CN2792043Y - Adaptive frequency-selecting scatter communication modem - Google Patents
Adaptive frequency-selecting scatter communication modem Download PDFInfo
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- CN2792043Y CN2792043Y CN 200520023835 CN200520023835U CN2792043Y CN 2792043 Y CN2792043 Y CN 2792043Y CN 200520023835 CN200520023835 CN 200520023835 CN 200520023835 U CN200520023835 U CN 200520023835U CN 2792043 Y CN2792043 Y CN 2792043Y
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Abstract
The utility model discloses a self-adaptive frequency-selecting scatter communication modem, which relates to scatter communication modems using self-adaptive frequency-selecting technology in the technical field of communication. The utility model is composed of an auxiliary multiplexer-demultiplexer, a channel detector, a detection signal generator, a modem, a communication controller, a digital phase locked loop, an A/D converter, a D/A converter, a local oscillation module, a mixer, a filtering amplifier and other components. The utility model uses the self-adaptive frequency-selecting technology for enabling a scatter communication system to always work on the optimum frequency of a current channel, and the utility model has the strong performance of channel fading resistance. The utility model also has the characteristics of simplified appliance structure compared with a traditional MIMO technical structure, obviously reduced cost, small volume, light weight, reliable performance, obviously enhanced maneuvering capability, etc. The utility model is especially suitable for being used as a modem device in scatter communication systems with medium and small capacity.
Description
Technical field
The utility model relates to a kind of adaptive frequency-selecting scatter communication modulator-demodulator in the communications field, in being specially adapted to, the scatter communication system of low capacity makes modem apparatus.
Background technology
Traditional scatter communication equipment is that the rapid fading of adopting MIMO (multiple-input and multiple-output) technology to overcome channel influences.Theory and practice all proves, adopts diversity emission/reception, and the maximum ratio folding is to overcome rapid fading, the effective measures of raising signal to noise ratio.But owing to adopt the scattering equipment volume of MIMO technology huge, complex structure, so price is higher and mobility is relatively poor has caused certain difficulty for the popularization and application of scatter communication equipment.
Summary of the invention
The purpose of this utility model is to avoid the weak point in the above-mentioned background technology and provides a kind of to have the Real-time Channel Detection function and make equipment always work in adaptive frequency-selecting scatter communication modulator-demodulator on the optimum frequency of current channel, the utility model can replace baroque MIMO emission/reception technique, also eliminated the power scattering problem that the MIMO technology is brought, have higher power utilization and stronger anti-channel fading ability, and the structure of traditional scatter communication equipment is simplified greatly, cost significantly reduces, it is little that it also has a volume, in light weight, stable and reliable for performance, easy to maintenance, characteristics such as the obvious raising of maneuverability.
The purpose of this utility model is achieved in that it is by auxiliary multiplexer 1, Low Medium Frequency modulator 2, channel detector 3, detectable signal generator 4, communication controler 5, demodulator 6, auxiliary coupler 7, digital phase-locked loop 8, D/A converter 9, local oscillator module 10, frequency mixer 11, band pass filter 12, amplifier 13, intermediate frequency amplifier 14, A/D converter 15, power supply 26 is formed, wherein assist the input port 1 of multiplexer 1,2 respectively by holding wire and letter sign indicating number input port A, the symbol clock input port B links to each other, its output port 3,4,5 respectively with Low Medium Frequency modulator 2 input ports 1,2 and communication controler 5 input ports 4 link to each other; Channel detector 3 input ports 1 link to each other with communication controler 5 output ports 7, and its output port 2,3 links to each other with Low Medium Frequency modulator 2 input ports 3, demodulator 6 input ports 2 respectively; Detectable signal generator 4 input ports 1 link to each other with communication controler 5 output ports 6, and its output port 2 links to each other with D/A converter 9 input ports 1; Low Medium Frequency modulator 2 input ports 4 link to each other with communication controler 5 output ports 3, and its output port 5 and D/A converter 9 input ports 1 also connect; Digital phase-locked loop 8 input ports 1 link to each other by the steady clock C of immediate frequency cable and height port, and output port 2 links to each other with communication controler 5 input ports 5; Frequency mixer 11 input ports 1,2 link to each other with D/A converter 9 output ports 2, local oscillator module 10 output ports 1 respectively, and its output port 3 links to each other with band pass filter 12 input ports 1; Amplifier 13 input ports 1 link to each other with band pass filter 12 output ports 2, and output port 2 links to each other with the outbound port G that transmits by immediate frequency cable; Intermediate frequency amplifier 14 input ports 1 link to each other with received signal inbound port H by immediate frequency cable, and output port 2,3 links to each other with A/D converter 15 input ports 1,2 respectively; Communication controler 5 input ports 1,2,9,10 link to each other with A/D converter 15 output ports 3,4, demodulator 6 output ports 4, caller/called working method switching signal inbound port F respectively, and its output port 8 links to each other with demodulator 6 input ports 1; Demodulator 6 output ports 3,4 link to each other with auxiliary coupler 7 input ports 1,2 respectively, auxiliary coupler 7 output ports 3,4 are connected with letter sign indicating number outbound port D, symbol clock outbound port E respectively by holding wire, and power supply 26 goes out the corresponding power end with each parts of end+V voltage end and connects.
The utility model channel detector 3 is by interface and sequential control module 16, FFT processing module 17, calibration module 18, amplitude delivery module 19, data cache module 20, amplitude comparison module 21 is formed, wherein interface and sequential control module 16 inputs 1 to 12 pin link to each other with the output port 7 of communication controler 5 by 12 data lines, input 13 to 28 pin link to each other with output 1 to 16 pin of FFT processing module 17 by 16 single data buses, its output 29 to 44 pin, 45 to 60 pin pass through input 17 to 32 pin of 16 single data buses and FFT processing module 17 respectively, input 1 to 16 pin of calibration module 18 links to each other, output 63 pin link to each other with FFT processing module 17 inputs 35 pin by control line, go into to hold 65 pin to go out end+V voltage end and be connected, go into end 66 pin earth terminals with power supply; Amplitude delivery module 19 inputs 1 to 16 pin, output 17 to 32 pin link to each other with calibration module 18 outputs 17 to 32 pin, data cache module 20 inputs 1 to 16 pin by 16 single data buses respectively; Amplitude comparison module 21 inputs 1 pin links to each other with data cache module 20 outputs 20 pin, and its output 2,3 pin link to each other with the input port 2 of Low Medium Frequency modulator 2 input ports 3, demodulator 6 respectively; FFT processing module 17, calibration module 18, amplitude delivery module 19, data cache module 20, amplitude comparison module 21 each input 38 pin go out end+V voltage end with power supply 26 and are connected, and each input 39 pin is connected with earth terminal.
The utility model communication controler 5 is made up of working method handover module 22, received frame detector 23, reception timer 24, transmission timer 25, wherein working method handover module 22 inputs 1,2 pin link to each other with the output port 3,4 of A/D converter 15 by data wire respectively, input 3 pin link to each other with caller/called working method switching signal inbound port F, and output 4,5 pin link to each other with received frame detector 23 inputs 1 pin, transmission timer 25 inputs 1 pin respectively; Receive timer 24 inputs 1,2 pin and link to each other with received frame detector 23 outputs 2 pin, demodulator 6 output ports 4 respectively, output 3,4,5 pin link to each other with demodulator 6 input ports 1, channel detector 3 input ports 1, detectable signal generator 4 input ports 1 respectively; Transmission timer 25 inputs 1,2,3 pin link to each other with working method handover module 22 outputs 5 pin, auxiliary multiplexer 1 output port 5, digital phase-locked loop 8 output ports 2 respectively, and output port 4,5,6 pin link to each other with modulator 2 input ports 4, detectable signal generator 4 input ports 1, channel detector 3 input ports 1 respectively; Working method handover module 22, received frame detector 23, receive that timer 24, transmission timer 25 each input 38 pin and power supply 26 go out that end+V voltage end is connected, each input 39 pin and hold and connect.
The utility model is compared background technology and is had following advantage:
1. the utility model has adopted channel detector 3 and detectable signal generator 4, the caller station can the enterprising line period detection of a plurality of available operating frequencies in channel, and according to the called station to the testing result of detectable signal real-time select meet current demand signal most frequency as current operating frequency, not only has stronger anti fading performance, and eliminated the power scattering problem that the MIM0 technology is brought, improved the utilance of power.
2. the utility model adopts communication controler 5, has realized the automatic switchover of channel detection with the two kinds of mode of operations of communicating by letter first in the course of work of scatter communication equipment, makes communication quality that tangible improvement arranged.
3. major part of the present utility model adopts extensive field programmable device to make, and therefore can realize neatly modification to the modulator-demodulator running parameter traditional scatter communication device structure being simplified greatly by disposing different programs, and cost significantly reduces.
4. the integrated degree height of the utility model, so volume is little, in light weight, stable and reliable for performance, easy to maintenance, the equipment maneuverability is advantage such as raising obviously.
Description of drawings
Fig. 1 is the utility model functional-block diagram.
Fig. 2 is the electrical schematic diagram of the utility model channel detector 3 embodiment.
Fig. 3 is the electrical schematic diagram of the utility model communication controler 5 embodiment.
Embodiment
Referring to figs. 1 through Fig. 3, the utility model is made up of auxiliary multiplexer 1, Low Medium Frequency modulator 2, channel detector 3, detectable signal generator 4, communication controler 5, demodulator 6, auxiliary coupler 7, digital phase-locked loop 8, D/A converter 9, local oscillator module 10, frequency mixer 11, band pass filter 12, amplifier 13, intermediate frequency amplifier 14, A/D converter 15, power supply 26, Fig. 1 is an electric principle calcspar of the present utility model, and embodiment presses Fig. 1 connection line.Wherein the effect of auxiliary multiplexer 1 is the continuous letter sign indicating number that letter sign indicating number end A imports to be carried out the branch frame handle, and every frame carried out a certain proportion of time domain compression back input Low Medium Frequency modulator 2, in the time that every frame is vacated by detectable signal generator 4 under the control of communication controler 5 the transmitting channel detectable signal to D/A converter 9; At the service signal of every frame in the delivery time, 2 Low Medium Frequency signals that under the control of communication controler 5, send through ovennodulation of Low Medium Frequency modulator to D/A converter 9.The effect of Low Medium Frequency modulator 2 is: in the delivery time, the letter sign indicating number that auxiliary multiplexer 1 is sent here carries out Low Medium Frequency CHIRP-BPSK modulation at the service signal of every frame, and the signal after will modulate is imported D/A converters 9 by its port 3.Embodiment assists multiplexer 1, Low Medium Frequency modulator 2 to adopt U.S. Altema company to produce Stratix series fpga chip able to programme and makes.
The effect of the utility model channel detector 3 is Channel Detection signals of the received communication controller 5 the other side's station emission of being exported, and it is carried out spectrum analysis, thus select meet the current demand signal transmission most frequency as current operating frequency.It is made up of interface and sequential control module 16, FFT processing module 17, calibration module 18, amplitude delivery module 19, data cache module 20, amplitude comparison module 21, Fig. 2 is the electrical schematic diagram of the utility model channel detector 3, and embodiment presses Fig. 2 connection line.Wherein interface and sequential control module 16 are used to receive the Channel Detection signal from the output port 7 of communication controler 5, and carry out spectrum analysis by 17 pairs of these data of 29 to 44 foot control system FFT processing modules; The effect of FFT processing module 17 is to finish the Channel Detection signal Spectrum Analysis under the control of interface and sequential control module 16, and with testing result by its output 1 to 16 pin by data wire real-time send interface and sequential control module 16 back to; The floating data that calibration module 18 is used for that FFT processing module 17 is handled is passed through data wire input range delivery module 19 by its output 17 to 32 pin after recovering to become the fixed-point data of representing its true amplitude value; Amplitude delivery module 19 is used for that the fixed-point data that calibration module 18 is produced is carried out modulo operation and imports data cache module 20 by its output 17 to 32 pin by data wire with the mould value that obtains the channel detection signal; Data cache module 20 is used to preserve the mould value of some groups of channel detection signals, and it is carried out passing through data wire input range comparison module 21 by its output 20 pin after the statistical average; The effect of amplitude comparison module 21 is that the statistical average range value to a plurality of look-in frequencies in the channel compares, and wherein the frequency values of amplitude maximum is sent into respectively in modulator 2, the demodulator 6 by its output 2,3 pin.Embodiment interface and sequential control module 16, FFT processing module 17, calibration module 18, amplitude delivery module 19, data cache module 20, amplitude comparison module 21 adopt a U.S. Altema company to produce Stratix series fpga chip able to programme and make.
The utility model detectable signal generator 4 effect is to produce channel detection signal input D/A converter 9 under the detectable signal control that communication controler 5 outputs 6 pin are exported, and D/A converter 9 converts digital Low Medium Frequency detectable signal to behind simulation Low Medium Frequency detectable signal input mixer 11.10 effects of local oscillator module produce the mixed frequency input signal of local oscillation signal as frequency mixer 11.The effect of frequency mixer 11 is that simulation Low Medium Frequency detectable signal is mixed to intermediate frequency, again with its input tape bandpass filter 12.Band pass filter 12 carries out filtering with frequency mixer 11 output intermediate-freuqncy signals and improves input amplifier 13 behind the signal quality, and amplifier 13 amplifies filtered intermediate-freuqncy signal, by sending signal outbound port G signal is sent after reaching required output amplitude value.Embodiment detectable signal generator 4 adopts U.S. Altema company to produce Stratix Series FPGA programmable chip and makes.The AD9763 cake core that D/A converter 9 adopts U.S. A/D company to produce is made.The AD9854 cake core that local oscillator module 10 adopts U.S. A/D company to produce is made.The HSB3 frequency mixer that frequency mixer 11 adopts Chengdu Asia Optical to produce is made.The SBP-70 type band pass filter that band pass filter 12 adopts the company in sky, Chengdu to produce is made.Amplifier 13 adopts commercially available XN402 type integrated chip to make.
The effect of the utility model communication controler 5 is switching, channel detection between two kinds of operating states of control appliance calling and called and the switching between two kinds of mode of operations of communicating by letter, and the channel detection signal generation of channel detection stage and detection, the switching between the response stage.It is made up of working method handover module 22, received frame detector 23, reception timer 24, transmission timer 25, and Fig. 3 is the electrical schematic diagram of the utility model communication controler 5, and embodiment presses Fig. 3 connection line.Wherein working method handover module 22 is used under the control of caller/called working method switching signal, switches two kinds of working methods of calling and called; The effect of received frame detector 23 is the frame heads that detect under called working method in the every frame service signal that is received, and resets to receiving timer 24 immediately after receiving frame head; The effect that receives timer 24 is under the acting in conjunction of frame head reset signal and demodulation symbol clock, marks off the detectable signal detection-phase in called working method, and frequency optimum traffic is responded stage and professional demodulation stage; The effect of transmission timer 25 then is the local work clock that receives the transmit frame beginning flag of auxiliary multiplexer 1 output and digital phase-locked loop 8 outputs under the caller working method, mark off detectable signal and send the stage in the caller working method, the other side's back-signalling detection-phase and service signal send the stage.Embodiment working method handover module 22, received frame detector 23, reception timer 24, transmission timer 25 adopt a slice U.S. Altema companies to produce Stratix Series FPGA programmable chips and make.
The utility model intermediate frequency amplifier 14 input ports 1 receive the intermediate-freuqncy signal of being exported by received signal inbound port H, and the intermediate-freuqncy signal that receives is amplified the back import A/D converter 15, A/D converter 15 becomes the input port 1,2 of input communication controller 5 after the digital signal with the simulation Low Medium Frequency conversion of signals of input port 1,2, inputs to the input port 1 of channel detector 3, the input port 1 of demodulator 6 respectively by its output 7,8 again after finishing division to channel detection stage of this signal and signal demodulation stage by communication controler 5.The effect of demodulator 6 is in the signal demodulation stage of every frame signal the signal that is received from communication controler 5 to be carried out differential coherent demodulation, and the signal after the demodulation is by the auxiliary coupler 7 of its output port 3,4 inputs.The effect of auxiliary coupler 7 is that the interrupted restituted signal that demodulator 6 is imported is carried out decompression, and it is reduced to behind the continuous letter sign indicating number by output port 3 through letter sign indicating number output port D output, by its output 4 through output terminal of clock mouth E output symbol clock signal.8 effects of the utility model digital phase-locked loop are the high steady clock signals by its input port 1 receive clock input port C input, offer 5 one high steady clocks of communication controler source by its outbound port 2 after its phase-locked processing.Embodiment intermediate frequency amplifier 14 adopts commercially available XN402 type integrated amplifier to make.AD9218 type, AD6604 integrated chip that A/D converter 15 adopts U.S. A/D company to produce are made.The digital field programmable device EP1S40 that demodulator 6, auxiliary coupler 7, digital phase-locked loop 8 adopt a slice U.S. Altema company to produce makes.
The utility model power supply 26 provides the direct-current working volts of whole demodulator, and embodiment adopts commercially available general integrated constant voltage dc source piece to make, its output+V voltage for+the 3.3V supply current is 1A.
The concise and to the point operation principle of the utility model is as follows:
Under the caller working method, auxiliary multiplexer 1 will believe that the continuous letter sign indicating number that sign indicating number input port A is imported carries out the processing of branch frame, and every frame signal carried out the compression of a certain proportion of time domain so that in the time that every frame is vacated under the control of communication controler 5 transmitting channel detectable signal and detect the back-signalling of the other side's station frequency optimum traffic; Business at every frame sends the stage, then transmits modulation signals by Low Medium Frequency modulator 2 according to the frequency optimum traffic value that the other side responded on correspondent frequency.Channel detection stage and the message transmission stage in every frame signal delivered to D/A converter 9 with its output signal to the channel detection signal that Low Medium Frequency modulation signal that Low Medium Frequency modulator 2 output ports 5 are exported and detectable signal generator 4 output ports 2 are exported respectively under the control of communication controler 5, to finish of the transformation of Low Medium Frequency digital signal to the Low Medium Frequency analog signal, the local oscillation signal mixing mutually that in frequency mixer 11, produced of this signal subsequently with local oscillator module 10, finish the transformation of Low Medium Frequency analog signal to analog intermediate frequency signal again, this signal is more successively by band pass filter 12 at last, promptly send into transmission signal output part G after amplifier 13 carries out bandpass filtering and amplifies it and finish intermediate frequency moving to radio spectrum.
Under called working method, the intermediate-freuqncy signal that received signal input port H is received is converted into the digital signal of Low Medium Frequency and sends in the communication controler 5 behind intermediate frequency amplifier 14, A/D converter 15.Channel detection signal and service signal that communication controler 5 receives from the other side's station, at the detectable signal detection-phase channel detection signal is sent into channel detector 3, and when this finishes, testing result sent in the detectable signal generator 4 in stage and return to the other side's station as back-signalling; Communication controler 5 is with professional restituted signal input demodulator 6 simultaneously, and 6 current detection results according to channel detector 3 of demodulator are in the demodulation of the corresponding enterprising industry affair of frequency optimum traffic signal.Signal after the demodulation inputs to finish in the auxiliary coupler 7 and is reduced to continuous letter sign indicating number and character rate clock after tap is handled, and externally exports by letter sign indicating number outbound port D and symbol clock outbound port E respectively.
The utility model mounting structure is as follows:
It is in the printed board of 135 * 260mm that all circuit devcies among Fig. 1 to Fig. 3 are installed in two length and widths, then printed board being installed in a length is in the cabinet of 320 * 285 * 128mm, the cable socket of letter sign indicating number inbound port A, symbol clock inbound port B, high steady clock inbound port C, letter sign indicating number outbound port D, symbol clock outbound port E, working method switching signal inbound port F is installed on the front panel of cabinet, signal is installed on the plate is in the back sent out cable socket and the power input socket that port G, signal receive port H, assembling the utility model.
Claims (3)
1. adaptive frequency-selecting scatter communication modulator-demodulator, it is by auxiliary multiplexer (1), Low Medium Frequency modulator (2), detectable signal generator (4), demodulator (6), auxiliary coupler (7), digital phase-locked loop (8), D/A converter (9), local oscillator module (10), frequency mixer (11), band pass filter (12), amplifier (13), intermediate frequency amplifier (14), A/D converter (15), power supply (26) is formed, it is characterized in that: also by signal detector (3), communication controler (5) is formed, wherein assist the input port 1 of multiplexer (1), 2 respectively by holding wire and letter sign indicating number input port (A), symbol clock input port (B) links to each other, its output port 3,4,5 respectively with Low Medium Frequency modulator (2) input port 1,2 and communication controler (5) input port 4 link to each other; Channel detector (3) input port 1 links to each other with communication controler (5) output port 7, and its output port 2,3 links to each other with Low Medium Frequency modulator (2) input port 3, demodulator (6) input port 2 respectively; Detectable signal generator (4) input port 1 links to each other with communication controler (5) output port 6, and its output port 2 links to each other with D/A converter (9) input port 1; Low Medium Frequency modulator (2) input port 4 links to each other with communication controler (5) output port 3, and its output port 5 and D/A converter (9) input port 1 also connect; Digital phase-locked loop (8) input port 1 links to each other with high steady clock (C) port by immediate frequency cable, and output port 2 links to each other with communication controler (5) input port 5; Frequency mixer (11) input port 1,2 links to each other with D/A converter (9) output port 2, local oscillator module (10) output port 1 respectively, and its output port 3 links to each other with band pass filter (12) input port 1; Amplifier (13) input port 1 links to each other with band pass filter (12) output port 2, and output port 2 links to each other with the outbound port that transmits (G) by immediate frequency cable; Intermediate frequency amplifier (14) input port 1 links to each other with received signal inbound port (H) by immediate frequency cable, and output port 2,3 links to each other with A/D converter (15) input port 1,2 respectively; Communication controler (5) input port 1,2,9,10 links to each other with A/D converter (15) output port 3,4, demodulator (6) output port 4, caller/called working method switching signal inbound port (F) respectively, and its output port 8 links to each other with demodulator (6) input port 1; Demodulator (6) output port 3,4 links to each other with auxiliary coupler (7) input port 1,2 respectively, auxiliary coupler (7) output port 3,4 is connected with letter sign indicating number outbound port (D), symbol clock outbound port (E) respectively by holding wire, and power supply (26) goes out the corresponding power end with each parts of end+V voltage end and connects.
2. adaptive frequency-selecting scatter communication modulator-demodulator according to claim 1, it is characterized in that: channel detector (3) is by interface and sequential control module (16), FFT processing module (17), calibration module (18), amplitude delivery module (19), data cache module (20), amplitude comparison module (21) is formed, wherein interface and sequential control module (16) input 1 to 12 pin link to each other with the output port 7 of communication controler (5) by 12 data lines, input 13 to 28 pin link to each other with output 1 to 16 pin of FFT processing module (17) by 16 single data buses, its output 29 to 44 pin, 45 to 60 pin pass through input 17 to 32 pin of 16 single data buses and FFT processing module (17) respectively, input 1 to 16 pin of calibration module (18) links to each other, output 63 pin link to each other with FFT processing module (17) input 35 pin by control line, go into to hold 65 pin to go out end+V voltage end and be connected, go into end 66 pin earth terminals with power supply; Amplitude delivery module (19) input 1 to 16 pin, output 17 to 32 pin link to each other with calibration module (18) output 17 to 32 pin, data cache module (20) input 1 to 16 pin by 16 single data buses respectively; Amplitude comparison module (21) input 1 pin links to each other with data cache module (20) output 20 pin, and its output 2,3 pin link to each other with the input port 2 of Low Medium Frequency modulator (2) input port 3, demodulator (6) respectively; FFT processing module (17), calibration module (18), amplitude delivery module (19), data cache module (20), each input 38 pin of amplitude comparison module (21) go out end+V voltage end with power supply (26) and are connected, and each input 39 pin is connected with earth terminal.
3. adaptive frequency-selecting scatter communication modulator-demodulator according to claim 1 and 2, it is characterized in that: communication controler (5) is by working method handover module (22), received frame detector (23), receive timer (24), transmission timer (25) is formed, wherein working method handover module (22) input 1,2 pin are the output port 3 by data wire and A/D converter (15) respectively, 4 link to each other, input 3 pin link to each other output 4 with caller/called working method switching signal inbound port (F), 5 pin respectively with received frame detector (23) input 1 pin, transmission timer (25) input 1 pin links to each other; Receive timer (24) input 1,2 pin and link to each other with received frame detector (23) output 2 pin, demodulator (6) output port 4 respectively, output 3,4,5 pin link to each other with demodulator (6) input port 1, channel detector (3) input port 1, detectable signal generator (4) input port 1 respectively; Transmission timer (25) input 1,2,3 pin link to each other with working method handover module (22) output 5 pin, auxiliary multiplexer (1) output port 5, digital phase-locked loop (8) output port 2 respectively, and output port 4,5,6 pin link to each other with modulator (2) input port 4, detectable signal generator (4) input port 1, channel detector (3) input port 1 respectively; Working method handover module (22), received frame detector (23), receive that timer (24), each input 38 pin of transmission timer (25) and power supply (26) go out that end+V voltage end is connected, each input 39 pin and hold and connect.
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| CN 200520023835 CN2792043Y (en) | 2005-04-14 | 2005-04-14 | Adaptive frequency-selecting scatter communication modem |
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| CN 200520023835 CN2792043Y (en) | 2005-04-14 | 2005-04-14 | Adaptive frequency-selecting scatter communication modem |
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| CN2792043Y true CN2792043Y (en) | 2006-06-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296214B (en) * | 2008-06-25 | 2010-08-04 | 中国电子科技集团公司第五十四研究所 | Time orthogonal frequency division multiplexing modem |
| CN101359993B (en) * | 2008-08-20 | 2010-12-01 | 中国电子科技集团公司第五十四研究所 | High-speed burst modem |
| CN101437006B (en) * | 2008-11-04 | 2011-06-08 | 中国电子科技集团公司第五十四研究所 | Modem apparatus compatible with multiple systems |
| CN101641828B (en) * | 2007-03-30 | 2013-04-03 | 松下电器产业株式会社 | Mimo communication device |
| CN106027442A (en) * | 2016-05-03 | 2016-10-12 | 中国电子科技集团公司第五十四研究所 | Modem based disperse pilots |
| 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 |
-
2005
- 2005-04-14 CN CN 200520023835 patent/CN2792043Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101641828B (en) * | 2007-03-30 | 2013-04-03 | 松下电器产业株式会社 | Mimo communication device |
| CN101296214B (en) * | 2008-06-25 | 2010-08-04 | 中国电子科技集团公司第五十四研究所 | Time orthogonal frequency division multiplexing modem |
| CN101359993B (en) * | 2008-08-20 | 2010-12-01 | 中国电子科技集团公司第五十四研究所 | High-speed burst modem |
| CN101437006B (en) * | 2008-11-04 | 2011-06-08 | 中国电子科技集团公司第五十四研究所 | Modem apparatus compatible with multiple systems |
| CN106027442A (en) * | 2016-05-03 | 2016-10-12 | 中国电子科技集团公司第五十四研究所 | Modem based disperse pilots |
| CN106027442B (en) * | 2016-05-03 | 2019-05-07 | 中国电子科技集团公司第五十四研究所 | Modem based on scattered pilot |
| 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 |
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