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Multiple user detection method and device, and self adaptive filter detector in it

A technology of multi-user detection and adaptive filtering, applied in the field of CDMA communication, can solve problems such as complex calculation

Inactive Publication Date: 2004-09-29
LG ELECTRONICS (CHINA) R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that the traditional multi-user detection method needs to know the spreading codes of other users, and requires complex calculations to complete the multi-user detection of user data

Method used

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  • Multiple user detection method and device, and self adaptive filter detector in it
  • Multiple user detection method and device, and self adaptive filter detector in it
  • Multiple user detection method and device, and self adaptive filter detector in it

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Embodiment Construction

[0040] In the notation used in the present invention, an underline under a variable indicates that the variable is a vector, while a "^" above a variable indicates that the variable is an estimated value.

[0041] figure 2 Shown is the functional block diagram of the sending end of the CDMA system. This is a synchronous downlink channel transmission model, and all bandpass signals are represented by equivalent complex baseband signals. Suppose there are K users communicating with the base station at the same time. The base station sends the data of K users on the downlink, and the user data can be expressed as d (k) , k=1,...,K. User data is spread by a specific spreading code before being sent, and the spreading code can be expressed as c d (k) , k=1,...,K. The spread-spectrum signals are sent at the same time, and the signals are received at the receiving end through the same channel. The impulse response of the channel can be expressed as h d (λ) . Suppose the...

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Abstract

This invention relates to a method for applying an adaptive filter to realize multiuser test in CDMA communication system including: estimating a channel character by a train sequence to process in the channel balance, taking spread spectrum cods and data information of other users as an independent part except the being tested users to finish the estimation to that part by the adaptive filter filtering the data of the test users to despread and judge the output after filtration. Advantage: multiuser test of user data can be effectively finished not necessary to know other users spread spectrum codes or complicated operation.

Description

technical field [0001] The present invention relates to the technical field of CDMA communication, more specifically, relates to an adaptive multi-user detection method and device in a CDMA communication system and an adaptive filter detection device used therein. Background technique [0002] Compared with the traditional FDMA and TDMA systems, the CDMA system has the advantages of high spectral efficiency, soft capacity, good security, easy seamless switching and macro diversity. However, in a complex mobile communication environment and limited frequency resources, to achieve high-capacity, high-quality, and high-speed communications, CDMA technology needs to overcome the influence of three factors: [0003] (1) Multiple access interference: In a CDMA system, due to the random access of multiple users, the orthogonality between user address codes cannot be guaranteed, thus causing multiple access interference. [0004] (2) Fading channel: When radio signals pass through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H03H21/00H04B1/707H04L25/03
Inventor 杨小勇任育松
Owner LG ELECTRONICS (CHINA) R&D CENT CO LTD