CN100407604C - Method for setting side reference frequency source of base station in time division communication system - Google Patents
Method for setting side reference frequency source of base station in time division communication system Download PDFInfo
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- CN100407604C CN100407604C CN021371296A CN02137129A CN100407604C CN 100407604 C CN100407604 C CN 100407604C CN 021371296 A CN021371296 A CN 021371296A CN 02137129 A CN02137129 A CN 02137129A CN 100407604 C CN100407604 C CN 100407604C
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- frequency source
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Abstract
The present invention discloses a setting method for a reference frequency source at a base station side in a time division communication system. The present invention is characterized in that the baseband part of the base station side uses a local reference frequency source which is strictly synchronized with a system clock; the radio frequency part of the base station side uses an independent high precision reference frequency source. The reference frequency source setting method provided by the present invention ensures that data in a time division system is synchronously processed and satisfies the requirement of the radio frequency part for the frequency stability of received and sent signals. Whether the complexity or the cost of a frequency source generator and added circuits of the frequency source generator of the radio frequency part added to the present invention is greatly lower than that of a clock stabilizing circuit added in a common method; therefore, when the method provided by the present invention is used, the present invention has the advantages of reduced system complexity and greatly reduced system cost under the condition that the requirements of system performance are satisfied.
Description
Technical field
The present invention relates to the base station of time division multiplexing (TDMA) digital mobile communication system, relate in particular to the method to set up of side reference frequency source of base station.
Background technology
As everyone knows, the communication system of time division multiplexing (TDMA) mode work, personal wireless communications system (PCS) particularly, because its channel and uplink and downlink data manipulation are all distinguished by the time, therefore the communication network that requires to work in this way no matter be between the base station or base station and network between on clock, must keep synchronous relation, so just can accomplish correct reception, transmission data and between the base station, avoid the phase mutual interference.For this reason, shared same system clock is wanted in each base station in the communication network, this clock by network side by cable transmission via isdn standard interface access base station end, local reference frequency source of the common use of base station side baseband portion and radio frequency part, this frequency source keeps identical frequency stability and accuracy by phase-locked method and system clock, reaches base station side and the synchronous purpose of network side with this.
In actual applications, the system clock that network side provides is delivered to each base station end by relaying several times with cable usually, the transmission range of cable is generally all long, like this, the shake of clock is unavoidable in transmission course, and consequent frequency deviation of clock can directly have influence on the frequency stability and the accuracy of side reference frequency source of base station.Use for system can bring following problem like this: 1, the reference frequency source that uses of baseband portion need with the system clock holding frequency on synchronously, can guarantee the transmitting-receiving of data like this and handle beat and network side strict conformance.But the frequency stability to system clock there is no very high requirement.For radio frequency part, the signal bandwidth of each channel occupancy is limited, for the frequency accuracy that guarantees to receive and transmit, requires the local reference frequency source of radio frequency part to have higher frequency stability and accuracy.So when the frequency deviation of network clocking causes the local reference frequency source of base station side also to have than large deviation more greatly, though, can't satisfy the requirement of reference frequency source that base station radio-frequency partly uses to frequency stability to the not influence of data processing of baseband portion.The consequence that directly causes is in such cases, and the reception of base station, tranmitting frequency deviation are bigger, may cause the base station normally to use.Even the deviation of 2 network side system clocks is in the frequency deviation region of radio frequency requirement, the local reference frequency source of base station side also still has problems: because will carry out phase-locked according to the variation of system clock after the base station powers on always, local reference frequency source is also still being finely tuned by phase-locked even the back is normally moved in the base station, and the slight jitter of system clock all can cause the adjustment of the local reference frequency source of base station side.But very high for the requirement of making an uproar mutually of reference frequency source in the radio frequency part local oscillator, the continuous adjustment of reference frequency source will worsen radio-frequency (RF) index.
The usual method of head it off is the circuit that increases stabilizing clock at the receiving terminal of inside of base station system clock, and the frequency stability of the system clock that network side is provided is brought up to and satisfied the degree that system's receiving and transmitting signal requires.This method is all adopted in known patent and patent application at present.This method can guarantee high accuracy and the high frequency stability of system clock at the base station end really, but adopts this method shortcoming to be: increased the complexity of base station side system, improved cost.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming, propose a kind of method to set up of side reference frequency source of base station of low complex degree cheaply.
The method to set up of side reference frequency source of base station in a kind of time division communication system, it is characterized in that adopting and the synchronous local reference frequency source of the strict maintenance of system clock, at the independently high-precision reference frequency source of radio frequency part employing of base station side in the baseband portion of base station side.
Said method comprises the following steps:
(1) system clock is introduced base station side;
(2) the local reference frequency source of generation base station side baseband portion;
(3) above-mentioned local reference frequency source is kept synchronously with system clock is strict by phase-locked;
(4) at the independently high-precision reference frequency source of base station side radio frequency part setting.
The method to set up of the reference frequency source that the present invention proposes is characterized in that base station side adopts " dual frequency source ": the local reference frequency source that baseband portion adopts with system clock as benchmark, by the phase-locked real-time strict synchronism that on frequency, keeps with system clock; Radio frequency part adopts independently high accuracy reference frequency source, and the frequency of this signal guarantees high stability by device and a little peripheral circuit, and this signal does not keep synchronous with system clock on frequency.So both guaranteed the synchronous of time-division system data processing, satisfied the requirement of radio frequency part again the receiving and transmitting signal frequency stability.The frequency source generator of the radio frequency part that increases among the present invention and adjunct circuit thereof all are significantly less than the clock stable circuit that increases in the usual method on complexity or cost, therefore, the method that adopts the present invention to propose, under the condition that satisfies the systematic function requirement, both can reduce the complexity of system, and can reduce the cost of system again greatly.
Description of drawings
Fig. 1 is the flow chart of the reference frequency source method to set up that proposes of the present invention.
Fig. 2 adopts the present invention to propose the system configuration schematic diagram of an embodiment of method.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the flow chart of the reference frequency source method to set up that proposes of the present invention.As shown in Figure 1, the method for the present invention's proposition specifically comprises four steps: (1) introduces base station side with system clock; (2) the local reference frequency source of generation base station side baseband portion; (3) above-mentioned local reference frequency source is kept synchronously with system clock is strict by phase-locked; (4) at the independently high-precision reference frequency source of base station side radio frequency part setting.In common practical application, use isdn standard interface drawing-in system clock, be to use voltage controlled oscillator and the reference frequency source of the baseband portion of base station side and radio frequency part all adopts, it is lower to do cost like this.And the reference frequency source of baseband portion is phase-locked by soft phase-locked the realization.From said method as can be seen, baseband portion is different with the reference frequency source that the radio-frequency part branch adopts, its difference is that the reference frequency source of baseband portion is synchronous with system clock, and the reference frequency source of radio frequency part and do not require with system clock on frequency synchronously, only require that reference frequency source has higher frequency accuracy and stability.
Fig. 2 adopts the present invention to propose the system configuration schematic diagram of an embodiment of method.Present embodiment is that the method that the base station side of PHS system adopts the present invention to propose is provided with reference frequency source.As shown in Figure 2,11 is network side, and 12 is base station side, and 111 is system clock, and 121 is the baseband portion of base station side, and 122 is the radio frequency part of base station side, and the system clock 111 of network side 11 is introduced the baseband portion 121 of base station side 12 by the isdn standard interface.1211 is the local reference frequency source generator of baseband portion, is a voltage controlled oscillator, the 1212nd, and error count unit, the 1213rd, pid algorithm unit, the 1214th, D/A AD conversion unit, the 1215th, base band data processing unit.The 1221st, the local reference frequency source generator of radio frequency part, employing also be voltage controlled oscillator, the 1222nd, local oscillation circuit, 1223 is radio frequency unit.
In baseband portion 121, its local reference frequency source is produced by voltage controlled oscillator 1211, output signal will be given base band data processing unit 1215, the generation of all baseband portion data processing sequential all with the reference frequency source of voltage controlled oscillator 1211 output as benchmark.And the system clock 111 that reference frequency source requires to provide with network side 11 keeps synchronously, could guarantee consistently with " step " of system on data processing like this, can make the time-division system working stability.With realizing by a closed-loop system synchronously of system clock 111.At first, reference frequency source and system clock 111 that voltage controlled oscillator 1211 produces all are transfused in the error count unit 1212, finish the statistics of unit interval internal reference frequency source and system clock frequency deviation by error count unit 1212, the deviate that counts is outputed in the pid algorithm unit 1213.The work that calculates the voltage adjustment amount according to difference is finished in pid algorithm unit 1213, and the voltage adjustment amount exported to D/A conversion unit 1214, the voltage change of numeral is converted to analog voltage, this aanalogvoltage adjustment amount can act on voltage controlled oscillator 1211, control the frequency change of the reference clock of its generation, make itself and system clock 111 synchronous.In radio frequency part 122, local reference frequency source is by independently clock circuit 1221 generations, and this frequency source signal will act on local oscillator unit 1222 and the radio frequency unit 1223, as their reference data simultaneously.Local oscillator unit 1222 produces radio frequency and intermediate frequency local oscillator, flows to radio frequency unit 1223, carries out Data Receiving and transmission on the different frequency according to system requirements.
Claims (4)
1. the method to set up of side reference frequency source of base station in the time division communication system, it is characterized in that: the baseband portion in base station side adopts and the synchronous local reference frequency source of the strict maintenance of system clock, radio frequency part in base station side adopts independently high-precision reference frequency source, comprises the steps:
(1) system clock is introduced base station side;
(2) the local reference frequency source of generation base station side baseband portion;
(3) above-mentioned local reference frequency source is kept synchronously with system clock is strict by phase-locked;
(4) at the independently high-precision reference frequency source of base station side radio frequency part setting.
2. the method to set up of side reference frequency source of base station in a kind of time division communication system according to claim 1 is characterized in that: the system clock in the described step (1) is introduced base station side by the isdn standard interface.
3. the method to set up of side reference frequency source of base station in a kind of time division communication system according to claim 2 is characterized in that: the reference frequency source that radio frequency part adopts in local reference frequency source in the described step (2) and the step (4) all produces with voltage controlled oscillator.
4. the method to set up of side reference frequency source of base station in a kind of time division communication system according to claim 2 is characterized in that: phase-locked in the described step (3) realizes by software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN021371296A CN100407604C (en) | 2002-09-21 | 2002-09-21 | Method for setting side reference frequency source of base station in time division communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN021371296A CN100407604C (en) | 2002-09-21 | 2002-09-21 | Method for setting side reference frequency source of base station in time division communication system |
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| Publication Number | Publication Date |
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| CN1484396A CN1484396A (en) | 2004-03-24 |
| CN100407604C true CN100407604C (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN021371296A Expired - Lifetime CN100407604C (en) | 2002-09-21 | 2002-09-21 | Method for setting side reference frequency source of base station in time division communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1878054B (en) * | 2006-02-07 | 2010-05-12 | 华为技术有限公司 | Clock reference device and method for IP network transmission base station |
| CN103209070B (en) * | 2013-03-14 | 2016-03-30 | 中山大学 | A kind of digital interface radio frequency chips and its implementation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114743A (en) * | 1994-03-01 | 1996-01-10 | 脱普考恩株式会社 | Apparatus for detecting a light signal |
| CN1275040A (en) * | 1999-05-21 | 2000-11-29 | 深圳市中兴通讯股份有限公司 | Intelligent transceiver and its operation and control device |
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2002
- 2002-09-21 CN CN021371296A patent/CN100407604C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114743A (en) * | 1994-03-01 | 1996-01-10 | 脱普考恩株式会社 | Apparatus for detecting a light signal |
| CN1275040A (en) * | 1999-05-21 | 2000-11-29 | 深圳市中兴通讯股份有限公司 | Intelligent transceiver and its operation and control device |
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| CN1484396A (en) | 2004-03-24 |
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