can real-time continuous work, and man-machine interaction is good, operates and is provided with conveniently, installs integrated degree height, and working stability is reliable;
The present invention adopts Digital Signal Processing, has reduced the requirement of signal to noise ratio to received signal, can satisfy the high sensitivity demand;
The present invention has adopted adaptive matched filter and correlation detection technology, can according to background noise levels likelihood decision threshold and coupling pulsewidth be set adaptively in the different application occasion, can from the signal of the broadening that receives and distortion, recover and extract pulse position accurately, the pulse signal that extracts is carried out correct demodulation, anti-burst noise ability is strong, satisfies the requirement of communication bit error rate performance;
The invention solves the reception difficult problem of faint pulse position modulation distorted signal under the situation of different application occasion, background noise and pulse distortion, satisfy high sensitivity and low bit error performance requirement, can be widely used in the free space laser communication, have broad application prospects, can promote the continuous practicality of correlation technique, have good market prospects.
Description of drawings
Fig. 1 is the present invention's total digitalization pulse position modulation signal receiver overall structure schematic diagram, and wherein the internal logic functional unit of realizing for computer programming in the frame of broken lines is divided schematic diagram;
Fig. 2 is matched filtering cell operation schematic diagram in the present invention's total digitalization pulse position modulation signal receiver;
Fig. 3 is coherent detection cell operation schematic diagram in the present invention's total digitalization pulse position modulation signal receiver;
Fig. 4 is the software flow pattern of the present invention's total digitalization pulse position modulation signal receiver.
Among the figure: 1-high-speed data acquisition card, 2-computer, 21-man-machine interaction unit, 22-matched filtering unit, 23-coherent detection unit, 24-demodulating and decoding unit, 25-storage and display unit.
Embodiment
Apparatus of the present invention are embodiment with the free space laser communication under certain occasion, adopt 8 system pulse position modulation modes, RS coded system, and the signal pulse width that its expectation receives is 500ns, signal strength signal intensity 1nw, and the error rate requires to be better than P
e＜=10
-5The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
At first please refer to Fig. 1, Fig. 1 is for the present invention is based on totally digitilized pulse position modulation signal receiver overall structure schematic diagram, and wherein the internal logic functional unit of realizing for computer programming in the frame of broken lines is divided schematic diagram.As seen from Figure 1, the present invention's total digitalization pulse position modulation signal receiver is made up of high-speed data acquisition card 1 and computer 2, and all signal processing are conciliate and reconciled code function by computer programming, software realization.According to realizing that functional machine inside can be divided into again: man-machine interaction unit 21, matched filtering unit 22, coherent detection unit 23, demodulating and decoding unit 24 and data-storing and display unit 25.Its position and annexation are: high-speed data acquisition card 1 is connected with computer 2 by pci interface, be directly installed in the PCI slot on the computer motherboard, be operated in dma mode, directly send the computer-internal memory space with the data that collect, computer 2 is handled the digital signal that receives after setting running parameter by man-machine interaction unit 21, pass through matched filtering unit 22, coherent detection unit 23, demodulating and decoding unit 24 and data-storing and display unit 25 successively, show in real time by computer display screen at last.
Next please refer to Fig. 2, and Fig. 2 is mainly used in the middle of the signal that receives and extracts pulse signal for matched filtering unit 22 operation principle schematic diagrames in the present invention's total digitalization pulse position modulation signal receiver.As seen from Figure 2, input traffic is successively through a sliding window, the likelihood function computing module is compared with a thresholding behind the data in the window and the sliding window convolution of functions, if exceed then think pulse signal, and locate the start-stop information and the amplitude information of this pulse, send the internal register storage simultaneously.Sliding window size in the middle of this matched filtering unit 22 and thresholding will be after detecting the frame synchronization head real-time feedback modifiers, play the effect of adaptive matched filter.
Next please refer to Fig. 3, Fig. 3 is coherent detection unit 23 operation principle schematic diagrames in the present invention's total digitalization pulse position modulation signal receiver.As shown in Figure 3, coherent detection unit 23 will be by matched filtering unit 22 detected pulse data streams successively through a data buffer, and make related operation with the given frame synchronous head synchronizing sequence of having stored, after obtaining maximum related value and exceeding comparison threshold, promptly think to have detected the frame synchronization head, and provide synchronizing signal accurately.
Please refer to Fig. 4 at last, Fig. 4 is the present invention's total digitalization pulse position modulation signal receiver program flow diagram.As shown in Figure 4, by computer software layout setting good berth parameter and with the internal data zero clearing after, this receiver begins reception work.High-speed data acquisition card 1 advances computer 2 internal memories with the data flow collection that receives, the digital signal of 2 pairs of inputs of computer is handled in real time, at first extract pulse signal by matched filtering unit 22, detect the frame synchronization head by coherent detection unit 23 subsequently, in case detect width and strength information and the self adaptation adjustment matched filtering relevant parameter of frame synchronization head with the pulse of statistics frame synchronous head, meanwhile start 23 pairs of follow-up signal demodulation of demodulation code element sign indicating number, at last with the signal real-time storage and the demonstration that decode.
The concrete device that present embodiment adopts is: the sampling rate of described high-speed data acquisition card 1 is 10Mbps, band DMA and first-in first-out (FIFO) function, and described computer 2 is P4 2.4G, the common desktop computer of 1G internal memory.
In conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the detailed process that the totally digitilized pulse position modulation signal receiver of present embodiment receives faint pulse position modulation signal is:
1. parameter setting: at first move computer 2 and start the receiver application program, enter the interface is set, by this human-computer interaction interface 21 the every running parameter of computer is set, as high-speed data acquisition card A/D speed is set is that 10Mbps, initial pulsewidth are that 500ns, pulse position modulation parameter are that the contained information pulse number of 8PPM, every frame is that 128, coded system are the RS error correcting code and select data to preserve the position, and are data processing distribution internal storage space;
2. data acquisition: start high-speed data acquisition card 1, high-speed data acquisition card 1 is converted into the small-signal that receives digital signal and send computer 2 internal storage spaces by dma mode with 10Mbps speed;
3. DISCHARGE PULSES EXTRACTION: computer-internal matched filtering unit 22 is according to maximum-likelihood criterion, with input traffic successively through a sliding window (the home window width is 500ns), the likelihood function computing module is compared with a thresholding behind the data in the window and the sliding window convolution of functions, and this thresholding initial value is based on desired bit error rate performance
Obtain Q 〉=4, so decision threshold is taken as 4 times of background noise, promptly
Wherein
For receiving noise signal statistical average in the 500ns when the in stable condition back of operation of receiver, the no signal, the signal to noise ratio (snr) that is equivalent to received signal requires to be SNR 〉=4, with respect to traditional Photoelectric Detection, for the requirement of SNR 〉=16 under the requirement of same bit error rate performance, reduce requirement to received signal, promptly improved receiving sensitivity and receptivity.
If relatively back sliding window convolution results exceeds thresholding, then think pulse signal, and locate the start-stop information and the amplitude information of this pulse, send the internal register storage to handle simultaneously for subsequent analysis.Sliding window size in the middle of this matched filtering unit 22 and thresholding will be after detecting the frame synchronization head real-time feedback modifiers play the actual effect of adaptive matched filter.Adopt the reason of matched filtering to be in the linear filters all under white noise environment, the signal to noise ratio maximum of matched filter output.Noise will can not obtain relevant the enhancing owing to uncorrelated mutually, thereby the peak-peak signal to noise ratio of matched filter output will help accurately extracting pulse and find pulse position more than the signal to noise ratio height of original input.
4. the frame synchronization head detects: coherent detection unit 23 will be by matched filtering unit 22 detected pulse data streams successively through a data buffer, the length of this data buffer is consistent with a known frame synchronization pulse number, and make related operation with the given frame synchronous head sequence of having stored, after obtaining maximum related value and exceeding comparison threshold, promptly think and detected the frame synchronization head, and provide synchronizing signal accurately, this synchronizing signal will be used for follow-up demodulates information accurately, obtaining synchronous back according to frame synchronization header feedback modifiers matched filtering thresholding and sliding window width, automatically revise a frame synchronization pulse pulsewidth T ' of coupling pulsewidth T for confirming of subsequent frame signal based on the width information of pulse in this frame synchronization head of statistics, add up simultaneously that the interior signal of this frame synchronization head coupling pulsewidth T ' adds up and foundation is set as the likelihood decision threshold of follow-up signal pulse detection, guarantee the accurate coupling of pulse signals, and according to maximum-likelihood criterion, successively follow-up input signal is carried out matched filtering of self adaptation pulsewidth and Maximum Likelihood Detection signal processing, receive up to a frame information, repeat said process when detecting next frame synchronization.
5. demodulating and decoding: after detecting the frame synchronization head, start demodulating and decoding work immediately, demodulating and decoding unit 24 carries out real-time demodulation according to the pulse position modulation mode 8PPM that is adopted to the aforementioned pulse position information of accurately extracting, contained 128 information pulses of every frame are demodulated, after demodulation, carry out the correspondence decoding again based on the RS coded system that is adopted.
6. storage and demonstration: storage and display unit 25 store the demodulating and decoding result into hard disc of computer, send computer screen to show simultaneously, finish the reception of pulse position modulation signal.
Claims (2)
1. the pulse position modulation signal receiver of a total digitalization, comprise high-speed data acquisition card (1) and computer (2), it is characterized in that described high-speed data acquisition card (1) is directly installed in the slot of this computer (2) mainboard, be operated in direct memory access mode, it is signal digitalized that described high-speed data acquisition card (1) will receive, and all Signal Processing and demodulation function are all finished by the software of computer (2), this software is divided into man-machine interaction unit (21) by logic function, matched filtering unit (22), coherent detection unit (23), demodulating and decoding unit (24) and data-storing and display unit (25), the every running parameter of described man-machine interaction unit (21) configuring receiver starts the operation of receiver flow process; The statistical average of the noise that matched filtering unit (22) receives based on precalculated pulsewidth with when the no signal is carried out matched filtering to input signal, regulate according to the signal pulsewidth self adaptation that receives again and be set to the optimum Match pulsewidth, from background noise, extract faint pulsed optical signals accurately, for follow-up extraction of frame synchronization head and demodulating and decoding work provide pulse position information accurately; Coherent detection unit (23) carries out correlation computations one by one with contained pulse position interval information of known frame head and the pulse spacing positional information that receives, and detects a frame synchronization signal from received signal stream, guarantees synchronously accurately; Demodulating and decoding unit (24) is based on pulse position information that has extracted and frame synchronization header, demodulating and decoding goes out useful information accurately, this computer (2) central processing unit passes through matched filtering, coherent detection, demodulating and decoding successively to the digital signal of sending into, and shows in real time on computer display screen at last.
2. the method for reseptance of the described totally digitilized pulse position modulation signal receiver of claim 1 is characterized in that comprising the steps:
1. high-speed data acquisition: open this receiver, set every running parameter by man-machine interaction working interface (21): pulse width T, likelihood decision threshold N ', the pulse position modulation signal that decay and distortion take place after long Distance Transmission that described high-speed data acquisition card (1) will receive is converted to digital signal, send the storage of computer (2) internal storage space;
2. pulse position information extraction: the digitized pulse position modulation signal of self adaptation pulsewidth matched filtering unit (22) to receiving of computer, add up to the received signal in default a certain pulse width T according to self adaptation pulsewidth matched filtering unit (22), and with accumulation result N and initial likelihood decision threshold N ' comparison, if N is greater than N ', then think it to be useful signal pulse, and send the internal register storage this pulse position information;
3. frame head detects: when the pulse number that receives reaches the contained pulse number of known frame head, starting frame head detects, computer coherent detection unit (23) carries out correlation computations one by one with contained pulse position interval information of known frame head and the pulse spacing positional information that receives, when the contained pulse position interval information coupling of the positional information of the pulse that receives and known frame head, promptly think and received frame head, confirm that the signal of being received is a useful signal, and add up the width information T ' of pulse in this frame head, add up the interior signal of this coupling pulsewidth T ' simultaneously, likelihood decision threshold N ' as the follow-up signal pulse detection, regulate the optimum Match pulsewidth T ' of described self adaptation pulsewidth matched filtering unit (22) and the likelihood decision threshold N ' of coherent detection unit (23) adaptively according to this frame head, and according to maximum-likelihood criterion, successively follow-up input signal is carried out matched filtering of self adaptation pulsewidth and Maximum Likelihood Detection signal processing
4. demodulating and decoding: demodulating and decoding unit (24) start after coherent detection unit (23) detect frame head immediately, according to the detected pulse position information in matched filtering unit, 2. the pulse position modulation mode that is adopted when utilizing the signal modulating-coding goes on foot the detected pulse position information in matched filtering unit to the and carries out real-time demodulation, and the coded system that is adopted based on coding after demodulation is decoded;
5. repeat above-mentioned the 1.～4. step, dispose up to all pulse position modulation signals of this information, final decoded results is stored in the computer and send computer screen to show, finishes the reception of described pulse position modulation signal.
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| CN102255632B (en) * | 2011-07-19 | 2013-09-18 | 桂林电子科技大学 | Adaptive pulse position modulation signal demodulation method |
| CN103888108B (en) * | 2014-03-21 | 2018-04-13 | 天地融科技股份有限公司 | A kind of data decoding method and device |
| CN107359959B (en) * | 2016-05-09 | 2019-12-24 | 上海复旦微电子集团股份有限公司 | Method for detecting initial position of data frame and receiver |
| CN106027151B (en) * | 2016-05-11 | 2018-09-14 | 中天宽带技术有限公司 | A kind of regulated and controled with spectrum segmentation incoherent light source and adaptive threshold based on ultra-narrow communication device in WDM-PON systems |
| CN106160865B (en) * | 2016-06-17 | 2018-11-23 | 北京邮电大学 | Modulation, demodulation method and the device of signal |
| CN108768517B (en) * | 2018-04-19 | 2020-03-10 | 华南师范大学 | PPM-based sending end, receiving end and visible light communication system |
| CN113098809B (en) * | 2021-04-14 | 2023-10-10 | 中电海康无锡科技有限公司 | Software self-adaptive decoding method, device and wireless charging system |
| CN113176451B (en) * | 2021-04-22 | 2023-08-15 | 浙江威星智能仪表股份有限公司 | Pulse signal detection method based on table look-up method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793326A (en) * | 1996-01-11 | 1998-08-11 | Daimler-Benz Aerospace Ag | Methods of generating a clutter threshold and arrangements for executing the methods |
| CN1298206A (en) * | 1999-11-25 | 2001-06-06 | 深圳市华为技术有限公司 | Multiple choise coherent detection method |
| CN2750383Y (en) * | 2004-09-30 | 2006-01-04 | 秦树人 | Virtual dynamic signal analyzer |
| EP1919209A1 (en) * | 2006-10-31 | 2008-05-07 | Sony Deutschland Gmbh | Method and device for fast and effective noise reduction |
| CN101201317A (en) * | 2007-10-16 | 2008-06-18 | 天津大学 | Multicenter parallel measuring system for light ball modulation type reflection difference spectrograph |
-
2008
- 2008-06-20 CN CN2008100392943A patent/CN101321015B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793326A (en) * | 1996-01-11 | 1998-08-11 | Daimler-Benz Aerospace Ag | Methods of generating a clutter threshold and arrangements for executing the methods |
| CN1298206A (en) * | 1999-11-25 | 2001-06-06 | 深圳市华为技术有限公司 | Multiple choise coherent detection method |
| CN2750383Y (en) * | 2004-09-30 | 2006-01-04 | 秦树人 | Virtual dynamic signal analyzer |
| EP1919209A1 (en) * | 2006-10-31 | 2008-05-07 | Sony Deutschland Gmbh | Method and device for fast and effective noise reduction |
| CN101201317A (en) * | 2007-10-16 | 2008-06-18 | 天津大学 | Multicenter parallel measuring system for light ball modulation type reflection difference spectrograph |
Non-Patent Citations (1)
| Title |
|---|
| 吴玉成，陈婷婷.在滑动窗口中判决的自适应门限检测方法.《系统仿真学报》.2008,第20卷(第10期),2770-2773. * |
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