CN100352175C - Method for controlling RF switch inversion according to SCDMA downstream synchronization code word - Google Patents
Method for controlling RF switch inversion according to SCDMA downstream synchronization code word Download PDFInfo
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- CN100352175C CN100352175C CNB2005100184627A CN200510018462A CN100352175C CN 100352175 C CN100352175 C CN 100352175C CN B2005100184627 A CNB2005100184627 A CN B2005100184627A CN 200510018462 A CN200510018462 A CN 200510018462A CN 100352175 C CN100352175 C CN 100352175C
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Abstract
The present invention relates to a method of controlling RF switch switching according to SCDMA downlink synchronous code words, which is carried out according to the procedures as following: (1) the downlink synchronous code word detecting part periodically and repeatedly demodulates and detects the downlink synchronous codewords; (2) a central processing unit and a switching control part use the starting point of the downlink synchronous codewords as a starting point of the switching according to the detected downlink synchronous code words; (3) the central processing unit and the switching control part add lead quantity according to the time delay of the switching of a device to generate a control signal, and the switching control part controls the switching of uplink and downlink RF switches at 5 ms intervals according to the control signal. The present invention can realize the exact control of the RF switch by an SCDMA repeater, and has the advantages of strong anti-interference ability, effective erroneous judgment reduction, RF switch control accuracy improvement and fewer restriction conditions of engineering use.
Description
Technical field
The present invention relates to a kind of method of in big well-informed SCDMA repeater, controlling RF switch inversion according to the SCDMA downstream synchronization code word.
Background technology
The overlay area of which kind of radio communication all will produce weak signal area and blind area, and to some remote districts and the few blind area of number of users, it is too high to set up the base station cost, infrastructure is also complicated, provide for this reason a kind of cost low, set up simple, but having cost-effective the equipment---repeater of small base station function, is necessary.Therefore, important role is being played the part of in the SCDMA repeater in the SCDMA network.
Because the SCDMA system is the work of TDD mode, so the SCDMA repeater needs a control signal come radio-frequency (RF) switch in the control appliance, finishes the up-downgoing of radio-frequency channel is switched.Existing SCDMA repeater mainly is by detecting SCDMA base station down signal strength signal intensity, the up-downgoing that realizes the repeater radio-frequency channel is switched, its method is: when base station transmit signals intensity was higher than certain level value, the repeater radiofrequency signal was switched to down channel; Otherwise the repeater radiofrequency signal is switched to up channel.But this method only is suitable for adopting between repeater and the base station mode of wired connection.For wireless SCDMA repeater, because it not only receives the signal of base station, and receive the signal that user mobile phone is launched simultaneously, and therefore utilize the signal strength detection method simply, can't realize accurately that the radio-frequency channel up-downgoing of SCDMA repeater is switched.
Summary of the invention
The objective of the invention is in order to overcome the above-mentioned defective that prior art exists, a kind of method of controlling RF switch inversion in wireless SCDMA repeater according to the SCDMA downlink synchronous signal is provided, this method can solve at the SCDMA network and strengthen in the covering application, the control of appearance uplink and downlink RF switch inversion is accurate inadequately, switching time delay is big, causes occurring in the communication process problems such as call drop, frequent switching.This method produces control signal accurately by detecting downstream synchronization code word, to reach the purpose of accurate control radio-frequency (RF) switch, erroneous judgement can not occur when guaranteeing SCDMA repeater operate as normal, improves network stabilization.
Technical scheme of the present invention is: a kind of method of controlling RF switch inversion in the SCDMA repeater according to the SCDMA downstream synchronization code word, described SCDMA repeater mainly comprises radio frequency amplifier section, downstream synchronization code word test section, central processing unit and switching control section, and this method is carried out as follows: (1) downstream synchronization code word test section regularly repeatedly demodulation detect downstream synchronization code word; (2) central processing unit and switching control section be according to detected downstream synchronization code word, is the starting point of switch transition with the starting point of downstream synchronization code word; (3) central processing unit and switching control section produce a control signal according to the additional certain lead of the switching time delay of equipment, by the conversion of switching control section according to this control signal control uplink and downlink radio-frequency (RF) switch, every the 5ms conversion once.Every 10ms second, the conversion starting point of uplink and downlink radio-frequency (RF) switch is just reorientated once.
The downstream synchronization code word test section of described SCDMA repeater, mainly form by radio frequency amplifying unit, quadrature demodulator, analog to digital converter and digital signal processing unit, resident serial search method is adopted in the detection of downstream synchronization code word twice, and concrete steps are as follows:
(1) be in state 1. the time when digital signal processing unit, digital signal processing unit is finished 32 chip analog to digital converter dateouts that local downstream synchronization code word and buffering area receive at each chip and is carried out related operation in the time, and with decision threshold θ
1Compare;
(2) if the output of correlator greater than decision threshold θ
1, then 2. digital signal processing unit forwards state to; Otherwise 1. it still be in state, and downstream synchronization code word indication synchronously is changed to 0;
(3) when digital signal processing unit forward to state 2. after, digital signal processing unit is finished local downstream synchronization code word at ensuing 96 chips and is carried out related operation with 96 chip analog to digital converter dateouts receiving in the time, and with decision threshold θ
2Compare;
(4) if the output of correlator greater than decision threshold θ
2, then think to search downstream synchronization code word, and downstream synchronization code word indication synchronously be changed to 1; Otherwise 1. it forward state to, and downstream synchronization code word indication synchronously is changed to 0.Wherein state 1. for the start after initial condition, state 2. be downstream synchronization code word in 32 chips correlation greater than thresholding θ
1State.
The present invention can realize that the SCDMA repeater controls accurately to radio-frequency (RF) switch.This scheme antijamming capability is strong, can effectively reduce erroneous judgement, improves the accuracy of radio-frequency (RF) switch control, and engineering pot life system condition is few.
Description of drawings
Fig. 1 uses block diagram for the SCDMA repeater.
Fig. 2 is a SCDMA repeater theory diagram.
Fig. 3 is a SCDMA downstream synchronization code word detecting unit block diagram.
Fig. 4 is a SCDMA signal correction computing block diagram.
Fig. 5 is twice resident serial search method flow chart.
Fig. 6 is a SCDMA repeater RF switch inversion flow chart.
Embodiment
The invention will be further described in conjunction with the accompanying drawings.
Fig. 1, Fig. 2, Fig. 3, Fig. 4 illustrate the concrete course of work of SCDMA of downstream synchronization code word detection mode control radio-frequency (RF) switch.The SCDMA repeater mainly comprises radio frequency amplifier section, downstream synchronization code word test section, central processing unit and switching control section.Wherein the SCDMA signal finished uplink and downlink of radio frequency amplifier section amplifies respectively; Downstream synchronization code word is constantly detected in the downstream synchronization code word test section; Central processing unit produces the radio-frequency (RF) switch control signal according to the downstream synchronization code word testing result; Switching control section is according to the conversion of this control signal control uplink and downlink radio-frequency (RF) switch, every the 5ms conversion once; Every 10ms, the conversion starting point of up-downgoing radio-frequency (RF) switch is just reorientated once, thereby realizes the accurate control of SCDMA repeater radio-frequency (RF) switch.SCDMA repeater radio-frequency (RF) switch is specifically switched flow process as shown in Figure 6.
The downstream synchronization code word test section comprises radio frequency amplifying unit, quadrature demodulator, analog to digital converter and digital signal processing unit.
For reducing downstream synchronization code word search time and system complexity, the present invention adopts twice resident serial search method to detect downstream synchronization code word, and as Fig. 5, its detailed process is as follows:
(1) be in state 1. the time when digital signal processing unit, digital signal processing unit is finished 32 chip analog to digital converter dateouts that local downstream synchronization code word and buffering area receive at each chip and is carried out related operation in the time, and with decision threshold θ
1Compare;
(2) if the output of correlator greater than decision threshold θ
1, then 2. digital signal processing unit forwards state to; Otherwise 1. it still be in state, and downstream synchronization code word indication synchronously is changed to 0;
(3) when digital signal processing unit forward to state 2. after, digital signal processing unit is finished local downstream synchronization code word at ensuing 96 chips and is carried out related operation with 96 chip analog to digital converter dateouts receiving in the time, and with decision threshold θ
2Compare;
(4) if the output of correlator greater than decision threshold θ
2, then think to search downstream synchronization code word, and downstream synchronization code word indication synchronously be changed to 1; Otherwise 1. it forward state to, and downstream synchronization code word indication synchronously is changed to 0.Wherein state 1. for the start after initial condition, state 2. be downstream synchronization code word in 32 chips correlation greater than thresholding θ
1State.
Claims (3)
1, a kind of method of in the SCDMA repeater, controlling RF switch inversion according to the SCDMA downstream synchronization code word, described SCDMA repeater mainly comprises radio frequency amplifier section, downstream synchronization code word test section, central processing unit and switching control section, it is characterized in that: this method is carried out as follows: (1) downstream synchronization code word test section regularly repeatedly demodulation detect downstream synchronization code word; (2) central processing unit and switching control section be according to detected downstream synchronization code word, is the starting point of switch transition with the starting point of downstream synchronization code word; (3) central processing unit and switching control section produce a control signal according to the additional certain lead of the switching time delay of equipment, by the conversion of switching control section according to this control signal control uplink and downlink radio-frequency (RF) switch, every the 5ms conversion once.
2, the method for RF switch inversion according to claim 1 is characterized in that: every 10ms, the conversion starting point of uplink and downlink radio-frequency (RF) switch is just reorientated once.
3, the method for RF switch inversion according to claim 1, it is characterized in that: the downstream synchronization code word test section of described SCDMA repeater, mainly form by radio frequency amplifying unit, quadrature demodulator, analog to digital converter and digital signal processing unit, resident serial search method is adopted in the detection of downstream synchronization code word twice, and concrete steps are as follows:
(1) be in state 1. the time when digital signal processing unit, digital signal processing unit is finished 32 chip analog to digital converter dateouts that local downstream synchronization code word and buffering area receive at each chip and is carried out related operation in the time, and with decision threshold θ
1Compare;
(2) if the output of correlator greater than decision threshold θ
1, then 2. digital signal processing unit forwards state to; Otherwise 1. it still be in state, and downstream synchronization code word indication synchronously is changed to 0;
(3) when digital signal processing unit forward to state 2. after, digital signal processing unit is finished local downstream synchronization code word at ensuing 96 chips and is carried out related operation with 96 chip analog to digital converter dateouts receiving in the time, and with decision threshold θ
2Compare;
(4) if the output of correlator greater than decision threshold θ
2, then think to search downstream synchronization code word, and downstream synchronization code word indication synchronously be changed to 1; Otherwise 1. it forward state to, and downstream synchronization code word indication synchronously is changed to 0, and wherein 1. state is the initial condition after the start, state 2. be downstream synchronization code word in 32 chips correlation greater than thresholding θ
1State.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100184627A CN100352175C (en) | 2005-03-28 | 2005-03-28 | Method for controlling RF switch inversion according to SCDMA downstream synchronization code word |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100184627A CN100352175C (en) | 2005-03-28 | 2005-03-28 | Method for controlling RF switch inversion according to SCDMA downstream synchronization code word |
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| CN1665152A CN1665152A (en) | 2005-09-07 |
| CN100352175C true CN100352175C (en) | 2007-11-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266559A (en) * | 1998-03-20 | 2000-09-13 | 株式会社东芝 | Radio transmitter/receiver, high-frequency radio receiver, and control unit |
| EP1361666A1 (en) * | 2001-01-29 | 2003-11-12 | NEC Corporation | Time division multiplexing connection transceiver and its receiving automatic gain control method |
| CN1514554A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司 | Diversity device used on TDD mobile communication system |
| CN1588812A (en) * | 2004-07-22 | 2005-03-02 | 武汉虹信通信技术有限责任公司 | Method for controlling radio frequency switch changeover according to PHS signal |
-
2005
- 2005-03-28 CN CNB2005100184627A patent/CN100352175C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1266559A (en) * | 1998-03-20 | 2000-09-13 | 株式会社东芝 | Radio transmitter/receiver, high-frequency radio receiver, and control unit |
| EP1361666A1 (en) * | 2001-01-29 | 2003-11-12 | NEC Corporation | Time division multiplexing connection transceiver and its receiving automatic gain control method |
| CN1514554A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司 | Diversity device used on TDD mobile communication system |
| CN1588812A (en) * | 2004-07-22 | 2005-03-02 | 武汉虹信通信技术有限责任公司 | Method for controlling radio frequency switch changeover according to PHS signal |
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| CN1665152A (en) | 2005-09-07 |
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