CN202772880U - Base station locking system based on CDMA2000 continuous carrier wave - Google Patents

Base station locking system based on CDMA2000 continuous carrier wave Download PDF

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Publication number
CN202772880U
CN202772880U CN 201220381931 CN201220381931U CN202772880U CN 202772880 U CN202772880 U CN 202772880U CN 201220381931 CN201220381931 CN 201220381931 CN 201220381931 U CN201220381931 U CN 201220381931U CN 202772880 U CN202772880 U CN 202772880U
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module
pilot
output
digital
cdma2000
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郝禄国
杨建坡
余斯擎
余嘉池
杨舜君
何仕杰
曾文彬
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Allwin Telecommunication Co Ltd
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Allwin Telecommunication Co Ltd
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Abstract

The utility model discloses a base station locking system based on CDMA2000. The system comprises an analog-to-digital converter, a first digital up conversion module, a first digital down conversion module, an interference cancellation module, an automatic level control module, a frequency selection filter module, complex digital up conversion modules, complex digital down conversion modules, a base station locking module and a digital-to-analog converter. A method comprises the following steps of converting an input signal via the analog-to-digital converter; performing down conversion of the signal to the zero frequency via the first digital down conversion module and performing filter extraction; performing interference cancellation via the interference cancellation module; performing the level control via the automatic level control module; performing complex down conversion, frequency selection filter and complex up conversion; sending the signal to the base station locking module so as to be processed; performing up conversion of the signal to the intermediate frequency; converting the signal to an analog intermediate-frequency signal via the digital-to-analog converter; and performing analog mixing and then sending the signal to a power amplifier so as to be amplified and outputted. The system of the utility model can reduce the pilot frequency power adjacent to the target base station and exclude the possibility of a cellphone being locked to a non-target base station, and can be widely applied in the communication field.

Description

Base station lock fixed system based on the CDMA2000 continuous carrier
Technical field
The utility model relates to communication field, especially a kind of base station lock fixed system based on the CDMA2000 continuous carrier.
Background technology
Terminological interpretation:
ADC (Analog-to-Digital Converter): analog to digital converter;
CDMA (Wideband Code Division Multiple Access): code division multiple access is a kind of third generation wireless communication technique;
DAC (Digital-to-Analog Converter): digital to analog converter;
FPGA (Field Programmable Gate Array): field programmable gate array;
ICS (Interference Cancellation System): interference cancellation systems;
CCS (CPICH Cancellation System): pilot counteracting system;
PN sequence (Pseudo-noise Sequence): pseudo noise sequence.
During daily use, in digital radio repeater, can not screen and be exaggerated simultaneously owing to receiving signal, thus impact conversation and online quality.The pilot pollution problem that ubiquity is caused by base station selection.
Existing scheme mainly is to adjust the direction of reception antenna and base station that angle avoids a plurality of power to approach is amplified simultaneously, but effect is limited and can increase the engineering difficulty and reduce the popularity that product is used like this.
The utility model content
In order to solve above-mentioned technical problem, the purpose of this utility model provides a kind of effective increase wireless product covering quality and reduces the base station lock fixed system based on the CDMA2000 continuous carrier of difficulty of construction.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
Base station lock fixed system based on the CDMA2000 continuous carrier, comprise analog to digital converter, the output of described analog to digital converter is connected with the first Digital Down Converter Module in turn, the Interference Cancellation module, the automatic electric-level control module, the output of described automatic electric-level control module is connected with four groups of parallel branches that structure is identical, be connected with plural Digital Down Converter Module in each branch road in turn, tunable filter and plural Digital Up Convert module, the output in parallel of described each branch road is connected to the input of the first pilot counteracting module, the output of the first pilot counteracting module is connected with the second pilot counteracting module in turn, the first Digital Up Convert module and digital to analog converter, optional branch road in described four groups of parallel branches, another output of tunable filter also is connected with CDMA2000 pilot tone matched filter and CDMA2000 1x demodulator in turn in the selected branch road, another output of described CDMA2000 pilot tone matched filter is connected with another input of plural Digital Up Convert module in the described selected branch road, described CDMA2000 1x demodulator output respectively with the first pilot counteracting module, another input of the second pilot counteracting module connects.
Be further used as preferred embodiment, described the first pilot counteracting module comprises pilot generator, the output of pilot generator is connected with respectively the first channel estimation module and second channel estimation module, the input stack of the output of described the first channel estimation module and the first pilot counteracting module is joined and is output as first interface, and the output stack of first interface and second channel estimation module is joined as the output of the first pilot counteracting module.
Be further used as preferred embodiment, include successively the pilot PN sequence biasing generation module pilot frequency sequence generation module identical and in parallel with two structures in the described pilot generator, the output of described two pilot frequency sequence generation modules is connected with the input of the first channel estimation module, second channel estimation module respectively.
Be further used as preferred embodiment, the structure of described the second pilot counteracting module is identical with the structure of the first pilot counteracting module.
Be further used as preferred embodiment, on above-mentioned all execution mode bases, the output of tunable filter also is connected with the frequency offset correction module in the described selected branch road, and the output of described frequency offset correction module is connected with another input of the first Digital Down Converter Module.
Base station locking means based on the CDMA2000 continuous carrier may further comprise the steps:
A, input signal carry out analog-to-digital conversion through analog to digital converter;
B, be down-converted to zero-frequency through the first Digital Down Converter Module, and filtering extraction;
C, process interference cancellation systems are carried out Interference Cancellation, prevent self-excitation;
D, process automatic electric-level module are carried out level control, with the protection power amplifier;
E, carry out plural down-conversion, and frequency-selective filtering and plural up-conversion;
F, send to the base station locking module and process;
G, make the signal up-conversion to intermediate-freuqncy signal;
H, process digital-to-analogue conversion become analog if signal;
Issue power amplifier behind I, the process analog frequency mixing and amplify output.
Be further used as preferred embodiment, comprise frequency deviation estimation processing among the described step B.
Be further used as preferred embodiment, include in the described step F according to the signal that receives and realize Cell searching, calculate the bias of current area pilot PN sequence according to the output signal of CDMA2000 1x demodulator by matched filter.
Be further used as preferred embodiment, include the corresponding pilot frequency sequence of generation in the described step F, choose the district pilots sequence that need to suppress and carry out channel estimating and pilot tone inhibition processing is done in the residential quarter that needs suppress with receiving signal.
The beneficial effects of the utility model are: the utility model can be the pilot power reduction approaching with the target BS signal based on the base station lock fixed system of CDMA2000 continuous carrier, the base station that simultaneously also may select oneself to want is served, pressure with the balance base station, get rid of the possibility that mobile phone locks onto non-target BS, efficiently solve the technical problem that the approaching base station of a plurality of power is amplified simultaneously, reduce difficulty of construction, practicality is good, has a good application prospect.
Description of drawings
Fig. 1 is based on the structured flowchart of CDMA2000 base station lock fixed system;
Fig. 2 is the structure chart of the first pilot counteracting module and the second pilot counteracting module among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
With reference to Fig. 1, base station lock fixed system based on the CDMA2000 continuous carrier, comprise analog to digital converter, the output of described analog to digital converter is connected with the first Digital Down Converter Module in turn, the Interference Cancellation module, the automatic electric-level control module, the output of described automatic electric-level control module is connected with four groups of parallel branches that structure is identical, be connected with plural Digital Down Converter Module in each branch road in turn, tunable filter and plural Digital Up Convert module, the output in parallel of described each branch road is connected to the input of the first pilot counteracting module, the output of the first pilot counteracting module is connected with the second pilot counteracting module in turn, the first Digital Up Convert module and digital to analog converter, optional branch road in described four groups of parallel branches, another output of tunable filter also is connected with CDMA2000 pilot tone matched filter and CDMA2000 1x demodulator in turn in the selected branch road, another output of described CDMA2000 pilot tone matched filter is connected with another input of plural Digital Up Convert module in the described selected branch road, described CDMA2000 1x demodulator output respectively with the first pilot counteracting module, another input of the second pilot counteracting module connects.
With reference to figure 2, be further used as preferred embodiment, described the first pilot counteracting module comprises pilot generator, the output of pilot generator is connected with respectively the first channel estimation module and second channel estimation module, the input stack of the output of described the first channel estimation module and the first pilot counteracting module is joined and is output as first interface, and the output stack of first interface and second channel estimation module is joined as the output of the first pilot counteracting module.
With reference to figure 2, be further used as preferred embodiment, include successively the pilot PN sequence biasing generation module pilot frequency sequence generation module identical and in parallel with two structures in the described pilot generator, the output of described two pilot frequency sequence generation modules is connected with the input of the first channel estimation module, second channel estimation module respectively.
Be further used as preferred embodiment, the structure of described the second pilot counteracting module is identical with the structure of the first pilot counteracting module.
With reference to figure 1, be further used as preferred embodiment, on above-mentioned all execution mode bases, the output of tunable filter also is connected with the frequency offset correction module in the described selected branch road, and the output of described frequency offset correction module is connected with another input of the first Digital Down Converter Module.
Base station locking means based on the CDMA2000 continuous carrier may further comprise the steps:
A, input signal carry out analog-to-digital conversion through analog to digital converter;
B, be down-converted to zero-frequency through the first Digital Down Converter Module, and filtering extraction;
C, process interference cancellation systems are carried out Interference Cancellation, prevent self-excitation;
D, process automatic electric-level module are carried out level control, with the protection power amplifier;
E, carry out plural down-conversion, and frequency-selective filtering and plural up-conversion;
F, send to the base station locking module and process;
G, make the signal up-conversion to intermediate-freuqncy signal;
H, process digital-to-analogue conversion become analog if signal;
Issue power amplifier behind I, the process analog frequency mixing and amplify output.
Be further used as preferred embodiment, comprise frequency deviation estimation processing among the described step B.
Be further used as preferred embodiment, include in the described step F according to the signal that receives and realize Cell searching, calculate the bias of current area pilot PN sequence according to the output signal of CDMA2000 1x demodulator by matched filter.
Be further used as preferred embodiment, include the corresponding pilot frequency sequence of generation in the described step F, choose the district pilots sequence that need to suppress and carry out channel estimating and pilot tone inhibition processing is done in the residential quarter that needs suppress with receiving signal.
The beneficial effects of the utility model are: the utility model can be the pilot power reduction approaching with the target BS signal based on the base station lock fixed system of CDMA2000 continuous carrier, get rid of the possibility that mobile phone locks onto non-target BS, the base station that simultaneously also may select oneself to want is served, with the pressure of balance base station.
As shown in Figure 1, the signal that antenna reception arrives, at first be down-converted to analog intermediate frequency signal through radio frequency processing, again through an analog to digital converter (ADC), analog if signal is converted to digital medium-frequency signal and sends into FPGA, FPGA realizes different functions by programming, signal is processed, comprise Digital up and down convert, digital filtering, the functions such as pilot counteracting algorithm, then digital to analog converter (DAC) converts the digital signal of processing through FPGA to analog if signal, pass through again radio frequency processing, send finally by crossing power amplifier.
Wherein, the processing module of FPGA inside is the core of whole system, comprises frequency offset correction, tunable filter, matched filter, pilot counteracting, channel estimating etc.
The difficult point one of this programme is frequency-selective filtering, and CDMA carrier wave passband is 1.2288M, and filter bag is 1.23M, and the situation (for example Beijing is six carrier waves) of continuous carrier can occur, is impossible so directly do the frequency-selective filtering of seven passages.Therefore this programme tunable filter of having designed four-way carries out filtering, four carrier waves appear when being discontinuous at most simultaneously, consecutive hours then switches other filters, unnecessary passage is just closed, when seven carrier waves are opened simultaneously, just only have a passage to carry out work, so just can make filter bag wide, thereby the realization frequency-selective filtering, this also gets ready for pilot counteracting (CCS).
The difficult point two of this programme is pilot counteracting, because this programme has adopted the first technology of the rear frequency-selecting of choosing band, so seven carrier waves bring processing as one, so with respect to each carrier wave, being to be in Low Medium Frequency (except the mean carrier), also is that pilot counteracting is in the technical realization of intermediate frequency.From the signal that reception antenna receives, comprised the signal of a plurality of different base stations.In internal system a pilot generator is arranged, can produce the pilot signal corresponding with input signal.We at first do Cell searching according to the signal that receives, and find local all residential quarters (being assumed to be 3).The CDMA2000 residential quarter is to distinguish according to the bias of its pilot PN sequence.Mainly by the matched filter realization, the structural design matched filter according to the 1x pilot channel obtains the pilot tone relevant peaks to Cell searching, calculates the bias of current area pilot PN sequence according to CDMA2000 1x demodulation output.Because module exists certain frequency deviation with the base station, so this programme has designed the frequency offset correction module to realize correct demodulation.
According to the residential quarter that searches out, the corresponding pilot frequency sequence of our regeneration is chosen the district pilots sequence of 2 needs inhibition and is received signal and carries out together channel estimating.The local pilot generator signal that we will draw carries out the estimation of channel, and the impulse response of obtaining channel goes out, and simulates through the channel impulse response of estimating and want repressed pilot signal from input signal; Then receive signal with subtracting each other, draw difference, its effect is the tap coefficient of constantly adjusting channel impulse response, and order is more near real channel.Simultaneously, also be the signal that suppresses through pilot tone, gone out by antenna transmission again.
Algorithm principle:
These software systems be utilize the repeater transmit and echo signal between correlation, come separate targets base station signal and non-target BS signal.Specifically use LMS(Least Mean Square) algorithm.Its algorithm core can be summed up as following several renewal equations:
The form that changes into real number according to the complex operation equation of LMS algorithm, equation is as follows after transforming:
The tap input vector:
Figure 2012203819317100002DEST_PATH_IMAGE001
Desired signal:
Figure 943844DEST_PATH_IMAGE002
The tap weights coefficient:
Figure 2012203819317100002DEST_PATH_IMAGE003
Filter output:
Figure 985618DEST_PATH_IMAGE004
Estimation error signal:
Corresponding renewal equation:
Figure 391454DEST_PATH_IMAGE006
Figure 2012203819317100002DEST_PATH_IMAGE009
Wherein I, Q represent that signal carries out the cross stream component on complex plane after the down-conversion and combines to component.
Software systems are finished the estimation to pilot signal, and then are finished the separation of different base station pilot signal by constantly carrying out above several equations.
More than be that better enforcement of the present utility model is specified, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art can also make all equivalent variations or replacement under the prerequisite of the utility model spirit, the distortion that these are equal to or replacement all are included in the application's claim limited range.

Claims (5)

1. based on the base station lock fixed system of CDMA2000 continuous carrier, it is characterized in that: comprise analog to digital converter, the output of described analog to digital converter is connected with the first Digital Down Converter Module in turn, the Interference Cancellation module, the automatic electric-level control module, the output of described automatic electric-level control module is connected with four groups of parallel branches that structure is identical, be connected with plural Digital Down Converter Module in each branch road in turn, tunable filter and plural Digital Up Convert module, the output in parallel of described each branch road is connected to the input of the first pilot counteracting module, the output of the first pilot counteracting module is connected with the second pilot counteracting module in turn, the first Digital Up Convert module and digital to analog converter, optional branch road in described four groups of parallel branches, another output of tunable filter also is connected with CDMA2000 pilot tone matched filter and CDMA2000 1x demodulator in turn in the selected branch road, another output of described CDMA2000 pilot tone matched filter is connected with another input of plural Digital Up Convert module in the described selected branch road, described CDMA2000 1x demodulator output respectively with the first pilot counteracting module, another input of the second pilot counteracting module connects.
2. the base station lock fixed system based on the CDMA2000 continuous carrier according to claim 1, it is characterized in that: described the first pilot counteracting module includes pilot generator, the input of pilot generator is connected with CDMA2000 1x demodulator output, the output of pilot generator is connected with respectively the first channel estimation module and second channel estimation module, the input stack of the output of described the first channel estimation module and the first pilot counteracting module is joined and is output as first interface, and the output stack of first interface and second channel estimation module is joined as the output of the first pilot counteracting module.
3. the base station lock fixed system based on the CDMA2000 continuous carrier according to claim 2, it is characterized in that: include successively the pilot PN sequence biasing generation module pilot frequency sequence generation module identical and in parallel with two structures in the described pilot generator, the output of described two pilot frequency sequence generation modules is connected with the input of the first channel estimation module, second channel estimation module respectively.
4. the base station lock fixed system based on the CDMA2000 continuous carrier according to claim 3, it is characterized in that: the structure of described the second pilot counteracting module is identical with the structure of the first pilot counteracting module.
5. each described base station lock fixed system based on the CDMA2000 continuous carrier in 4 according to claim 1, it is characterized in that: the output of tunable filter also is connected with the frequency offset correction module in the described selected branch road, and the output of described frequency offset correction module is connected with another input of the first Digital Down Converter Module.
CN 201220381931 2012-08-02 2012-08-02 Base station locking system based on CDMA2000 continuous carrier wave Withdrawn - After Issue CN202772880U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102833766A (en) * 2012-08-02 2012-12-19 奥维通信股份有限公司 System and method for locking base station based on CDMA 2000 continuous carriers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102833766A (en) * 2012-08-02 2012-12-19 奥维通信股份有限公司 System and method for locking base station based on CDMA 2000 continuous carriers
CN102833766B (en) * 2012-08-02 2016-06-01 奥维通信股份有限公司 Based on base station lock fixed system and the method for the continuous carrier wave of CDMA2000

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