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Method of time space solution for estimating wave diretion of maultiple paths signals in correlative CDMA and its device

A technology of direction of arrival estimation and multipath signal, which is applied in the field of code division multiple access CDMA cellular communication system, and can solve the problem that the array antenna CDMA system cannot be directly applied.

Inactive Publication Date: 2005-06-22
BEIJING JIAOTONG UNIV
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Problems solved by technology

There are usually dozens of users in a typical cell, and the signal of each user will generate multiple subpaths, so the traditional DOA estimation method based on antenna array cannot be directly applied to the array antenna CDMA system

Method used

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  • Method of time space solution for estimating wave diretion of maultiple paths signals in correlative CDMA and its device
  • Method of time space solution for estimating wave diretion of maultiple paths signals in correlative CDMA and its device
  • Method of time space solution for estimating wave diretion of maultiple paths signals in correlative CDMA and its device

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Embodiment Construction

[0120] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0121] The method according to the invention is applicable to any CDMA mobile communication system using array antennas.

[0122] figure 1 A schematic diagram of the detailed structure of the device applied to the array antenna direct-sequence spread spectrum code division multiple access DS-CDMA mobile communication system is given.

[0123] The device includes: a space-time decorrelation processor A of the user multipath signal and a user multipath signal direction of arrival estimator B. The input terminal of the space-time decorrelation processor A is connected to the input of the baseband sampling signal, and the space-time The output of the decorrelation processor A is connected to the input of the user multipath signal direction of arrival estimator B.

[0124] Space-time decorrelation processor A includes user multipath signal separation and calcula...

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Abstract

A space-time decorrelation method and device for estimating the direction of arrival of code division multiple access multipath signals. Firstly, the matched filter bank connected to the array antenna elements is used to separate the user multipath signals and calculate the matched filter in the asynchronous multipath channel. The output of the filter group, followed by space-time joint decorrelation processing on the output of the matched filter group, and then using the user decoupling multipath signal to estimate the covariance matrix of the user multipath signal, and then performing the calculation of the eigendecomposition of the covariance matrix, Finally, the direction-of-arrival estimation of user multipath signals based on principal eigenvectors is realized. The device includes two parts: a space-time decorrelation processor (A) for user multipath signals and a direction-of-arrival estimator (B) for user multipath signals. The method and device are very suitable for accurate estimation of direction of arrival of user multipath signals in an array antenna CDMA system using space-time decorrelation detection technology.

Description

technical field [0001] The invention belongs to the field of code division multiple access CDMA cellular communication system. Background technique [0002] CDMA cellular communication technology has shown great development potential due to its simple frequency planning, large system capacity, strong anti-multipath ability, good communication quality, and low electromagnetic interference. It is the mainstream technology of future mobile communication. Especially if the array antenna is used in the CDMA system, the capacity, spectrum efficiency, communication quality and coverage of the system can be significantly improved and high-precision wireless positioning services can be provided. In the array antenna CDMA system, the direction of arrival estimation of user multipath signals plays an important role in downlink beamforming, interference reduction and user wireless positioning technology based on angle estimation, and is one of the key technologies in the array antenna C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H01Q21/00H04B7/26
Inventor 杨维陈俊仕谈振辉程时昕
Owner BEIJING JIAOTONG UNIV
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