CN102170297A - PN (pseudo noise) offset obtaining device and method for CDMA (code division multiple access) system - Google Patents
PN (pseudo noise) offset obtaining device and method for CDMA (code division multiple access) system Download PDFInfo
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- CN102170297A CN102170297A CN2011101028049A CN201110102804A CN102170297A CN 102170297 A CN102170297 A CN 102170297A CN 2011101028049 A CN2011101028049 A CN 2011101028049A CN 201110102804 A CN201110102804 A CN 201110102804A CN 102170297 A CN102170297 A CN 102170297A
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Abstract
The invention relates to a PN (pseudo noise) offset obtaining device and a method thereof for a CDMA (code division multiple access) system. According to the method, base station PN offset is recognized by receiving a base station signal in the CDMA system, and the device for the method comprises an antenna module, a down mixing module, an A/D (analog to digital) module, a DDC (digital down conversion) module, a base band processing module and a PN obtaining module. A signal which is sent by the base station is received by the antenna module and is processed by the down mixing module, the A/D module, the DDC module and the base band processing module in sequence, the PN offset is obtained by a sequence which is processed by the base band processing module through an algorithm which is specified in a PN offset obtaining module, and a corresponding PN sequence is generated according to the obtained PN offset. The method has the beneficial effects that compared with a traditional de-synchronizing channel method which obtains the PN offsets, the method is simple and is easy to realize.
Description
Technical field
Technology is obtained in the PN biasing that the present invention relates to the cdma communication technical field, mainly is a kind of cdma system PN biasing deriving means and method.
Background technology
In the cdma system, carry out spread spectrum by the WALASH sign indicating number, by the PN short code sequence to spread spectrum after sequence carry out multiple scrambler, identical PN short code sequence is used in the base station, still, the PN short code sequence biasing that adopt different base stations is different.Can distinguish the base station by different PN short code sequence biasings.
At spreading rate 1, PN sequence generator polynomial is:
P
I(x)＝x
15+x
13+x
9+x
8+x
7+x
5+1 (1)
P
Q(x)＝x
15+x
12+x
11+x
10+x
6+x
5+x
4+x
3+1 (2)
Wherein, P
I(x) be I road generator polynomial, P
Q(x) being Q road generator polynomial, is 2 based on the maximum length of above-mentioned polynomial linear feedback shift register sequence i (n) and q (n)
15-1, and pass through following recurrence formula and derive:
And
Wherein, (3) formula is based on generator polynomial P
I(x), (4) formula is based on generator polynomial P
Q(x), i (n) and q (n) are binary system (' 0 ' and ' 1 '), and adopt nodulo-2 addition.In order to obtain I and Q road cycle is 32768=2
15The PN short code sequence, 14 continuous outputs ' 0 ' output once only took place in each cycle after, to one ' 0 ' of insertion among i (n) and the q (n); Therefore the PN short code sequence has 15 ' 0 ' continuous outputs.
32768 PN sequences that Q road, I road generates are divided into 512 groups by chip offset, and the side-play amount size is 64 chip lengths.512 groups of PN sequences are denoted as PN0, and PN1L PN511, PN0 are called PN and are biased to 0 PN biasing.512 groups of PN sequences obtain by 32768 chip cyclic shifts, and the PN0 original position is ' 1 ' after 15 continuous ' 0 ' outputs; PN n original position is PN0+64*n.
In forward link, the value of PN biasing is kept at synchronizing channel, informs receiving terminal by sending synchronizing channel.Receiving terminal generally can obtain the PN biasing by the demodulation synchronizing channel, but the demodulation synchronizing channel exists amount of calculation big, the computing complicated problems.
Summary of the invention
Purpose of the present invention will overcome the deficiency of above-mentioned technology just, and provides a kind of amount of calculation low, simple cdma system PN biasing deriving means of computing and method.
The present invention solves the technical scheme that its technical problem adopts: this cdma system PN biasing acquisition methods, the PN sequence offset amount PILOT_MEASURE that receiving terminal obtains by matched filter is set, this parameter is made up of the chip offset that PN biasing and PN short code caused in time of time of space transmission and hardware handles, obtains pilot offset increment PI LOT_INC; PN biasing in base station is calculated by following formula and is obtained:
Wherein
For rounding operation, PILOT_INC is a cdma system pilot offset increment, is the cdma system given value, obtains from system.
It is as follows that described PN acquisition module obtains PN biasing step:
A, a carrier wave sequence top n sequence x (n) who from baseband processing module, obtains and the data input pin that moves into matched filter, N is the matched filter tap number;
Top n sequence in b, the PN memory module in the local PN sequence moves into matched filter, and simultaneously, local sequence cycles moves to left one;
C, do convolution algorithm, promptly be equivalent to carry out related operation, and preserve the shift count of operation result and local sequence by matched filter;
If the operation result value of d c step equals N or local sequence is finished the one-period circulation, then carry out the operation of e step, otherwise, carry out the operation of c step;
If e c step operation end value equals N, obtain shift count, carry out the operation of g step; If local sequence is finished the one-period circulation, then carry out the operation of f step;
This operation result of N of f, comparison c step is got maximum, and shift count when obtaining maximum, carries out the operation of g step;
G, obtain shift count, obtain the PN deviant;
H, obtain the PN side-play amount of received signal by the PN acquisition module, by the PN biasing that (5) formula calculates received signal, PILOT_MEASURE is the PN side-play amount that obtains in the g step in the formula.
This cdma system PN biasing deriving means of the present invention, comprise Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module, Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module are serially connected successively, the PN acquisition module comprises PN sequence memory module, matched filter module and signal processing module, the output of baseband processing module is connected with the input of matched filter module, the output of matched filter module is connected with the input of signal processing module, and PN sequence memory module is connected with matched filter module.
Described Anneta module is used for the base station side received signal; Following frequency mixing module, the radiofrequency signal that is used for receiving from antenna becomes intermediate-freuqncy signal; The A/D module is used for receiving analog intermediate frequency signal from following frequency mixing module, and the analog-signal transitions that receives is become digital medium-frequency signal; The DDC module is used for each carrier signal is transformed into the zero intermediate frequency digital signal; Baseband processing module is used for extracting a carrier wave sequence from the zero intermediate frequency digital signal of DDC module, and by receiving filter this carrier wave sequence is handled.
The effect that the present invention is useful is: the signal that receives base station by Anneta module, successively through frequency mixing module, A/D module, DDC module, baseband processing module are handled down, algorithm by appointment in the sequence process PN biasing acquisition module of baseband processing module processing, finish the PN biasing and obtain, generate corresponding PN sequence according to the PN biasing of obtaining.The effect that the present invention is useful: more traditional synchronizing channel method of separating is obtained the PN biasing, and this method is simple, is easy to realize.
Description of drawings
The general frame is obtained in accompanying drawing 1PN biasing.
Accompanying drawing 2PN acquisition module internal module figure.
Accompanying drawing 3 matched filter block diagrams.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, reach for example below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that described hereinly, and be not used in qualification the present invention for example only in order to explaining the present invention.
This cdma system PN biasing acquisition methods of the present invention, the PN sequence offset amount PILOT_MEASURE that receiving terminal obtains by matched filter is set, this parameter is made up of the chip offset that PN biasing and PN short code caused in time of time of space transmission and hardware handles, obtains pilot offset increment PI LOT_INC; PN biasing in base station is calculated by following formula and is obtained:
Wherein
For rounding operation, PILOT_INC is a cdma system pilot offset increment, is the cdma system given value, obtains from system.
The value of supposing the PILOT MEASURE that obtains by the receiving terminal matched filter is 200, and PILOT INC is 4.Then,
Can obtain the signal that receiving terminal receives and be biased to 4 base station from PN.
It is as follows that described PN acquisition module obtains PN biasing step:
A, a carrier wave sequence top n sequence x (n) who from baseband processing module, obtains and the data input pin that moves into matched filter, N is the matched filter tap number, getting N is 64;
Top n sequence c (n) in b, the PN memory module in the local PN sequence moves into the coefficient end of matched filter, simultaneously, the local sequence data that is stored in the memory ram upgrades once, with original data sequence [c (0), c (1), ... ..c (32767)] carry out 64 of ring shift lefts, promptly the new sequence after the displacement becomes [c (64), c (65) ... ..c (32767), c (0), c (1), c (63)], the data arrangement of sequence has occurred in sequence change like this, and the order that is equivalent to local PN sequence is 64 (they being PN=1);
C, do convolution algorithm, promptly be equivalent to carry out related operation, and preserve the shift count of operation result and local sequence by matched filter;
If the operation result value of d c step equals N or local sequence is finished the one-period circulation, then carry out the operation of e step, otherwise, carry out the operation of c step;
If e c step operation end value equals N, obtain shift count, carry out the operation of g step; If local sequence is finished the one-period circulation, then carry out the operation of f step;
This operation result of N of f, comparison c step is got maximum, and shift count when obtaining maximum, carries out the operation of g step;
G, obtain shift count, obtain the PN deviant;
H, obtain the PN side-play amount of received signal by the PN acquisition module, by the PN biasing that (5) formula calculates received signal, PILOT_MEASURE is the PN side-play amount that obtains in the g step in the formula.
This cdma system PN biasing deriving means of the present invention, comprise Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module, Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module are serially connected successively, the PN acquisition module comprises PN sequence memory module, matched filter module and signal processing module, the output of baseband processing module is connected with the input of matched filter module, the output of matched filter module is connected with the input of signal processing module, and PN sequence memory module is connected with matched filter module.
Described Anneta module is used for the base station side received signal; Following frequency mixing module, the radiofrequency signal that is used for receiving from antenna becomes intermediate-freuqncy signal, and radiofrequency signal is mixed down the 96M analog intermediate frequency signal, for subsequent operation provides signal source; The A/D module adopts the 122.88M sample rate, receives analog intermediate frequency signal from frequency mixing module, and the analog-signal transitions that receives is become digital medium-frequency signal, for the post-digital signal processing provides digital signal; The DDC module may be made up of each carrier wave from the digital medium-frequency signal that the A/D module receives, the DDC module, and the DDC module is transformed into the zero intermediate frequency digital signal with each carrier signal; Baseband processing module, being used for extracting frequency from the zero intermediate frequency digital signal of DDC module is 283 carrier wave sequence.And handle to received signal by receiving filter.
Be understandable that, for a person skilled in the art, technical scheme of the present invention and inventive concept be equal to replacement or change the protection range that all should belong to the appended claim of the present invention.
Claims (4)
1. cdma system PN biasing acquisition methods, it is characterized in that: the PN sequence offset amount PILOT_MEASURE that receiving terminal obtains by matched filter is set, this parameter is made up of the chip offset that PN biasing and PN short code caused in time of time of space transmission and hardware handles, obtains pilot offset increment PI LOT_INC; PN biasing in base station is calculated by following formula and is obtained:
Wherein
For rounding operation, PILOT_INC is a cdma system pilot offset increment, is the cdma system given value, obtains from system.
2. cdma system PN biasing acquisition methods according to claim 1, it is characterized in that: it is as follows that described PN acquisition module obtains PN biasing step:
A, a carrier wave sequence top n sequence x (n) who from baseband processing module, obtains and the data input pin that moves into matched filter, N is the matched filter tap number;
Top n sequence in b, the PN memory module in the local PN sequence moves into matched filter, and simultaneously, local sequence cycles moves to left one;
C, do convolution algorithm, promptly be equivalent to carry out related operation, and preserve the shift count of operation result and local sequence by matched filter;
If the operation result value of d c step equals N or local sequence is finished the one-period circulation, then carry out the operation of e step, otherwise, carry out the operation of c step;
If e c step operation end value equals N, obtain shift count, carry out the operation of g step; If local sequence is finished the one-period circulation, then carry out the operation of f step;
This operation result of N of f, comparison c step is got maximum, and shift count when obtaining maximum, carries out the operation of g step;
G, obtain shift count, obtain the PN deviant;
H, obtain the PN side-play amount of received signal by the PN acquisition module, by the PN biasing that (5) formula calculates received signal, PILOT_MEASURE is the PN side-play amount that obtains in the g step in the formula.
3. cdma system PN biasing deriving means, it is characterized in that: comprise Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module, Anneta module, following frequency mixing module, the A/D module, the DDC module, baseband processing module and PN acquisition module are serially connected successively, the PN acquisition module comprises PN sequence memory module, matched filter module and signal processing module, the output of baseband processing module is connected with the input of matched filter module, the output of matched filter module is connected with the input of signal processing module, and PN sequence memory module is connected with matched filter module.
4. cdma system PN biasing deriving means according to claim 3, it is characterized in that: described Anneta module is used for the base station side received signal; Following frequency mixing module, the radiofrequency signal that is used for receiving from antenna becomes intermediate-freuqncy signal; The A/D module is used for receiving analog intermediate frequency signal from following frequency mixing module, and the analog-signal transitions that receives is become digital medium-frequency signal; The DDC module is used for each carrier signal is transformed into the zero intermediate frequency digital signal; Baseband processing module is used for extracting a carrier wave sequence from the zero intermediate frequency digital signal of DDC module, and by receiving filter this carrier wave sequence is handled.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102857330A (en) * | 2012-08-02 | 2013-01-02 | 奥维通信股份有限公司 | Base station locking system and base station locking method for code division multiple access (CDMA) 2000 evolution data only (EVDO) |
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| CN1302492A (en) * | 1999-04-29 | 2001-07-04 | 三星电子株式会社 | Apparatus and method for synchronizing channels in a W-CDMA communication system |
| CN101699773A (en) * | 2009-11-10 | 2010-04-28 | 京信通信系统（中国）有限公司 | Downstream synchronic PN code capturing method for CDMA 2000 1x EV-DO system |
| US20100202404A1 (en) * | 2007-10-26 | 2010-08-12 | Zte Corporation | Method and system for implementing hard handovers between access networks |
| CN201976098U (en) * | 2011-04-15 | 2011-09-14 | 三维通信股份有限公司 | PN (pseudo noise) offset obtaining device of CDMA (code division multiple access) system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302492A (en) * | 1999-04-29 | 2001-07-04 | 三星电子株式会社 | Apparatus and method for synchronizing channels in a W-CDMA communication system |
| US20100202404A1 (en) * | 2007-10-26 | 2010-08-12 | Zte Corporation | Method and system for implementing hard handovers between access networks |
| CN101699773A (en) * | 2009-11-10 | 2010-04-28 | 京信通信系统（中国）有限公司 | Downstream synchronic PN code capturing method for CDMA 2000 1x EV-DO system |
| CN201976098U (en) * | 2011-04-15 | 2011-09-14 | 三维通信股份有限公司 | PN (pseudo noise) offset obtaining device of CDMA (code division multiple access) system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857330A (en) * | 2012-08-02 | 2013-01-02 | 奥维通信股份有限公司 | Base station locking system and base station locking method for code division multiple access (CDMA) 2000 evolution data only (EVDO) |
| CN102857330B (en) * | 2012-08-02 | 2015-03-25 | 奥维通信股份有限公司 | Base station locking system and base station locking method for code division multiple access (CDMA) 2000 evolution data only (EVDO) |
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Application publication date: 20110831 |