Methods for spatial multiplexing of wireless two-way channels

A transceiver unit, comprising:

• a transmitter,
• a receiver;
• and
• a plurality of antennas, at least one of the plurality of antennas defining at least one transmit antenna and at least one of the plurality of antennas defining at least one separate receive antenna to enable simultaneous transmitting and receiving, overlapping in time and frequency, for a two-way communication with another communication device, the plurality of antennas configured and/or controlled using at least one of antenna design techniques comprising antenna selection and signal processing techniques to reduce self-interference between the at least one transmit antenna and the at least one separate receive antenna to maximize the signal-to-interference noise ratio, such that an amount of the signal-to-interference noise ratio at the at least one separate receive antenna is measured and maximized through at least one technique selected from:
• antenna design technique, comprising at least one of:
• shape/dimension, layout, orientation, placement of feed network, antenna selection, and antenna beam-forming;
• adaptive signal processing technique comprising interference cancellation, to process a block of data to exploit the non-causality to improve the performance of the interference canceller;
• and
• adaptive signal processing technique comprising combined demodulation, channel decoding and interference cancellation using an iterative decoding/demapping procedure to process a block of data to exploit non-causality to improve the performance of the interference cancellation;
• and
• wherein each transmit or receive antenna is split into multiple antennas each with a phase shift selected for reducing the amount of the self-interference;
• wherein the transmit and receive antennas comprise patch antennas placed on a same surface of one or more multi-layer printed circuit boards (PCBs) of the unit and wherein the unit further comprises respective feed networks for the transmit and receive antennas placed partially on the same surface as the patch antennas, partially on intermediate layers and partially on the other surface of the PCB for reducing the amount of self-interference;
• wherein said PCB layers are isolated through grounded planes of conducting material to reduce self-interference where such planes have holes to pass the respective feed networks across the layers of the PCB;
• wherein the layers of the PCB are made of one or more selected dielectric materials having one or more thicknesses for reducing the amount of self-interference;
• and wherein band gap material is used in the PCBs for reducing the amount of self-interference;
• and further wherein the transceiver unit comprises:
• a. a PCB comprising multiple layers of said dielectric material and band gap material sandwiching grounded planes of conductor material, said PCB defining connections between the layers for the conductor, said PCB comprising opposite top and bottom surfaces;
• b. two patch antennas defining transmit antennas having a 180 degree phase shift difference located on one of the opposite surfaces of the PCB;
• c. one patch antenna defining a receive antenna located on the same one opposite surface of the PCB in the middle of the two transmit antennas at the physical location of a transmit null;
• d. a transmit feed network located on the other of the opposite surfaces of the PCB or on a different layer of the PCB from said patch antennas;
• e. circuitry for the receive antenna, comprising low noise amplifiers (LNAs), located on the same one surface at the physical location of a local transmit null;
• and
• f. circuitry for the transmit antennas, comprising power amplifiers, located on the other of the opposite surfaces of the PCB.