Commonwealth Scientific and Industrial Research Organisation

John David Bunton

Valeriy Dyadyuk

Xiaojing Huang

Yingjie Jay Guo

Joseph Abraham Pathikulangara

Graham Ross Daniels

Colin Eric Jacka

Boyd McGregor Murray

David Andrew Abbott

Boyd Mcgregor Murray

Disclosed is a hybrid antenna array () comprising a plurality of digital branches (), each digital branch including an analogue beamforming sub-array (e.g.-), each sub-array having a plurality of antenna elements (), a phase shifter () adapted to apply a phase shift to the signal from each antenna element, and a combiner (e.g.-) adapted to combine the phase-shifted signals. Each digital branch also includes a signal chain (e.g.-) adapted to convert the output of the sub-array to baseband. The hybrid antenna array also comprises a digital processing module (), including: an angle of arrival estimation sub-module () adapted to estimate an angle of arrival of a signal at the antenna elements; a phase control sub-module () adapted to control the phase shift applied by each phase shifter depending on the estimated angle of arrival; and a digital beamformer () adapted to combine the baseband signals from the digital branches using a weight vector to form an output signal ().

Hybrid adaptive antenna array

A circuit for transmission and reception of multi-channel communications is disclosed. The transmitter path includes a digital modulation circuit receiving multiple channel binary data, and for each channel generating a digital representation of the data. A digital-to-analogue (D/A) conversion circuit (-) is provided for each data channel. Each D/A conversion circuit receives and converts respective channel digital representations to produce a resultant band limited analogue signal (-). The band limitation arises due to a characteristic of said channel digital representations. A bandpass filter (-) receives and filters each analogue channel signal. The band width to the start of the stop band of each bandpass filter is wider than a respective band limited analogue channel signal and wider than the Nyquist bandwidth arising from the sampling rate of said D/A conversion circuit. In this way, signal power in unwanted Nyquist zones is effectively removed. A frequency translation circuit (-) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.

Wireless frequency-domain multi-channel communications

A communications system, including at least one base station () at the surface, at least one repeater station () below the surface, and at least one mobile station () below the surface, the stations () establishing a bidirectional communications path between the mobile station () and the base station ().

Communications system

Growing community of inventors

St Clair, Australia

John David Bunton