CN104320166A - Method for realizing greatest-distance wireless transmission between wireless transceivers - Google Patents
Method for realizing greatest-distance wireless transmission between wireless transceivers Download PDFInfo
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- CN104320166A CN104320166A CN201410459642.8A CN201410459642A CN104320166A CN 104320166 A CN104320166 A CN 104320166A CN 201410459642 A CN201410459642 A CN 201410459642A CN 104320166 A CN104320166 A CN 104320166A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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Abstract
The invention discloses a method for realizing greatest-distance wireless transmission between wireless transceivers. The transmitting frequencies of the transceivers are finely adjusted close to central frequency points, and a transmitting-receiving system automatically searches for working frequency points which are best matched with the transceivers in channels. The transmitting-receiving system automatically searches for the best-matched working frequency points through fine adjustment of the central frequency points, so that a greatest transmission distance is realized. Meanwhile, the communication distance difference among products of the same type after matching of a transmitter with a receiver can be shortened.
Description
[technical field]
The present invention relates to point to point wireless communication, particularly relate to a kind of method realizing maximum distance wireless transmission between wireless transceiver.
[background technology]
The communication effect of the different frequent points of wireless transceiver in bandwidth of operation is discrepant, and during variation of ambient temperature, wireless working frequency points can be drifted about, and operationally cannot reach best operating state.Such as, the receiving sensitivity of transceiver ic to different frequent points itself has different, and after antenna match completes, the difference due to components and parts itself causes antenna resonance frequency to have error; Due to the individual difference of components and parts, the optimum reception sensitivity place frequency between identical product Different Individual is different, and the maximum transmission power place frequency between identical product Different Individual is different; Wireless product is responsive to installation environment, and some installation environment causes antenna resonance point to offset, and affects result of use, and product is normal when dispatching from the factory test, and does not reach instructions for use in some use occasion; General crystal oscillator has the trueness error of 20ppm, and there is temperature drift, usually departs from predetermined frequency.Existing wireless product, when producing, when tranmitting frequency departs from appointment frequency, is generally the building-out capacitor changing crystal oscillator side, by adjusting the size of capacitance, adjusts tranmitting frequency, both wasting production hour, and inconvenient.
[summary of the invention]
The technical problem to be solved in the present invention is to provide one makes point to point wireless communication reach optimum Working, realizes the method for maximum distance wireless transmission between wireless transceiver.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, realize a method for maximum distance wireless transmission between wireless transceiver, the tranmitting frequency of transceiver is finely tuned near center frequency point, and receive-transmit system Automatic-searching transceiver in channel coordinates best working frequency points.
Above-described method, comprises the following steps:
201) within the scope of channel bandwidth, choose a plurality of frequency, first transceiver frequency centered by the frequency chosen sends signal one by one;
202) second transceiver Received signal strength, and record the RSSI of each Received signal strength one by one, the information of maximum for RSSI frequency is sent to first transceiver;
203) first transceiver is using the maximum frequency of RSSI as the center frequency point sending carrier wave, and first transceiver and second transceiver reach best communication work state, realizes transmission range farthest.
Above-described method, in step 201, first by the frequency range of rules and regulations, divide channel by frequency range size, define each channel bandwidth, each channel is a tentative center frequency point first, then, the center frequency point that one of them is tentative is chosen, with single channel bandwidth for scope, within the scope of this channel bandwidth, choose a plurality of described frequency, this plurality of frequency is evenly distributed in selected scope.
Above-described method, in step 201, first transceiver sends test packet with the frequency chosen one by one for launching frequency, comprises channel information in packet, before receiving second transceiver and replying, repeatedly repeats this step; In this step, transmitting frequency is changed by the parameter of change transceiver phase-locked loop.
Above-described method, in step 202., all channels of second transceiver poll, receive packet, arrange fixing receiving channels according to the channel information in packet; Second transceiver continues to receive first transceiver data and each RSSI value receiving packet of record, after arriving the time of setting, is averaged, then chooses the maximum frequency of RSSI mean value as best frequency to the RSSI value of each frequency; The information of best frequency is sent to first transceiver by second transceiver.
Above-described method, in step 203, first transceiver obtains the information of best frequency, using best frequency as the center frequency point of launching
Above-described method, the parameter of described transceiver phase-locked loop comprises: one or a plurality of in the preset division coefficient of frequency divider, 11 binary programmable counters preset division coefficients, 7 binary programmable swallow counter preset division coefficients, 14 binary programmable reference count preset division coefficients.
The method realizing maximum distance wireless transmission between wireless transceiver of the present invention makes receive-transmit system Automatic-searching coordinate best working frequency points by center frequency point fine setting, to realize transmission range farthest, reflector can be reduced simultaneously and mate communication distance difference afterwards between like product with receiver.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic diagram that embodiment of the present invention transmitter and receiver realize optimum Match.
Fig. 2 is the schematic diagram of embodiment of the present invention wireless transceiver.
[embodiment]
The method realizing maximum distance wireless transmission between wireless transceiver of the present invention makes receive-transmit system Automatic-searching coordinate best working frequency points by center frequency point fine setting, as follows with the step realizing transmission range farthest:
X frequency is chosen centered by center frequency point, No. 1 transceiver sends signal one by one to choose frequency centered by frequency, No. 2 transceiver receives signal, and record the RSSI of each Received signal strength one by one, frequency point information maximum for RSSI is sent to No. 1 transceiver, last No. 1 transceiver is using the maximum frequency of RSSI as the center frequency point sending carrier wave, and No. 1 transceiver and No. 2 transceivers reach best communication work state, realize transmission range farthest.
Wherein, 1 and No. 2 transceiver is the transceiver simultaneously with sending and receiving function; RSSI is received signal strength indicator value.
As shown in Figure 1, scheme upper 3 frequencies all in regulation allowed band, the optimum reception frequency of No. 1 receiver is 433.915MHZ, and the optimum reception frequency of No. 2 machine receivers is at 433.925MHZ; Transmitter and No. 1 receiver with the use of time best transmitting frequency be 433.915MHZ, with No. 2 receivers with the use of time best transmitting frequency be 433.925MHZ; Use above-described embodiment center frequency point method for trimming, when same reflector coordinates with No. 1 receiver, working frequency points is 433.915MHZ, and when coordinating with No. 2 receivers, working frequency points moves on to 433.925MHZ automatically; Wireless system is at any time made all to be operated in best effort frequency.
The concrete steps realizing this method are as follows:
1, in the frequency range of rules and regulations, divide channel, define each channel bandwidth by frequency range size, each channel is a tentative center frequency point first.
2, choose one of them center frequency point, with single channel bandwidth for scope, choose X frequency within the scope of this channel bandwidth, this X frequency is evenly distributed in selected scope; (may have multiple channel in a frequency range, what this method was paid close attention to is frequency trim in single channel, and scope is generally no more than 0.5MHZ).
3, after No. 1 transceiver start, sending test packet (comprising channel information in packet) with X frequency of choosing above one by one for launching frequency, before receiving No. 2 transceivers and replying, repeatedly repeating this step; In this step, by changing M, N, A, R parameter of phase-locked loop, transmitting frequency is changed;
4, after No. 2 transceiver starts, all channels of poll, receive packet, arrange fixing receiving channels according to the channel information in packet.
5, No. 2 transceivers continue reception No. 1 Transceiver Data bag and each RSSI value receiving packet of record, after receiving a period of time, be averaged, then choose the frequency Y that RSSI mean value is maximum to the RSSI value of each frequency.
6, No. 2 transceivers send to No. 1 transceiver frequency Y information;
7, No. 1 transceiver is using frequency Y as the center frequency point of launching, and now during No. 1 Transceiver Transmit, the signal strength signal intensity that No. 2 transceivers receive is maximum.
8, due to transmitting, reception shared VCO, the antenna of transceiver, when transmitting reaches optimum state, receive and also reach optimum state simultaneously, now receive-transmit system all reaches optimum Match state.
As shown in Figure 2, this wireless system working frequency points is decided by f vco to the principle of embodiment of the present invention wireless transceiver:
f?vco＝【(M?X?N)+A】X?fosc÷R
(A<N)
Wherein:
F vco: voltage controlled oscillator operating frequency;
Fosc: crystal oscillator operating frequency, determined by crystal oscillator X1 self-oscillation frequency, electric capacity C1 and C2 can finely tune crystal oscillator frequency;
M: the preset division coefficient (optional 64 or 128) of frequency divider;
N:11 position binary programmable counters preset division coefficient (span 5 to 2047);
A:7 position binary programmable swallow counter preset division coefficient (span 0 to 127)
R:14 position binary programmable reference count preset division coefficient (span 5 to 16383).
When system is in emission state, f vco is systems radiate frequency; When system is in accepting state, f vco is exactly system local frequency.
As can be seen from f vco computing formula, when needing change frequency, there are 2 kinds of modes:
The first is change hardware, and adjustment crystal oscillator X1, C1 and C2, change fosc, thus change f vco.
The second is one or more by M, N, A, R parameter of software change phase-locked loop, thus changes f vco.
The above embodiment of the present invention adopts the second way to change frequency.
In traditional wireless product design, main concern reflector and receiver technical indicator separately; The above embodiment of the present invention mainly pays close attention to dynamic indicator during whole receive-transmit system cooperating, product is when matching use, Automatic-searching best effort frequency, there is intellectuality, exempt from debug function, to realize transmission range farthest, reduction reflector mates the communication distance difference between rear like product with receiver simultaneously.
Claims (7)
1. realize a method for maximum distance wireless transmission between wireless transceiver, it is characterized in that, the tranmitting frequency of transceiver is finely tuned near center frequency point, and receive-transmit system Automatic-searching transceiver in channel coordinates best working frequency points.
2. method according to claim 1, is characterized in that, comprises the following steps:
201) within the scope of channel bandwidth, choose a plurality of frequency, first transceiver frequency centered by the frequency chosen sends signal one by one;
202) second transceiver Received signal strength, and record the RSSI of each Received signal strength one by one, the information of maximum for RSSI frequency is sent to first transceiver;
203) first transceiver is using the maximum frequency of RSSI as the center frequency point sending carrier wave, and first transceiver and second transceiver reach best communication work state, realizes transmission range farthest.
3. method according to claim 2, it is characterized in that, in step 201, first by the frequency range of rules and regulations, channel is divided by frequency range size, define each channel bandwidth, each channel is a tentative center frequency point first, then, choose the center frequency point that one of them is tentative, with single channel bandwidth for scope, within the scope of this channel bandwidth, choose a plurality of described frequency, this plurality of frequency is evenly distributed in selected scope.
4. method according to claim 3, is characterized in that, in step 201, first transceiver sends test packet with the frequency chosen one by one for launching frequency, comprise channel information in packet, before receiving second transceiver and replying, repeatedly repeat this step; In this step, transmitting frequency is changed by the parameter of change transceiver phase-locked loop.
5. method according to claim 4, is characterized in that, in step 202., all channels of second transceiver poll, receive packet, arrange fixing receiving channels according to the channel information in packet; Second transceiver continues to receive first transceiver data and each RSSI value receiving packet of record, after arriving the time of setting, is averaged, then chooses the maximum frequency of RSSI mean value as best frequency to the RSSI value of each frequency; The information of best frequency is sent to first transceiver by second transceiver.
6. method according to claim 5, is characterized in that, in step 203, first transceiver obtains the information of best frequency, using best frequency as the center frequency point of launching.
7. method according to claim 4, it is characterized in that, the parameter of described transceiver phase-locked loop comprises: one or a plurality of in the preset division coefficient of frequency divider, 11 binary programmable counters preset division coefficients, 7 binary programmable swallow counter preset division coefficients, 14 binary programmable reference count preset division coefficients.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106443575A (en) * | 2016-06-29 | 2017-02-22 | 西藏舟航物联科技有限公司 | Positioning method, positioner, radio frequency positioning device, and positioning system |
| CN107787038A (en) * | 2016-08-26 | 2018-03-09 | 山东数智体育科技股份有限公司 | A kind of method of frequency correction |
| CN113259030A (en) * | 2021-05-19 | 2021-08-13 | 扬州万方电子技术有限责任公司 | Wireless network communication system and method based on RSSI (received Signal Strength indicator) |
| CN115242330A (en) * | 2022-07-20 | 2022-10-25 | 昆腾微电子股份有限公司 | Connection method and device of ultrahigh frequency wireless sound box, wireless sound box and medium |
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| CN101883411A (en) * | 2010-05-27 | 2010-11-10 | 复旦大学 | Rapid frequency scanning method and device for initial cell search |
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| US8521097B1 (en) * | 2003-12-23 | 2013-08-27 | Cypress Semiconductor Corporation | Method and apparatus for tuning a radio receiver with a radio transmitter |
| CN1674701A (en) * | 2004-03-26 | 2005-09-28 | 明基电通股份有限公司 | Method for receiving free wireless public broadcast services with a mobile station |
| CN101102121A (en) * | 2007-06-14 | 2008-01-09 | 重庆重邮信科（集团）股份有限公司 | Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106443575A (en) * | 2016-06-29 | 2017-02-22 | 西藏舟航物联科技有限公司 | Positioning method, positioner, radio frequency positioning device, and positioning system |
| CN107787038A (en) * | 2016-08-26 | 2018-03-09 | 山东数智体育科技股份有限公司 | A kind of method of frequency correction |
| CN113259030A (en) * | 2021-05-19 | 2021-08-13 | 扬州万方电子技术有限责任公司 | Wireless network communication system and method based on RSSI (received Signal Strength indicator) |
| CN113259030B (en) * | 2021-05-19 | 2023-11-17 | 扬州万方电子技术有限责任公司 | Frequency self-adaption method based on RSSI wireless network communication system |
| CN115242330A (en) * | 2022-07-20 | 2022-10-25 | 昆腾微电子股份有限公司 | Connection method and device of ultrahigh frequency wireless sound box, wireless sound box and medium |
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Address after: 518000 fourth buildings and fifth first floor of Wan Dai Heng Guangming hi tech Industrial Park, Guangming New District, Shenzhen, Guangdong. Patentee after: Shenzhen Haoen Safety Technology Co., Ltd. Address before: 518000 fourth buildings and fifth first floor of Wan Dai Heng Guangming hi tech Industrial Park, Guangming New District, Shenzhen, Guangdong. Patentee before: Zhong An (Shenzhen) Co., Ltd. |