Radio with spatially-offset directional antenna sub-arrays

Abstract

An intelligent backhaul radio that has an advanced antenna system for use in PTP or PMP topologies. The antenna system provides a significant diversity benefit. Antenna configurations are disclosed that provide for increased transmitter to receiver isolation, adaptive polarization and MIMO transmission equalization. Adaptive optimization of transmission parameters based upon side information provided in the form of metric feedback from a far end receiver utilizing the antenna system is also disclosed.

1 . A radio comprising:
 one or more demodulator cores, wherein each demodulator core is configured to demodulate at least one receive symbol stream;   a plurality of receive radio frequency (RF) chains, wherein each receive RF chain is configured to convert from a receive RF signal to a receive chain output signal;   one or more modulator cores, wherein each modulator core is configured to produce at least one transmit symbol stream;   a plurality of transmit radio frequency (RF) chains, wherein each transmit RF chain is configured to convert from a transmit chain input signal to a transmit RF signal;   a first directional antenna array comprising a plurality of first directional antenna sub-arrays, wherein each first directional antenna sub-array comprises a plurality of first directional antenna elements, and wherein each first directional antenna sub-array is coupled or couplable to at least one of the plurality of receive RF chains; and   a second directional antenna array comprising a plurality of second directional antenna sub-arrays, wherein each second directional antenna sub-array comprises a plurality of second directional antenna elements, and wherein each second directional antenna sub-array is coupled or couplable to at least one of the plurality of transmit RF chains;   wherein at least one first directional antenna sub-array is spatially offset relative to at least one other first directional antenna sub-array in a first arrangement; and   wherein said at least one first directional antenna sub-array is also spatially offset relative to at least one second directional antenna sub-array in a second arrangement.