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Correlating device allocation control procedue to allocate correlating device group

A correlator and controller technology, which is applied in the direction of code division multiplexing system, communication between multiple stations, digital transmission system, etc., can solve the problem of synchronous destruction of new users, and achieve the effect of shortening the time period

Inactive Publication Date: 2008-04-02
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional correlator allocation process also has a second problem, that is, if the number of subscribing users is small, and the correlator allocation process is modified to allocate all remaining redundant correlators, then when many new users are activated at once, these Synchronization between new users is broken

Method used

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  • Correlating device allocation control procedue to allocate correlating device group
  • Correlating device allocation control procedue to allocate correlating device group
  • Correlating device allocation control procedue to allocate correlating device group

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036] Fig. 2 is a block diagram of an arrangement of a CDMA receiver according to a first embodiment of the present invention. As shown in Figure 2, a CDMA receiver 10 includes a plurality of fingers 11 provided to each user 1 to 11 M , a searcher 12, a plurality of RAKE combiners 13 provided to each user 1 to 13 M and multiple decoders 14 provided to individual users 1 to 14 M .

[0037] Received data a of each user that has been input into the CDMA receiver 10 1 to a M is provided to refer to part 11 1 to 11 M and searcher 12. The searcher 12 slightly moves (shift) each user's received data a 1 to a M Determine the correlation value level at the same time as the despreading time, search for the best receiving timing, and at the peak timing of each user b 1 to b M Pointing to part 11 1 to 11 M Fingers #1 to #n in each of the indicated finger parts 11 1 to 11 M Receive timing of received data.

[0038] Refers to part 11 1 to 11 M provided to each user. Fo...

no. 2 example

[0056] A second embodiment of the present invention will be specifically described below with reference to FIGS. 10 and 11 .

[0057] Fig. 10 is a block diagram showing details of a searcher according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in that when the shared correlator number calculator 25 calculates the number of shared correlators allocated to users from the number of subscribed users and the total number C of shared correlators 42, the reception the quality of the data.

[0058] Subscriber number measuring unit 24 counts the number of subscribed users, and also has a user number measuring unit 81 for counting the number of users whose received data quality is lower than a threshold value. The user number measuring unit 81 counts the number of users whose reception data quality is lower than a threshold value based on the quality of reception data received by the users. If the number of users whose rece...

no. 3 example

[0065] A third embodiment of the present invention will be specifically described below with reference to FIGS. 12 and 13 .

[0066] Fig. 12 is a block diagram of details of a searcher according to a third embodiment of the present invention. The third embodiment differs from the first embodiment in that the shared correlator number calculator 25 considers the cell when calculating the number of shared correlators allocated to users from the number of subscribed users and the number C of shared correlators 42 The size of the radius.

[0067] Subscriber number measuring unit 24 counts the number of subscribed users, and also has user number measuring unit 101 for counting the number of users whose cell radius size is equal to or larger than a threshold value. The user number measuring unit 101 counts the number of users whose cell radius size is equal to or greater than a threshold value based on the cell radius of the users. If the number of users whose cell radius size is e...

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PUM

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Abstract

The invention relates to a correlator allocation control process for correlator set divided into shared correlators and dedicated correlators. A delay profile calculator comprises dedicated correlators and shared correlators, and calculates the numbers of shared calculators allocated to respective users from the number of subscribing users and the total number of shared correlators. If the number of subscribing users is small, i.e. if there are excessive correlators, then it is possible to increase the number of correlators allocated to a user.

Description

technical field [0001] The invention relates to a CDMA receiver and a correlator allocation control method in a CDMA mobile communication system, more specifically, relates to a CDMA receiver and a correlator allocation control method capable of improving the accuracy of tracking paths. Background technique [0002] The previously known CDMA receiver includes a finger assembly and a searcher, the searcher has a correlator group, an adder group and a path controller, and the path controller is used to search for a high value from the accumulated correlation values. level reception timing, and determine the reception timing at which the signal is received by the finger unit. [0003] Figure 1 of the accompanying drawings illustrates an example of a correlator allocation scheme in a conventional delay profile calculator. In FIG. 1 , the number of correlators 71 allocated to one user is four, and the maximum number M of subscribing users is four. As shown in Fig. 1, according ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B1/707H04L7/00H04J13/02H04B1/709H04B1/7113
CPCH04B1/709H04B1/7113H04B1/7117
Inventor 平出静
Owner NEC CORP