CN101202531A - Temperature compensation method, apparatus and access point - Google Patents
Temperature compensation method, apparatus and access point Download PDFInfo
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- CN101202531A CN101202531A CNA2007101245044A CN200710124504A CN101202531A CN 101202531 A CN101202531 A CN 101202531A CN A2007101245044 A CNA2007101245044 A CN A2007101245044A CN 200710124504 A CN200710124504 A CN 200710124504A CN 101202531 A CN101202531 A CN 101202531A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
- H03L1/026—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature by using a memory for digitally storing correction values
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention discloses a method, a device and an access point for temperature compensation. The temperature compensation method comprises the steps of obtaining the temperature of an adjustable clock device and corresponding regulation signals, updating the temperature and regulation signal corresponding table which are established in advance by the temperature and the regulation signals according to an arranged updating mechanism, and transferring the corresponding table to carry out the temperature compensation to the adjustable clock device. The temperature compensation is carried out by the soft and hard combination type of obtaining the temperature of the adjustable clock device and updating the temperature and the modulation signal corresponding table; the invention obtains high temperature compensation precision with low cost, overcomes the parameter batch effect of devices and the effect of the aging of devices, reduces the stability requirement of reference clock source, shortens the clock stabilization time when starting and improves the haleness of communication system.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to method, device and the access point of temperature-compensating.
Background technology
In moving communicating field, the precision of clock synchronization is had relatively high expectations, can comprise two clocks in the mobile communication system usually: system clock is reference clock source, local clock, and the two need reach synchronous.System clock is that local clock is the clock that the local clock device is produced by the clock of public network transmission.Usually can be at receiving terminal by phase-locked elimination of the software of system clock and local clock transmitted the clock delay that brings.But the phase-locked general dozens of minutes of software, several hrs even a few talent can adjust once, can only guarantee the long-time stability of local clock system.In the phase-locked interval of software, the instability of local clock may lead to system abnormity, and loses communication continuity.And the short-term stability of local clock depends primarily on the self-characteristic of local clock device.
The clock devices of extensive use now is adjustable clock devices.What VCXO was VCXO (VoltageControl Crystal Oscillator) in the adjustable clock devices is a kind of, and its output frequency and voltage-controlled voltage have relatively-stationary proportionate relationship.
Generally the result of reference clock source and local clock comparison is regulated voltage-controlled voltage in actual applications, make the output frequency of crystal oscillator and reference clock source reach synchronous fully, keep the long-time stability of local clock according to phase-locked loop.But except that voltage-controlled voltage, the output frequency of VCXO also is subjected to the influence of many other factors, as temperature, load, aging, vibration, gravity etc., wherein temperature having the greatest impact to output frequency.If frequency offset correction without temperature-compensating, the temperature drift meeting of general crystal oscillator brings the frequency shift (FS) of dozens or even hundreds of pmm (1,000,000/), the frequency shift (FS) meeting of this degree has a strong impact on the short-term stability of local clock, and it is unacceptable for some frequency stabilization being had the synchronized clock system of being strict with.Therefore, carrying out temperature-compensating is necessary to improve frequency accuracy.Usually, the method for carrying out temperature-compensating has two kinds:
1. crystal oscillator itself is carried out temperature-compensating.It is TCXO (Temperature Compensated Crystal Oscillator) that the typical case of this type of device is represented as temperature compensating crystal oscillator.Such crystal oscillator is Duoed a temperature sensing device (as thermistor) textural than common crystals, and structural representation as shown in Figure 1.The correction voltage that utilizes this temperature sensing device to produce is regulated the reactance of variable capacitance diode in the crystal network, reaches the purpose of compensated crystal frequency-temperature characteristic.The compensating circuit of this method is not to adjust separately at each crystal, is subject to the influence of fluctuations of device parameters batch property, generally can accomplish the temperature compensate of frequency deviation of positive and negative 2ppm, can provide about 20 times improvement in the temperature variant scope of the frequency of crystal.
2. generation isoperibol.It is OCXO (Oven ControlCrystal Oscillator) that the typical case of this type of device is represented as constant-temperature crystal oscillator.Such device is Duoed a thermostat textural than common crystals, and crystal and other temperature-sensing element (device)s all are contained in this thermostat, and thermostat is adjusted to frequency to the insensitive zero temperature coefficient point of variations in temperature, and its structural representation as shown in Figure 2.This method is owing to increased thermostat and control circuit thereof, and cost is very high, and power consumption is bigger, needs 600mA when generally starting, and needs 250mA during operate as normal, can improve more than 1000 times in the temperature variant scope of the frequency of crystal.
In realizing process of the present invention, by the research to crystal oscillator and voltage controlled oscillator VCO isochronon device, the inventor finds that there is following problem at least in above-mentioned prior art:
1. utilize the temperature compensation clock devices to carry out the method for temperature-compensating, compensating circuit is not to adjust at each clock devices, and the different crystal oscillator characteristics after the compensation differ greatly; Compensation precision is lower, generally can only accomplish the temperature frequency deviation of positive and negative 2ppm, if will compensate out the crystal oscillator of 3 grades of clock indexs, cost is higher, and still can not satisfy for the application that the clock accuracy requirement is higher than 3 grades of clocks; How to compensate, be subject to the influence of fluctuations of device parameters batch property with discrete device.
2. utilize the constant temperature clock devices to carry out the method for temperature-compensating, owing to increased thermostat and control circuit, cost is very high; For guaranteeing that the OCXO temperature constant needs thermostat is heated continuously, power consumption is bigger, needs 600mA when generally starting, and needs 250mA during operate as normal; And because the constant temperature clock devices is controlled at zero temperature coefficient point to temperature, if ambient temperature is higher than this temperature, thermostat just can't keep the temperature of clock devices, can only heat up and can't lower the temperature, and this moment, the temperature/frequency curve of clock devices can rapid deterioration.
3. above two kinds of temperature-compensatings of the prior art are all determined when dispatching from the factory detection, so can not overcome the frequency deviation influence that the clock devices long-term ageing brings.
Summary of the invention
Embodiment of the invention technical problem to be solved is to provide method, device and the access point of temperature-compensating, carry out the temperature-compensating of adjustable clock devices frequency offset correction with lower cost, improve the precision of local clock, improved the short-term stability of local clock and the robustness of communication system.
The embodiment of the invention provides a kind of method of temperature-compensating, comprises the steps:
Obtain the temperature and the corresponding adjustment signal of adjustable clock devices;
Utilize described temperature and adjustment signal that temperature and the adjustment signal correspondence table set up are in advance upgraded according to the update mechanism of setting;
Call described correspondence table described adjustable clock devices is carried out temperature-compensating.
The embodiment of the invention also provides a kind of device of temperature-compensating, comprising:
Temperature sensor is used to obtain the temperature of adjustable clock devices;
Synchronizer is used to obtain the adjustment signal of adjustable clock devices;
Memory is used for storing temperature and adjustment signal correspondence table;
Controller is used to utilize described temperature and described adjustment signal that described temperature and adjustment signal correspondence table are upgraded, and calls described temperature and the adjustment signal correspondence table is carried out temperature-compensating to described adjustable clock devices.
The embodiment of the invention also provides a kind of temperature compensation adjustable clock devices device, comprising:
Adjustable clock devices is used to produce local clock, and according to adjustment signal, output is through the local clock of overcorrect;
Temperature sensor is used to obtain the temperature of adjustable clock devices;
Synchronizer is used to obtain the adjustment signal of adjustable clock devices;
Memory is used for storing temperature and adjustment signal correspondence table;
Controller is used to utilize described temperature and described adjustment signal that described temperature and adjustment signal correspondence table are upgraded, and calls described temperature and the adjustment signal correspondence table is carried out temperature-compensating to described adjustable clock devices.
The embodiment of the invention also provides a kind of access point AP that comprises the adjustable clock devices device of temperature compensation, comprising:
Clock module comprises the adjustable clock devices device of temperature compensation, is used for the clock generation circuit that comprises temperature compensation means by this, provides system required high precision clock;
Main control module is used to finish master control function, comprises that Operation and Maintenance, alarm detection report etc.;
Algorithm processing module is used to the base band signal process that realizes that radio communication is required, includes but not limited to processing such as demodulation, access, coding, decoding;
Radio-frequency module is used to realize that baseband signal arrives the mutual conversion of radio frequency signal;
Power module is used to system to provide operate as normal required power supply.
Compare with prior art, embodiment provided by the invention has following beneficial effect:
The method of the temperature-compensating that the embodiment of the invention provides, device and access point, with the mode of the soft or hard combination of the correspondence table of upgrading corresponding temperature and adjustment signal adjustable clock devices is carried out temperature-compensating by the temperature of obtaining adjustable clock devices, obtain higher temperature-compensating precision with lower cost, and can overcome the influence that device parameters batch property influence and device aging bring, reduced stability requirement to reference clock source, clock stabilization time when having shortened start, guarantee the stability of local clock when the temperature acute variation, improved the robustness of communication system.
Description of drawings
Fig. 1 is the structural representation of temperature compensating crystal oscillator in the prior art;
Fig. 2 is the structural representation of constant-temperature crystal oscillator in the prior art;
Fig. 3 is the schematic flow sheet of temperature compensation in one embodiment of the invention;
Fig. 4 is the structural representation of temperature compensation means in another embodiment of the present invention;
Fig. 5 is the structural representation of the adjustable clock devices device of temperature compensation in another embodiment of the present invention;
Fig. 6 is the structural representation of temperature compensation VCXO device in another embodiment of the present invention;
Fig. 7 is for comprising the structural representation of the access point AP of the adjustable clock devices device of temperature compensation in another embodiment of the present invention.
Embodiment
The embodiment of the invention is carried out temperature-compensating by the mode that hardware and software combines, and has obtained the local clock of degree of precision with lower cost.For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
The method of temperature-compensating in the embodiment of the invention as shown in Figure 3, comprises the steps:
S301, the temperature of obtaining adjustable clock devices and adjustment signal;
In communication system, the adjustment signal of adjustable clock devices obtains by the acting in conjunction of reference clock source and synchronization mechanism usually; Reference clock source obtains from the base station by downlink command usually; Synchronization mechanism can be phase-locking device, phase-locking device generally includes phase discriminator and software locks phase module, phase discriminator is used to obtain the local clock of adjustable clock devices output and the phase difference of reference clock source, and the software locks phase module is used for the gained phase difference is converted to required adjustment signal.The temperature of adjustable clock devices can be obtained by temperature sensor.
This adjustable clock devices can be but be not limited to is VCXO, temperature compensation VCXO etc., and the corresponding adjustment signal that obtains is voltage-controlled signal.
S302, utilize described temperature and adjustment signal that temperature and the adjustment signal correspondence table set up are in advance upgraded according to the update mechanism of setting;
When adjustable clock devices was VCXO or temperature compensation VCXO, temperature in this step and adjustment signal correspondence table were temperature and voltage-controlled signal correspondence table;
Temperature and adjustment signal correspondence table can comprise look-up table, adjustment signal corresponding under a certain temperature that obtains among the step S301 are covered pairing adjustment signal under the uniform temp of having stored in the look-up table;
The list item of look-up table can comprise temperature, adjustment signal, can also comprise update time; Look-up table is used to write down for searching temperature and the adjustment signal that calls; Table is long not to be limit;
Temperature and adjustment signal correspondence table can also comprise the ephemeral data table, and temperature of obtaining among the step S301 and adjustment signal at first deposit in the ephemeral data table, according to update mechanism look-up table are upgraded again;
The list item of ephemeral data table comprises writing time, temperature, adjustment signal; Write down real-time temperature and adjustment signal; Table is long to be limited according to actual conditions, usually when realizing, all adopt FIFO (First in Firstout, first in first out) memory, when table fills up, the data of new typing cover the data of typing at first in this table, so both can realize the continual renovation of ephemeral data table, can reduce the use of Installed System Memory again, also can reduce the operand of system, data is correct in the assurance look-up table, further improves the precision of temperature-compensating;
Utilizing the ephemeral data table that look-up table is carried out update mechanism is specially: when the list item under a certain temperature of new typing in the ephemeral data table satisfies following all update condition simultaneously, the corresponding list item under the uniform temp in the look-up table is dynamically updated.The list item that needs in the look-up table to upgrade can comprise update time and adjustment signal, also can comprise update time, temperature and adjustment signal, concrete renewal comprises that the list item with new logging data in the ephemeral data table covers under the same temperature list item corresponding in the look-up table, when being t such as temperature in the look-up table, be x corresponding update time, adjustment signal is m, the data temperature of new typing is t in the ephemeral data table, the corresponding typing time is y, adjustment signal is n, when the data of new typing satisfied following all update condition, x update time of correspondence changed y into when temperature in the look-up table was t, and adjustment signal m changes n into.
Concrete update condition comprises:
Condition one: the difference of the average of the temperature that there are all list items in the temperature in the new list item and ephemeral data table Central Plains in stability range, and newly the difference of the average of the adjustment signal value in the list item and ephemeral data table Central Plains adjustment signal value that all list items are arranged in stability range;
This condition can be avoided transient changing value typing look-up table, has guaranteed the correctness of data in the look-up table, further can improve the precision of temperature-compensating;
Condition two: the adjustment signal value of new list item is in setting range;
The adjustment signal of common adjustable clock devices all has certain scope, gets final product modification scope, and because manufacturer and model different, this adjustable scope is uncertain.Setting range herein is the normal range of operation of setting according to actual conditions in this adjustable scope;
The adjustment signal value typing look-up table that exceeds setting range when this condition can avoid happening suddenly big frequency deviation has guaranteed the correctness of data in the look-up table, has improved the precision of temperature-compensating;
Condition three: in the time term in the list item under a certain temperature of new typing and the look-up table under the same temperature difference of time corresponding item above the setting-up time scope;
This condition can be controlled the refreshing frequency of look-up table, reduces system's operand and system power dissipation thus, can also overcome simultaneously because the influence that device aging brings;
Condition four: the output clock and the reference clock source of adjustable clock devices are synchronous;
This condition can be avoided and will not pass through the adjustment signal typing look-up table that confirmation of synchronization obtains, because the adjustment signal that the output clock of adjustable clock devices and reference clock source obtain when not synchronous may be the adjustment signal of mistake, if by the typing look-up table, to influence the correctness of data in the look-up table, further the correctness of temperature-compensating is searched in influence; This condition also can be judged before temperature and adjustment signal typing ephemeral data table.
Above update mechanism can be adjusted according to actual conditions.
S303, call described correspondence table described adjustable clock devices is carried out temperature-compensating;
Can lose efficacy or not during onset, specifically comprised following situation the opportunity of calling for synchronization mechanism:
When reference clock source is lost;
When clock devices startup just or reset initialization;
In local clock and the reference clock source locking process, when temperature is undergone mutation.
In this step, temperature and adjustment signal correspondence table can play a role in clock devices work whole process, also can be only lose efficacy or adjustable clock devices are not carried out temperature-compensating during onset at synchronization mechanism.Effective at synchronization mechanism, reference clock source carries out the effective frequency deviation timing to adjustable clock devices, the local clock of adjustable clock devices output can reach synchronous by phase-locking device and reference clock source, but because reference clock source is lost, or synchronizing process is not also finished, local clock is when temperature influence is big again, local clock can not rely on reference clock source to carry out effective frequency offset correction, at this moment, call temperature and the adjustment signal correspondence table is regulated and control and temperature-compensating local clock, especially in local clock and reference clock source locking process, call correspondence table when temperature is undergone mutation and carry out temperature-compensating, can remedy the influence that variations in temperature is brought frequency timely.
By step S301-S303, the temperature compensation of the adjustable clock devices of present embodiment, can be under the stable and synchronously normal situation of reference clock source, temperature and adjustment signal correspondence table are upgraded and safeguarded, and according to this temperature and adjustment signal correspondence table, can lose or do not finish synchronously etc. under the situation at reference clock source, adjustable clock devices is regulated and control and temperature-compensating, overcome the influence that device parameters batch property and device aging bring, reduced stability requirement to reference clock source, also obtained the invalid or higher temperature-compensating precision of clock devices during onset not of synchronization mechanism, guaranteed the short-term stability of local clock, improved the robustness of system, also can shorten clock stabilization time in when start, made system provide professional as early as possible.
The device of temperature-compensating in another embodiment of the present invention as shown in Figure 4, comprising:
In communication system, clock synchronization apparatus is made up of phase discriminator module 4021 and software locks phase module 4022 usually, wherein:
Software locks phase module 4022 is used for obtaining corresponding adjustment signal according to differing of phase discriminator module 4021 outputs;
Memory 403: be used for storing temperature and adjustment signal correspondence table;
This temperature and adjustment signal correspondence table comprise look-up table 4031, but in order to control the refreshing frequency of look-up table, guarantee the stable and correct of look-up table, and temperature in the memory 403 and adjustment signal correspondence table can also comprise ephemeral data table 4032.
Wherein, the list item of look-up table 4031 comprises: update time, temperature, adjustment signal; Table is long not to be limit;
The list item of ephemeral data table 4032 comprises: writing time, temperature, adjustment signal; Table is long to be limited according to actual conditions; And the pattern of employing fifo fifo (First In First Out), when table record was full, one group of list item of typing at first covered during one group of list item of new typing will be shown.
When the correspondence table in the memory 403 comprises look-up table 4031 and ephemeral data table 4032, utilize the temperature of temperature sensor 401 acquisitions and the adjustment signal of synchronizer 402 acquisitions that ephemeral data table 4032 is upgraded, promptly temperature of Huo Deing and corresponding adjustment signal are stored in the ephemeral data table 4032; And the renewal of look-up table 4031 is specially according to update mechanism and utilizes this ephemeral data table that look-up table is upgraded.
Upgrade judging module 4041, be used for when temperature and adjustment signal typing ephemeral data table 4032, carry out the data comparison and upgrade judgement;
Correspondence table is called judge module 4042, is used for judging whether that according to setting needs call temperature and adjustment signal correspondence table;
Call judge module 4042 by correspondence table, in the time of can realizing the synchronization mechanism operate as normal, the local clock of adjustable clock devices output reaches synchronous by clock synchronization apparatus and reference clock source, but synchronization mechanism lost efficacy or also not during onset, lose as reference clock source, or synchronizing process also do not finish, and when the local clock temperature influence is big, calls regulation and control and the temperature-compensating to local clock of temperature and adjustment signal correspondence table.Reduced stability requirement like this to reference clock source, also obtained the invalid or higher temperature-compensating precision of clock devices during onset not of synchronization mechanism, guaranteed the short-term stability of local clock, improved the robustness of system, also can shorten clock stabilization time in when start, make system can provide professional as early as possible.
In order to control the frequency that adjustable clock devices temperature is obtained, this controller 404 can also comprise timer module 4043, is used for the temperature that control cycle ground receives the adjustable clock devices that temperature sensor 401 obtains.Certainly, some temperature sensor can property performance period obtains the function of temperature, and controller can comprise also and can not comprise the timer module this moment.
By this device embodiment, can realize the higher temperature-compensating of adjustable clock devices precision, and the acting in conjunction by temperature and adjustment signal correspondence table and synchronization mechanism, can reduce the requirement of stability to the reference clock source of input synchronizer, guaranteed the short-term stability of local clock, improved the robustness of system, also can shorten clock stabilization time in when start, made system can provide professional as early as possible.
The adjustable clock devices device of temperature compensation in another embodiment of the present invention as shown in Figure 5, comprising:
In communication system, clock synchronization apparatus is made up of phase discriminator module and software locks phase module usually, wherein:
The phase discriminator module be used for the local clock of adjustable clock devices output and the phase place of reference clock source are compared, and output differs;
The software locks phase module is used for obtaining corresponding adjustment signal according to differing of phase discriminator module output;
Memory 504: be used for storing temperature and adjustment signal correspondence table;
Wherein, temperature and adjustment signal correspondence table can comprise look-up table and ephemeral data table;
In this device embodiment, the adjustment signal of synchronizer 503 outputs is given controller 505.The adjustment signal of importing adjustable clock devices 501 is by controller 505 outputs, and this signal is selected according to setting by controller 505, can be from clock synchronization apparatus 503, and also can be from memory 504.Temperature sensor 502 is geographically should be as far as possible close with adjustable clock devices 501, can place in the same airtight cavity such as the two, to obtain the temperature of adjustable clock devices accurately.
By this device embodiment, correction and temperature-compensating that hardware and software matches and carries out clock have obtained the local clock of degree of precision, have further guaranteed the stability of system.The adjustable clock devices of this temperature compensation can be applied in the clock module of access point AP (Access Point), Home eNodeB, wireless little base station.
In this device embodiment, adjustable clock devices can be but be not limited to be VCXO, temperature compensation VCXO, adjustment signal should be voltage-controlled voltage mutually, the required adjustment signal of adjustable clock devices can be digital signal, also can be analog signal, and the adjustment signal of controller output is a digital signal.When required adjustment signal is analog signal, between controller and adjustable clock devices, increase digiverter, this digiverter can be digital to analog converter DA, also can be pulse width modulator PWM (Pulse-Width Modulation).It is shown in Figure 6 that to be adjustable clock devices be the temperature compensation VCXO, required adjustment signal is an analog signal, and, specifically comprise temperature compensation VCXO 601, temperature sensor 602, clock synchronization apparatus 603, memory 604, controller 605, digital to analog converter DA606 by the temperature compensation VCXO device that DA carries out digital-to-analogue conversion.Use this temperature compensation VCXO device,, compared with prior art, can obtain beneficial effect as shown in Table 1 and Table 2 through test.
| Detection | General T CXO | Method that the embodiment of the invention provides and device |
| Temperature drift (comparing) with common crystals | Improve 20 times | Improve 300 times |
| Compensation to long-term ageing | Do not have | Have |
| Supplied materials batch property influence | Bigger | Less |
| The start frequency settling time | Longer | Short |
Table 1
| Detection | OCXO | Method that the embodiment of the invention provides and device |
| Power consumption | Very high | Little |
| Price | Tens dollars | Several dollars |
| Environmental adaptability | Can not be higher than the internal control temperature | Allomeric nominal range unanimity |
| Compensation to long-term ageing | Do not have | Have |
| The start frequency settling time | Long | Short |
Table 2
A kind of access point AP (Access Point) that comprises the adjustable clock devices device of temperature compensation in another embodiment of the present invention as shown in Figure 7, comprising:
Radio-frequency module 705 is used to realize that baseband signal arrives the mutual conversion of radio frequency signal.
Access point AP in the embodiment of the invention is owing to adopted the method and apparatus of the temperature-compensating of soft or hard combination, can obtain the local clock of degree of precision, can also shorten the start frequency settling time of crystal oscillator significantly, the System production time when prolonging reference source-free, the robustness of raising system.Adjustable clock devices in this access point AP clock module 701 can be but be not limited to be VCXO, temperature compensation VCXO etc.
The method of temperature-compensating is provided in the embodiment of the invention, device and access point AP, clock devices and control circuit itself thereof have all been included in feedback control loop, can carry out tracking correction to each clock devices, temperature is floated the control effect and is not subjected to device parameters batch property influence of fluctuations, adopt software and hardware combining, increase temperature sensor on the hardware, take a spot of controller computing capability on the software, applying flexible, cost is lower, can overcome because the frequency shift (FS) that causes of device aging, and clock required stabilization time can shorten start significantly the time, operating time when the prolongation system does not have timing reference input, improved the robustness of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. the method for a temperature-compensating is characterized in that, comprising:
Obtain the temperature and the corresponding adjustment signal of adjustable clock devices;
Utilize described temperature and adjustment signal that temperature and the adjustment signal correspondence table set up are in advance upgraded according to the update mechanism of setting;
Call described correspondence table described adjustable clock devices is carried out temperature-compensating.
2. temperature compensation according to claim 1 is characterized in that, described temperature and adjustment signal correspondence table comprise look-up table; The list item of described look-up table comprises update time, temperature, adjustment signal; Record is for searching temperature and the adjustment signal that calls; Table is long not to be limit.
3. temperature compensation according to claim 2 is characterized in that, the empirical value of storing temperature and adjustment signal correspondence in advance in the described look-up table.
4. temperature compensation according to claim 2 is characterized in that, described temperature and adjustment signal correspondence table further comprise the ephemeral data table; The list item of described ephemeral data table comprises writing time, temperature, adjustment signal; Write down real-time temperature and adjustment signal; Table is long to be limited according to actual conditions.
5. temperature compensation according to claim 4 is characterized in that, described update mechanism comprises:
Described ephemeral data table utilizes described temperature and adjustment signal to upgrade, and described look-up table utilizes described ephemeral data table to upgrade.
6. temperature compensation according to claim 5 is characterized in that, described look-up table utilizes described ephemeral data table to upgrade and is specially:
List item under a certain temperature of new typing in the described ephemeral data table satisfies all update condition, and the corresponding list item under the uniform temp in the described look-up table is upgraded.
Described update condition specifically comprises:
Condition one: there is the difference of average of temperature of all list items in temperature in the described new list item and described ephemeral data table Central Plains in stability range, and there is the difference of average of adjustment signal value of all list items in the adjustment signal value in the described new list item and described ephemeral data table Central Plains in stability range;
Condition two: the adjustment signal value of described new list item is in setting range;
Condition three: in the list item that temperature term is identical with temperature in the look-up table in the described new list item, the time term value of list item surpasses the setting-up time scope in the time term of described new list item and the described look-up table;
Condition four: the output clock and the reference clock source of described adjustable clock devices are synchronous.
7. according to the method for claim 1 or 5 or 6 described temperature-compensatings, it is characterized in that, when synchronization mechanism is invalid, call described correspondence table described adjustable clock devices is carried out temperature-compensating.
8. temperature compensation according to claim 7 is characterized in that, described synchronization mechanism is invalid specifically to be comprised:
When described reference clock source is lost; Or described clock devices has just started or during reset initialization; Or in described local clock and the described reference clock source locking process, during temperature jump.
9. according to the method for claim 1 or 8 described temperature-compensatings, it is characterized in that described adjustable clock devices is a VCXO, described adjustment signal is voltage-controlled voltage, and described correspondence table is the correspondence table of temperature and voltage-controlled voltage.
10. the device of a temperature-compensating is characterized in that, comprising:
Temperature sensor is used to obtain the temperature of adjustable clock devices;
Synchronizer is used to obtain the adjustment signal of adjustable clock devices;
Memory is used for storing temperature and adjustment signal correspondence table;
Controller is used to utilize described temperature and described adjustment signal that described temperature and adjustment signal correspondence table are upgraded, and calls described temperature and the adjustment signal correspondence table is carried out temperature-compensating to described adjustable clock devices.
11. temperature compensation means according to claim 10 is characterized in that, comprising:
Described correspondence table comprises look-up table and ephemeral data table;
Described look-up table list item comprises: update time, temperature, adjustment signal; Table is long not to be limit;
Described ephemeral data table list item comprises: writing time, temperature, adjustment signal; Table is long to be limited according to actual conditions; And the pattern of employing fifo fifo, when table record was full, one group of list item of new typing covered one group of list item of typing at first.
12. temperature compensation means according to claim 11 is characterized in that, described controller specifically comprises:
Upgrade judging module, be used for when the described ephemeral data table of described temperature and adjustment signal typing, carry out data relatively and upgrade and adjudicate;
Correspondence table is called judge module, is used to judge whether to call described temperature and adjustment signal correspondence table.
13. temperature compensation means according to claim 12 is characterized in that, described controller also comprises:
The timer module is used for periodically obtaining the temperature of adjustable clock devices.
14. the adjustable clock devices device of temperature compensation is characterized in that, comprising:
Adjustable clock devices is used to produce local clock, and according to adjustment signal, output is through the local clock of overcorrect;
Temperature sensor is used to obtain the temperature of adjustable clock devices;
Synchronizer is used to obtain the adjustment signal of adjustable clock devices;
Memory is used for storing temperature and adjustment signal correspondence table;
Controller is used to utilize described temperature and described adjustment signal that described temperature and adjustment signal correspondence table are upgraded, and calls described temperature and the adjustment signal correspondence table is carried out temperature-compensating to described adjustable clock devices.
15. temperature compensation according to claim 14 is adjustable clock devices device is characterized in that described adjustable clock devices is a VCXO; Described adjustment signal is voltage-controlled signal; Described temperature and adjustment signal correspondence table are temperature and voltage-controlled signal correspondence table.
16., it is characterized in that also comprise analog-digital commutator, this analog-digital commutator is digital to analog converter DA, or pulse width modulator PWM according to claim 14 or the adjustable clock devices device of 15 described temperature compensations.
17. an access point AP who comprises the adjustable clock devices device of temperature compensation is characterized in that, comprising:
Clock module comprises the adjustable clock devices device of temperature compensation, is used for the clock generation circuit that comprises temperature compensation means by this, provides system required high precision clock;
Main control module is used to finish master control function, comprises that Operation and Maintenance, alarm detection report etc.;
Algorithm processing module is used to the base band signal process that realizes that radio communication is required, includes but not limited to processing such as demodulation, access, coding, decoding;
Radio-frequency module is used to realize that baseband signal arrives the mutual conversion of radio frequency signal;
Power module is used to system to provide operate as normal required power supply.
18. access point AP according to claim 17 is characterized in that, the adjustable clock devices in described temperature compensation the is adjustable clock devices device is a VCXO.
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| CNA2007101245044A CN101202531A (en) | 2007-11-12 | 2007-11-12 | Temperature compensation method, apparatus and access point |
| PCT/CN2008/073025 WO2009062446A1 (en) | 2007-11-12 | 2008-11-12 | Temperature compensation method, device and access point |
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| CNA2007101245044A CN101202531A (en) | 2007-11-12 | 2007-11-12 | Temperature compensation method, apparatus and access point |
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| CNA2007101245044A Pending CN101202531A (en) | 2007-11-12 | 2007-11-12 | Temperature compensation method, apparatus and access point |
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| WO (1) | WO2009062446A1 (en) |
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| US6445908B1 (en) * | 1999-10-18 | 2002-09-03 | Qualcomm Incorporated | Dynamic temperature compensation and stage selection in pilot signal acquisition |
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