US 2020/0091997 A1 · Ground Terminals via Remote Digital-Beam-Forming Networks for Satellites in Non-Geostationary Orbit

Abstract

A MIMO basestation for a cellular communications system comprises a remote indoor processing facility coupled to an outdoor RF tower via optical fibers. The remote indoor processing facility includes a bank of RF modulators to modulate signal streams; a remote MIMO transmitting processor that includes a remote digital beam-forming network to transform the modulated signal streams into transmit beam signals; a pre-processor to perform a wavefront multiplexing transform on the transmit beam signals to generate wavefront multiplexed beam signals, each of the wavefront multiplexed beam signals being a linear combination of the transmit beam signals; and RF-to-optical drivers to perform optical modulating functions on the wavefront multiplexed beam signals to generate optical waveform streams.

Claims20

Dependent claims

A MIMO basestation for a cellular communications system comprising:

a remote indoor processing facility comprising:
a bank of RF modulators configured to modulate signal streams;
a remote MIMO transmitting processor comprising a remote digital beam-forming network configured to receive the modulated signal streams and generate transmit beam signals;
a pre-processor configured to perform a wavefront multiplexing transform on the transmit beam signals to generate wavefront multiplexed beam signals, each of the wavefront multiplexed beam signals being a linear combination of the transmit beam signals;
and
RF-to-optical drivers configured to perform optical modulating functions on the wavefront multiplexed beam signals to generate optical waveform streams;
and
optical fibers configured to couple the RF-to-optical drivers to an outdoor RF tower.

5 more elements

A MIMO basestation for a cellular communications system comprising:

an outdoor RF tower comprising:
an array antenna having a plurality of receiving elements configured to capture signal streams from user transmit elements in a multipath propagation environment;
low noise amplifiers configured to amplify the captured signal streams;
analog-to-digital conversion blocks configured to convert the amplified signal streams to digital signal streams;
a pre-processor configured to perform a wavefront multiplexing transform on the digital signal streams, and generate wavefront multiplexed signal streams, each of the wavefront multiplexed signal streams being a linear combination of the digital signal streams;
and
RF-to optical drivers configured to perform optical modulating functions on the wavefront multiplexed signal streams to generate optical waveform streams;
and
optical fibers configured to couple the RF-to optical drivers to a remote indoor processing facility.

6 more elements

Dependencies are inferred from the claim text.

Ground Terminals via Remote Digital-Beam-Forming Networks for Satellites in Non-Geostationary Orbit

Life of this patent

Ground Terminals via Remote Digital-Beam-Forming Networks for Satellites in Non-Geostationary Orbit

Life of this patent

Abstract

Claims20