CN103905084A - Ultra-short wave spread spectrum communication system - Google Patents
Ultra-short wave spread spectrum communication system Download PDFInfo
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- CN103905084A CN103905084A CN201410161191.XA CN201410161191A CN103905084A CN 103905084 A CN103905084 A CN 103905084A CN 201410161191 A CN201410161191 A CN 201410161191A CN 103905084 A CN103905084 A CN 103905084A
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Abstract
The invention provides an ultra-short wave spread spectrum communication system which comprises an analog radio frequency signal receiving unit, an analog radio frequency signal emitting unit, an analog signal modulation unit, an analog-digital conversion unit, a digital-analog conversion unit, a field programmable logic gate array and a high-speed real-time signal processing unit. The analog radio frequency signal receiving unit receives analog radio frequency signals, the analog signal modulation unit carries out signal modulation, the analog-digital conversion unit converts analog signals into digital signals, the field programmable logic gate array processes bottom layer signals, the high-speed real-time signal processing unit carries out upper layer communication protocol and signal processing, the digital-analog conversion unit converts digital signals into analog signals, and the analog radio frequency signal emitting unit sends the signals. The system improves system stability and anti-noise performance.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of highly reliable anti-interference fishery ultrashort wave spread spectrum communication system.
Background technology
The ultrashort wave frequency band that fishery is used is 27.5-39.5MHz, and width has 12MHz, because frequency is higher, the sky wave of transmitting generally will penetrate ionosphere zip through space, be reflected back ground and can not be ionized layer, thus mainly rely on space direct wave to propagate, only limited diffracting power.Therefore, at off-shore operation constantly, ultrashort wave radio set communication has just become comparatively rationally effectively communication mode to fishing boat.
In the application of present stage, fishery ultra short wave communication radio station is mainly take old-fashioned analog radio as main, fishing mainly adopts the mode of analog communication with ultra short wave communication equipment present stage platform, mainly comprise the compositions such as receiver high-frequency amplifier, frequency synthesizer, frequency mixer, intermediate frequency amplifier, frequency discriminator, mute control circuit, low frequency amplifier and voltage stabilizing circuit, the main method that adopts analog-modulated in modulation system.Although current equipment can meet the requirement of offshore-fishing boat communication substantially, be between fishing boat and fishing boat, to adopt ultrashort wave radio station to carry out Mare Tranquillitatis to exchange, transmit voice signal and data-signal, but due to shortcomings such as the bad and stability of the intrinsic system noise robustness of analog communication are not high, have a strong impact on the quality of communication.
Summary of the invention
The object of the present invention is to provide a kind of ultrashort wave spread spectrum communication system, to solve the problems of the technologies described above.
Supply for achieving the above object a kind of ultrashort wave spread spectrum communication system, having comprised: analog radio-frequency signal receiving element, analog radio-frequency signal transmitter unit, analog signal conditioner unit, AD conversion unit, D/A conversion unit, field programmable gate array and High speed real-time signal processing unit;
Analog radio-frequency signal receiving element receives analog radio-frequency signal, and the signal receiving is transferred to analog signal conditioner unit nurses one's health;
Analog signal conditioner unit is transferred to AD conversion unit by the signal after conditioning and is converted into digital signal;
AD conversion unit is carried out Digital Down Convert, matched filtering, synchronization acquistion and PN despreading, Walsh despreading, RS decoding by digital data transmission to field programmable gate array;
Field programmable gate array will be transferred to High speed real-time signal processing unit through the decoded signal of RS and carry out upper layer communication agreement and signal processing;
High speed real-time signal processing unit will be transferred to field programmable gate array through upper layer communication agreement and signal signal after treatment and carry out information source coding, RS coding, Walsh spread spectrum and PN pseudo random sequence spread spectrum, molding filtration, Digital Up Convert;
Programmable gate array is transferred to D/A conversion unit by signal after treatment and is changed to analog signal;
D/A conversion unit is nursed one's health analog signal transmission to analog signal conditioner unit;
Analog signal conditioner unit is transferred to analog radio-frequency signal transmitter unit by the signal after conditioning signal is sent.
Further, upper layer communication agreement and signal processing comprise processing to baseband signal upper strata complex protocol and the processing to voice signal and data-signal.
Further, analog signal conditioner unit comprises wide-band amplifier and broadband filter; Wide-band amplifier and broadband filter are for restricting signal bandwidth and improve signal amplitude.
Further, analog radio-frequency signal receiving element and analog radio-frequency signal transmitter unit are antenna;
Further, High speed real-time signal processing unit is High speed real-time signal processing device;
Further, D/A conversion unit is digital to analog converter DAC; AD conversion unit is analog to digital converter ADC.
Compared with prior art, the invention has the beneficial effects as follows:
(1) signal transmits and receives the design that has all adopted software radio, communication protocol main in system is operated in field programmable gate array and is operated, main signal work for the treatment of realizes in High speed real-time signal processing unit, reduce the quantity of analog circuit in system, the noise that front end is introduced is less, distorted signals is less, has improved the stability of system.
(2) in signal modulation and demodulation, adopted the method for spread spectrum communication, transmitting terminal adds direct sequence spread spectrum part, use the corresponding extended code of separating to carry out despreading at receiving terminal, recover initial data, aspect spread spectrum coding, employing Walsh encodes and PN pseudo random sequence is compound and the method for RS error correction coding, makes native system aspect orthogonality and error correction, have good performance, has improved the noise robustness of system.
Accompanying drawing explanation
Fig. 1 is the overall structure block diagram of ultrashort wave spread spectrum communication system of the present invention;
Fig. 2 is the workflow diagram of ultrashort wave spread spectrum communication system of the present invention;
Fig. 3 is ultrashort wave spread spectrum communication system transmission flow figure of the present invention;
Fig. 4 is that ultrashort wave spread spectrum communication system of the present invention receives flow chart.
Embodiment
Below in conjunction with each execution mode shown in the drawings, the present invention is described in detail; but should be noted that; these execution modes are not limitation of the present invention; those of ordinary skills are according to these execution mode institute work energy, method or structural equivalent transformation or alternative, within all belonging to protection scope of the present invention.
Shown in ginseng Fig. 1 to Fig. 4, Fig. 1 is the overall structure block diagram of ultrashort wave spread spectrum communication system of the present invention; Fig. 2 is the workflow diagram of ultrashort wave spread spectrum communication system of the present invention; Fig. 3 is ultrashort wave spread spectrum communication system transmission flow figure of the present invention; Fig. 4 is that ultrashort wave spread spectrum communication system of the present invention receives flow chart.
In the present embodiment, a kind of ultrashort wave spread spectrum communication system, comprising:
Analog radio-frequency signal receiving element 10, analog radio-frequency signal transmitter unit 20, analog signal conditioner unit 30, AD conversion unit 40, D/A conversion unit 50, field programmable gate array 60 and High speed real-time signal processing unit 70;
Analog radio-frequency signal receiving element 10 receives analog radio-frequency signal, and the signal receiving is transferred to analog signal conditioner unit nurses one's health 30;
Analog signal conditioner unit 30 is transferred to AD conversion unit 40 by the signal after conditioning and is converted into digital signal;
Field programmable gate array 60 will be transferred to High speed real-time signal processing unit 70 through the decoded signal of RS and carry out upper layer communication agreement and signal processing; Upper layer communication agreement and signal processing comprise processing to baseband signal upper strata complex protocol and the processing to voice signal and data-signal;
High speed real-time signal processing unit 70 will be transferred to field programmable gate array 60 through upper layer communication agreement and signal signal after treatment and carry out bottom layer signal processing, comprise information source coding, RS coding, Walsh spread spectrum and PN pseudo random sequence spread spectrum, molding filtration, Digital Up Convert;
Programmable gate array 60 is transferred to D/A conversion unit 50 by signal after treatment and is changed to analog signal;
D/A conversion unit 50 is nursed one's health analog signal transmission to analog signal conditioner unit 30;
Analog signal conditioner unit 30 is transferred to analog radio-frequency signal transmitter unit 20 by the signal after conditioning signal is sent.
In the present embodiment, analog signal conditioner unit 30 comprises wide-band amplifier and broadband filter; Wide-band amplifier and broadband filter are for restricting signal bandwidth and improve signal amplitude.
In the present embodiment, analog radio-frequency signal receiving element 10 and analog radio-frequency signal transmitter unit 20 are antenna.
In the present embodiment, High speed real-time signal processing unit 70 is High speed real-time signal processing device.
In the present embodiment, D/A conversion unit 50 is digital to analog converter DAC; AD conversion unit 40 is analog to digital converter ADC.
The workflow of the present embodiment mainly comprises the following steps:
(1) transmitting terminal carries out Walsh spread spectrum, PN spread spectrum, molding filtration and Digital Up Convert in programmable gate array (FPGA) at the scene through High speed real-time signal processing device base band symbol after treatment;
(2) field programmable gate array (FPGA) is processed signal afterwards and is converted to analog signal through digital to analog converter DAC, after modulation, sends through antenna;
(3) antenna receiving signal becomes digital signal by analog to digital converter ADC after broadband filter and wide-band amplifier, sends into field programmable gate array (FPGA) and carries out despreading processing;
(4) signal after field programmable gate array (FPGA) despreading is sent into High speed real-time signal processing device and is carried out follow-up code element and process and signal processing.
The transmitting portion of the present embodiment comprises following process:
Information source information is after information source coding, in order to improve the error correcting capability of system, need to carry out error correction coding to information source information, in multi-system spread spectrum communication, if relevant despreading result is wrong, mistake can occur together with some bit units, so the present embodiment adopts RS to encode as error correcting code.Walsh conversion can increase the data bit length of signal, and the noise immunity of signal is improved, and due to the correlation of Walsh, the signal after conversion has certain fault-tolerant ability.Therefore, the present embodiment carries out Walsh spread spectrum after RS coding, can effectively improve the noise resisting ability of system after Walsh spread spectrum.In fishery ultra short wave communication, the transmission of signal is non-synchronous transmissions, the auto-correlation function of Walsh code and cross-correlation function are all undesirable in this case, and, the Power Spectrum Distribution of each yard of sequence of Walsh code is inhomogeneous identical each other, can not independently bear spread spectrum task, therefore, the present embodiment carries out pseudorandom permutation by the pseudo noise code PN sequence of structure good relationship to data, after the randomization of PN Sequence pseudo, the characteristic of having improved correlation function, has reduced secondary lobe, has good asynchronous correlation.Before modulation, signal is also needed to carry out once-forming filtering, the frequency bandwidth taking with restricting signal, allow rear by Digital Up Convert carrier modulation, signal after modulation exports DAC to and completes the conversion of digital signal to analog signal, by analog radio frequency reflector, signal is sent to the unlimited channel in space.
The receiving unit of the present embodiment comprises following process:
, signal is moved to base band and process first by Digital Down Convert processing through the digital signal after ADC conversion, reduced signal rate simultaneously.First baseband signal after down-conversion needs by matched filter, reaches the effect that improves system signal noise ratio together with the formed filter of matched filter and transmitting terminal.Through after matched filter, this example then carries out synchronization acquistion, so that the useful letter that judgement receives, synchronization acquistion is the key point of native system, if there is no correct catching, it is all meaningless processing that follow-up despreading, decoding is processed, and native system adopts the relevant method of sliding to try to achieve correlation top, and synchronization acquistion is to effective starting point.After synchronization acquistion, first need to carry out PN despreading and remove pseudorandom permutation, then carry out Walsh and be correlated with, adjudicate to obtain RS symbol to be decoded.
The present invention, by a kind of ultrashort wave spread spectrum communication system is provided, has following beneficial effect:
(1) signal transmits and receives the design that has all adopted software radio, communication protocol main in system is operated in field programmable gate array and is operated, main signal work for the treatment of realizes in High speed real-time signal processing unit, reduce the quantity of analog circuit in system, the noise that front end is introduced is less, distorted signals is less, improve the stability of system, by revising communication protocol and the signal processing method of software in can change system, be convenient to the upgrading of system simultaneously.
(2) in signal modulation and demodulation, adopted the method for spread spectrum communication, transmitting terminal adds direct sequence spread spectrum part, use the corresponding extended code of separating to carry out despreading at receiving terminal, recover initial data, aspect spread spectrum coding, employing Walsh encodes and PN pseudo random sequence is compound and the method for RS error correction coding, makes native system aspect orthogonality and error correction, have good performance, has improved the noise robustness of system.
Listed a series of detailed description is above only illustrating for feasibility execution mode of the present invention; they are not in order to limit the scope of the invention, all do not depart from the equivalent execution mode that skill spirit of the present invention does or change and all should be included in protection scope of the present invention within.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to include in the present invention.Any Reference numeral in claim should be considered as limiting related claim.
Claims (6)
1. a ultrashort wave spread spectrum communication system, it is characterized in that, comprising: analog radio-frequency signal receiving element, analog radio-frequency signal transmitter unit, analog signal conditioner unit, AD conversion unit, D/A conversion unit, field programmable gate array and High speed real-time signal processing unit;
Described analog radio-frequency signal receiving element receives analog radio-frequency signal, and the signal receiving is transferred to described analog signal conditioner unit nurses one's health;
Described analog signal conditioner unit is transferred to described AD conversion unit by the signal after conditioning and is converted into digital signal;
Described AD conversion unit carries out Digital Down Convert, matched filtering, synchronization acquistion and PN despreading, Walsh despreading, RS decoding to described field programmable gate array described digital data transmission;
Described field programmable gate array will be transferred to described High speed real-time signal processing unit through the decoded signal of RS and carry out upper layer communication agreement and signal processing;
Described High speed real-time signal processing unit will be transferred to described field programmable gate array through upper layer communication agreement and signal signal after treatment and carry out information source coding, RS coding, Walsh spread spectrum and PN pseudo random sequence spread spectrum, molding filtration, Digital Up Convert;
Described programmable gate array is transferred to described D/A conversion unit by signal after treatment and is changed to analog signal;
Described D/A conversion unit nurses one's health described analog signal transmission to described analog signal conditioner unit;
Described analog signal conditioner unit is transferred to described analog radio-frequency signal transmitter unit by the signal after conditioning signal is sent.
2. ultrashort wave spread spectrum communication system as claimed in claim 1, is characterized in that, described upper layer communication agreement and signal processing comprise processing to baseband signal upper strata complex protocol and the processing to voice signal and data-signal.
3. ultrashort wave spread spectrum communication system as claimed in claim 2, is characterized in that, described analog signal conditioner unit comprises wide-band amplifier and broadband filter; Described wide-band amplifier and broadband filter are for restricting signal bandwidth and improve signal amplitude.
4. ultrashort wave spread spectrum communication system as claimed in claim 3, is characterized in that, described analog radio-frequency signal receiving element and analog radio-frequency signal transmitter unit are antenna.
5. ultrashort wave spread spectrum communication system as claimed in claim 4, is characterized in that, described High speed real-time signal processing unit is High speed real-time signal processing device.
6. ultrashort wave spread spectrum communication system as claimed in claim 5, is characterized in that, described D/A conversion unit is digital to analog converter DAC; Described AD conversion unit is analog to digital converter ADC.
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| CN201410161191.XA CN103905084B (en) | 2014-04-22 | 2014-04-22 | Ultrashort wave spread spectrum communication system |
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| CN201410161191.XA CN103905084B (en) | 2014-04-22 | 2014-04-22 | Ultrashort wave spread spectrum communication system |
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| CN107612522A (en) * | 2017-08-10 | 2018-01-19 | 安徽大之科技有限公司 | A kind of digital information working process service system |
| CN109425856A (en) * | 2017-09-04 | 2019-03-05 | 立积电子股份有限公司 | Signal processing system |
| CN110113751A (en) * | 2019-05-15 | 2019-08-09 | 重庆电子工程职业学院 | A kind of high confidentiality wireless communication system |
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