CN101369898A - Meteor trail self-adapting variable-velocity burst modem - Google Patents
Meteor trail self-adapting variable-velocity burst modem Download PDFInfo
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Abstract
The invention discloses a meteor burst self-adapting variable rate burst modem relating to a strong-anti-sudden and anti-rapid fading meteor burst modem device in the communication field. The device comprises a codec, a modem, an upconverter, a filter, an amplifier, a variable rate modulation protocol controller, a signal-noise ratio estimator, a variable demodulation protocol controller, an automatic gain control amplifier, a geophone and a power. The meteor burst self-adapting variable rate burst modem can automatically adjust the information transmission rate according to the channel status, the transmitting frequency is adjustable and controllable. The redundant information in the data is reduced and the information transmission efficiency is improved by using a rapid frame structure identification, rapid synchronization and rapid convergence technology. The meteor burst self-adapting variable rate burst modem of the invention has advantages of high integration degree, simple circuit, small size, easy operation and stable and reliable performance and is especial for the meteor burst channel with strong burst, rapid fading and short lifespan of channel.
Description
Technical field
The present invention relates to a kind of Meteor trail self-adapting variable-velocity burst modem in the communications field.Be specially adapted to make modem apparatus in sudden strong, the meteoric trail communication channel that decline is fast.
Background technology
When data were transmitted on sudden strong, meteor trail channel that decline is fast, under the very short situation of the up duration of particularly communicating by letter, common continuous communiction mode adopted long data code flow and error correcting code structure can not be suitable for.Therefore must adopt certain quick, reliable transmission that the designed agreement of burst communication and demodulation structure guarantee data that aim at.Because meteor trail channel happens suddenly, and the channel life period is short, therefore needs short data frame length.But the decline of channel requires error correction coding to have strong error correcting capability again, and this just requires the Frame again can not be too short.In addition in the burst communication process, the problem that because call duration time is very short, it is desired fast synchronously to system, convergence fast, fast frame format discriminance etc. all are in continuous communiction not faced.Because what adopt in traditional meteor-burst communication is the fixed-rate transmission pattern, the message capacity that when channel condition is better relatively channel is provided has caused waste, thereby has influenced communication efficiency.
Summary of the invention
The objective of the invention is to avoid the weak point in the above-mentioned background technology and the real-time estimated snr of a kind of energy is provided and sends length, information modulation system, the adaptive meteoric trail variable Rate of rate of information throughput burst modem according to signal-to-noise ratio (SNR) estimation realization information as a result.Use the present invention can effectively improve the efficiency of transmission of data on sudden strong, meteor trail channel that decline is fast.Characteristics such as the present invention also has integrated degree height, circuit is simple, volume is little, easy to use, stable and reliable for performance.
The object of the present invention is achieved like this: the present invention includes encoder 1, modulator 2, upconverter 3, filter 4, amplifier 5, variable Rate modulation protocol controller 6, SNR estimator 7, variable Rate demodulation protocol controller 8, press down mirror filter 9, frequency mixer 10, intermediate-frequency filter 11, automatic gain control amplifier 12, frequency overlapped-resistable filter 13, demodulator 14, decoder 15, wave detector 16, power supply 30; Described encoder 1 input port 1 links to each other with input signal port A, and output port 3 links to each other with output signal port B after being connected in series modulator 2, upconverter 3, filter 4, amplifier 5 successively; Variable Rate modulation protocol controller 6 input ports 1 link to each other with input signal port C, and input port 2 links to each other with SNR estimator 7 output ports 2; Output port 3 to 7 links to each other with encoder 1, modulator 2, upconverter 3, filter 4, amplifier 5 each input port 2 respectively; SNR estimator 7 input ports 1 link to each other with wave detector 16 output ports 1; Press down mirror filter 9 input ports 1 and link to each other with input signal port E, output port 2 links to each other with output signal port F after being connected in series frequency mixer 10, intermediate-frequency filter 11, automatic gain control amplifier 12, frequency overlapped-resistable filter 13, demodulator 14, decoder 15 successively; Intermediate-frequency filter 11 output ports 2 link to each other with wave detector 16 input ports 2; Variable Rate demodulation protocol controller 8 input ports 1 link to each other with input signal port D, and input port 2 links to each other with the output port 4 of demodulator 14, and output port 3 links to each other with the input port 3 of demodulator 14; Power supply 30 goes out the corresponding power end with each parts of end+V voltage end and connects, and each parts direct-current working volts are provided;
Described encoder 1 will carry out buffer memory and it will be carried out chnnel coding and the protection of increase frame head from the data that input port A sends here; The effect of modulator 2 exports encoder 1 input data-modulated to upconverter 3 after low-intermediate frequency; Upconverter 3 is delivered to filter 4 with modulator 2 input data-modulated behind rf frequency; Filter 4 is selected upconverter 3 input signal filtering image frequency signals correct radiofrequency signal and is exported amplifier 5 to; Amplifier 5 amplifies the power of filter 4 input signals, exports signal port B to by output port 3; Pressing down mirror filter 9 will carry out filtering from the signal that input port C sends here, export frequency mixer 10 to after noise that the filtering band is outer and the interference; Frequency mixer 10 carries out the signal of filter 9 inputs to export intermediate-frequency filter 11 to behind the frequency spectrum shift; Intermediate-frequency filter 11 carries out frequency mixer 10 input signals to export automatic gain control amplifier 12, wave detector 16 respectively to after the frequency-selecting; Export frequency overlapped-resistable filter 13 to behind the amplitude stabilization of automatic gain control amplifier 12 with intermediate-frequency filter 11 input signals; Frequency overlapped-resistable filter 13 exports demodulator 14 to after with automatic gain control amplifier 12 input signal filtering out-of-band noise components; Demodulator 14 carries out filtering, down-sampled and saturated processing with frequency overlapped-resistable filter 13 input signals, after extracting bit timing and carrier wave, with primary signal phase demodulation demodulation together, digital signal after the phase demodulation demodulation is carried out frame format and is differentiated, identify collection of letters speed type, export variable Rate demodulation protocol controller 8 to and carry out the demodulator front-end control; Another way word signal after the demodulator 14 phase demodulation demodulation exports decoder 15 to; Decoder 15 demodulator 14 input signals are decoded and remove redundant information after export output port F to; The frame format identification signal of data that variable Rate demodulation protocol controller 8 is sent input port D here and demodulator 14 inputs is converted to control signal and exports control command to demodulator 14 control phase demodulation demodulation by output port 3; Wave detector 16 carries out intermediate-frequency filter 11 input signals amplitude detection and exports the voltage signal that reflects received signal intensity after the detection to SNR estimator 7; The signal to noise ratio of 7 pairs of wave detector 16 input signals of SNR estimator is estimated in real time and the signal to noise ratio of estimating is in real time exported to variable Rate modulation protocol controller 6, is used for auxiliary decision and sends signal rate; Variable Rate modulation protocol controller 6 is selected suitable modulation system and information rate according to the estimated value of SNR estimator 7 input, exports encoder 1, modulator 2, upconverter 3, filter 4, amplifier 5 each input port 2 to and carries out the control of modulation system and information rate.
Described filter selects 20 frequency overlapped-resistable filter 13 input signals are carried out exporting down-sampled processor 21 to after the matched filtering; Down-sampled processor 21 selects 20 input signals to carry out exporting the saturated processing 22 of self adaptation to after the down-sampled processing in filter; The saturated processing 22 of self adaptation is carried out down-sampled processor 21 input signals to export adaptive carrier extractor 23, phase discriminator 25, quick time extractor 26 to after the saturated processing; Adaptive carrier extractor 23 exports phase discriminator 25 to after saturated processing 22 input signals of self adaptation are extracted carrier wave; Time extractor 26 exports adaptive carrier extractor 23, phase discriminator 25 to after extracting saturated processing 22 input signals of self adaptation regularly fast; Phase discriminator 25 carries out adaptive carrier extractor 23 carrier signal of extracting and the timing signal that quick time extractor 26 extracts to export frame format identifier 24 and decoder 15 to behind the phase demodulation; Frame format identifier 24 carries out frame format with phase discriminator 25 input signals and differentiates, identify collection of letters speed type and export variable Rate demodulation protocol controller 8 to and carry out the demodulator front-end control, phase discriminator 25 another road output signals export decoder 15 decoding backs to and are exported by output signal port F.
The present invention compares background technology following advantage:
1. the present invention has adopted SNR estimator 7 real-time estimated snrs and has been determined coding form, the modulation system of the information that sends and transmit information rate according to the signal to noise ratio result by variable Rate modulation protocol controller 6, on the reliable correct basis of guarantee information transmission, make channel transport efficiency more abundant.
2. encoder 1 energy adaptive coding of the present invention has guaranteed higher coding gain, and weak point, signal reception less burst period of amplitude are fully utilized to make the duration.
3. the frequency adjustable of upconverter 3 of the present invention is controlled, can effectively avoid the narrow band interference in the meteor-burst communication frequency range.
The present invention adopted demodulator 14 can realize fast frame structure identification, fast synchronously, convergence technology fast effectively reduces the redundant information in the data, improved information transfer efficiency.
5. circuit block of the present invention adopts extensive programmable integrated circuit to make, and has advantages such as circuit is simple, volume is little, with low cost, stable and reliable for performance, and is practical in engineering.
Description of drawings
Fig. 1 is the electric functional-block diagram of the embodiment of the invention.
Fig. 2 is the electrical schematic diagram of demodulator 14 embodiment of the present invention.
Embodiment
With reference to Fig. 1, Fig. 2, the present invention by encoder 1, modulator 2, upconverter 3, filter 4, amplifier 5, variable Rate modulation protocol controller 6, SNR estimator 7, variable Rate demodulation protocol controller 8, press down mirror filter 9, frequency mixer 10, intermediate-frequency filter 11, automatic gain control amplifier 12, frequency overlapped-resistable filter 13, demodulator 14, decoder 15, wave detector 16 and power supply 30 and form.Fig. 1 is an electric functional-block diagram of the present invention, and embodiment presses Fig. 1 connection line.At transmitting terminal, the effect of encoder 1 is that buffer memory carries out chnnel coding and increases the frame head protection from the input data A of outside and to it.The effect of variable Rate modulation protocol controller 6 is to select suitable modulation system and information rate.The effect of modulator 2 is according to variable Rate modulation protocol controller 6 selected modulation system and information rates, and the data-modulated of own coding device 1 is on the frequency of Low Medium Frequency in the future.The effect of upconverter 3 is that the data-modulated of automodulation device 2 in the future is on the frequency of radio frequency.The effect of filter 4 is with the target signal filter image frequency signal from upconverter 3, selects correct radiofrequency signal, gives amplifier 5.Amplifier 5 is finished the amplification to signal power, and exports signal output port B to.At receiving terminal, but mirror filter 9 finishes receiving from the signal of input port E input and to noise and interference outside its band and carries out filtering, only useful signal is carried out frequency-selecting, give frequency mixer 10 signal then, frequency mixer 10 is given intermediate-frequency filter 11 with signal after finishing spectrum of radio frequency signals being moved.Intermediate-frequency filter 11 is given automatic gain control amplifier 12 and wave detector 16 with signal after finishing frequency-selecting to signal.Automatic gain control amplifier 12 carries out the stable of signal amplitude, and gives frequency overlapped-resistable filter 13 with signal.Behind the frequency overlapped-resistable filter 13 filtering out-of-band noise components, give demodulator 14 with signal.After 14 pairs of signals of demodulator carry out filtering, down-sampled and saturated processing, to low sampling rate signal extraction bit timing and carrier wave, after bit timing and carrier wave all extract, with primary signal phase demodulation demodulation together, digital signal one tunnel behind the phase demodulation is carried out frame format and is differentiated, identify collection of letters speed type, carry out the demodulator front-end control for variable Rate demodulation protocol controller 8, external output signal F is given after exporting to decoder 15 decodings in another road.Wave detector 16 carries out amplitude detection with the signal of intermediate-frequency filter 11 inputs, the voltage signal of reflection received signal intensity is given SNR estimator 7 after the detection, SNR estimator 7 signal to noise ratio to received signal estimates that in real time real-time estimated value exports the variable Rate modulation protocol controller 6 of making a start to and carries out variable Rate control.Embodiment encoder 1, modulator 2, upconverter 3, filter 4, variable Rate modulation protocol controller 6, SNR estimator 7, variable Rate demodulation protocol controller 8, press down mirror filter 9, frequency mixer 10, decoder 15 all adopts a field programmable gate array (FPGA) production of integrated circuits, amplifier 5 adopts the chip MAR-3 of MINI company to make, intermediate-frequency filter 11 adopts the crystal narrow band filter of the company in sky, Chengdu to make, automatic gain control amplifier 12 functions mainly adopt the AD8367 of AD company to make, and frequency overlapped-resistable filter 13 adopts PLP-15 low pass filter to make.
The effect of demodulator 14 of the present invention is demodulation of finishing input signal.It is made up of filter selection 20, down-sampled processor 21, the saturated processing 22 of self adaptation, adaptive carrier extractor 23, frame format identifier 24, phase discriminator 25, quick time extractor 26.Fig. 2 is the embodiment electrical schematic diagram of demodulator 14 of the present invention, and by its connection line.Filter selection 20, down-sampled processor 21, the saturated processing 22 of self adaptation, adaptive carrier extractor 23, phase discriminator 25, quick time extractor 26 carry out variable Rate control by variable Rate demodulation protocol controller 8.Filter selects 20 pairs of signals from frequency overlapped-resistable filter 13 to carry out matched filtering, and signal is given down-sampled processor 21 through after the filtering.The effect of down-sampled processor 21 is that input signal is carried out down-sampled processing, gives signal self adaptation saturated processing 22 then.The effect of the saturated processing 22 of self adaptation is that signal is carried out saturated processing, gives adaptive carrier extractor 23, phase discriminator 25, quick time extractor 26 signal then.The effect of adaptive carrier extractor 23 is to extract carrier wave.The effect of time extractor 26 is to extract timing signal fast, and gives adaptive carrier extractor 23, phase discriminator 25 with timing signal.Phase discriminator 25 utilizes the two paths of signals of adaptive carrier extractor 23 and 26 inputs of quick time extractor that the output signal of the saturated processing 22 of self adaptation is carried out phase demodulation.Frame format identifier 24 carries out frame format to be differentiated, and identifies collections of letters speed type and exports to for variable Rate demodulation protocol controller 8 and carry out the demodulator front-end control, and another road exports decoder 15 to and decodes and is then exported by output signal port F.Embodiment filter selection 20, down-sampled processor 21, the saturated processing 22 of self adaptation, adaptive carrier extractor 23, frame format identifier 24, phase discriminator 25, quick time extractor 26 all adopt a field programmable gate array (FPGA) production of integrated circuits.
Power supply 30 of the present invention provides parts operating voltages at different levels, and embodiment adopts general integrated regulated power supply to make, and output+V voltage is+5V voltage.
The concise and to the point operation principle of the present invention is as follows:
Transmitting terminal encoder 1 will carry out buffer memory from the signal of input port A input, finish coding and increase frame head protection exporting modulator 2 under the control of variable Rate modulation protocol controller 6.Modulator 2 exports upconverter 3 to after baseband signal being modulated on the frequency of Low Medium Frequency after selecting suitable modulation system and information rate under the control of variable Rate modulation protocol controller 6.Upconverter 3 is exporting filter 4 under the control of variable Rate modulation protocol controller 6 after the Low Medium Frequency signal frequency conversion is on the frequency of radio frequency.Filter 4 carries out filtering with radiofrequency signal under the control of variable Rate modulation protocol controller 6, select correct radiofrequency signal, filtering image frequency signal, and strengthen the outer side-lobe signal of the band degree of roll-offing, this high-band degree of inhibition signal outward can be avoided interference to the collection of letters number.Export amplifier 5 to through the radiofrequency signal after purifying, amplifier 5 is exported by output port B after under the control of variable Rate modulation protocol controller 6 the radio frequency letter being carried out power amplification.
Receiving terminal presses down mirror filter 9 backs to carrying out filtering with outer noise and interference with the input of input port E input signal, only useful signal is carried out exporting frequency mixer 10 to after the frequency-selecting; Frequency mixer 10 exports intermediate-frequency filter 11 to after finishing the frequency-selecting of radiofrequency signal, and intermediate-frequency filter 11 exports automatic gain control amplifier 12 and wave detector 16 to after finishing the frequency spectrum shift of signal.Automatic gain control amplifier 12 exports the anti-repeatedly filter 13 that mixes to after stablizing the amplitude of down-conversion signal, 16 pairs of input signals of wave detector carry out amplitude detection, the voltage signal of reflection received signal intensity exports SNR estimator 7 to after the detection, exports variable Rate modulation protocol controller 6 after SNR estimator 7 signal to noise ratio is to received signal estimated in real time to and produces the transmission signal rate; Behind the anti-mixed repeatedly filter 13 filtering out-of-band noise components, behind the A/D unscented transformation, export demodulator 14 to, after 14 pairs of signals of demodulator carry out filtering, down-sampled and saturated processing, to low sampling rate signal extraction bit timing and carrier wave, after bit timing and carrier wave all extract, with primary signal phase demodulation demodulation together, digital signal behind the phase demodulation is carried out frame format and is differentiated, identify collection of letters speed type, carry out the control of demodulator variable Rate for variable Rate demodulation protocol controller 8, another road signal is exported to decoder 15 decoding backs and is exported by output signal F.
Mounting structure of the present invention is as follows: it is on 160 * 140 millimeters the printed panel that all circuit blocks among Fig. 1 of the present invention, Fig. 2 are installed in a block length * wide, the cable socket that is connected with external signal port A, B, C, D, E, F is installed in the printed board, then printed board being installed in a long * wide * height is in 320 * 285 * 128 millimeters the cabinet, cabinet is installed on the channel frame, the assembly cost invention.
Claims (2)
1. Meteor trail self-adapting variable-velocity burst modem, it comprises encoder (1), modulator (2), upconverter (3), filter (4), amplifier (5), variable Rate modulation protocol controller (6), SNR estimator (7), variable Rate demodulation protocol controller (8), presses down mirror filter (9), frequency mixer (10), intermediate-frequency filter (11), automatic gain control amplifier (12), frequency overlapped-resistable filter (13), decoder (15), wave detector (16), power supply (30), it is characterized in that: also comprise demodulator (14); Described encoder (1) input port 1 links to each other with input signal port A, and output port 3 links to each other with output signal port B after being connected in series modulator (2), upconverter (3), filter (4), amplifier (5) successively; Variable Rate modulation protocol controller (6) input port 1 links to each other with input signal port C, and input port 2 links to each other with SNR estimator (7) output port 2; Output port 3 to 7 links to each other with encoder (1), modulator (2), upconverter (3), filter (4), each input port 2 of amplifier (5) respectively; SNR estimator (7) input port 1 links to each other with wave detector (16) output port 1; Press down mirror filter (9) input port 1 and link to each other with input signal port E, output port 2 links to each other with output signal port F after being connected in series frequency mixer (10), intermediate-frequency filter (11), automatic gain control amplifier (12), frequency overlapped-resistable filter (13), demodulator (14), decoder (15) successively; Intermediate-frequency filter (11) output port 2 links to each other with wave detector (16) input port 2; Variable Rate demodulation protocol controller (8) input port 1 links to each other with input signal port D, and input port 2 links to each other with the output port 4 of demodulator (14), and output port 3 links to each other with the input port 3 of demodulator (14); Power supply (30) goes out the corresponding power end with each parts of end+V voltage end and connects, and each parts direct-current working volts are provided;
Described encoder (1) will carry out buffer memory and it will be carried out chnnel coding and the protection of increase frame head from the data that input port A sends here; The effect of modulator (2) exports encoder (1) input data-modulated to upconverter (3) after low-intermediate frequency; Upconverter (3) is delivered to filter (4) with modulator (2) input data-modulated behind rf frequency; Filter (4) is selected upconverter (3) input signal filtering image frequency signal correct radiofrequency signal and is exported amplifier (5) to; Amplifier (5) amplifies the power of filter (4) input signal, exports signal port B to by output port 3; Pressing down mirror filter (9) will carry out filtering from the signal that input port C sends here, export frequency mixer (10) to after noise that the filtering band is outer and the interference; Frequency mixer (10) carries out the signal of filter (9) input to export intermediate-frequency filter (11) to behind the frequency spectrum shift; Intermediate-frequency filter (11) carries out frequency mixer (10) input signal to export automatic gain control amplifier (12), wave detector (16) respectively to after the frequency-selecting; Export frequency overlapped-resistable filter (13) to behind the amplitude stabilization of automatic gain control amplifier (12) with intermediate-frequency filter (11) input signal; Frequency overlapped-resistable filter (13) exports demodulator (14) to after with automatic gain control amplifier (12) input signal filtering out-of-band noise component; Demodulator (14) carries out filtering, down-sampled and saturated processing with frequency overlapped-resistable filter (13) input signal, after extracting bit timing and carrier wave, with primary signal phase demodulation demodulation together, digital signal after the phase demodulation demodulation is carried out frame format and is differentiated, identify collection of letters speed type, export variable Rate demodulation protocol controller (8) to and carry out the demodulator front-end control; Another way word signal after demodulator (14) the phase demodulation demodulation exports decoder (15) to; Decoder (15) demodulator (14) input signal is decoded and remove redundant information after export output port F to; The frame format identification signal of data that variable Rate demodulation protocol controller (8) is sent input port D here and demodulator (14) input is converted to control signal and exports control command the demodulation of to demodulator (14) control phase demodulation by output port 3; Wave detector (16) carries out intermediate-frequency filter (11) input signal amplitude detection and exports the voltage signal that reflects received signal intensity after the detection to SNR estimator (7); SNR estimator (7) is estimated in real time the signal to noise ratio of wave detector (16) input signal and the signal to noise ratio of estimating is in real time exported to variable Rate modulation protocol controller (6), is used for auxiliary decision and sends signal rate; Variable Rate modulation protocol controller (6) is selected suitable modulation system and information rate according to the estimated value of SNR estimator (7) input, exports encoder (1), modulator (2), upconverter (3), filter (4), each input port 2 of amplifier (5) to and carries out the control of modulation system and information rate.
2. Meteor trail self-adapting variable-velocity burst modem according to claim 1 is characterized in that: demodulator (14) comprises filter selection (20), down-sampled processor (21), the saturated processor of self adaptation (22), adaptive carrier extractor (23), frame format identifier (24), phase discriminator (25), quick time extractor (26); Described filter selects (20) input 1 pin to link to each other with frequency overlapped-resistable filter (13) output port 2, and output 3 pin are connected in series going into out behind end 1,3 pin with adaptive carrier extractor (23) input 1 pin, phase discriminator (25), quick each input 2 pin of time extractor (26) and connecing of down-sampled processor (21), the saturated processor of self adaptation (22) successively; Variable Rate demodulation protocol controller (8) output port 3 is selected (20), down-sampled processor (21), the saturated processor of self adaptation (22), each input 2 pin of adaptive carrier extractor (23) and phase discriminator (25), quick each input 1 pin of time extractor (26) with filter and is connect; Adaptive carrier extractor (23) output 3 pin link to each other with phase discriminator (25) input 4 pin; Phase discriminator (25) output 5 pin and frame format identifier (24) input 1 pin, decoder (15) input port 1 also connect; Quick time extractor (26) output 3 pin and adaptive carrier extractor (23) input 4 pin, phase discriminator (25) input 3 pin also connect; Frame format identifier (24) output 2 pin link to each other with variable Rate demodulation protocol controller (8) input port 2; Each module input 9 pin goes out end+V voltage end with power supply (30) and is connected, and each input 10 pin is connected with earth terminal, and power supply provides the operating voltage of each module, and the ground end is with each module earth terminal;
Described filter selects (20) that frequency overlapped-resistable filter (13) input signal is carried out exporting down-sampled processor (21) to after the matched filtering; Down-sampled processor (21) selects (20) input signal to carry out exporting the saturated processing of self adaptation (22) to after the down-sampled processing in filter; The saturated processing of self adaptation (22) is carried out down-sampled processor (21) input signal to export adaptive carrier extractor (23), phase discriminator (25), quick time extractor (26) to after the saturated processing; Adaptive carrier extractor (23) exports phase discriminator (25) to after the saturated processing of self adaptation (22) input signal is extracted carrier wave; Time extractor (26) exports adaptive carrier extractor (23), phase discriminator (25) to after extracting the saturated processing of self adaptation (22) input signal regularly fast; Phase discriminator (25) carries out adaptive carrier extractor (23) carrier signal of extracting and the timing signal that quick time extractor (26) extracts to export frame format identifier (24) and decoder (15) to behind the phase demodulation; Frame format identifier (24) carries out frame format with phase discriminator (25) input signal and differentiates, identify collection of letters speed type and export variable Rate demodulation protocol controller (8) to and carry out the demodulator front-end control, another road output signal of phase discriminator (25) exports decoder (15) decoding back to and is exported by output signal port F.
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| CN103997392A (en) * | 2014-05-20 | 2014-08-20 | 中国科学院国家授时中心 | Meteor trail communication system self-adaptation encoding method based on TPC-RS |
| CN104660376A (en) * | 2015-03-17 | 2015-05-27 | 中国电子科技集团公司第五十四研究所 | Wireless communication device for random burst |
| CN104660375A (en) * | 2015-03-17 | 2015-05-27 | 中国电子科技集团公司第五十四研究所 | Multi-rate modulator-demodulator device based on burst communication |
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| GB0004125D0 (en) * | 2000-02-23 | 2000-04-12 | Koninkl Philips Electronics Nv | Communications system |
| CN100349447C (en) * | 2004-08-16 | 2007-11-14 | 西安电子科技大学 | Data balancing method for meteor trail communication |
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| CN105007245B (en) * | 2015-07-28 | 2018-02-23 | 上海翎沃电子科技有限公司 | A kind of method for changing Transmission system emission spectrum shape |
| CN108964625A (en) * | 2018-06-29 | 2018-12-07 | 河南中多科技发展有限公司 | The Level Control System of digital modulation and demodulation in a kind of communication of D wave |
| CN110943752A (en) * | 2019-10-17 | 2020-03-31 | 南京航空航天大学 | OQPSK self-adaptive variable rate digital transceiver based on adjacent space link protocol |
| CN110995393A (en) * | 2019-11-29 | 2020-04-10 | 中国电子科技集团公司第五十四研究所 | Meteor trail autonomous frequency-changing burst modulation-demodulation device |
| CN110996375A (en) * | 2019-12-06 | 2020-04-10 | 中国电子科技集团公司第五十四研究所 | Self-adaptive frequency selection method for meteor trail communication |
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