A smart antenna downlink wave bundle shaping method and its device

Abstract

The present invention relates to an intelligent antenna descending wave beam forming method and a device thereof, wherein the device comprises an antenna array (101), a multichannel amplifying unit (102), a multichannel transceiver unit (103), an ascending baseband processing unit (105) and the following components which are connected in sequence: a channel estimating and normalization processing unit (104), a space covariance matrix generating unit (106), a descending wave beam forming authority generating unit (107) and a descending wave beam forming unit (108). The method comprises the following procedures: setting a channel estimation window length W, and constructing each user ascending channel estimation matrix H(k); setting a channel tap power threshold PD and a channel tap number threshold ND, and combining the estimated channel tap power for real-time measuring P1(k) to obtain a power normalization ascending channel estimation matrix H(k) which satisfies the request of the channel tap; and calculating and generating a corresponding space covariance matrix R(k)=H(k)*(H(k))(H) and a descending wave beam forming authority vector w(k) according to that H(k) is not equal to 0 / M*w and forming, or generating a descending wave beam forming authority vector w(k)(t)=w(k)(t-1) according to H(k)=0 / M*w.

Description

technical field [0001] The present invention relates to mobile communication, in particular to a smart antenna downlink beam forming method and device thereof. Background technique [0002] Using the spatial characteristics of signal transmission and digital signal processing technology, smart antennas can realize weight vector estimation and downlink beamforming, so as to reduce interference, increase capacity, expand coverage, improve communication quality, reduce transmit power and improve wireless data transmission. speed purpose. [0003] Under certain user moving speed conditions, for a synchronous code division multiple access CDMA communication system using time division duplex TDD, its uplink and downlink channels meet the symmetrical requirements. If a smart antenna is used, it can receive signals according to the uplink corresponding to the antenna array Or channel estimation realizes the weight vector estimation of each user, and then completes downlink beamform...

AI Technical Summary

Problems solved by technology

However, the real-time adaptability of this method to wireless channel changes and the improvement of system performance are relatively limited, especially in complex propagation environments such as high-speed movement and multipath angle expansion, it is difficult to reflect the performance of smart antennas.

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