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Method for estimating angle of arrival wave, and assigning form for wave packet

A beamforming and angle of arrival technology, applied in transmission control/equalization, diversity/multi-antenna system, space transmit diversity and other directions, can solve problems such as difficulty in adapting to changes in different propagation environments, and achieve the effect of improving performance

Inactive Publication Date: 2007-02-21
ZTE CORP
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Problems solved by technology

[0012] When calculating the recursive average value of the received power, if the forgetting factor is configured as a constant value, it is difficult to adapt to the changes in different propagation environments. At present, there is no method to realize the angle of arrival estimation and beamforming by adaptively adjusting the forgetting factor

Method used

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  • Method for estimating angle of arrival wave, and assigning form for wave packet
  • Method for estimating angle of arrival wave, and assigning form for wave packet
  • Method for estimating angle of arrival wave, and assigning form for wave packet

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Embodiment Construction

[0027] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The method for estimating the angle of arrival and beamforming of the present invention is a DOA estimation and beamforming method for adaptively adjusting the forgetting factor, which can adaptively adjust the forgetting of the recursive average as the actual channel propagation environment changes. factor, and realize uplink DOA estimation and downlink beamforming according to the recursive average of received power. The basic technical scheme of the inventive method comprises the following steps:

[0029] a. Calculate the covariance matrix of the antenna array channel estimation of each user according to the channel estimation of each user on each antenna;

[0030] b. Within the coverage angle range of the antenna array, calculate the instantaneous value of the uplink received power corresponding to each user in different direc...

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Abstract

In the invention, for the sub frame, repeat the following steps: according to the channel estimation of each user on each antenna, calculating the covariance matrix of antenna array channel matrix of each user; in the angular coverage of antenna array, calculating the uplink receiving power transients and the received power recursion average value; search the maximum value of the uplink received power recursion average value corresponding to each user; based on it, generating the downlink beam-forming weighted value to implement beam-forming; calculating the fluctuating value of the Direction of Arrival (DOA) estimation between neighboring subframes; according to the up and down threshold of the received power forgetting factor, using the fluctuating value of DOA estimation of each user to self adapt the corresponding forgetting factor.

Description

technical field [0001] The present invention relates to a method for estimating the angle of arrival (DOA, Direction Of Arrival) and beamforming, in particular to uplink DOA estimating and downlink using smart antenna technology in a Synchronous Code Division Multiple Access (CDMA) communication system Beamforming method. Background technique [0002] The existing smart antenna can realize uplink DOA estimation and downlink beamforming by using the spatial characteristics of signal transmission and digital signal processing technology, so as to reduce noise interference, increase capacity, expand coverage, improve communication quality, reduce The purpose of transmitting power and increasing the wireless data transmission rate. [0003] Under certain user moving speed conditions, for a synchronous CDMA communication system using time division duplex (TDD), its uplink and downlink channels meet the symmetrical requirements. If smart antennas are used, each user can be realiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/005
Inventor 秦洪峰卢勤博
Owner ZTE CORP
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