CN1738470A - Method for increasing band availability ratio using array space division character - Google Patents

Method for increasing band availability ratio using array space division character Download PDF

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CN1738470A
CN1738470A CN 200410009432 CN200410009432A CN1738470A CN 1738470 A CN1738470 A CN 1738470A CN 200410009432 CN200410009432 CN 200410009432 CN 200410009432 A CN200410009432 A CN 200410009432A CN 1738470 A CN1738470 A CN 1738470A
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user
sub cell
array
band efficiency
cell
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CN100393161C (en
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曾召华
陈林江
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ZTE Corp
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Abstract

The invention discloses a method for using the spatial character of array to improve the availability ratio of wave band, comprising following steps: dividing the 360 degree omnidirectional section covered by round array into several subsections according to the array ability of base station; setting the direction of user incoming wave relative to each said subsection as disclosed in the specificatoin, wherein n means the integer which is larger than 2; arranging one disturbing code and one basic training sequence code to each said subsection; generating the physics channel resource for all the users of each time slot of each said of each said subsection; operation the subsection emodulation on the array received signal. The invention can significantly improve the user capacity of wireless communication network system and improve the availability ratio of wave band.

Description

A kind of method of utilizing the sky branch characteristic raising band efficiency of array
Technical field
The present invention relates among the FDMA/TDMA/CDMA method that a kind of sky branch characteristic of utilizing array in the various communication systems improves the band efficiency of system, relate in particular to the method that the sky branch characteristic of utilizing array in WCDMA TDD and the TD-SCDMA mobile communication system improves the band efficiency of system.
Background technology
In existing all mobile communication system, normally utilize frequency division (FDMA), time-division (TDMA) or the sign indicating number of Radio Resource to divide the one or more combination of (CDMA) characteristic to constitute multi-address system, for a large amount of mobile subscribers provides service, as TACS (FDMA), GSM (FDMA/TDMA), IS-95 (FDMA/CDMA), WCDMA (FDMA/CDMA), TD-SCDMA (FDMA/TDMA/CDMA).In a sub-district, the Radio Resource that different user occupied is definitely can not be all identical, has so just greatly limited the band system band utilance, has limited user capacity in the unit frequency band.But also can see that any way that can introduce the Radio Resource autonomous behavior all will be brought apparent acute raising of band efficiency simultaneously, owing to adopt the mode Resources allocation of FDMA/TDMA/CDMA, its band efficiency will be far above other system as TD-SCDMA.
Along with the continuous maturation of intelligent antenna technology, the beam-forming technology with empty branch characteristic can dynamically be divided the sub-district (or fixing), forms the experimental process sub-district, and in these sub cells, three characteristics of existing Radio Resource can reuse.Particularly can dynamically adjust according to specific requirement (as traffic carrying capacity), have great flexibility based on the beam coverage (sub cell) of the formation of intelligent antenna technology; Can remedy simultaneously the problems such as pilot pollution that existing sector splitting technique is brought; Greatly reduce system cost, increased power system capacity, reduced system interference, increased the sub-district covering.
WCDMA TDD and TD-SCDMA mobile communication system are by the unique frame structure of design, and the dual-mode of employing TDD, for the successful realization of intelligent antenna technology has made up good physical basis, therefore intelligent antenna technology has become WCDMA TDD and the actual essential key technology of TD-SCDMA mobile communication system, but this does not influence the improvement of the present invention to other mobile communication system.
Document [1] has defined the data structure of the physical layer frame structure of existing TD-SCDMA system, corresponding time slot result and each burst.According to definition, on an existing carrier frequency point, the same scrambler of same cell configuration and a basic training sequence (are called for short: the Midamble sign indicating number), same time slot can only dispose 16 code channels (the previous time slot of order can only be supported the voice user of 8 12.2k at most, and same carrier wave is supported the voice user of 24 12.2k at most) at most.The Midamble sign indicating number that different user adopted on the same time slot is all produced after cyclic shift by basic Midamble sign indicating number, and corresponding channel estimation methods generally all is a utilization Steiner method of estimation [2], and it is a kind of low-cost channel estimation methods.For improving performance, in the document [3], a kind of noise reduction post-processing approach of crossing Threshold detection has been proposed, its basic thought is to estimate original channel impulse response with the Steiner method of estimation earlier, uses a thresholding then, removes most of noise tap.Document [4] has been explained the joint-detection demodulation techniques that adopted in the TD-SCDMA system in detail.
Wherein, document [1]: 3GPP TS 25.221: " Physical channels and mapping oftransport channels onto physical channels (TDD) ".
Document [2]: STEINER B, BAIER P.Low cost channel estimation in theuplink receiver of CDMA mobile radio systems, Frequenz, 1993,47 (12): 292-298.
Document [3]: Kang Shaoli, Qiu Zhengding etc., the improvement of low-cost channel estimation methods in the TD-SCDMA system, communication journal, 2002,23 (10): 125-130.
Document [4]: A.Clein " Zero Forcing and Minimum Mean-Square-ErrorEqualization for Multiuser Detection in Code-DivisionMultiple-Access Channels "
Summary of the invention
Technical problem to be solved by this invention has provided a kind of concrete wireless resource allocation method and corresponding demodulation techniques, has greatly improved the user capacity of wireless communication networks system, has improved band efficiency.
To achieve these goals, the invention provides a kind of method of utilizing the sky branch characteristic raising band efficiency of array, it is characterized in that, comprising:
Step 1 according to the array capability of base station, with justifying the sub cell that gust 360 ° of omni cell that cover split into a plurality of correspondences, makes arrival bearing user of each described sub cell correspondence be set to 0-α 1°, α 1°-α 2° ..., α N-1°-α n°, wherein, a 1°+α 2° ... + α N-1°+α n°=360 °, n=is greater than 2 integer, and is that each described sub cell distributes 1 scrambler and 1 basic training sequences sign indicating number;
Step 2 is for all users of each time slot in each described sub cell produce physical channel resources;
Step 3 is carried out the sub cell demodulation to the array element received signal.
The method of above-mentioned raising band efficiency, wherein, described step 2 comprises again: the main ripple arrival bearing according to user in the initial access process, judge the sub cell that this user belongs to; Produce training sequence, maximum user's number that basic training sequences sign indicating number that distributes according to each described sub cell and needs are admitted produces the training sequence of each user in the described sub cell; Distribute the physics code channel resource, according to the scrambler of each sub cell distribution, for this user distributes physical code channel unique, some;
To all sub cell user's data partly with the book cell allocation to scrambler carry out scrambling.
The method of above-mentioned raising band efficiency wherein, in the step that produces training sequence, adopts formula
Figure A20041000943200061
Calculate the long W of transmission channel window that the user distributes, utilize the Steriner technology to produce training sequence then for each user.
The method of above-mentioned raising band efficiency wherein, in the step of distributing the physics code channel resource, is the data structure of the physical layer frame structure according to the TD-SCDMASA system, corresponding time slot result and each burst, carries out the distribution of physical code channel resource.
The method of above-mentioned raising band efficiency, wherein, described step 3 comprises again:
Step a is weighted to the wave beam numeric field data to the array element data;
Step b to each wave beam numeric field data, therefrom isolates the training sequence received signal, and this described sub cell user is carried out channel estimating and channel post-processing;
Step c to each wave beam numeric field data, therefrom isolates the user data received signal, estimates the channel impulse response of book users of all cells then according to step b, then to book community user data demodulates;
Steps d is carried out the operation of step a-step c to all sub cells.
The method of above-mentioned raising band efficiency, wherein, described step a is the wave beam weight that has designed according to each sub cell, and the array received signal is weighted processing.
The method of above-mentioned raising band efficiency, wherein, described step b adopts Steriner channel estimating method and utilizes the setting noise gate to carry out the noise reduction reprocessing.
The method of above-mentioned raising band efficiency wherein, among the described step c of d, is to adopt joint-detection demodulation techniques or RAKE technology to this community user data demodulates.
The method of above-mentioned raising band efficiency, wherein, in step 1, the scrambler that distributes for each sub cell is identical with the basic training sequences sign indicating number, or inequality.
The method of above-mentioned raising band efficiency, wherein, in step 1, n=3 or 6.
Adopt the sub-district numeral distribution method that proposes based on the empty branch characteristic of array of the present invention, and based on the demodulation method of this distribution method correspondence, improved the flexibility that system has improved power system capacity and sub cell space greatly.
Description of drawings
The omni cell that Fig. 1 covers for the circle battle array splits into the schematic diagram (on average to be split into example, also can inhomogeneously dividing) of 3 sub cells;
Fig. 2 is that the training sequence of all users of each time slot in each sub cell produces schematic diagram;
Fig. 3 is an array element receiving signal demodulation flow chart.
Concrete implementation step
According to document [1], for any one communication frequency, configuration 1 downlink synchronous pilot frequency sign indicating number DwPTS, 8 uplink random access code UpPTS, a scrambler and basic Midamble sign indicating number in its cell parameter; Also have 3 scramblers and corresponding 3 basic Midamble sign indicating numbers not to distribute in fact.
The present invention utilizes the sky branch characteristic (or interference suppressioning characteristic) of array, a cell splitting is become several sub cells on the space, the sign indicating number resource of each sub cell is repeated configuration fully, also can be each sub cell 1 scrambler of configuration and 1 basic Midamble sign indicating number.In each sub cell, have only unique a scrambler and basic Midamble sign indicating number, the code channel number of each sub cell can be configured to 16 at most accordingly.
And corresponding demodulation method at first adopts the array weights that design, and array signal is weighted processing, promptly array element territory signal is become sub cell territory (being the wave beam territory) signal; Antithetical phrase zonule (being the wave beam territory) signal is according to document then [2]-document [4]The method of introducing is carried out data demodulates.
The invention discloses the sub-district numeral distribution method based on empty the branchs characteristic of array, and based on the demodulation method of this distribution method correspondence, it comprises the following steps (with circle gust is example, referring to Fig. 1):
The first step: according to the array capability of base station, can plan an omnidirectional (360 degree) cell splitting is become 3 (or 6 or other, with 3 is example) corresponding sub cell, arrival bearing user of each sub cell correspondence is the 0-120 degree, the 120-240 degree, the 240-360 degree is (for explanation needs, these sub cell numberings are followed successively by sub cell 1, sub cell 2, sub cell 3), (scrambler of different sub cells both can be identical with basic Midamble sign indicating number with 1 basic Midamble sign indicating number for each sub cell distributes 1 scrambler, also can be different, but in order to reduce the control complexity, a general configuration difference).
Second step: for all users of each time slot in each sub cell produce physical channel resources, this can be divided into following a few step again:
(1) at first according to the main ripple arrival bearing of user in the initial access process, judges the sub cell that this user belongs to;
(2) produce training sequence: maximum user's number K that basic Midamble sign indicating number that distributes according to each sub cell and needs are admitted produces the training sequence of each user in the sub cell.Promptly use formula Calculate the long W of transmission channel window that the user distributes, then according to document [2], for each user produces training sequence.
(3) distribute the physics code channel resource: the scrambler that distributes according to each sub cell, can according to the method for document [1] for this reason the user distribute physical code channel unique, some: at last the user's data of all sub cells part all need with the book cell allocation to scrambler carry out scrambling.
The 3rd step: the array element received signal is carried out demodulation, and this can be divided into following a few step again:
(1) the array element data are weighted to the sub cell data, i.e. the wave beam numeric field data: the wave beam weight that has designed according to each sub cell at first, the array received signal is weighted processing, promptly the array element data are weighted to sub cell data (being the wave beam numeric field data).
(2) to each sub cell data (being the wave beam numeric field data), therefrom isolate the training sequence received signal, then according to document [2]And document [3]The method of introducing is carried out channel estimating and channel post-processing to the book community user.
(3) to each sub cell data (being the wave beam numeric field data), therefrom isolate the user data received signal, estimate the channel impulse response of book users of all cells then according to (2), method or other method of introducing according to document [4] (as the RAKE technology) then is to book community user data demodulates.
(4), all carry out (1)-operation of (3) to all sub cells.
Said method mainly passes through design at WCDMA TDD and TD-SCDMA mobile communication system, certainly, also can carry out with reference to main thought of the present invention the improvement of other system.
In order to understand the present invention better, be described in further detail below in conjunction with the specific embodiment of accompanying drawing to technical scheme.
With reference to figure 1, for each sub cell distributes 1 scrambler and 1 basic Midamble sign indicating number (scrambler of different sub cells and basic Midamble sign indicating number both can be identical, also can difference, but in order to reduce the control complexity, a general configuration difference).
Main ripple arrival bearing according to user in the initial access process judges the sub cell that this user belongs to.Maximum user's number K that basic Midamble sign indicating number that distributes according to each sub cell and needs are admitted produces the training sequence of each user in the sub cell.Promptly use formula
Figure A20041000943200091
Calculate the long W of transmission channel window that the user distributes, as shown in Figure 2, for each user produces training sequence.
In Fig. 3, e carries out the sub cell demodulation to the array element received signal:
User data arrives receiver by spectrum-spreading and scrambling, air traffic channel, receives the superposed signal of 3 sub cells.Consider the noise and the interference that receive, write received signal as matrix form:
e k a = A 1 , k a d 1 + A 2 , k a d 2 + A 3 , k a + n k a
A I, ka, i=1,2,3; k a=1,2 ..., K aComprise respectively in the matrix 3 sub cells separately the spread spectrum scrambler and the information of channel impulse response; K aExpression one total K aIndividual antenna; d i, i=1,2,3 their transmission data of expression, n represents the noise that receiver receives.
At first, the wave beam weight w that has designed according to each sub cell I, ka, i=1,2,3, the array received signal is weighted processing, promptly the array element data are weighted to sub cell data e i(being the wave beam numeric field data),
e i = Σ k a = 1 K a w i , k a H e k a , i = 1,2,3
Because the wave beam weight of each sub cell contains the directional characteristic of this sub cell, therefore the data separating of this sub cell can be come out, suppressed the signal of other sub cells simultaneously.
Then,, therefrom isolate the training sequence received signal, finish the book community user is carried out channel estimating and channel post-processing each sub cell data (being the wave beam numeric field data),
h ^ i = G i - 1 · e i , i = 1,2,3
G i, i=1,2,3 matrixes are respectively by the ring shift right matrix of 3 basic training sequences sign indicating numbers (the Midamble sign indicating number distributes when producing physical channel resources for all users of each time slot in each sub cell) formation.
Set a noise gate T i, to what estimate Carry out channel post-processing, zero less than being changed to of decision threshold.With through channel post-processing
Figure A20041000943200096
To book community user data demodulates.With 3 sub cells separately the spread spectrum scrambler and the channel impulse response of reprocessing
Figure A20041000943200097
Generator matrix A i, data field is estimated with following formula:
d ^ i = ( A i H · A i ) - 1 A i H e i , i = 1,2,3
Thereby obtain each user's demodulating data.
Compared with prior art, the invention discloses a kind of sub-district numeral distribution method based on the empty branch characteristic of array, and based on the demodulation method of this distribution method correspondence, produce 6 fixed beams (6 sub cells) by 8 antennas circle battle array, the every time slot of each sub cell holds 4 12.2k voice users (maximum 8 12.2k voice users), then can hold 24 12.2k voice users (theoretically, can hold 48), its power system capacity is higher than 8 12.2k voice users' of existing every time slot level far away, has greatly improved the band efficiency of system.
The present invention is applicable to all FDMA/TDMA/CDMA systems, especially is applicable to WCDMA TDD and TD-SCDMA system in the present 3-G (Generation Three mobile communication system).But be understood that, though technical scheme of the present invention is primarily aimed at the wireless communication system of code division multiple access, but be applicable to the frequency division multiple access and the time-division multiple address system that adopt similar transmission structure too, any have a signal processing, the engineer of knowledge background such as communication, can design corresponding channel estimating apparatus according to the present invention, it all should be included in thought of the present invention and the scope.

Claims (10)

1, a kind of method of utilizing the sky branch characteristic raising band efficiency of array is characterized in that, comprising:
Step 1 according to the array capability of base station, with justifying the sub cell that gust 360 ° of omni cell that cover split into a plurality of correspondences, makes arrival bearing user of each described sub cell correspondence be set to 0-α 1°, α 1°-α 2° ..., α N-1°-α n°, wherein, α 1°+α 2° ... + α N-1°+α n°=360 °, n is the integer greater than 2, and is that each described sub cell distributes 1 scrambler and 1 basic training sequences sign indicating number;
Step 2 is for all users of each time slot in each described sub cell produce physical channel resources;
Step 3 is carried out the sub cell demodulation to the array element received signal.
2, the method for raising band efficiency according to claim 1 is characterized in that, described step 2 comprises again:
Main ripple arrival bearing according to user in the initial access process judges the sub cell that this user belongs to;
Produce training sequence, maximum user's number that basic training sequences sign indicating number that distributes according to each described sub cell and needs are admitted produces the training sequence of each user in the described sub cell;
Distribute the physics code channel resource, according to the scrambler of each sub cell distribution, for this user distributes physical code channel unique, some;
To all sub cell user's data partly with the book cell allocation to scrambler carry out scrambling.
3, the method for raising band efficiency according to claim 2 is characterized in that, in the step that produces training sequence, adopts formula Calculate the long W of transmission channel window that the user distributes, utilize the Steriner technology to produce training sequence then for each user.
4, the method for raising band efficiency according to claim 2, it is characterized in that, in the step of distributing the physics code channel resource, be the data structure of the physical layer frame structure according to the TD-SCDMASA system, corresponding time slot result and each burst, carry out the distribution of physical code channel resource.
5, the method for raising band efficiency according to claim 1 is characterized in that, described step 3 comprises again:
Step a is weighted to the wave beam numeric field data to the array element data:
Step b to each wave beam numeric field data, therefrom isolates the training sequence received signal, and this described sub cell user is carried out channel estimating and channel post-processing;
Step c to each wave beam numeric field data, therefrom isolates the user data received signal, estimates the channel impulse response of book users of all cells then according to step b, then to book community user data demodulates;
Steps d is carried out the operation of step a one step c to all sub cells.
6, the method for raising band efficiency according to claim 5 is characterized in that, described step a is the wave beam weight that has designed according to each sub cell, and the array received signal is weighted processing.
7, the method for raising band efficiency according to claim 5 is characterized in that, described step b adopts Steriner channel estimating method and utilizes the setting noise gate to carry out the noise reduction reprocessing.
8, the method for raising band efficiency according to claim 5 is characterized in that, among the described step c of d, is to adopt joint-detection demodulation techniques or RAKE technology to this community user data demodulates.
9, the method for raising band efficiency according to claim 1 is characterized in that, in step 1, the scrambler that distributes for each sub cell is identical with the basic training sequences sign indicating number, or inequality.
10, the method for raising band efficiency according to claim 1 is characterized in that, in step 1, and n=3 or 6.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007000079A1 (en) * 2005-06-28 2007-01-04 Zte Corporation A method for configuring and demodulating multiple scrambled codes in cdma system
CN103907369A (en) * 2013-12-09 2014-07-02 华为技术有限公司 Signal processing method and base station

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3685200A (en) * 1999-02-26 2000-09-14 Telefonaktiebolaget Lm Ericsson (Publ) Smart antenna beam assignment at mobile station hand-off
US6804214B1 (en) * 1999-04-19 2004-10-12 Telefonaktiebolaget Lm Ericsson (Publ) System and method for implementing multiple carriers in cellular networks

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007000079A1 (en) * 2005-06-28 2007-01-04 Zte Corporation A method for configuring and demodulating multiple scrambled codes in cdma system
CN103907369A (en) * 2013-12-09 2014-07-02 华为技术有限公司 Signal processing method and base station
WO2015085466A1 (en) * 2013-12-09 2015-06-18 华为技术有限公司 Signal processing method and base station
CN103907369B (en) * 2013-12-09 2018-06-05 华为技术有限公司 Signal processing method and base station
US10069556B2 (en) 2013-12-09 2018-09-04 Huawei Technologies Co., Ltd. Signal processing method and base station

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