CN1142709A - Carrier amplituding method controlled by keys and models therefor - Google Patents
Carrier amplituding method controlled by keys and models therefor Download PDFInfo
- Publication number
- CN1142709A CN1142709A CN 96103041 CN96103041A CN1142709A CN 1142709 A CN1142709 A CN 1142709A CN 96103041 CN96103041 CN 96103041 CN 96103041 A CN96103041 A CN 96103041A CN 1142709 A CN1142709 A CN 1142709A
- Authority
- CN
- China
- Prior art keywords
- pulse
- amplitude
- carrier
- sinusoidal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
A modulation method features that a long series of pulses is used, in which the width of each pulse is equal to duration of carrier and the falling edge of the first pulse is coincided with the rising edge of the next pulse; an error correction code is appended to each field of signals; a digital modulation pulse sequence whose total width is equal to the frequency of carrier is used to modulate each cycle of carrier with ASK; and the frequency of modulated signals at sending output is equal to the frequency of carrier. Its advantages include reliable communication, low distortion, highs ecurity and multiplexing function.
Description
The present invention relates to the digital information transmission method in the communication technology, relate in particular to a kind of amplitude keying carrier modulating method.
Amplitude keying modulator approach in the existing digitally modulated carrier communication system is to represent a digital modulation pulse signal with some Zhou Zaibo through amplitude modulation(PAM), causes frequency resource not to be fully utilized.
The objective of the invention is to remedy the deficiencies in the prior art and propose a kind of amplitude keying carrier modulating method;
Another object of the present invention is to propose a kind of amplitude keying carrier modulator of implementing said method;
Another purpose of the present invention is to propose a kind of amplitude keying carrier wave demodulation device of implementing said method.
Purpose of the present invention is achieved by the following technical programs.
This amplitude keying carrier modulating method, useful information sampling that earlier will be to be transmitted quantizes to be transformed into a string digital pulse signal of representing with the form of numeral 0 and 1, in chronological sequence an order and an encoding law that the receipts communicating pair is set are in advance encoded then, and in cataloged procedure, insert the pulse code of identification, odd even and frame signal, to form a lot of digital modulation pulse train, modulate with the amplitude of this sequence offset of sinusoidal carrier wave again, it is characterized in that:
The width of each pulse in this link digitals modulated pulse trains equated with the cycle of carrier wave and the last pulse back edge of adjacent two pulses overlaps with the forward position of back one pulse, and all add error correcting code in the back of every frame signal, the overall width of this link digitals pulse equates with the frequency numerical value of carrier wave, can the corresponding insignificant digit pulse of additions and deletions before the afterbody of this link digitals pulse or error correcting code in each frame signal, overall width is equated with the frequency numerical value of carrier wave; With each week of above-mentioned a lot of digit pulse amplitude keying carrier wave, promptly with each all sinusoidal carrier wave through corresponding each message code of amplitude modulation(PAM) representative, the frequency of transmitting terminal modulated signal is that the frequency of carrier wave is identical with being subjected to tonal signal;
Transmit leg adopts specific amplitude keying carrier modulator, aforesaid a lot of digital modulation pulse train is modulated the carrier wave with fixed frequency, export a frequency and still be carrier frequency, phase place or 0 or 180 °, amplitude or 0 or 1 modulated signal, the input/output relation of setting modulator is: input digit modulating pulse 11 continuously, corresponding output phase is 0, amplitude is two all sine-shaped, sinusoidal modulated waves of 1, input digit modulating pulse 10 continuously, corresponding output phase place the last week is 0, amplitude be 1 sinusoidal then the preceding half cycle phase place in a week be 180 °, amplitude is that 1 sinusoidal and second half phase place are 180 °, amplitude is 0 modulated wave, input digit modulating pulse 00 continuously, and when the last pulse when 00 is 1, the half cycle phase place is 180 ° before the corresponding output, amplitude also is 1 a sinusoidal and the second half phase place is 180 °, amplitude be 0 and the back one all phase places be 0, amplitude also is 0 modulated wave, input digit modulating pulse 00 continuously, and when the last pulse when 00 also is 0, corresponding output phase is 0, amplitude also is two all modulated waves of 0, input digit modulating pulse 01 continuously, and when the last pulse when 01 is 1, the half cycle phase place is 180 ° before the corresponding output, amplitude is 180 ° in 1 sinusoidal and a second half phase place, amplitude be 0 and the back one all phase places be 0, amplitude is 1 sine-shaped, sinusoidal modulated wave, input digit modulating pulse 01 continuously, and when the last pulse when 01 was 0, corresponding output phase place the last week was 0, amplitude also is 0, back one all phase places are 0, amplitude is 1 sine-shaped, sinusoidal modulated wave.Above-mentioned amplitude is that 0 or 1 modulated wave is comparatively speaking, and in fact amplitude is still certain amplitude can be arranged at 0 o'clock, but very little with respect to 1.In addition, in the modulator late-class circuit, can not be provided with the resonant circuit that resonance frequency equals carrier frequency, and in transmission course, this resonant circuit can not be set.
The recipient adopts specific amplitude keying carrier wave demodulation device, and by setting and the antipodal input/output relation of said modulator, promptly can reappear the useful information that modulated signal transmits the recipient.
Aforesaid amplitude keying carrier modulator, comprise that one is connected to the preamplifier and the power amplifier that is connected to the transmitting system prime of carrier generator output, it is characterized in that being provided with on primary coil being connected to the preamplifier output and two, following symmetry and the identical intermediate connection of polarity be connected to the input transformer of the secondary coil on public ground, and thereafter the level on, the three gear electronic switches that are controlled by control circuit that underpass is separate, this control circuit has the two-way input control signal, one the tunnel is the width digital modulation pulse identical with carrier cycle, another road is to be half false impulse of carrier cycle in the cycle, on the three gear electronic switches, following gear with the carrier modulation of preamplifier output after respectively through last, underpass is transported to power amplifier, middle gear with the carrier wave of preamplifier output through public ground short circuit.
Aforesaid amplitude keying carrier wave demodulation device, comprise the modulated wave resonance amplifier, sinusoidal digital code twt amplifier reaches the carrier recovery circuit of level thereafter, another sinusoidal digital code twt amplifier reaches the schmidt trigger shaping circuit of level thereafter, it is characterized in that output at the modulated wave resonance amplifier, go into end and be provided with positive feedback branch, the input of modulated wave resonance amplifier is connected to prime digital carrier receiving circuit, the output of modulated wave resonance amplifier is provided with output transformer, its primary coil and an electric capacity are formed the high Q value resonant tank that resonance frequency equals carrier frequency, and secondary coil is connected to the input of two sinusoidal digital code twt amplifiers.
The present invention is novel, reliable communications, what its transmitted is that each has the sinusoidal carrier modulated signal of message code to the representative of process amplitude modulation(PAM) accordingly, distortion is little, strong security, be not subject to external interference, but the information transmitted amount is big, can transmits multichannel amplitude keying carrier information simultaneously side by side at same channel.As with the wireless transmission voice signal of the carrier frequency of 100 megahertzes, in the frequency range of 100 megahertzes ± 10 kilo hertz, can only transmit 1 road voice signal, transmit voice signal and use the present invention instead, set 8 kilo hertzs of sampling frequencies, and use 8 bit quantizations, add frame signal, identification signal, amount of information is 64 kilobits after error correction signal and the parity signal, because 100 megahertz carrier frequencies contain 100 megabit information capacities, therefore, can transmit 1500 road voice signals at least, in addition, can also open other frequency in addition in order to digital carrier communication in the frequency range of 100 megahertzes ± 10 kilo hertz, the amount of information of actual transmissions is bigger, be that the present invention can be alleviated the crowded phenomenon of channel significantly, make full use of frequency resource.
The present invention has the following drawings:
Fig. 1 adopts the preceding circuit composition block diagrams at different levels of modulator in the dispensing device of the present invention;
Fig. 2 adopts in the receiving system of the present invention behind the demodulator circuit at different levels to form block diagrams;
Fig. 3 is the oscillogram of embodiments of the invention circuit;
Wherein (a) is to be the carrier signal waveform figure of T0 in the cycle
(b) be digital modulation pulse code signal 110010 oscillograms
(c) being is the auxiliary pulse signal oscillogram of T0/2 in the cycle
(d) be corresponding sinusoidal digital code ripple oscillogram after recipient's demodulation
(e) be modulated signal oscillogram after the transmit leg modulation
Fig. 4 is the composition block diagram of amplitude keying carrier modulator of the present invention;
Fig. 5 is the embodiment circuit diagram of amplitude keying carrier modulator of the present invention;
Fig. 6 is the composition block diagram of amplitude keying carrier wave demodulation device of the present invention;
Fig. 7 is the embodiment circuit diagram of amplitude keying carrier wave demodulation device of the present invention.
Below in conjunction with embodiment and contrast accompanying drawing the present invention is made an explanation.
Transmit leg signal source 1～n to be sent is at first through separately filter amplifier, select a frequency band to be transmitted, 0～3400 of the audio frequency voice signal hertz of frequency band for example, deliver to sample circuit separately then, sample circuit is single taking turns to operate, sample circuit is controlled by clock-pulse generator, and its operating frequency is several times as much as the highest frequency of signal to be transmitted.Clock-pulse generator is before making first sample circuit work, at first allow frame synchronousing signal generator send a synchronizing signal, directly give shaping circuit, in like manner after hours at n sample circuit, allow n+1 error correction circuit send a string error correction pulse to shaping circuit, the signal pulse that sample circuit takes out is delivered to coding circuit and is carried out A/D conversion and also string conversion, produce a lot of digital modulation pulse, at first be frame synchronization, be the 1st or n pulse then, be at last n+1 error correction pulse through shaping, be sent to modulators modulate again, produce modulated signal, directly send through outside line.Whole system operation speed is to determine one by one respectively by the carrier wave that carrier generator produces, carrier wave is also given clock circuit except that sending to modulator, produce the various clock signals of circuit working, give clock-pulse generator again, produce various work lock-out pulses.
For realizing principal character of the present invention, with each week of a lot of digit pulse amplitude keying carrier wave, must overcome the output inertia of resonant circuit in the communication system, this output inertia is sinusoidal wave to resonant circuit when one week of input, it is sinusoidal wave that a week but is not only in its output, and the many weeks that also have amplitude to decay gradually are sinusoidal wave.The present invention is based on the energy offset principle, after import all amplitudes to resonant circuit be 1 signal, requiring next all sine wave is 0, be 1 and phase place is 180 ° a carrier wave to resonant circuit input half cycle amplitude just in next week, thereby the dump energy of output the last week makes resonant circuit be output as 0 the actual of this week in the bucking circuit.After the carrier wave of exporting from carrier generator 1 in the modulator of embodiment is exaggerated device 2 amplifications, deliver to resonance transformer T1, two groups of amplitudes of its secondary output size is consistent, but the output signal A and the B of 180 ° of phase phasic differences, signal A passes through electronic switch 3 with B and delivers to power amplifier 4.When nil modulating pulse 7 inputs, electronic switch 3 is in the G position, the output of nil carrier signal.When digital modulation pulse 1 of input, control circuit 5 make electronic switch 3 from the G position to the A position, have this moment all sine wave signals to be exaggerated device 4 and amplify back output by electronic switch 3.Back to back after digital modulation pulse 1 of input is 0, promptly imports 10, on the back edge of last pulse 1, control circuit 5 make electronic switch 3 from the A position to the B position.The time that stops in the B position is the half cycle sinusoidal period, then under the control of false impulse 6, make electronic switch 3 from the B position to the G position.This moment, amplifier 4 amplified the half cycle sine wave, and this half cycle sine wave is from B position input, phase place with aforesaid one week sine wave 180 ° of phasic differences mutually, but amplitude both are identical.Control circuit 5 makes electronic switch 3 open and close according to the rule of the input/output relation of setting under the dual input control of digital modulation pulse 7 and false impulse 6, exports corresponding modulated signal.
In the amplitude keying carrier modulator embodiment circuit shown in Fig. 5, IN1 is the carrier wave from carrier generator 1, transistor VT1 and output transformer T1 form amplifier 2, IN2 is the digital modulation pulse from prime, IN3 is the false impulse of input, transistor VT2, VT3 and form electronic switch 3 and control circuit 5 by flip and flop generator and transistor VT9 that transistor VT6, VT7 form, transistor VT4, VT5 and output transformer T2 form power amplifier 4, transistor VT8 is an inverter, and OUT is the modulated signal of this modulator output.
During no modulating pulse, the carrier wave that transistor VT1 sends IN1 here amplifies and is divided into two road signal A and the B that phase place is identical, amplitude equates.If IN2 does not have modulating pulse, the base stage of transistor VT2, VT3 all is a high level, transistor VT2, VT3 conducting, short circuit the carrier wave of A and B, back level transistor VT4, VT5 no-output, always be output as 0, suppose that the digital modulation pulse is 110010, when the modulating pulse of IN2 is 1, make the base stage of transistor VT2 become low level through inverter VT8, transistor VT2 ends, and transistor VT3 is still conducting.Carrier wave is transported to transistor VT4 from A, and the collector electrode of transistor VT4 is connected to the 0 phase place input C of output transformer T2, exports all phase places and be 0, amplitude is 1 sine wave.If next the IN2 modulating pulse is still 1, as above-mentioned, still export all phase places and be 0, amplitude is 1 sine wave.Suppose that the modulating pulse of following after 11 is 00, when second 1 lower edge of modulating pulse is come then, a positive spike has triggered the flip and flop generator of being made up of transistor VT6, VT7, make its upset, the transistor VT9 that is located at the flip and flop generator input can sponge the false impulse of IN3 during this, guarantees that bistable overturns reliably.The result of upset is that transistor VT3 ends, and transistor VT2 is owing to modulating pulse is 0 to become conducting, short circuit the A carrier wave, and the B carrier wave is sent to 180 ° of phase place input D that transistor VT5 amplifies and transport to output transformer T2, always is output as the half cycle phase place and is 180 °, amplitude and be 1 sine wave.Because the time of flip and flop generator upset is the cycle of half modulating pulse only, turned back original state by short its of false impulse IN3 again, so the second half output phase is 180 °, amplitude also is 0 sine wave, ensuing second modulating pulse 0, owing to still keep transistor VT2, VT3 conducting, output phase is 0, amplitude is still 0 sine wave.Then the modulating pulse after 00 is 10 o'clock, and transistor VT2 is by a modulating pulse cycle, and it is exported, and 1 all phase places are 0, amplitude is 1 sine wave.When modulating pulse became 0 by 1, as described above, overturn half modulating pulse week after date of flip and flop generator turned back, export half same-phase and be 180 °, amplitude and be 1 and phase place be that 180 °, amplitude are that week of 0 is sinusoidal wave.
The recipient at first delivers to demodulator from the modulated signal that outside line comes, with digital pulse signal and carrier separation wherein, carrier wave is sent to carrier oscillator again after amplifying, make recipient's carrier wave and transmit leg carrier synchronization, and then be sent to clock-signal generator, produce the bit synchronization pulse consistent with transmit leg.
Modulated signal is sent into the sinusoidal digital code ripple of modulated wave resonance amplifier 6 outputs, respectively after amplifier 7,9 amplifies, transport to schmidt shaping circuit 8 and carrier recovery circuit 10, transport to the sinusoidal digital code ripple of schmidt shaping circuit 8, be reduced into digital pulse signal, be sent to late-class circuit, the carrier wave of being exported by carrier recovery circuit 10 also is sent to its late-class circuit.In order to improve recipient's sensitivity, between the output of modulated wave resonance amplifier 6 and input, span into a positive feedback branch 11.If the modulated signal that receives is enough strong, also can not establish positive feedback branch 11.
In the amplitude keying carrier wave demodulation device embodiment circuit shown in Fig. 7, IN is the modulated signal from prime, transistor VT10 and resonance transformer T3 form modulated wave resonance amplifier 6, capacitor C and adjustable resistance RP form positive feedback branch 11, transistor VT12 forms amplifier 7, transistor VT13, VT14 form schmidt shaping circuit 8, transistor VT11 forms amplifier 9, resonance transformer T4 forms carrier recovery circuit 10, OUT1 is the code of the reproduction transmit leg pulse information of this demodulator output, and OUT2 is an exalted carrier.
After the next modulated signal process transistor VT10 amplification of circuit, deliver to the high Q value resonant circuit of forming by resonance transformer T3, resonance is on carrier frequency.Still enter and be example with 110010 digital carrier signals, when 11 signals enter, resonance transformer T3 exports two all sinusoidal digital code signals, the anti-phase half cycle sinusoidal signal of sending here at the 3rd all transistor VT10, just in time continue the dump energy counteracting of resonance with resonance transformer T3, the 3rd all no sinusoidal digital code signals, around the because transistor VT10 no signal is delivered to also no signal output of resonance transformer T3, the 5th all transistor VT10 send all sinusoidal carrier waves again here, and resonance transformer T3 exports all sinusoidal digital code signals.The 6th week, anti-phase half cycle sinusoidal signal that transistor VT10 sends here and resonance transformer T3 residue resonance signal were cancelled out each other as described above, and the 6th week was 0.The amplitude keying digital carrier signal of sending here from IN end 110010 obtains sinusoidal digital code signal resonance transformer T3 secondary.The signal of resonance transformer T3 is divided into three the tunnel, the one tunnel again and is fed back into end through positive feedback branch, to improve the receiving sensitivity of complete machine.Two-way after transistor VT11 and VT12 amplification, send resonance transformer T4 and transistor VT13, VT14 the schmidt shaping circuit of composition respectively in addition.Transistor VT11 delivers to the sinusoidal digital code signal of resonance transformer T4, because the inertia of resonant circuit reverts to carrier signal.And deliver to transistor VT13 by transistor VT12, the signal of the schmidt shaping circuit that VT14 forms, arrive with certain trigger point of deciding of last positive half cycle in sinusoidal signal by the characteristic of schmidt shaping circuit, the schmidt shaping circuit upset, form the upper edge of positive pulse, and in certain trigger point of still deciding of next negative half period by the characteristic of schmidt shaping circuit, schmidt shaping circuit turns back, form the lower edge of positive pulse, like this, two all sinusoidal code signals of input, two pulse signals 11 have just been become, and two all 00 signals of input because schmidt shaping circuit does not overturn, also are 00, what next week was imported is all sinusoidal digital code signals, makes the schmidt shaping circuit upset send a pulse as described above.And one 0 of corresponding back, schmidt shaping circuit output also is 0, by the digital carrier signal of importing on the circuit 110010, reverts to digit pulse code signal 110010 at the OUT1 output.
The digit pulse code of the output of demodulator sends two the tunnel, one the road delivers to comparison circuit, comparison circuit is compared it with the lock-out pulse that is produced by reception synchronization pulse generator, the lock-out pulse that the lock-out pulse that reception synchronization pulse generator produces and the frame synchronousing signal generator of transmit leg produce should be identical.If inequality, the closing control gate circuit, and wait for that successively next round compares again.If it is identical, open control gate circuit control clock-pulse generator and send two control impuls respectively from 1 to n successively, deliver to gate circuit for one, string and conversion switch circuit are opened in control, receive the string number pulse, and serial signal converted to parallel signal, deliver to decoding circuit again, carry out the D/A conversion, another opens the 1st～n electronic switch along separate routes successively respectively, to deliver to the 1st～n filter amplifier respectively through the pulse signal of D/A conversion, recovery is from 1 to n information, each branch switch is under the control of clock-pulse generator and the transmit leg synchronous working, and the output information behind the filter amplifier is consistent with the information of transmit leg, thus effective transmission of the information of realization.
Claims (3)
1, a kind of amplitude keying carrier modulating method, useful information sampling that earlier will be to be transmitted quantizes to be transformed into a string digital pulse signal of representing with the form of numeral 0 and 1, in chronological sequence an order and an encoding law that the receipts communicating pair is set are in advance encoded then, and in cataloged procedure, insert the pulse code of identification, odd even and frame signal, to form a lot of digital modulation pulse train, modulate with the amplitude of this sequence offset of sinusoidal carrier wave again, it is characterized in that:
1.1 the width of each pulse in this link digitals modulated pulse trains equated with the cycle of carrier wave and the last pulse back edge of adjacent two pulses overlaps with the forward position of back one pulse, and all add error correcting code in the back of every frame signal, the overall width of this link digitals pulse equates with the frequency numerical value of carrier wave, can the corresponding insignificant digit pulse of additions and deletions before the afterbody of this link digitals pulse or error correcting code in each frame signal, overall width is equated with the frequency numerical value of carrier wave;
1.2 with each week of above-mentioned a lot of digit pulse amplitude keying carrier wave, promptly with each all sinusoidal carrier wave through amplitude modulation(PAM), corresponding each message code of representative, the frequency of transmitting terminal modulated signal is that the frequency of carrier wave is identical with being subjected to tonal signal;
1.3 transmit leg adopts specific amplitude keying carrier modulator, aforesaid a lot of digital modulation pulse train is modulated the carrier wave with fixed frequency, export a frequency and still be carrier frequency, phase place or 0 or 180 °, amplitude or 0 or 1 modulated signal, the input/output relation of setting modulator is: input digit modulating pulse 11 continuously, corresponding output phase is 0, amplitude is two all sine-shaped, sinusoidal modulated waves of 1, input digit modulating pulse 10 continuously, corresponding output phase place the last week is 0, amplitude be 1 sinusoidal then the preceding half cycle phase place in a week be 180 °, amplitude is that 1 sinusoidal and second half phase place are 180 °, amplitude is 0 modulated wave, input digit modulating pulse 00 continuously, and when the last pulse when 00 is 1, the half cycle phase place is 180 ° before the corresponding output, amplitude also is 1 a sinusoidal and the second half phase place is 180 °, amplitude be 0 and the back one all phase places be 0, amplitude also is 0 modulated wave, input digit modulating pulse 00 continuously, and when the last pulse when 00 also is 0, corresponding output phase is 0, amplitude also is two all modulated waves of 0, input digit modulating pulse 01 continuously, and when the last pulse when 01 is 1, the half cycle phase place is 180 ° before the corresponding output, amplitude is 180 ° in 1 sinusoidal and a second half phase place, amplitude be 0 and the back one all phase places be 0, amplitude is 1 sine-shaped, sinusoidal modulated wave, input digit modulating pulse 01 continuously, and when the last pulse when 01 was 0, corresponding output phase place the last week was 0, amplitude also is 0, back one all phase places are 0, amplitude is 1 sine-shaped, sinusoidal modulated wave;
Adopt specific amplitude keying demodulator 1.4 receive, and setting and the antipodal input/output relation of said modulator.
2, a kind of amplitude keying carrier modulator, comprise that one is connected to the preamplifier and the power amplifier that is connected to the transmitting system prime of carrier generator output, it is characterized in that being provided with on primary coil being connected to the preamplifier output and two, following symmetry and the identical intermediate connection of polarity be connected to the input transformer of the secondary coil on public ground, and thereafter the level on, the three gear electronic switches that are controlled by control circuit that underpass is separate, this control circuit has the two-way input control signal, one the tunnel is the width digital modulation pulse identical with carrier cycle, another road is to be half false impulse of carrier cycle in the cycle, on the three gear electronic switches, following gear with the carrier modulation of preamplifier output after respectively through last, underpass is transported to power amplifier, middle gear with the carrier wave of preamplifier output through public ground short circuit.
3, a kind of amplitude keying carrier wave demodulation device, comprise the modulated wave resonance amplifier, sinusoidal digital code twt amplifier reaches the carrier recovery circuit of level thereafter, another sinusoidal digital code twt amplifier reaches the schmidt shaping circuit of level thereafter, it is characterized in that output at the modulated wave resonance amplifier, go into end and be provided with positive feedback branch, the input of modulated wave resonance amplifier is connected to prime digital carrier receiving circuit, the output of modulated wave resonance amplifier is provided with output transformer, its primary coil and an electric capacity are formed the high Q value resonant tank that resonance frequency equals carrier frequency, and secondary coil is connected to the input of two sinusoidal digital code twt amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96103041 CN1142709A (en) | 1996-03-06 | 1996-03-06 | Carrier amplituding method controlled by keys and models therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96103041 CN1142709A (en) | 1996-03-06 | 1996-03-06 | Carrier amplituding method controlled by keys and models therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1142709A true CN1142709A (en) | 1997-02-12 |
Family
ID=5117840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96103041 Pending CN1142709A (en) | 1996-03-06 | 1996-03-06 | Carrier amplituding method controlled by keys and models therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1142709A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161014B (en) * | 2005-09-05 | 2011-04-06 | 华为技术有限公司 | Method of implementing information transfer between radio equipments, radio equipment and radio communication system |
| US8982899B2 (en) | 2004-09-07 | 2015-03-17 | Freescale Semiconductor, Inc. | Apparatus and control interface therefor |
-
1996
- 1996-03-06 CN CN 96103041 patent/CN1142709A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8982899B2 (en) | 2004-09-07 | 2015-03-17 | Freescale Semiconductor, Inc. | Apparatus and control interface therefor |
| CN101161014B (en) * | 2005-09-05 | 2011-04-06 | 华为技术有限公司 | Method of implementing information transfer between radio equipments, radio equipment and radio communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4885582A (en) | "Simple code" encoder/decoder | |
| ATE218020T1 (en) | SYSTEM AND METHOD FOR GENERATING SIGNAL WAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM | |
| CN1096745C (en) | PPM demodulation device | |
| JPH01284036A (en) | Timing extracting circuit | |
| US3665474A (en) | High density communications system | |
| CN1142709A (en) | Carrier amplituding method controlled by keys and models therefor | |
| KR0137529B1 (en) | Quadrature quadrature | |
| CN2261685Y (en) | Carrier modulator controlled by keys | |
| CN1636368A (en) | DSP-based variable aperture code generation technique | |
| CN2264442Y (en) | Width key-controlled carrier wave demodulator | |
| RU2115172C1 (en) | Method and device for data transmission | |
| US4264973A (en) | Circuitry for transmitting clock information with pulse signals and for recovering such clock information | |
| GB1603938A (en) | Four phase staggered shift modulator | |
| US3492576A (en) | Differential phase modulated communication system | |
| AU4123989A (en) | System and method of transmitting a complex waveform over a communication channel utilizing lincompe x techniques | |
| US4319087A (en) | Secret communication system | |
| US3515991A (en) | High-speed correlative digital transmission system with orthogonal coherent recovery using absolute reference | |
| CN1091990C (en) | Pulse communication method and its device | |
| CA2121195A1 (en) | Digital Signal Transmission Device for Improvement of Anti-Multipath Feature, a Method of the Same and Digital Signal Transmission Waveform | |
| RU19618U1 (en) | CODED INFORMATION TRANSMISSION SYSTEM | |
| CN1086071C (en) | Digital transmission system, transmitter, receiver, equivalent analog signal, and transmission method | |
| RU2189058C1 (en) | Digital communication channel of seismic recording equipment | |
| DE3514462A1 (en) | Method for wireless transmission of messages | |
| RU2556439C2 (en) | Information transmission method and apparatus therefor | |
| JPS61290827A (en) | Optical space communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |