Abstract: Principles of quantum interferometry are used to create a signal architecture (known as carrier interferometry) for wireless and waveguide electromagnetic-wave communications. Carrier interferometry provides unprecedented bandwidth efficiency and enables substantial improvements in interference rejection, power efficiency, and system versatility. The carrier interferometry architecture also enables simpler transceiver designs that facilitate digital up-conversion and down-conversion.

Abstract: Spatial multiplexing techniques achieve substantial improvements in frequency reuse in microwave communications. The spatial demultiplexing techniques use amplitude and phase differences of received signals at spatially separated antennas to separate interfering signals. A set of complex weights is generated based on the differences of the received signals. The received signals are weighted and summed to cancel interference and separate the signals. Beamforming operations in an antenna array provide rejection of intersymbol interference and reduce the number of antennas needed to cancel interference. A spatial demultiplexing technique using multicarrier signals eliminates the requirement for multiple receiver antennas. The spatial demultiplexing technique is also applied to separating received signals that have polarization time, and frequency diversity.