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Device and method for multiuser detection in DS-CDMA system

A technology of multi-user detection and code division multiple access, which is applied to the device and field of multi-user detection in a direct sequence code division multiple access system, and can solve problems such as difficulties

Inactive Publication Date: 2004-01-21
LG INFORMATION & COMM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] In any case, due to the rapid change of the cross-correlation coefficient matrix with time in the background technology, the weighted value W is calculated on the basis of the minimum mean square error again 0 , W 1 , W 2 , such as systems using long codes

Method used

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  • Device and method for multiuser detection in DS-CDMA system
  • Device and method for multiuser detection in DS-CDMA system
  • Device and method for multiuser detection in DS-CDMA system

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Embodiment Construction

[0037] Preferred embodiments of the present invention will now be described with reference to the detailed construction in the accompanying drawings, examples of which are illustrated. image 3 It is a schematic block diagram illustrating the multi-user detection device in the DS-CDMA system of the preferred embodiment of the present invention;

[0038] refer to image 3 And Fig. 4, according to the DS-CDMA system of the preferred embodiment of the present invention, multi-user detection device comprises:

[0039] Matched filter unit 20, despreading signals received from multiple users with multi-user spreading codes to restore information Y1, ..., Yk from multiple users; multiple access interference signal extraction section 21, which has cascaded approximate decorrelation detection devices 21' and 21", each of which spreads the output Y from the matched filter unit 20 with a spreading code and performs despreading and filtering, so as to extract the multi-access interference ...

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Abstract

Device and method for decorrelated multiuser detection in a DS-CDMA system, is disclosed, which allows real time removal of an MAI(Multiple Access Interference) occurred in the DS-CDMA system, the method including the steps of(a) receiving signals band spread by multiuser spreading codes transmitted from multiuser respectively and despreading the received signals with conjugate complexes of the multiuser spreading codes, to restore each of multiuser messages y, (b) spreading each of the multiuser messages with the multiuser spreading codes, summing, despreading with the conjugate complexes of the multiuser spreading codes, low pass filtering, and subtracting from the multiuser messages y under bit synchronization, for extracting multiple access interference signals Qy according to cross-correlation coefficients between the multiuser spreading codes contained in each of the messages y; for the first time, and (c) adding negative values of the multiple access interference signals Qy extracted in the step (b) to the multiuser messages y under bit synchronization, for restoring each of multiuser messages Z=(I-Q)y having the multiple access interference signals removed therefrom for the first time (where, Q denotes a matrix with its diagonal entries being 0 and the other entries being the cross-correlation coefficients between each of the multiuser spreading codes and I denotes an identity matrix with its diagonal entries being unity, Z=[Z1, - - - , ZK] and y=[y1, - - - , yK]).

Description

technical field [0001] The present invention relates to a device and a method for detecting multiple users in a DS-CDMA (Direct Sequence Code Division Multiple Access) system, in particular to a device and method for decorrelating a multi-user detection in a DS-CDMA system. Based on MAI (Multiple Access Interference) of DS-CDMA system. Background technique [0002] The DS-CDMA system is a system in which the transmitter uses a pseudo-noise (PN) code or a spread signal (code) assigned to each user one by one to identify among the users to generate direct-band extension to modulate and transmit information; the receiver receives For transmitted information, the signal with the spreading code is despread to recover the original transmitted information. Due to the many advantages of the DS-CDMA system, such as the powerful function of anti-multi-path attenuation, good use of audio power cycle, soft off-hook between base stations, strong anti-jamming ability, and repeated use of...

Claims

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Application Information

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IPC IPC(8): H04B1/7107
CPCH04B1/71075H04B1/7107H04J13/10H04L5/026H04B2201/7097
Inventor 徐景三
Owner LG INFORMATION & COMM LTD
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