CN108134754A - A kind of intermediate frequency differential demodulator of gigabit continuous variable rate - Google Patents
A kind of intermediate frequency differential demodulator of gigabit continuous variable rate Download PDFInfo
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- CN108134754A CN108134754A CN201810018014.4A CN201810018014A CN108134754A CN 108134754 A CN108134754 A CN 108134754A CN 201810018014 A CN201810018014 A CN 201810018014A CN 108134754 A CN108134754 A CN 108134754A
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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
- H04L27/2331—Demodulator circuits; Receiver circuits using non-coherent demodulation wherein the received signal is demodulated using one or more delayed versions of itself
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- Computer Networks & Wireless Communication (AREA)
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Microwave Amplifiers (AREA)
Abstract
The invention discloses a kind of intermediate frequency differential demodulators of gigabit continuous variable rate, including signal input end of intermediate frequency, signal input end of intermediate frequency is respectively connected to the input terminal of the first amplifier and the second amplifier, the output terminal of first amplifier is connected to mixer input, the output terminal of second amplifier is connected to mixer input by variable time delay transmission line unit, variable time delay transmission line unit is by elongating or shortening the length of itself, to change the delay of signal；The output terminal of frequency mixer passes sequentially through wave filter, third amplifier is connected to fpga chip, and fpga chip is used to be demodulated signal processing and export to user terminal；Make signal delay continuously adjustable all the way by using the coaxial line of continuous variable-length, in addition signal delay is constant all the way, so as to make the consecutive variations of delay inequality, has widened the application range of the microwave link based on high-speed-differential demodulator significantly.
Description
【Technical field】
The invention belongs to wireless communication technology field, more particularly to a kind of intermediate frequency Difference Solution of gigabit continuous variable rate
Adjust device.
【Background technology】
Microwave link is one of means of communication of present mobile communication indispensability, is frequently used for geographical conditions complex environment.
These places usually can not build wired connection by means such as optical fiber.5th third-generation mobile communication technical standard formulate already close to
Coda, extensive commercialization will successively be unfolded in recent years.5th third-generation mobile communication its communications band is gradually to millimeter wave
Frequency range develops, and the frequency range used with microwave link is wanted to approach, such as 71-76GHz and 81-86GHz frequency ranges.So as to cell number
It can be completed according to the link connection with backbone network by single compound base station, microwave link can be combined into one shared with cell base station
Entire frequency range.
Microwave link often uses high-end FPGA cores when designing such system since its data rate is very high
Piece, this kind of chip interior have high speed differential data interface, can be directly connected to baseband signal data above these interfaces,
The high-speed differential interface RocketIO GTP rates for such as matching its inside of the Virtex-5 series of products of company of Sentos are 100Mb/s-
3.75Gb/s, Virtex-7 series of products rate reach as high as 28Gbps.Since its speed grade is higher than common mobile terminal
10 times or more, the modulation-demodulation technique used and common mobile terminal difference are larger.With processing data rate raising,
Cost, complexity, power consumption of circuit system etc. all sharply increase.In order to reduce circuit complexity and cost, need in many cases
It will be by the way of intermediate frequency differential ference spiral.For E frequency range microwave link communication systems, intermediate frequency is simultaneous here in 10GHz or so
Care for the bandwidth of baseband rate and occupancy.Such as in 4G-LTE systems the common speed grade of microwave link have 1.25Gbps and
2.5Gbps, base band data rate are 1.25G bauds, such as use its bit rate of difference BPSK modulation /demodulation as 1.25Gbps,
It is 2.5Gbps such as to modulate its bit rate using differential QPSK.Typically directly using FPGA high-speed differential interface into
Row data processing can further cancel the modulus conversion chip of high speed high power consumption, further reduce the cost in this way.
When real system is built, the system that generally requires different rates.Such as larger small of coverage area
Its speed grade of area is higher, at this time needs to be attached using the microwave link of 2.5Gbps rates.And for coverage area compared with
Small cell, speed grade need 100Mbps that can meet the requirements.Therefore, it is necessary to different grades of speed ranges.And it uses
Differential ference spiral need all the way signal relative in addition signal has a time delay all the way, meanwhile, this time delay is straight with baseband rate
It connects relevant.Existing product and system cannot all accomplish the continuously adjustable of baseband rate, greatly limit the relevance grade of product,
It needs to improve.
【Invention content】
The object of the present invention is to provide a kind of intermediate frequency differential demodulator of gigabit continuous variable rate, to solve existing skill
Baseband rate in art can not achieve the problem of continuously adjustable.
The present invention uses following technical scheme：A kind of intermediate frequency differential demodulator of gigabit continuous variable rate, including in
Frequency signal input part, signal input end of intermediate frequency are respectively connected to the input terminal of the first amplifier and the second amplifier, the first amplification
The output terminal of device is connected to mixer input, and the output terminal of the second amplifier is connected to mixed by variable time delay transmission line unit
Frequency device input terminal, variable time delay transmission line unit is by elongating or shortening the length of itself, to change the delay of signal；Frequency mixer
Output terminal pass sequentially through wave filter, third amplifier is connected to fpga chip, fpga chip is for being demodulated signal at place
It manages and exports to user terminal.
Further, variable time delay transmission line unit includes outer tube conductor, and being provided with inner sleeve in outer tube conductor leads
Body, outer tube conductor can be slided relative to inner sleeve conductor, to adjust the length of variable time delay transmission line unit；
Interior needle conductor is coaxially arranged in inner sleeve conductor, interior needle cannula conductor is coaxially arranged in outer tube conductor, it is interior
Needle cannula conductor is set in the outside of interior needle conductor；
Between outer tube conductor and inner sleeve conductor, between interior needle conductor and interior needle cannula conductor be clearance fit.
Further, it is respectively provided between outer tube conductor and interior needle cannula conductor, between inner sleeve conductor and interior needle conductor
There is supporter；
Outer tube conductor, inner sleeve conductor, interior needle conductor, interior needle cannula conductor material be copper, the material of supporter
For polytetrafluoroethylene (PTFE).
The invention also discloses a kind of intermediate frequency differential ference spiral methods of gigabit continuous variable rate, include the following steps：
Step 1, by input signal SIF(t) two-way is divided to be separately input into the first amplifier and the second amplifier, wherein, SIF
(t)=Asin [ω t+ θ (t)], A are signal amplitude, and ω is intermediate frequency angular frequency, and θ (t) is initial phase, and t is chronomere；
The output signal of second amplifier by variable time delay transmission line unit and is delivered to frequency mixer by step 2, and first
The output signal of amplifier is fed directly to frequency mixer, and the signal of two-way input mixer is respectively SIF2(t-τ2)=Asin [ω
(t-τ2)+θ(t-τ2)] and SIF1(t-τ1)=Asin [ω (t- τ1)+θ(t-τ1)], wherein, τ1It is due to PCB layout and by
Signal delay caused by one amplifier, τ2It is that the signal that PCB layout, the second amplifier and variable time delay transmission line unit introduce prolongs
Late；
Step 3, two paths of signals obtain baseband signal Y (t)=A by frequency mixer mixing, filter filtering successively2/2·
Sin (ω Δs τ+Δ θ), wherein, Δ τ=| τ2-τ1|, for the delay inequality of two paths of signals, Δ θ=θ (t)-θ (t- Δ τ) is poor
The phase difference of Coded；
Baseband signal Y (t) in step 3 is carried out limited range enlargement, and export two-way height by step 4 by third amplifier
Speed difference sub-signal；
Two paths of differential signals in step 4 is delivered to fpga chip and is demodulated processing and exports to user by step 5.
Further, Δ τ=fb, fbFor baseband signalling rate.
The beneficial effects of the invention are as follows：The present invention by using the coaxial line of continuous variable-length make all the way signal delay can
It continuously adjusts, in addition signal delay is constant all the way, and so as to make the consecutive variations of delay inequality, further, two-way time delayed signal enters
Mixing is completed to frequency mixer and after low pass, obtains baseband signal；By adjusting coaxial line length, correspondingly, baseband rate
Microwave link equipment can be made to be adjusted to different baseband rate and continuously adjustable under different rates scene, greatly with continuous variable
The big application range for having widened the microwave link based on high-speed-differential demodulator.
【Description of the drawings】
Fig. 1 is the functional block diagram of the intermediate frequency differential demodulator of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention；
Fig. 3 is the structure diagram of Variable delay transmission line in the present invention.
Wherein：1. outer sleeve conductor；2. inner sleeve conductor；Needle conductor in 3.；Needle sleeve conductor in 4.；5. supporter.
【Specific embodiment】
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The invention discloses a kind of intermediate frequency differential demodulator of gigabit (G-bit) continuous variable rate, as shown in Figure 1,
Including signal input end of intermediate frequency, after intermediate-freuqncy signal enters the demodulator of the present invention, it is divided into two-way, is respectively connected to the first amplification
The input terminal of device AMP1 and the second amplifier AMP2, the output terminal of the first amplifier AMP1 are connected to mixer input, and second
The output terminal of amplifier AMP2 is connected to mixer input, variable time delay transmission by variable time delay transmission line unit track1
Line unit track1 is by elongating or shortening the length of itself, to change the delay of signal.
As shown in figure 3, variable time delay transmission line unit track1 includes outer tube conductor 1, it is provided in outer tube conductor 1
Inner sleeve conductor 2, outer tube conductor 1 can be slided relative to inner sleeve conductor 2, to adjust variable time delay transmission line unit track1
Length.Interior needle conductor 3 is coaxially arranged in inner sleeve conductor 2, interior needle cannula conductor 4 is coaxially arranged in outer tube conductor 1,
Interior needle cannula conductor 4 is set in the outside of interior needle conductor 3.
Between outer tube conductor 1 and inner sleeve conductor 2, between interior needle conductor 3 and interior needle cannula conductor 4 be that gap is matched
It closes.Supporter 5 is both provided between outer tube conductor 1 and interior needle cannula conductor 4, between inner sleeve conductor 2 and interior needle conductor 3.
Outer tube conductor 1, inner sleeve conductor 2, interior needle conductor 3, interior needle cannula conductor 4 material be copper, the material of supporter 5 is poly-
Tetrafluoroethene.
The output terminal of frequency mixer passes sequentially through wave filter Filter1, third amplifier AMP3 is connected to fpga chip, FPGA
Chip is used to be demodulated signal processing and export to user terminal.
The invention also discloses a kind of intermediate frequency differential ference spiral methods of gigabit continuous variable rate, use above-mentioned lucky ratio
The intermediate frequency differential demodulator of special continuous variable rate, includes the following steps：
Step 1, by input signal SIF(t) two-way is divided to be separately input into the first amplifier AMP1 and the second amplifier AMP2,
Wherein, SIF(t)=Asin [ω t+ θ (t)], A are signal amplitude, and ω is intermediate frequency angular frequency, and θ (t) is initial phase, and t is the time
Unit.
The output signal of second amplifier AMP2 by variable time delay transmission line unit track1 and is delivered to by step 2
Frequency mixer, the output signal of the first amplifier AMP1 are fed directly to frequency mixer.
The signal of two-way input mixer is respectively SIF2(t-τ2)=Asin [ω (t- τ2)+θ(t-τ2)] and SIF1(t-τ1)
=Asin [ω (t- τ1)+θ(t-τ1)], wherein, τ1It is to prolong due to PCB layout and by signal caused by the first amplifier AMP1
Late, τ2It is the signal delay that PCB layout, the second amplifier AMP2 and variable time delay transmission line unit track1 are introduced.
Step 3, two paths of signals obtain baseband signal Y (t)=A by frequency mixer mixing, filter filtering successively2/2·
Sin (ω Δs τ+Δ θ), wherein, Δ τ=| τ2-τ1|, for the delay inequality of two paths of signals, Δ θ=θ (t)-θ (t- Δ τ) is poor
The phase difference of Coded.
When different rates are needed, when such as arbitrary transmission rate between 100Mbps-1.25Gbps, pass through tune
The length of whole transmission line is the value of adjustable Δ τ, and Δ τ is the delay inequality of two paths of signals, contains the time delay of transmission line, circuit board
The time delay of wiring, and delay inequality is adjustable.Meet Δ τ, Δ τ=fb, fbFor baseband signalling rate, i.e., just accorded with for adjacent base band
Number interval, output signal-to-noise ratio is maximum at this time, detection efficiency highest.
Baseband signal Y (t) in step 3 is carried out limited range enlargement, and export two-way height by step 4 by third amplifier
Speed difference sub-signal.
Two paths of differential signals in step 4 is delivered to fpga chip and is demodulated processing and exports to user by step 5.
As shown in Fig. 2, the physical circuit figure for the present embodiment, the frequency range of intermediate frequency are taken as 3-6GHz, wherein, during IN is
Frequency signal input port, OUT+, OUT- are respectively differential signal output interface.Incoming signal level is more than -35dBm；AMP1、
AMP2 model HMC7891, the module provide the gain of 43dB, and Maximum Output Level P1dB is 10dBm, meets mixer drive
It is required that supply voltage is+8V, AMP3 model MAX3272A, single-ended power+3.3V, L1, L2, C1, C2, C3 constitute low
Bandpass filter.
Single-ended signal is transformed to differential signal by the device, and differential signal can enter directly into FPGA processing；FPGA is adopted
With Virtex5 chip XC5VLX30T, high-speed differential interface rate can configure adjustment.
Claims (5)
1. a kind of intermediate frequency differential demodulator of gigabit continuous variable rate, which is characterized in that including signal input end of intermediate frequency, institute
State the input terminal that signal input end of intermediate frequency is respectively connected to the first amplifier and the second amplifier, the output of first amplifier
End is connected to mixer input, and the output terminal of second amplifier is connected to described mix by variable time delay transmission line unit
Frequency device input terminal, the variable time delay transmission line unit is by elongating or shortening the length of itself, to change the delay of signal；Institute
The output terminal for stating frequency mixer passes sequentially through wave filter, third amplifier is connected to fpga chip, and the fpga chip is used for letter
It number is demodulated processing and exports to user terminal.
2. a kind of intermediate frequency differential demodulator of gigabit continuous variable rate as described in claim 1, which is characterized in that described
Variable time delay transmission line unit includes outer tube conductor (1), and inner sleeve conductor (2), institute are provided in the outer tube conductor (1)
Stating outer tube conductor (1) can slide relative to inner sleeve conductor (2), to adjust the length of variable time delay transmission line unit；
Interior needle conductor (3) is coaxially arranged in the inner sleeve conductor (2), is coaxially arranged in the outer tube conductor (1) interior
Needle cannula conductor (4), the interior needle cannula conductor (4) are set in the outside of interior needle conductor (3)；
It is between the outer tube conductor (1) and inner sleeve conductor (2), between interior needle conductor (3) and interior needle cannula conductor (4)
Clearance fit.
3. a kind of intermediate frequency differential demodulator of gigabit continuous variable rate as claimed in claim 2, which is characterized in that described
Support is both provided between outer tube conductor (1) and interior needle cannula conductor (4), between inner sleeve conductor (2) and interior needle conductor (3)
Body (5)；
The outer tube conductor (1), inner sleeve conductor (2), interior needle conductor (3), interior needle cannula conductor (4) material be copper,
The material of the supporter (5) is polytetrafluoroethylene (PTFE).
4. a kind of intermediate frequency differential ference spiral method of gigabit continuous variable rate as described in any one of claims 1-3, feature
It is, includes the following steps：
Step 1, by input signal SIF(t) two-way is divided to be separately input into the first amplifier and the second amplifier, wherein, SIF(t)=
Asin [ω t+ θ (t)], A are signal amplitude, and ω is intermediate frequency angular frequency, and θ (t) is initial phase, and t is chronomere；
The output signal of second amplifier by variable time delay transmission line unit and is delivered to frequency mixer by step 2, the first amplification
The output signal of device is fed directly to frequency mixer, and the signal of two-way input mixer is respectively SIF2(t-τ2)=Asin [ω (t-
τ2)+θ(t-τ2)] and SIF1(t-τ1)=Asin [ω (t- τ1)+θ(t-τ1)], wherein, τ1It is due to PCB layout and by first
Signal delay caused by amplifier, τ2It is that the signal that PCB layout, the second amplifier and variable time delay transmission line unit introduce prolongs
Late；
Step 3, two paths of signals obtain baseband signal Y (t)=A by frequency mixer mixing, filter filtering successively2/2·sin
(ω Δs τ+Δ θ), wherein, Δ τ=| τ2-τ1|, for the delay inequality of two paths of signals, Δ θ=θ (t)-θ (t- Δ τ) is compiled for difference
The phase difference of code；
Baseband signal Y (t) in step 3 is carried out limited range enlargement, and export the high speed difference of two-way by step 4 by third amplifier
Sub-signal；
Two paths of differential signals in step 4 is delivered to fpga chip and is demodulated processing and exports to user by step 5.
A kind of 5. intermediate frequency differential ference spiral method of gigabit continuous variable rate as claimed in claim 4, which is characterized in that institute
State Δ τ=fb, fbFor baseband signalling rate.
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Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3613019A (en) * | 1969-04-08 | 1971-10-12 | Kokusai Denshin Denwa Co Ltd | Burst-signal-demodulating circuit arrangement |
| US4366547A (en) * | 1980-09-18 | 1982-12-28 | Codex Corporation | Digital filter with scaled tap coefficients |
| EP0167157A2 (en) * | 1984-07-05 | 1986-01-08 | Hewlett-Packard Company | Delay circuit |
| JPS6190555A (en) * | 1984-10-11 | 1986-05-08 | Omron Tateisi Electronics Co | Demodulation circuit of dpsk modulation wave |
| CN1129501A (en) * | 1994-06-10 | 1996-08-21 | Ntt移动通信网株式会社 | Receiver |
| CN1154017A (en) * | 1995-08-31 | 1997-07-09 | 三菱电机株式会社 | Digital radiocommunication receiver |
| CN1171672A (en) * | 1996-05-27 | 1998-01-28 | 索尼公司 | Receiving method and receiving apparatus |
| CN1710898A (en) * | 2005-06-29 | 2005-12-21 | 西安电子科技大学 | Modulation and demodulation method for continuous phase signals |
| CN1798121A (en) * | 2004-12-22 | 2006-07-05 | 阿尔卡特公司 | Dpsk demodulator and demodulating method |
| CN1815930A (en) * | 2005-01-31 | 2006-08-09 | 富士通株式会社 | Optical receiver and optical reception method compatible with differential quadrature phase shift keying |
| CN1835488A (en) * | 2005-03-14 | 2006-09-20 | 华为技术有限公司 | Baseband demodulation preprocessing system |
| CN101094010A (en) * | 2007-05-31 | 2007-12-26 | ***通信集团广东有限公司 | A receiver |
| CN101141018A (en) * | 2007-10-30 | 2008-03-12 | 南京恒电电子有限公司 | Microwave controllable multiple wavelengths delay-line phase moving method and phase shifter |
| CN101162948A (en) * | 2006-10-13 | 2008-04-16 | 阿尔卡特朗讯 | Method and receiver to increase the spectral efficiency of dpsk modulation format |
| CN201130945Y (en) * | 2007-12-17 | 2008-10-08 | 南京吸铁石科技有限公司 | Apparatus capable of modulating and demodulating with variable speed |
| CN101432998A (en) * | 2006-04-26 | 2009-05-13 | 明特拉公司 | Partial DPSK (PDPSK) transmission systems |
| CN101558587A (en) * | 2006-12-13 | 2009-10-14 | 日本电气株式会社 | Light reception device and light reception method |
| CN201341120Y (en) * | 2008-11-04 | 2009-11-04 | 东莞理工学院 | Controllable delay line |
| CN201550137U (en) * | 2009-11-06 | 2010-08-11 | 福州高意通讯有限公司 | Optical differential phase shift keying demodulation device |
| CN101958864A (en) * | 2010-09-21 | 2011-01-26 | 武汉光迅科技股份有限公司 | Multi-speed difference quadrature phase shift keying demodulator and control method thereof |
| CN102273066A (en) * | 2008-12-09 | 2011-12-07 | 高通股份有限公司 | Digital phase-locked loop with two-point modulation and adaptive delay matching |
| CN102349262A (en) * | 2009-03-11 | 2012-02-08 | 高通股份有限公司 | Wideband phase modulator |
| CN103023843A (en) * | 2012-12-18 | 2013-04-03 | 江苏指南针导航通信技术有限公司 | Modulation circuit and communication device |
| CN104980387A (en) * | 2014-04-10 | 2015-10-14 | 三菱电机株式会社 | Differential demodulator and differential demodulation method |
| CN105306397A (en) * | 2015-11-13 | 2016-02-03 | 成都天奥信息科技有限公司 | DQPSK intermediate frequency differential demodulation method |
-
2018
- 2018-01-09 CN CN201810018014.4A patent/CN108134754B/en not_active Expired - Fee Related
Patent Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3613019A (en) * | 1969-04-08 | 1971-10-12 | Kokusai Denshin Denwa Co Ltd | Burst-signal-demodulating circuit arrangement |
| US4366547A (en) * | 1980-09-18 | 1982-12-28 | Codex Corporation | Digital filter with scaled tap coefficients |
| EP0167157A2 (en) * | 1984-07-05 | 1986-01-08 | Hewlett-Packard Company | Delay circuit |
| JPS6190555A (en) * | 1984-10-11 | 1986-05-08 | Omron Tateisi Electronics Co | Demodulation circuit of dpsk modulation wave |
| CN1129501A (en) * | 1994-06-10 | 1996-08-21 | Ntt移动通信网株式会社 | Receiver |
| CN1154017A (en) * | 1995-08-31 | 1997-07-09 | 三菱电机株式会社 | Digital radiocommunication receiver |
| CN1171672A (en) * | 1996-05-27 | 1998-01-28 | 索尼公司 | Receiving method and receiving apparatus |
| CN1798121A (en) * | 2004-12-22 | 2006-07-05 | 阿尔卡特公司 | Dpsk demodulator and demodulating method |
| CN1815930A (en) * | 2005-01-31 | 2006-08-09 | 富士通株式会社 | Optical receiver and optical reception method compatible with differential quadrature phase shift keying |
| CN1835488A (en) * | 2005-03-14 | 2006-09-20 | 华为技术有限公司 | Baseband demodulation preprocessing system |
| CN1710898A (en) * | 2005-06-29 | 2005-12-21 | 西安电子科技大学 | Modulation and demodulation method for continuous phase signals |
| CN101432998A (en) * | 2006-04-26 | 2009-05-13 | 明特拉公司 | Partial DPSK (PDPSK) transmission systems |
| CN101162948A (en) * | 2006-10-13 | 2008-04-16 | 阿尔卡特朗讯 | Method and receiver to increase the spectral efficiency of dpsk modulation format |
| CN101558587A (en) * | 2006-12-13 | 2009-10-14 | 日本电气株式会社 | Light reception device and light reception method |
| CN101094010A (en) * | 2007-05-31 | 2007-12-26 | ***通信集团广东有限公司 | A receiver |
| CN101141018A (en) * | 2007-10-30 | 2008-03-12 | 南京恒电电子有限公司 | Microwave controllable multiple wavelengths delay-line phase moving method and phase shifter |
| CN201130945Y (en) * | 2007-12-17 | 2008-10-08 | 南京吸铁石科技有限公司 | Apparatus capable of modulating and demodulating with variable speed |
| CN201341120Y (en) * | 2008-11-04 | 2009-11-04 | 东莞理工学院 | Controllable delay line |
| CN102273066A (en) * | 2008-12-09 | 2011-12-07 | 高通股份有限公司 | Digital phase-locked loop with two-point modulation and adaptive delay matching |
| CN102349262A (en) * | 2009-03-11 | 2012-02-08 | 高通股份有限公司 | Wideband phase modulator |
| CN201550137U (en) * | 2009-11-06 | 2010-08-11 | 福州高意通讯有限公司 | Optical differential phase shift keying demodulation device |
| CN101958864A (en) * | 2010-09-21 | 2011-01-26 | 武汉光迅科技股份有限公司 | Multi-speed difference quadrature phase shift keying demodulator and control method thereof |
| CN103023843A (en) * | 2012-12-18 | 2013-04-03 | 江苏指南针导航通信技术有限公司 | Modulation circuit and communication device |
| CN104980387A (en) * | 2014-04-10 | 2015-10-14 | 三菱电机株式会社 | Differential demodulator and differential demodulation method |
| CN105306397A (en) * | 2015-11-13 | 2016-02-03 | 成都天奥信息科技有限公司 | DQPSK intermediate frequency differential demodulation method |
Non-Patent Citations (3)
| Title |
|---|
| 刘乃安 等: "突发扩频通信中的中频差分解调器及其性能", 《通信技术》 * |
| 强刚 等: "专用集成电路与中频差分解调实现扩频通信", 《西安电子科技大学学报(自然科学版)》 * |
| 苟彦新: "《无线电抗截获抗干扰通信》", 31 December 2010, 西安电子科技大学出版社 * |
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