| 摘要 |
An apparatus comprises a plurality of antenna elements, a plurality of digital signal processing devices for supplying phase-and-amplitude-weighted digital baseband signals, a beamforming processor for processing the weighted digital baseband signals to adaptively form a plurality of beam patterns for the antenna elements, a plurality of digital modulators for converting the digital baseband signals into intermediate frequency digital signals, and a modulator for modulating in-phase and quadrature components of the intermediate frequency digital signals to produce composite radio frequency output signals for the antenna elements. Receiving apparatus, and methods of transmitting and receiving a plurality of signals on a plurality of antenna elements are also provided.
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