CN106130944A - Pulse-modulated signal receiving processing system and method - Google Patents
Pulse-modulated signal receiving processing system and method Download PDFInfo
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- CN106130944A CN106130944A CN201610562187.3A CN201610562187A CN106130944A CN 106130944 A CN106130944 A CN 106130944A CN 201610562187 A CN201610562187 A CN 201610562187A CN 106130944 A CN106130944 A CN 106130944A
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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
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/005—Transmission systems in which the medium consists of the human body
Abstract
The invention discloses a kind of pulse-modulated signal receiving processing system and method, described system includes automatic gain control amplifier, squarer, low pass filter, fixed pulse width decision device, trigger-type analog-digital converter and difference phase demodulation device；The input input pulse formula 2DPSK modulated signal of automatic gain control amplifier, automatic gain control amplifier outfan connects input and the signal input part of trigger-type analog-digital converter of squarer, the outfan of squarer connects the input of low pass filter, the outfan of low pass filter connects the input of fixed pulse width decision device, the outfan of fixed pulse width decision device connects the synchronization of trigger-type analog-digital converter and triggers input, and the outfan of trigger-type analog-digital converter connects the input of difference phase demodulation device.The present invention directly carries out carrier auxiliary output base band absolute code data, have low-power consumption, low complex degree, at a high speed, feature easy of integration, meet human body medium and transmit the demand of application.
Description
Technical field
The present invention relates to human body medium's communication technical field, particularly relate to a kind of pulse-modulated signal receiving processing system
And method.
Background technology
Along with electronic information technology, wireless communication technology, semiconductor integrated circuit technology, the swift and violent of bio-medical technology are sent out
Open up, and wireless application demand is improved constantly by people, body area network (BAN, the BodyArea with human body as medium
Network) communication system because it is portable, low-power consumption, the feature of low complex degree, it is possible to be well adapted for medical treatment, space flight, physical culture with
And the demand that human body physical sign is measured and monitored by the field such as military affairs in real time, it is increasingly becoming next generation mobile communication technology and has ground
One of focus direction in studying carefully.
Compared with traditional wireless communication means, the advantage of human body medium's communication is to accomplish nearly full-automation, Ke Yilian
Continuous or be periodically detected and motility is strong, highly reliable and precision is high, and (the body area network sensor being attached to human body can be effective and high
The process human body physical signalling of precision), efficiency is high (low-power consumption lower node length in service life), low cost, low-power consumption, high security
And the advantage such as low human body infringement, and there is not the problem that many people communication efficiency rate reduces.Therefore, research is with human body self
Communication system as transmission medium has become the urgent needs of industry.
At present, the modulation and demodulation technical elements of signal is studied rank also in starting in the human body medium communications field by industry
Section, is around what human body channel, data access, networking and signal processing algorithm aspect were carried out more, and only minority team uses and divides
Vertical element has tentatively been built human body medium and has been transmitted hardware experiment, and the modulation-demodulation technique of human body medium's communication is rarely had report
Road, existing human body medium communicates with OOK (On-Off Keying, binary system on off keying), ASK (amplitude shift keying), 2FSK
Modulation-demodulation techniques such as (Binary Frequency Shift Keyings) is main.2PSK (binary phase shift keying) has preferable error code by contrast
Rate performance, but in 2PSK signal transmission system, there is phase indeterminacy, and will result in receiving symbol " 0 " and the top of " 1 "
Fall, produce error code.In order to keep 2PSK advantage, reduce the bit error rate, 2PSK modulation is improved to BDPSK binary differential phase shift keying and adjusts
System.2DPSK (binary system difference keyed phase shift keying) modulation technique has that efficiency of transmission is high, capacity of resisting disturbance strong, bit error rate
The advantages such as function admirable.But, owing to 2DPSK modulated signal not containing carrier component, it is impossible to directly carry out carrier auxiliary, because of
This existing demodulation method is all to be used with Costas loop correlation demodulation method by quadratic loop phaselocked loop correlation demodulation method
Complicated circuit recovers and modulates the coherent carrier of carrier wave stringent synchronization, virtually adds complexity and the energy of reception system
Consumption, and cause chip area and power consumption after the system integration relatively big, and need to bear higher operating frequency.
Summary of the invention
Based on above-mentioned situation, the present invention proposes a kind of pulse-modulated signal receiving processing system and method, directly carries out
Carrier auxiliary output base band absolute code data, have low-power consumption, low complex degree, at a high speed, feature easy of integration, meet human body medium
The demand of transmission application.
To achieve these goals, the embodiment of technical solution of the present invention is:
A kind of pulse-modulated signal receiving processing system, including automatic gain control amplifier, squarer, low-pass filtering
Device, fixed pulse width decision device, trigger-type analog-digital converter and difference phase demodulation device；
The input input pulse formula 2DPSK modulated signal of described automatic gain control amplifier, described automatic gain control
The outfan of amplifier processed connects input and the signal input part of described trigger-type analog-digital converter of described squarer respectively,
The outfan of described squarer connects the input of described low pass filter, and the outfan of described low pass filter connects described solid
Determining the input of pulse width decision device, the outfan of described fixed pulse width decision device connects described trigger-type analog digital conversion
The synchronization of device triggers input, and the outfan of described trigger-type analog-digital converter connects the input of described difference phase demodulation device
End.
A kind of pulse-modulated signal receiving handling method, comprises the following steps:
Pulsed 2DPSK modulated signal is carried out automatic growth control amplification, it is thus achieved that amplitude envelops stabilization signal, by described
Amplitude envelops stabilization signal divides two-way to export；
First via amplitude envelops stabilization signal is carried out square operation；
Extract the envelope signal in the first via amplitude envelops stabilization signal after carrying out square operation；
Described envelope signal is made decisions, according to predetermined pulse width, the envelope signal after making decisions is carried out pulse
Broadening, it is thus achieved that synchronous digital pulse signal, described predetermined pulse width is according to the pulse width of described amplitude envelops stabilization signal
Arrange；
Use default sample rate that the second road amplitude envelops stabilization signal is adopted according to described synchronous digital pulse signal
Sample, described default sample rate is arranged according to the carrier frequency of described amplitude envelops stabilization signal；
Adjacent two hits that before and after's double sampling obtains are carried out according to described second road amplitude envelops stabilization signal
According to, it is thus achieved that base band absolute code data.
Compared with prior art, the invention have the benefit that pulse-modulated signal receiving processing system of the present invention and side
Method, automatic gain control amplifier carries out automatic growth control amplification to pulsed 2DPSK modulated signal, it is thus achieved that amplitude envelops is steady
Determine signal；Squarer carries out square operation to first via amplitude envelops stabilization signal；Low pass filter extracts and carries out square operation
Envelope signal in rear signal；The envelope signal extracted is made decisions, according to predetermined pulse width by fixed pulse width decision device
Degree carries out pulse stretching to the envelope signal after making decisions, it is thus achieved that synchronous digital pulse signal；When synchronous digital pulse signal
During input trigger-type analog-digital converter, trigger-type analog-digital converter uses presets sample rate to the second road amplitude envelops stabilization signal
Sample；Last difference phase demodulation device carries out what before and after's double sampling obtained according to the second road amplitude envelops stabilization signal
Adjacent two sampled datas, settle recovery output base band absolute code data at one go.The present invention uses pulsed 2DPSK modulated signal
Improve the band efficiency of human body channel, improve transmission rate, system is operated in digital trigger-type state, directly carries
Ripple recovers, and can bring the per bit energy consumption of system with low-power consumption, low complex degree, advantage at a high speed in realization and significantly reduce,
And (Complementary Metal Oxide Semiconductor, CMOS (Complementary Metal Oxide Semiconductor) is partly led can to use CMOS completely
Body) integrated circuit technology realization, there is not large-area integrated resistor and electric capacity shaping circuit, be suitable for being integrated in SOC (System
On Chip, system level chip) chip, there is good promotional value.
Accompanying drawing explanation
Fig. 1 is pulse-modulated signal receiving processing system structural representation in an embodiment；
Fig. 2 is difference phase demodulation device structural representation in an embodiment；
Fig. 3 is phase comparator structural representation in an embodiment；
Fig. 4 is based on pulse-modulated signal receiving processing system structural representation in one concrete example of system shown in Figure 1；
Fig. 5 is the application example of a pulse-modulated signal receiving processing system；
Fig. 6 is pulse-modulated signal receiving handling method flow chart in an embodiment.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, to this
Invention is described in further detail.Should be appreciated that detailed description of the invention described herein only in order to explain the present invention,
Do not limit protection scope of the present invention.
Pulse-modulated signal receiving processing system in one embodiment, as it is shown in figure 1, include automatic gain control amplifier
101, squarer 102, low pass filter 103, fixed pulse width decision device 104, trigger-type analog-digital converter 105 and difference phase
Position demodulator 106；
The input input pulse formula 2DPSK modulated signal of described automatic gain control amplifier 101, described automatic gain
Control the outfan of amplifier 101 and connect the input of described squarer 102 and described trigger-type analog-digital converter 105 respectively
Signal input part, the outfan of described squarer 102 connects the input of described low pass filter 103, described low pass filter
The outfan of 103 connects the input of described fixed pulse width decision device 104, described fixed pulse width decision device 104
Outfan connects the synchronization of described trigger-type analog-digital converter 105 and triggers input, described trigger-type analog-digital converter 105 defeated
Go out end and connect the input of described difference phase demodulation device 106.
Automatic gain control amplifier 101 carries out automatic growth control amplification to pulsed 2DPSK modulated signal, exports two
Road amplitude envelops stabilization signal；After squarer 102 carries out square operation output square to first via amplitude envelops stabilization signal
Amplitude envelops stabilization signal；Low pass filter 103 extracts the envelope letter in the amplitude envelops stabilization signal after carrying out square operation
Number；Fixed pulse width decision device 104 to extract envelope signal make decisions, according to predetermined pulse width to making decisions after
Envelope signal carry out pulse stretching, it is thus achieved that synchronous digital pulse signal；When synchronous digital pulse signal arrives, trigger-type mould
Number converter 105 uses default sample rate to sample the second road amplitude envelops stabilization signal；Last difference phase demodulation device
106 according to carrying out, to the second road amplitude envelops stabilization signal, adjacent two sampled datas that before and after's double sampling obtains, and a step arrives
Bit recovery output base band absolute code data.
Trigger-type analog-digital converter is just sampled when synchronous digital pulse signal arrives, remaining time analog-digital converter
Enter holding state and do not export data.
It is evidenced from the above discussion that, pulse-modulated signal receiving processing system of the present invention, use pulsed 2DPSK modulated signal
Improve the band efficiency of human body channel, improve transmission rate, system is operated in digital trigger-type state, directly carries
Ripple recovers, and can bring the per bit energy consumption of system with low-power consumption, low complex degree, advantage at a high speed in realization and significantly reduce,
And CMOS integrated circuit technology can be used completely to realize, there is not large-area integrated resistor and electric capacity shaping circuit, be suitable for
It is integrated in SOC, there is good promotional value.
Additionally, in a concrete example, as in figure 2 it is shown, described difference phase demodulation device 106 includes the first shift LD
Device the 1061, second shift register 1062 and phase comparator 1063；
The outfan of described trigger-type analog-digital converter 105 connects described first shift register 1061, and described first moves
First outfan of bit register 1061 connects the input of described second shift register 1062, described first shift register
Second outfan of 1061 and the outfan of described second shift register 1062 connect described phase comparator 1063 respectively
Input.
Trigger-type analog-digital converter 105 output sampled data for the first time is posted to the first shift register 1061, the first displacement
Storage 1061 carries out shift LD operation to first time sampled data, obtains the first shift LD data dn(t), trigger-type modulus
Transducer 105 output second time sampled data shifts first to the first shift register 1061, the first shift register 1061
Registered data dnT () exports to the second shift register 1062, the second shift register 1062 exports the first shift LD data dn
T () arrives phase comparator 1063, the first shift register 1061 carries out shift LD operation to second time sampled data, obtains the
Two shift LD data dn+1T (), the first shift register 1061 exports the second shift LD data dn+1T () arrives phase comparator
1063, phase comparator 1063 is according to the first shift LD data dn(t) and the second shift LD data dn+1(t) output base band
Absolute code data.
Additionally, in a concrete example, as it is shown on figure 3, described phase comparator 1063 includes digital multiplying circuit
10631, average obtains circuit 10632 and threshold value decision circuit 10633；
Second outfan of described first shift register 1061 connects the first input of described digital multiplying circuit 10631
End, the outfan of described second shift register 1062 connects the second input of described digital multiplying circuit 10631, described number
The outfan of word mlultiplying circuit 10631 connects described average and obtains the input of circuit 10632, and described average obtains circuit
The outfan of 10632 connects the input of described threshold value decision circuit 10633.
Such as first shift register 1061 output signal dn(t), the second shift register 1062 output signal dn+1(t),
So digital multiplying circuit 10631 is by above-mentioned two signal multiplication, obtains circuit 10632 by average and obtains digital multiplying circuit
The direct current average of 10631 output products, threshold value decision circuit 10633 is by this direct current average and a certain mathematics threshold set in advance
Value, corresponding output " logic 1 " or " logical zero ", thus realize the demodulation of pulsed 2DPSK unrelated signal.
Additionally, in a concrete example, said system also includes low-noise amplifier, described low-noise amplifier defeated
Entering end and input described pulsed 2DPSK modulated signal, the outfan of described low-noise amplifier connects described automatic growth control
The input of amplifier.
Low-noise amplifier noise coefficient is the lowest, is amplifying the occasion of small-signal, the noise of low-noise amplifier self
Interference to signal is the least, improves the signal to noise ratio of output.
Additionally, in a concrete example, said system also includes frequency-selecting filter, the input of described frequency-selecting filter
Inputting described pulsed 2DPSK modulated signal, the outfan of described frequency-selecting filter connects the input of described low-noise amplifier
End.
Here special frequency channel in pulsed 2DPSK modulated signal can be obtained by frequency-selecting filter according to actual needs
Signal carries out follow-up study process, is suitable for application.
Additionally, in a concrete example, described fixed pulse width decision device includes decision device and fixed pulse broadening
Device；
The outfan of described low pass filter connects the input of described decision device, and the outfan of described decision device connects institute
Stating the input of fixed pulse stretcher, the outfan of described fixed pulse stretcher connects described trigger-type analog-digital converter
Synchronize to trigger input.
The signal that low pass filter is exported by decision device makes decisions, and fixed pulse stretcher can set according to actual needs
Put pulse stretching width, the signal of decision device output is carried out pulse stretching, it is ensured that subsequent treatment is normally carried out.
In order to be more fully understood that said system, a pulse-modulated signal receiving processing system of the present invention detailed below
Application example.
As shown in Figure 4, described system can include frequency-selecting filter 401, low-noise amplifier 402, automatic growth control
Amplifier 403, squarer 404, low pass filter 405, decision device 406, fixed pulse stretcher 407, trigger-type analog digital conversion
Device 408 and difference phase demodulation device 409；
The input input pulse formula 2DPSK modulated signal of frequency-selecting filter 401, the outfan of frequency-selecting filter 401 is even
Connecing the input of low-noise amplifier 402, the outfan of low-noise amplifier 402 connects automatic gain control amplifier 403
Input, the outfan of automatic gain control amplifier 403 connects input and the trigger-type analog digital conversion of squarer 404 respectively
The signal input part of device 408, the outfan of squarer 404 connects the input of low pass filter 405, low pass filter 405
Outfan connects the input of decision device 406, and the outfan of decision device 406 connects the input of fixed pulse stretcher 407, Gu
Determine pulse stretcher 407 outfan connect trigger-type analog-digital converter 408 synchronization trigger input, trigger-type modulus turns
The outfan of parallel operation 408 connects the input of difference phase demodulation device 409；
Described difference phase demodulation device 409 includes that first shift register the 4091, second shift register 4092, numeral are taken advantage of
Method circuit 4093, average obtain circuit 4094 and threshold value decision circuit 4095；
The outfan of trigger-type analog-digital converter 408 connects the first shift register 4091, the first shift register 4091
The first outfan connect the input of the second shift register 4092, the second outfan of the first shift register 4091 connects
The first input end of digital multiplying circuit 4093, the outfan of the second shift register 4092 connects digital multiplying circuit 4093
Second input, the outfan of digital multiplying circuit 4093 connects average and obtains the input of circuit 4094, and average obtains circuit
The outfan of 4094 connects the input of threshold value decision circuit 4095.
Specifically, frequency-selecting filter 401 carries out frequency-selecting filter to the wideband pulse formula 2DPSK modulated signal through human body medium
Ripple, the wideband pulse formula 2DPSK modulated signal after carrying out frequency-selective filtering is amplified by low-noise amplifier 402, automatic gain
Control amplifier 403 and the wideband pulse formula 2DPSK modulated signal of a certain frequency range after amplifying carried out automatic growth control amplification,
Obtaining amplitude envelops stabilization signal r (t), point two-way output amplitude envelope stabilization signal r (t), squarer 404 is to first via amplitude
Envelope stabilization signal r (t) carries out square operation and obtains signal a (t), by low pass filter 405 further noise suppressed, filter
Ripple obtains signal b (t), after being made decisions b (t) by decision device 406, is fixed by fixed pulse stretcher 407 again
The pulse stretching operation of width, thus obtain synchronous digital pulse c (t), the pulse width of c (t) must be more than the arteries and veins of signal r (t)
Rush width, effective pulse information in r (t) can be collected ensureing that trigger-type analog-digital converter 408 is sampled every time, and often
Often group data d that secondary sampling time length and sampling are exportednT the data length (quantity of sampled point) of () is identical, work as synchronization
When digit pulse c (t) arrives, with the sample frequency more than or equal to 2 times of r (t) carrier frequencies, by trigger-type analog-digital converter
Sampling in 408 pairs of the second roads amplitude envelops stabilization signal r (t), obtains data dn (t) (n correspondence sampling number), pass through difference
Phase demodulator 409 settles recovery output base band absolute code data e (t) and synchronous digital pulse c (t) at one go；
Here when synchronous digital pulse c (t) i.e. finally demodulates the supporting synchronization exporting absolute code data e (t) as system
Clock；
Further, trigger-type analog-digital converter 408 is just sampled when the lock-out pulse of signal c (t) arrives, and is gathered
To data be i.e. the digital form of corresponding pulse signal in r (t), and remaining Time Triggered formula analog-digital converter 408 enters
Holding state does not export data；
Further, trigger-type analog-digital converter 408 output sampled data for the first time to the first shift register 4091, first
Shift register 4091 carries out shift LD operation to first time sampled data, obtains the first shift LD data dnT (), triggers
Formula analog-digital converter 408 output second time sampled data is to the first shift register 4091, and the first shift register 4091 is by the
One shift LD data dnT () exports to the second shift register 4092, the second shift register 4092 exports the first displacement and posts
Deposit data dnT () arrives digital multiplying circuit 4093, the first shift register 4091 carries out shift LD to second time sampled data
Operation, obtains the second shift LD data dn+1T (), the first shift register 4091 exports the second shift LD data dn+1(t)
To digital multiplying circuit 4093, such as, the first shift register 4091 output signal is expressed as dn(t)=COS (ω t), second
Shift register 4092 output signal is expressed as dn+1T ()=COS (ω t+ θ), digital multiplying circuit 4093 output signal can be with table
It is shown as:Obtained by average
Circuit 4094 obtains direct current mean value signalThe size of described direct current mean value signal q (t) i.e. embodies dn(t)
With dn+1T the phase information of () data, threshold value decision circuit 4095 compares q (t) and a certain mathematics threshold value set in advance, right
" logic 1 " or " logical zero " should be exported, thus realize the demodulation of pulsed 2DPSK unrelated signal.
As it is shown in figure 5, pulse-modulated signal receiving processing system is applied to human body medium when communicating, signal source 51 is produced
Signal uiSend into the input of 2DPSK transmitter 52, the people that the outfan of 2DPSK transmitter 52 person wherein is worn
Body medium sensor 1 launches wideband pulse formula 2DPSK signal un, signal unThe human body medium's letter built by two shaking hands of people
Road is sent to the human body medium's sensor 2 worn on the body of another person, human body medium's sensor 2 export wideband pulse formula
2DPSK signal u'n, then by the embodiment 53 of Fig. 4 to signal u'nCarry out the irrelevant reception of pulsed 2DPSK and demodulation, defeated
Go out base band data Data, complete Data data are processed finally by the internal host computer of computer 54, it is not necessary to complicated carrier wave
Synchronize the circuit such as recovery, Costas loop, high speed and real time sampling, low complex degree, low-power consumption and be easily integrated.
It is evidenced from the above discussion that, wideband pulse formula 2DPSK through human body medium is modulated by the present embodiment frequency-selecting filter
Signal carries out frequency-selective filtering, and the wideband pulse formula 2DPSK modulated signal after carrying out frequency-selective filtering is put by low-noise amplifier
Greatly, automatic gain control amplifier carries out automatic gain to the wideband pulse formula 2DPSK modulated signal of a certain frequency range after amplifying
Control to amplify, it is thus achieved that amplitude envelops stabilization signal；Squarer carries out square operation to first via amplitude envelops stabilization signal；Low pass
Wave filter extracts the envelope signal carried out after square operation in signal；The envelope signal extracted is made decisions by decision device, fixing
Pulse stretcher carries out pulse stretching according to predetermined pulse width to the envelope signal after making decisions, it is thus achieved that synchronous digital pulse
Signal；When synchronous digital pulse signal arrives, trigger-type analog-digital converter uses presets sample rate to the second road amplitude envelops
Stabilization signal is sampled；Last difference phase demodulation device is adopted for twice according to the second road amplitude envelops stabilization signal is carried out before and after
Adjacent two sampled datas that sample obtains, settle recovery output base band absolute code data at one go.The present invention uses pulsed 2DPSK
Modulated signal improves the band efficiency of human body channel, improves transmission rate, and system is operated in digital trigger-type state, directly
Tap into row carrier auxiliary, the per bit energy consumption of system can be brought with low-power consumption, low complex degree, advantage at a high speed in realization and show
Write and reduce, and CMOS integrated circuit technology can be used completely to realize, there is not large-area integrated resistor and electric capacity shaping electricity
Road, is suitable for being integrated in SOC, has good promotional value.
Pulse-modulated signal receiving handling method in one embodiment, as shown in Figure 6, comprises the following steps:
Step S601: pulsed 2DPSK modulated signal is carried out automatic growth control amplification, it is thus achieved that amplitude envelops is stably believed
Number, divide two-way to export described amplitude envelops stabilization signal；
Step S602: first via amplitude envelops stabilization signal is carried out square operation；
Step S603: extract the envelope signal in the first via amplitude envelops stabilization signal after carrying out square operation；
Step S604: make decisions described envelope signal, believes the envelope after making decisions according to predetermined pulse width
Number carry out pulse stretching, it is thus achieved that synchronous digital pulse signal, described predetermined pulse width is according to described amplitude envelops stabilization signal
Pulse width arrange；
Step S605: use default sample rate that the second road amplitude envelops is stably believed according to described synchronous digital pulse signal
Number sampling, described default sample rate is arranged according to the carrier frequency of described amplitude envelops stabilization signal；
Step S606: according to described second road amplitude envelops stabilization signal is carried out that before and after's double sampling obtains adjacent two
Individual sampled data, it is thus achieved that base band absolute code data.
Wideband pulse formula 2DPSK modulated signal through human body medium is carried out automatic growth control amplification, it is thus achieved that amplitude
Envelope stabilization signal r (t), by signal r (t) point two-way output i.e. a Yu b two-way, obtains signal a after carrying out a road signal square
T (), extracts envelope signal b (t) of signal a (t), makes decisions envelope signal b (t), according to predetermined pulse width to carrying out
Envelope signal after judgement carries out pulse stretching, obtains synchronous digital pulse c (t), when synchronous digital pulse c (t) arrives, with
B road signal is sampled by preset sample frequency, obtains data dnT () (n correspondence sampling number), obtains according to front and back's double sampling
Adjacent two sampled datas arrived, settle recovery output base band absolute code data e (t) and synchronised clock c (t) at one go.
It is evidenced from the above discussion that, pulse-modulated signal receiving handling method of the present invention, use pulsed 2DPSK modulated signal
Improve the band efficiency of human body channel, improve transmission rate, system is operated in digital trigger-type state, directly carries
Ripple recovers, and can bring the per bit energy consumption of system with low-power consumption, low complex degree, advantage at a high speed in realization and significantly reduce,
And CMOS integrated circuit technology can be used completely to realize, there is not large-area integrated resistor and electric capacity shaping circuit, be suitable for
It is integrated in SOC, there is good promotional value.
Additionally, in a concrete example, adopt for twice according to described second road amplitude envelops stabilization signal is carried out before and after
Adjacent two sampled datas that sample obtains, it is thus achieved that the mode of base band absolute code data includes:
Respectively described second road amplitude envelops stabilization signal is carried out adjacent two hits that before and after's double sampling obtains
According to carrying out shift LD operation, obtain the first shift LD data and the second shift LD data；
Described first shift LD data are multiplied with the second shift LD data；
Multiplied result according to described first shift LD data and the second shift LD data obtains direct current average；
When direct current average is more than preset first threshold value, export the first base band absolute code data；When direct current average is less than pre-
If during Second Threshold, exporting the second base band absolute code data, described preset first threshold value is more than described default Second Threshold.
Such as first shift LD tables of data is shown as dnT ()=COS (ω t), the second shift LD tables of data is shown as dn+1
T described first shift LD data are multiplied can be expressed as with the second shift LD data by ()=COS (ω t+ θ):Obtain direct current average
The size of described direct current mean value signal q (t) i.e. embodies dn(t) and dn+1The phase information of (t) data, compare q (t) and certain
One mathematics threshold value set in advance, corresponding output " logic 1 " or " logical zero ", thus realize pulsed 2DPSK unrelated signal solution
Adjust.When direct current average is more than preset first threshold value, d is describedn(t) and dn+1T the phase contrast of () data is zero, export the first base
Band absolute code data, i.e. " logical zero ", when direct current average is less than when presetting Second Threshold, illustrate dn(t) and dn+1The phase of (t) data
Potential difference is not zero, and exports the second base band absolute code data, i.e. " logic 1 ".
Additionally, in a concrete example, pulsed 2DPSK modulated signal is carried out automatic growth control amplification described
Before, further comprise the steps of:
Successively described pulsed 2DPSK modulated signal is carried out frequency-selective filtering and low noise amplification.
Amplifying the occasion of small-signal, low noise amplification can improve the signal to noise ratio of output.Can be according to actual needs
Obtain the signal of special frequency channel in pulsed 2DPSK modulated signal by frequency-selective filtering and carry out follow-up study process, be suitable for application.
Additionally, in a concrete example, described predetermined pulse width is more than the pulse of described amplitude envelops stabilization signal
Width, described default sample rate is more than or equal to the carrier frequency of the described amplitude envelops stabilization signal of twice.
Predetermined pulse width is more than the pulse width of amplitude envelops stabilization signal, to ensure that sampling can collect width every time
Effective pulse information in degree envelope stabilization signal, and often group data d that sampling time length and sampling are exported every timen
T the data length (quantity of sampled point) of () is identical.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic executed in example is all described, but, as long as the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that, come for those of ordinary skill in the art
Saying, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a pulse-modulated signal receiving processing system, it is characterised in that include automatic gain control amplifier, squarer,
Low pass filter, fixed pulse width decision device, trigger-type analog-digital converter and difference phase demodulation device；
The input input pulse formula 2DPSK modulated signal of described automatic gain control amplifier, described automatic growth control is put
The outfan of big device connects input and the signal input part of described trigger-type analog-digital converter of described squarer respectively, described
The outfan of squarer connects the input of described low pass filter, and the outfan of described low pass filter connects described fixing arteries and veins
Rushing the input of width decision device, the outfan of described fixed pulse width decision device connects described trigger-type analog-digital converter
Synchronizing to trigger input, the outfan of described trigger-type analog-digital converter connects the input of described difference phase demodulation device.
Pulse-modulated signal receiving processing system the most according to claim 1, it is characterised in that described difference phase demodulation
Device includes the first shift register, the second shift register and phase comparator；
The outfan of described trigger-type analog-digital converter connects described first shift register, the of described first shift register
One outfan connects the input of described second shift register, the second outfan of described first shift register and described the
The outfan of two shift registers connects the input of described phase comparator respectively.
Pulse-modulated signal receiving processing system the most according to claim 2, it is characterised in that described phase comparator bag
Include digital multiplying circuit, average obtains circuit and threshold value decision circuit；
Second outfan of described first shift register connects the first input end of described digital multiplying circuit, and described second moves
The outfan of bit register connects the second input of described digital multiplying circuit, and the outfan of described digital multiplying circuit connects
Described average obtains the input of circuit, and described average obtains the input of the outfan described threshold value decision circuit of connection of circuit
End.
Pulse-modulated signal receiving processing system the most as claimed in any of claims 1 to 3, it is characterised in that also
Including low-noise amplifier, the input of described low-noise amplifier inputs described pulsed 2DPSK modulated signal, described low noise
The outfan of acoustic amplifier connects the input of described automatic gain control amplifier.
Pulse-modulated signal receiving processing system the most according to claim 4, it is characterised in that also include frequency-selective filtering
Device, the input of described frequency-selecting filter inputs described pulsed 2DPSK modulated signal, and the outfan of described frequency-selecting filter is even
Connect the input of described low-noise amplifier.
Pulse-modulated signal receiving processing system the most according to claim 1, it is characterised in that described fixed pulse width
Decision device includes decision device and fixed pulse stretcher；
The outfan of described low pass filter connects the input of described decision device, and the outfan of described decision device connects described solid
Determining the input of pulse stretcher, the outfan of described fixed pulse stretcher connects the synchronization of described analog-digital converter and triggers defeated
Enter end.
7. a pulse-modulated signal receiving handling method, it is characterised in that comprise the following steps:
Pulsed 2DPSK modulated signal is carried out automatic growth control amplification, it is thus achieved that amplitude envelops stabilization signal, by described amplitude
Envelope stabilization signal divides two-way to export；
First via amplitude envelops stabilization signal is carried out square operation；
Extract the envelope signal in the first via amplitude envelops stabilization signal after carrying out square operation；
Described envelope signal is made decisions, according to predetermined pulse width, the envelope signal after making decisions is carried out pulse exhibition
Wide, it is thus achieved that synchronous digital pulse signal, described predetermined pulse width sets according to the pulse width of described amplitude envelops stabilization signal
Put；
Use default sample rate that the second road amplitude envelops stabilization signal is sampled according to described synchronous digital pulse signal, institute
State default sample rate to arrange according to the carrier frequency of described amplitude envelops stabilization signal；
Carry out, according to described second road amplitude envelops stabilization signal, adjacent two sampled datas that before and after's double sampling obtains, obtain
Obtain base band absolute code data.
Pulse-modulated signal receiving handling method the most according to claim 7, it is characterised in that according to described second tunnel
Amplitude envelops stabilization signal carries out adjacent two sampled datas that before and after's double sampling obtains, it is thus achieved that the side of base band absolute code data
Formula includes:
Described second road amplitude envelops stabilization signal carries out adjacent two sampled datas that before and after's double sampling obtains respectively enter
Row shift LD operates, and obtains the first shift LD data and the second shift LD data；
Described first shift LD data are multiplied with the second shift LD data；
Multiplied result according to described first shift LD data and the second shift LD data obtains direct current average；
When direct current average is more than preset first threshold value, export the first base band absolute code data；When direct current average is less than presetting the
During two threshold values, exporting the second base band absolute code data, described preset first threshold value is more than described default Second Threshold.
9. according to the pulse-modulated signal receiving handling method described in claim 7 or 8, it is characterised in that described to pulse
Before formula 2DPSK modulated signal carries out automatic growth control amplification, further comprise the steps of:
Successively described pulsed 2DPSK modulated signal is carried out frequency-selective filtering and low noise amplification.
Pulse-modulated signal receiving handling method the most according to claim 6, it is characterised in that described predetermined pulse width
Degree is more than the pulse width of described amplitude envelops stabilization signal, and described default sample rate is more than or equal to the described amplitude bag of twice
The carrier frequency of network stabilization signal.
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| CN114553646A (en) * | 2022-01-09 | 2022-05-27 | 苏州大学 | Reconfigurable modulation-demodulation system based on WBAN (white blood cell network) narrowband physical layer |
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