CN102255630A - Wireless fidelity (WiFi) frequency hopping remote transmission module - Google Patents
Wireless fidelity (WiFi) frequency hopping remote transmission module Download PDFInfo
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- CN102255630A CN102255630A CN2011100075254A CN201110007525A CN102255630A CN 102255630 A CN102255630 A CN 102255630A CN 2011100075254 A CN2011100075254 A CN 2011100075254A CN 201110007525 A CN201110007525 A CN 201110007525A CN 102255630 A CN102255630 A CN 102255630A
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Abstract
The invention discloses a wireless fidelity (WiFi) frequency hopping remote transmission module, which comprises an antenna, a transceiver switch, a WiFi chip, a frequency hopping transmission channel and a frequency chopping receiving channel. The frequency hopping transmission channel comprises a transmission mixer, a band-pass filter and a power amplifier which are sequentially connected, and further comprises a transmitter frequency hopping code generator and a transmission frequency synthesizer which serves as a transmission mixer local oscillation source, wherein the signal output end of the transmitter frequency hopping code generator is connected with the transmission frequency synthesizer. The frequency hopping receiving channel comprises a low-noise amplifier, a receiving mixer and the band-pass filter which are sequentially connected, and further comprises a receiver frequency hopping code generator and a receiving frequency synthesizer which serves as a receiving mixer local oscillation source, wherein the signal output end of the receiver frequency hopping code generator is connected with the receiving frequency synthesizer. The WiFi frequency hopping remote transmission module greatly improves the security and confidentiality of communication, ensures high confidentiality and high communication quality, and is difficult to interfere.
Description
Technical field
The present invention relates to the long-distance transmissions module of a kind of AP of being used for access point or wireless user terminal, relate in particular to the long-distance transmissions module that a kind of WiFi frequency hopping is used.
Background technology
(Wireless Fidelity, adopting wireless fidelity technology) be a kind of with PC, handheld device terminals such as (as mobile phone, PDA) with the interconnected technology of wireless mode.Compare with being connected of conventional cable network, WiFi is with the radio wave transmissions data, broken original safety supposition based on physical layer, safety problem becomes its maximum weakness, the assailant can start to attack and invasion at a distance, attack the position and also be difficult to determine, also be easy to escape even be found.The coverage of WiFi access node is more and more wider in addition, density is increasing, and AP information can obtain at an easy rate, and the assailant can make things convenient for, attack easily, randomly these unsafe AP, increased the disguise of attacking, so WiFi is the easiest a kind of platform under attack.
For using maximum WiFi technology, following deficiency is arranged based on the IEEE802.11a/b/g/n standard: the one, be subjected to network attack easily; The 2nd, poor anti jamming capability.802.11b though the direct sequence spread spectrum that is adopted also has antijamming capability, but thisly anti-interferencely obtain processing gain by relevant despreading and reach jamproof purpose, but the frequency of deciding that has surpassed jamming margin disturbs the communication disruption or the performance rapid deterioration that will cause directly-enlarging system.These shortcomings have limited the practicality of WiFi greatly.
Summary of the invention
The present invention seeks to: at the deficiencies in the prior art, the WiFi long-distance transmissions module that provides a kind of frequency hopping to use improves security of communication system and confidentiality, promotes communication quality.
Technical scheme of the present invention is: by the continuous channel that changes emission, received signal in the WiFi system, make frequency constantly saltus step along with the variation of time of emission, received signal, and the frequency of saltus step determines according to pseudo noise code.WiFi frequency hopping long-distance transmissions module comprises antenna, transmit-receive switch and WiFi chip, also comprises frequency hopping transmission channel and frequency hopping receive path; The frequency hopping transmission channel comprises transmitting mixer, band pass filter and the power amplifier that connects successively, also comprise transmitting terminal frequency hopping code maker and as the tranmitting frequency synthesizer of transmitting mixer local vibration source, the signal output part of described transmitting terminal frequency hopping code maker connects the tranmitting frequency synthesizer; Described frequency hopping receive path comprises successively low noise amplifier, receiving mixer, the band pass filter that connects, and also comprises receiving terminal frequency hopping code maker and as the receive frequency synthesizer of receiving mixer local vibration source; The signal output part of receiving terminal frequency hopping code maker connects the receive frequency synthesizer.
Further, in the described WiFi frequency hopping long-distance transmissions module, described transmitting terminal frequency hopping code maker generates the pseudo noise code of the carrier frequency that is used for controlling the tranmitting frequency synthesizer.
Further, in the described WiFi frequency hopping long-distance transmissions module, described frequency hopping receive path also comprises the synchronous circuit of the accurate phase place of the Frequency Hopping Signal of catching reception; Described receiving terminal frequency hopping code maker is according to the phase information of the Frequency Hopping Signal that receives, obtain with the WiFi frequency hopping long-distance transmissions module of launching this frequency hopping WiFi signal in the consistent pseudo noise code that generates of transmitting terminal frequency hopping code maker.
Advantage of the present invention is: adopt the fail safe and the confidentiality of the communication of the WiFi frequency hopping long-distance transmissions module after this frequency hopping mode to be greatly improved, be difficult for disturbed, the high communication quality.With the saltus step of the control communication frequency of pseudo noise code, the saltus step rule is very complicated, makes the enemy be hard to know our frequency hopping rule, has improved the confidentiality of WiFi broadband connections greatly.And strong decide frequency and disturb and to interfere with all WiFi frequency hopping frequencies, therefore strong decide frequency and disturb system of the present invention is not had much affect.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the WiFi frequency hopping long-distance transmissions modular structure sketch of present embodiment.
Wherein: 1 frequency hopping transmission channel; 11 transmitting mixers; 12 band pass filters; 13 power amplifiers; 14 tranmitting frequency synthesizers; 15 transmitting terminal frequency hopping code makers; 2 frequency hopping receive paths; 21 band pass filters; 22 receiving mixers; 23 low noise amplifiers; 24 receive frequency synthesizers; 25 receiving terminal frequency hopping code makers; 3 transmit-receive switches; 4 WiFi chips.
Embodiment
Embodiment:, make frequency constantly saltus step of emission, received signal, and the order of saltus step determines according to pseudo noise code along with the variation of time by the continuous channel that changes emission, received signal in the WiFi system.In frequency-hopping communication system, in order to realize that carrier frequency is the communication of saltus step, require the frequency in the mixing source of frequency mixer in frequency hopping receive path 2 and the frequency hopping transmission channel 1 to change according to the rule that pre-establishes, this device that can produce frequency-hopping carrier is referred to as frequency hopper.Frequency hopper is made of frequency synthesizer and frequency hopping code maker, and the frequency hopping code maker generates pseudo noise code control frequency synthesizer outgoing carrier signal frequency.Frequency hopping transmission channel 1 will have frequency-hopping carrier frequency mixing that WiFi chip signal output and frequency synthesizer generate now becomes transmitting by the different frequency of pseudo noise code rule saltus step.Receiving terminal is obtaining after the frequency hopping rule information signal to be separated jumping, is reduced into original WiFi signal input WiFi chip.
In frequency hopping transmission channel 1, in transmitting terminal frequency hopping code maker 15, generate pseudo noise code, control the carrier frequency that tranmitting frequency synthesizer 14 generates with pseudo noise code, carrier frequency is changed according to certain rules.The frequency-hopping carrier frequency that WiFi chip 4 output WiFi signals and tranmitting frequency synthesizer 15 generate is carried out mixing in transmitting mixer 11, become transmitting by the different frequency of pseudo noise code rule saltus step, amplify through entering power amplifier 13 behind the band pass filter 12, go out by antenna transmission through transmit-receive switch 3 again.
In frequency hopping receive path 2, the frequency hopping WiFi signal that antenna receives enters receiving mixer through low noise amplifier 23.Capture the accurate phase place of the Frequency Hopping Signal that sends by synchronous circuit, make receiving terminal frequency hopping code maker 25 generate consistent local pseudo noise code in the frequency hopping transmission channel with the WiFi frequency hopping long-distance transmissions module of launching this frequency hopping WiFi signal, and control receive frequency synthesizer 24 generates the identical local frequency signal that generates with the tranmitting frequency synthesizer of the WiFi frequency hopping long-distance transmissions module of launching this frequency hopping WiFi signal, in receiving mixer, the local oscillation signal of frequency hopping carries out mixing to the frequency hopping WiFi signal that receives, signal is reduced into original WiFi signal, handles through entering the WiFi chip after the band-pass filter.
Receiving terminal frequency hopping code maker and transmitting terminal frequency hopping code maker keep synchronously, i.e. the pseudo noise code of receiving terminal frequency hopping code maker generation is consistent with the pseudo noise code that the transmitting terminal frequency hopping code generates.Synchronous mode can adopt self-synchronizing method, also claim the synch information extraction method, this method is the synchronizing information that implies in the digital information sequence that utilizes sendaisle to send, and realizes frequency hopping communications thereby in the frequency hopping receive path it is extracted the acquisition synchronizing information.
Because the rule that very noisy in the channel and interference signal are not known frequency hopping is so after receiving terminal carried out mixing, they can't appear in the intermediate-freuqncy signal of fixed frequency range, so played jamproof effect.In order to increase transmission range, adopt high power amplifier 13 to improve transmitting power at transmitting terminal, receiving terminal adopts low noise amplifier 23 to increase receiving sensitivity.
The above only is the preferred embodiments of the present invention, can not limit scope of the invention process with this, and all simple conversion of doing according to claim of the present invention and description all should still belong to the protection range that the present invention covers.
Claims (3)
1. a WiFi frequency hopping long-distance transmissions module comprises antenna, transmit-receive switch (3) and WiFi chip (4), it is characterized in that: also comprise frequency hopping transmission channel (1) and frequency hopping receive path (2); Described frequency hopping transmission channel (1) comprises transmitting mixer (11), band pass filter (12) and the power amplifier (13) that connects successively, also comprise transmitting terminal frequency hopping code maker (15) and as the tranmitting frequency synthesizer (14) of transmitting mixer local vibration source, the signal output part of described transmitting terminal frequency hopping code maker (15) connects tranmitting frequency synthesizer (14); Described frequency hopping receive path (2) comprises successively low noise amplifier (23), receiving mixer (22), the band pass filter (21) that connects, and also comprises receiving terminal frequency hopping code maker (25) and as the receive frequency synthesizer (24) in receiving mixer mixing source; The signal output part of receiving terminal frequency hopping code maker (25) connects receive frequency synthesizer (24).
2. according to a kind of WiFi frequency hopping long-distance transmissions module described in the claim 1, it is characterized in that: described transmitting terminal frequency hopping code maker (15) generates the pseudo noise code of the carrier frequency be used for controlling tranmitting frequency synthesizer (14).
3. according to a kind of WiFi frequency hopping long-distance transmissions module described in the claim 1, it is characterized in that: described frequency hopping receive path (2) also comprises the synchronous circuit of the accurate phase place of Frequency Hopping Signal of catching reception; Described receiving terminal frequency hopping code maker (25) is according to the phase information of the Frequency Hopping Signal that receives, obtain with the WiFi frequency hopping long-distance transmissions module of launching this frequency hopping WiFi signal in the consistent pseudo noise code that generates of transmitting terminal frequency hopping code maker (15).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517458A (en) * | 2013-09-29 | 2014-01-15 | 苏州华士无线科技有限公司 | WIFI long-distance transmission module with double-direction frequency conversion technology |
| CN104485978A (en) * | 2014-12-31 | 2015-04-01 | 四川师范大学 | Frequency-hopping type WIFI system |
| CN107465463A (en) * | 2017-09-18 | 2017-12-12 | 贵州航天天马机电科技有限公司 | A kind of means for anti-jamming and method |
| CN106209163B (en) * | 2016-06-21 | 2018-06-08 | 中国科学院半导体研究所 | Frequency-hopping communication system based on microwave communication and spacing wireless optic communication dual link |
| CN109617564A (en) * | 2018-12-06 | 2019-04-12 | 湖南金翎箭信息技术有限公司 | A kind of high quality, fast frequency-hopped TDD wireless transceiver system |
| CN110351730A (en) * | 2019-06-24 | 2019-10-18 | 惠州Tcl移动通信有限公司 | Mobile terminal WIFI processing method, mobile terminal and storage medium |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517458A (en) * | 2013-09-29 | 2014-01-15 | 苏州华士无线科技有限公司 | WIFI long-distance transmission module with double-direction frequency conversion technology |
| CN103517458B (en) * | 2013-09-29 | 2017-04-12 | 苏州华士无线科技有限公司 | WIFI long-distance transmission module with double-direction frequency conversion technology |
| CN104485978A (en) * | 2014-12-31 | 2015-04-01 | 四川师范大学 | Frequency-hopping type WIFI system |
| CN106209163B (en) * | 2016-06-21 | 2018-06-08 | 中国科学院半导体研究所 | Frequency-hopping communication system based on microwave communication and spacing wireless optic communication dual link |
| CN107465463A (en) * | 2017-09-18 | 2017-12-12 | 贵州航天天马机电科技有限公司 | A kind of means for anti-jamming and method |
| CN109617564A (en) * | 2018-12-06 | 2019-04-12 | 湖南金翎箭信息技术有限公司 | A kind of high quality, fast frequency-hopped TDD wireless transceiver system |
| CN110351730A (en) * | 2019-06-24 | 2019-10-18 | 惠州Tcl移动通信有限公司 | Mobile terminal WIFI processing method, mobile terminal and storage medium |
| CN110351730B (en) * | 2019-06-24 | 2023-12-15 | 惠州Tcl移动通信有限公司 | WIFI processing method for mobile terminal, mobile terminal and storage medium |
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Application publication date: 20111123 |