CN105847205A - Square wave differential phase shift keying modulation-demodulation method based on gradient - Google Patents
Square wave differential phase shift keying modulation-demodulation method based on gradient Download PDFInfo
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- CN105847205A CN105847205A CN201610160925.1A CN201610160925A CN105847205A CN 105847205 A CN105847205 A CN 105847205A CN 201610160925 A CN201610160925 A CN 201610160925A CN 105847205 A CN105847205 A CN 105847205A
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- gradient
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- square wave
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention relates to a square wave differential phase shift keying modulation-demodulation (DPSK) communication method based on a gradient in a resistance metal wired channel. The capacitance and inductance of a super long metal wire enable the resistance of the long metal wire to be not simple, cause narrowing of the bandwidth of the channel, and increase the time constant of the step response, and thus the traditional square wave DPSK communication based on an amplitude cannot work normally. The square wave differential phase shift keying modulation-demodulation method improves the demodulation algorithm by introducing the wave shape gradient at the DPSK communication reception terminal and realizes the square wave DPSK communication when a time constant is large.
Description
Technical field
The present invention relates to a kind of square wave differential phase modulation modulation-demo-demodulation method based on gradient, be applied to resistance gold
Belong to the data transmission in wire message way.
Background technology
Square wave differential phase modulation modulation /demodulation is owing to modulation-demo-demodulation method is simple, transmission is reliable, at the wired letter of metal
It is used widely in road.The method by transmission modulates information in the change of level, therefore it is required that code element width
Degree can not be less than the time constant of metal wire message way.Along with conductor length, the increase of curling and sectional area
Reducing, the electric capacity of wire and inductance increase, and channel time constant increases therewith, seriously limits square wave differential
The transfer rate of phase modulation modulation /demodulation.
Summary of the invention
The technical problem to be solved in the present invention is: conventional square wave differential phase modulation demodulation method is steady to receive waveform
State value is foundation, therefore it is required that symbol width is not less than channel time constant, each symbol waveform reaches stable state
Could correctly demodulate, seriously limit transfer rate；The present invention provides a kind of square wave differential based on gradient to adjust
Phase modulation-demo-demodulation method, in dependence reception waveform code element, the gradient of transient process realizes demodulation, can break through letter
The restriction to Baud Length of the road time constant, reduces Baud Length thus effectively improves transfer rate.
The technical solution adopted for the present invention to solve the technical problems is: a kind of square wave differential based on gradient is adjusted
Phase modulation-demo-demodulation method, comprises the following steps:
Modulation uses procedure below: (set symbol width as T, mourn in silence level state V-, excites level state V+)
(1) synchronize: waveform is converted to excite level state by level state of mourning in silence, and keeps a code element width
Degree；Then waveform is by exciting level state to be converted to level state of mourning in silence, and keeps a symbol width；Table
Show that information transmission starts.
(2) modulation: each code element modulation 1bit information；Level state changes compared with a upper code element
Represent 1 (or 0), level state invariant representation 0 (or 1).
Demodulation is adopted: use procedure below
(1) synchronize: set magnitude threshold, detect that wave-shape amplitude increases above thresholding and reduces below successively
Threshold value, then data transmission starts；And it is synchronization point that wave-shape amplitude surmounts the thresholding moment, synchronization point
Rear 2T starts as data；
(2) average gradient of waveform in each symbol interval is calculated successively.
(3) for first code element, if average gradient is just, then data are 1 (or 0)；If it is average
Gradient is 0, then data are 0 (or 1)；
(4) from the beginning of second code element, according to following table rule according to current symbol average gradient and previous code element
Average gradient demodulates.
The invention has the beneficial effects as follows, the present invention provides a kind of square wave differential phase modulation modulation /demodulation based on gradient
Method, in dependence reception waveform code element, the gradient of transient process realizes demodulation, can break through channel time constant
Restriction to Baud Length, reduces Baud Length, thus has in the plain conductor channel that capacitor and inductor is bigger
Effect improves message transmission rate.
Accompanying drawing explanation
The present invention is further described with example below in conjunction with the accompanying drawings.
Fig. 1 is an example of modulation.
Fig. 2 is an example of demodulation.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification,
The basic structure of the present invention is described the most in a schematic way, and therefore it only shows the composition relevant with the present invention.
In Fig. 1, if symbol width is T, mourn in silence level state V-, excites level state V+, every frame to comprise
8bit information；During modulation, level state changes expression 1 compared with a upper code element, and level state is constant
Represent 0；In this example, the information of this frame modulation is 11010011B.
The reception waveform that Fig. 2 is transmitted waveform in Fig. 1 after the channel that time constant is 4T.If
Determining thresholding, receive waveform reaching moment of thresholding first is synchronization point.[2T, the 3T] time after synchronization point
Be the waveform of code element 1 in Jian Ge, calculate its gradient for+, therefore first information is 1；After synchronization point [3T,
4T] be the waveform of code element 2 in time interval, calculate its gradient be-, therefore second information 1；By that analogy,
When completing the detection of code element 8, the demodulation of these frame data terminates.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, related work
Personnel can carry out various change and amendment completely in the range of without departing from this invention technological thought.
The content that the technical scope of this invention is not limited in description, it is necessary to according to right
Determine its technical scope.
Claims (3)
1. a square wave differential phase modulation modulation-demo-demodulation method based on gradient, it is characterised in that:
Modulation employing procedure below:
(1) synchronize: waveform is converted to excite level state by level state of mourning in silence, and keeps a code element width
Degree；Then waveform is by exciting level state to be converted to level state of mourning in silence, and keeps a symbol width；Table
Show that information transmission starts.
(2) modulation: each code element modulation 1bit information；Level state changes compared with a upper code element
Represent 1 (or 0), level state invariant representation 0 (or 1).
Demodulation employing procedure below:
(3) synchronize: set magnitude threshold, detect that wave-shape amplitude increases above thresholding and reduces below successively
Threshold value, then data transmission starts；And it is synchronization point that wave-shape amplitude surmounts the thresholding moment, synchronization point
Latter two code element start for transmission data；
(4) average gradient of waveform in each symbol interval is calculated successively.Waveform in each symbol interval
X [n], n ∈ [1, N], average gradient computational methods include following several:
The first 2 absolute slope (x [N]-x [1])/N of (a) code element or Relative slope (x [N]-x [1]).
(b) calculate in code element a little with wherein any point absolute slope or the meansigma methods of Relative slope, i.e.Or
(5) for first code element, if average gradient is just, then data are 1；If average gradient is
0, then data are 0；
(6) from the beginning of second code element,
2. square wave differential phase modulation modulation-demo-demodulation method based on gradient as claimed in claim 1, its feature exists
In: in step (2), 1 and 0 represents the two states of 1bit information.
3. square wave differential phase modulation modulation-demo-demodulation method based on gradient as claimed in claim 1, its feature exists
In: in step (5) and (6), average gradient is that 0 finger slope is interior at [-σ, σ], and wherein σ is signal sampling
Time analog to digital conversion precision.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610160925.1A CN105847205A (en) | 2016-03-21 | 2016-03-21 | Square wave differential phase shift keying modulation-demodulation method based on gradient |
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| CN201610160925.1A CN105847205A (en) | 2016-03-21 | 2016-03-21 | Square wave differential phase shift keying modulation-demodulation method based on gradient |
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| CN201610160925.1A Pending CN105847205A (en) | 2016-03-21 | 2016-03-21 | Square wave differential phase shift keying modulation-demodulation method based on gradient |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789787A (en) * | 2016-12-14 | 2017-05-31 | 南京理工大学 | A kind of PCM/DPSK/FM modulation /demodulation module and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1447127A (en) * | 2002-03-21 | 2003-10-08 | 深圳安科高技术股份有限公司 | Gradient preemphasis circuit |
| JP2006191278A (en) * | 2005-01-05 | 2006-07-20 | Sony Corp | Gain control modulating/demodulating circuit and communication device using the same |
| US20070002986A1 (en) * | 2005-06-30 | 2007-01-04 | Nokia Corporation | Method and apparatus for generating M-ary CPM waveforms from a superposition of PAM waveforms |
| CN103474311A (en) * | 2013-09-12 | 2013-12-25 | 中国科学院工程热物理研究所 | Plasma flow visualization device based on glow discharge principle |
| CN105281714A (en) * | 2015-11-10 | 2016-01-27 | 华东师范大学 | Square wave generating device and method capable of editing code element |
-
2016
- 2016-03-21 CN CN201610160925.1A patent/CN105847205A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1447127A (en) * | 2002-03-21 | 2003-10-08 | 深圳安科高技术股份有限公司 | Gradient preemphasis circuit |
| JP2006191278A (en) * | 2005-01-05 | 2006-07-20 | Sony Corp | Gain control modulating/demodulating circuit and communication device using the same |
| US20070002986A1 (en) * | 2005-06-30 | 2007-01-04 | Nokia Corporation | Method and apparatus for generating M-ary CPM waveforms from a superposition of PAM waveforms |
| CN103474311A (en) * | 2013-09-12 | 2013-12-25 | 中国科学院工程热物理研究所 | Plasma flow visualization device based on glow discharge principle |
| CN105281714A (en) * | 2015-11-10 | 2016-01-27 | 华东师范大学 | Square wave generating device and method capable of editing code element |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789787A (en) * | 2016-12-14 | 2017-05-31 | 南京理工大学 | A kind of PCM/DPSK/FM modulation /demodulation module and method |
| CN106789787B (en) * | 2016-12-14 | 2019-08-30 | 南京理工大学 | A kind of PCM/DPSK/FM modulation /demodulation module and method |
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Application publication date: 20160810 |