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Multipath searcher and method for direction of arrival estimation using multipath searcher

A multi-path search and direction-of-arrival technology, applied to electrical components, transmission control/equalization, radio transmission systems, etc., can solve problems such as low angular resolution and performance degradation, and achieve reduced calculations and improved angular resolution , the effect of improving the angular resolution

Inactive Publication Date: 2007-12-05
HUAWEI TECH CO LTD
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Problems solved by technology

This results in lower angular resolution in the direction of arrival and degrades performance in the uplink and downlink directions

Method used

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  • Multipath searcher and method for direction of arrival estimation using multipath searcher
  • Multipath searcher and method for direction of arrival estimation using multipath searcher

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Embodiment Construction

[0082] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0083] In the embodiment of the present invention, before the DOA is finally determined, the angle resolution of the DOA estimation is refined according to the obtained PDP, so that the DOA estimation with a higher resolution can be obtained. At the same time, the thinning process does not require a large amount of calculation, which reduces the amount of calculation.

[0084] FIG. 3 is a schematic structural diagram of a multipath searcher in a smart antenna according to an embodiment of the present invention. As shown in Figure 3, similar to the prior art, the multipath searcher includes multiple correlators, beamformers, PDP generators, averagers and delay selectors, since the functions of these units are different from those of the prior art The corresponding units are the same, so their detailed descriptions will be omitted hereinafter. Different ...

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Abstract

The present invention discloses a multi-path searcher, comprising: multiple correlators, for performing correlation of the known transmitted signal and the received signal for all delays within a certain search window for each antenna element, thereby generating M Complex Delay Profiles (CDPs), where M is the number of antenna elements; a beam former, for performing beam forming processing for CDPs from the correlators, and thus generating K beam formed CDPs, where K is the number of formed beams; a power delay profile (PDP) generator, for taking absolute square of each element of each CDP from the beam former, and thus forming K PDPs; a delay selector, for selecting candidate delays based on the power values for all delays in the search window and for all beams based on the PDPs from the PDP generator; and a refinement processing unit, for implementing a refinement processing for improving angular resolution of estimation values of direction of arrival for candidate delays obtained from the delay selector, and determining the result of said refinement processing as the final estimation values of direction of arrival. The present invention also discloses a method for direction of arrival estimation.

Description

technical field [0001] The invention relates to a smart antenna in a spread spectrum system, in particular to a multipath searcher and a method for estimating the direction of arrival using the multipath searcher. Background technique [0002] In recent years, with the development of mobile communication technology, smart antenna technology has been proposed and developed rapidly. In a smart antenna system, an array of smart antennas is used to receive and transmit signals in predetermined directions. By applying different weights to the antenna signals in the uplink direction, the signal from the target user is amplified, and the signal interference from other directions is suppressed at the same time. In the downlink direction, the weight is used to amplify the signal, and the transmission energy is directed to the target user, while reducing the interference of users located in other directions of the base station. [0003] The weights are usually given by a steering ve...

Claims

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Application Information

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IPC IPC(8): H04B7/005
CPCH04B7/0897H04B1/7113H04B1/7117
Inventor 奥斯卡・莫里兹魏立梅
Owner HUAWEI TECH CO LTD
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