CN100536377C - Method for allocating code channel - Google Patents
Method for allocating code channel Download PDFInfo
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- CN100536377C CN100536377C CNB2005100692906A CN200510069290A CN100536377C CN 100536377 C CN100536377 C CN 100536377C CN B2005100692906 A CNB2005100692906 A CN B2005100692906A CN 200510069290 A CN200510069290 A CN 200510069290A CN 100536377 C CN100536377 C CN 100536377C
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Abstract
The invention discloses a distribution method for code channel that includes the following steps: determining the distribution method and the maximum displacement window count of each village according to the system configuration; determining the quantity of basic midamble code according to the maximum displacement window count; distributing the channel estimating window that corresponds to channelizing code. The invention could save system resource, reliably realize ratio alteration problem and improve the combination detecting capability.
Description
Technical field
The present invention relates to code division multiple access (CDMA) system communication technology, be meant the method that a kind of code channel distributes especially.
Background technology
In existing time division duplex CDMA (TDD-CDMA) standard, 3 kinds of the code channel method of salary distribution: specific, default and common have been defined.Wherein, the specific mode is come corresponding relation between notification channel sign indicating number and the channel estimation window by high level; Default and common mode define corresponding relation between channel code and the channel estimation window according to the criterion of acquiescence.For these 3 kinds of methods of salary distribution, each sub-district only takies 1 basic midamble sign indicating number, and its each displacement window is corresponding with one or more channel codes, and these channel codes may have identical spread spectrum coefficient, also may have different spread spectrum coefficients.
In communication process, high level tells the distribution condition of desired user to receiving terminal the receiver of receiving terminal is realized Multiuser Detection according to these information.Wherein, for up, described desired user is that all are just at communication user; For descending, desired user only refers to the user of receiver correspondence itself; Described distribution condition is meant the maximum number of the method for salary distribution, channel estimation window and the channel code of this CU, i.e. spreading code.Sending under the code channel situation identical with distributing code channel, Multiuser Detection can obtain effect preferably; Yet, sending under the code channel situation different with distributing code channel, promptly under the situation of variable Rate business, because receiver can not be known the transmission code channel information exactly, it is very difficult that Multiuser Detection just becomes.
Referring to shown in Figure 1, counting K=16 with the maximum displacement window of default mode, each sub-district is that example illustrates this problem.Suppose that certain user has been assigned with m
(1)-c
4 (1)Code channel, and in actual transmission the once, that the opposite end sends is m
(1)-c
16 (1)Code channel.Receiving terminal is detecting m
(1)After, only know that its correspondence the c that is that distributes
4 (1), and that do not know actual transmission is c
16 (1)If receiving terminal is directly according to the code channel c that distributes
4 (1)Go to carry out Multiuser Detection, 3 empty code channels introducing corresponding to spread spectrum coefficient 16 are disturbed, make the Multiuser Detection performance obviously reduce, amount of calculation also obviously increases.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of code channel distribution method, solves Multiuser Detection problem under the variable Rate situation, improves the performance of Multiuser Detection, simplifies amount of calculation.
Based on above-mentioned purpose, a kind of code channel distribution method provided by the invention comprises:
A) determine the maximum displacement window number of the code channel method of salary distribution and each sub-district according to system configuration;
B) determine the number of required basic midamble sign indicating number according to the maximum displacement window number of each sub-district;
C) be the channelization code allocation channel estimation window, make each channel estimation window corresponding one by one with channel code;
D) channel estimation window and the corresponding relation of determining between the channel code is kept at transmitting terminal and receiving terminal.
The described code channel method of salary distribution of this method is specific or default or common mode.
The described maximum displacement window of this method number K is the even number between 2～16.
Guarantee in the described deterministic process of this method step b that basic midamble sign indicating number has cycle auto-correlation and periodic cross-correlation performance.
This method determines that in step b basic midamble sign indicating number number is for adopting minimum basic midamble number of codes under the situation that is satisfying channel estimation window and the unique correspondence of channel code.
From above as can be seen, code channel distribution method of the present invention has unique corresponding relation by divide timing to make at code channel between channel estimation window and the channel code, make receiving terminal after obtaining channel estimation window, just can correspond to the code channel of actual transmission exactly, and utilize these code channels to go to carry out Multiuser Detection; Do not need to know user's assignment information, just can realize the Multiuser Detection of variable Rate business exactly; And a plurality of basic midamble sign indicating number that adopts when sending has cycle auto-correlation and periodic cross-correlation performance preferably.Thereby need not the assignment information that high level is notified the user, saved system resource; Can realize professional variable Rate problem reliably; Improve the performance of joint-detection.
Description of drawings
Fig. 1 is the code channel method of salary distribution schematic diagram of existing standard under default mode, the K=16 situation;
Fig. 2 is the code channel distribution method schematic flow sheet of preferred embodiment of the present invention;
Fig. 3 is for utilizing the code channel method of salary distribution schematic diagram of 2 basic midamle sign indicating numbers under the default mode of preferred embodiment of the present invention, the K=16 situation;
Fig. 4 is for utilizing the code channel method of salary distribution schematic diagram of 5 basic midamle sign indicating numbers under the default mode of preferred embodiment of the present invention, the K=16 situation;
Fig. 5 is for utilizing the code channel method of salary distribution schematic diagram of 4 basic midamle sign indicating numbers under the default mode of preferred embodiment of the present invention, the K=8 situation;
Fig. 6 utilizes code channel allocative decision of the present invention to realize the schematic flow sheet of Multiuser Detection.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Core concept of the present invention is: utilize a plurality of basic midamble sign indicating numbers, make to have unique corresponding relation between channel estimation window and the channel code.Like this, receiving terminal just can be corresponded to the channel code of actual transmission by channel estimation window exactly after detecting channel estimation window, thereby utilizes the code channel of this channel code to go to carry out Multiuser Detection.
Referring to shown in Figure 2, be example with default mode, K=16 below, code channel distribution method of the present invention is elaborated.
Here to count K be 16 to the maximum displacement window of each sub-district of Que Dinging.
By K=16 as can be known, the quantity of channel code mostly is 2 most
4+ 2
3+ 2
2+ 2
1+ 2
0=31, and 1 basic midamble sign indicating number maximum can identify 16 different channel estimation windows, therefore if make channel estimation window corresponding one by one with channel code, the number of the basic midamble sign indicating number that is then adopted should be more than 2 or 2.
In the selection of carrying out a plurality of basic midamble sign indicating numbers, require to guarantee that these basic midamble sign indicating numbers have cycle auto-correlation and periodic cross-correlation performance preferably.
And, determine the minimum basic midamble number of codes of basic midamble sign indicating number number under the situation that satisfies channel estimation window and the unique correspondence of channel code, adopting.
Therefore the number of basic midamble sign indicating number can be defined as 2 here.
This step can describe in conjunction with Walsh shown in Figure 3 (walsh) branched structure, and Fig. 3 utilizes 2 basic midamble sign indicating number m for the present invention
1And m
2A preferred embodiment of code channel allocative decision.
By order from subprime directory to higher level's catalogue, at first be subprime directory, i.e. the frequency spreading code division allocating channel estimating window of level V catalogue will adopt the channel estimation window m of first basic midamble sign indicating number sign
1 (1)～m
1 (16)Distribute to spreading code c in order respectively
16 (1)～c
16 (16)
Then, be the frequency spreading code division allocating channel estimating window of fourth stage catalogue, will be with second basic midamble sign indicating number m
2The channel estimation window m of sign
2 (1)～m
2 (8)Distribute to spreading code c respectively
8 (1)～c
8 (8)
For the frequency spreading code division allocating channel estimating window of third level catalogue, with channel estimation window m
2 (9)～m
2 (12)Distribute to spreading code c respectively
4 (1)～c
4 (4)
For the frequency spreading code division allocating channel estimating window of second level catalogue, with channel estimation window m
2 (13)～m
2 (14)Distribute to spreading code c respectively
2 (1)～c
2 (2)
For the frequency spreading code division allocating channel estimating window of first order catalogue, with channel estimation window m
2 (15)Distribute to spreading code c
1 (1)
Finally obtain as shown in Figure 3 channel estimation window and the one-to-one relationship between the channel code.
Shown in Figure 3 just one for example, when setting up each channel estimation window and channel code one-to-one relationship, the channel code of each channel estimation window correspondence can be specified arbitrarily.
Wherein, in the allocation order described in the step 203 just for example, also can adopt other order, such as: by order from higher level's catalogue to subprime directory.
If the number of the basic midamble sign indicating number of determining in step 202 is 5, the walsh branched structure that then adopts code channel allocative decision acquisition of the present invention is referring to shown in Figure 4.Wherein, channel estimation window m
1 (1)～m
1 (16)Distribute to spreading code c respectively
16 (1)～c
16 (16), channel estimation window m
2 (1)～m
2 (8)Distribute to spreading code c respectively
8 (1)～c
8 (8), channel estimation window m
3 (1)～m
3 (4)Distribute to spreading code c respectively
4 (1)～c
4 (4), channel estimation window m
4 (1)～m
4 (2)Distribute to spreading code c respectively
2 (1)～c
2 (2), channel estimation window m
5 (1)Distribute to spreading code c
1 (1)This allocative decision makes to have unique corresponding relation between each channel estimation window and each channel code equally.
For the situation of default mode, K=8, the walsh branched structure that adopts code channel allocative decision acquisition of the present invention is referring to shown in Figure 5.Fig. 5 shows the code channel allocative decision of utilizing 4 basic midamble sign indicating numbers.Wherein, channel estimation window m
1 (1)～m
1 (8)Distribute to spreading code c respectively
16 (1)～c
16 (8), channel estimation window m
2 (1)～m
2 (8)Distribute to spreading code c respectively
16 (9)～c
16 (16), channel estimation window m
3 (1)～m
3 (8)Distribute to spreading code c respectively
8 (1)～c
8 (8), channel estimation window m
4 (1)～m
4 (4)Distribute to spreading code c respectively
4 (1)～c
4 (2), channel estimation window m
4 (5)～m
4 (6)Distribute to spreading code c respectively
2 (1)～c
2 (2), channel estimation window m
4 (7)Distribute to spreading code c
1 (1)Thereby make and have unique corresponding relation between each channel estimation window and each channel code.
Utilize allocative decision of the present invention, the process of carrying out Multiuser Detection is referring to shown in Figure 6.
The signal that sends is received termination by the transmission at wireless channel and receives.
Step 405 is determined the channel code of these estimating window correspondences then according to the relation between channel code and the channel estimating displacement window.
The present invention is applicable to existing standard existing three kinds of method of salary distribution: specific, default, common.
The present invention is applicable to K configuration arbitrarily.
The present invention is applicable to the identical networking and the inter-frequency networking mode of cdma systems such as TDD-CDMA, and the up link of TDD-CDMA and down link.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, a kind of code channel distribution method is characterized in that, comprising:
A) determine the maximum displacement window number of the code channel method of salary distribution and each sub-district according to system configuration;
B) determine the number of required basic midamble sign indicating number according to the maximum displacement window number of each sub-district;
C) be the channelization code allocation channel estimation window, make each channel estimation window corresponding one by one with channel code;
D) channel estimation window and the corresponding relation of determining between the channel code is kept at transmitting terminal and receiving terminal.
2, method according to claim 1 is characterized in that, the described code channel method of salary distribution is specific or default or common mode.
3, method according to claim 1 is characterized in that, described maximum displacement window number K is the even number between 2～16.
4, method according to claim 1 is characterized in that, guarantees in the described deterministic process of step b that basic midamble sign indicating number has cycle auto-correlation and periodic cross-correlation performance.
5, method according to claim 1 is characterized in that, determines that in step b basic midamble sign indicating number number is for adopting minimum basic midamble number of codes under the situation that is satisfying channel estimation window and the unique correspondence of channel code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100692906A CN100536377C (en) | 2005-05-13 | 2005-05-13 | Method for allocating code channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100692906A CN100536377C (en) | 2005-05-13 | 2005-05-13 | Method for allocating code channel |
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| Publication Number | Publication Date |
|---|---|
| CN1863023A CN1863023A (en) | 2006-11-15 |
| CN100536377C true CN100536377C (en) | 2009-09-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938833B (en) * | 2009-06-29 | 2015-05-20 | 中兴通讯股份有限公司 | Logical resource identification distribution method and device |
| CN102036384A (en) * | 2009-09-29 | 2011-04-27 | 中兴通讯股份有限公司 | Training sequence code assignment method and system under multiuser multi-input multi-output (multiuser multi-input multi-output) mode |
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Address after: 201612 Shanghai Caohejing Songjiang hi tech park Xinzhuan Highway No. 518, building 6, room 101 Patentee after: Shanghai Ultimate Power Communication Technology Co., Ltd. Address before: 201700 Shanghai city Qingpu District No. 599 new road, building 3, No. 103 Patentee before: Shanghai Ultimate Power Communication Technology Co., Ltd. |