Interference avoiding MIMO

An apparatus for transmitting a radio signal, comprising:

• a first plurality of weightable transceiving elements;
• and
• a processor configured to estimate a characteristic cij of a channel from element i of the first plurality of weightable transceiving elements to element j of a second plurality of weightable transceiving elements, for at least a portion of the first plurality of weightable transceiving elements and at least a portion of the second plurality of weightable transceiving elements;
• and to form a channel estimate matrix CA from the estimated characteristics cij based on at least one signal received from a second plurality of weightable transceiving elements by at least a portion of the first plurality of weightable transceiving elements, to calculate receiving weights for at least a portion of the first plurality of weightable transceiving elements, responsive to the channel estimate matrix, and to calculate transmitting weights for at least a portion of the first plurality of weightable transceiving elements.

A non-transitory computer readable medium comprising computer executable instructions for:

• estimating at least one characteristic of a radio channel from a first station comprising a first plurality of weightable transceiving elements, to a second station comprising a second plurality of weightable transceiving elements, wherein estimating the at least one characteristic includes estimating the characteristic cij of the radio channel from element i of the first plurality of weightable transceiving elements to element j of the second plurality of weightable transceiving elements, for at least a portion of the first plurality of weightable transceiving elements and at least a portion of the second plurality of weightable transceiving elements and forming a channel estimate matrix CA from the estimated characteristics cij that includes the estimate of the at least one characteristic;
• calculating a receive weighting of at least one weightable transceiving element at the second station, responsive to the estimate;
• calculating a transmit weighting of at least one weightable transceiving element at the first station;
• weighting the first plurality of weightable transceiving elements with the transmit weighting to form transmit-weighted transceiving elements at the first station;
• weighting the second plurality of weightable transceiving elements with the receive weighting to form receive-weighted transceiving elements at the second station;
• and
• controlling the communication of the radio signal comprising transmitting from the transmit-weighted transceiving elements at the first station, over the radio channel, to the receive-weighted transceiving elements at the second station.

A method of communicating a radio signal between a first station and a second station, comprising:

• estimating an interference condition for a signal transmitted from the first station, which comprises a first plurality of weightable transceiving elements, to the second station, which comprises a second plurality of weightable transceiving elements, the interference condition resulting from signals transmitted from the first station to the second station;
• calculating a receiving weight of one of the second plurality of weightable transceiving elements responsive to the estimated interference condition and an estimated channel condition of a signal channel from the first station to the second station;
• weighting the one of the second plurality of weightable transceiving elements;
• receiving a signal at the one of the second plurality of weightable transceiving elements from one of the first plurality of weightable transceiving elements;
• and
• receiving a second receiving weight from the first station, the second receiving weight based on a second estimated interference condition and an second estimated channel condition, where the second estimated interference condition and the second estimated channel condition are estimated based on signals transmitted from the second station to the first station.

A system comprising:

• a first plurality of weightable transceiving elements;
• and
• a processor configured to:
• estimate an interference condition for a signal transmitted from a station, which comprises a second plurality of weightable transceiving elements, to the first plurality of weightable transceiving elements, the interference condition resulting from signals transmitted from the station to the first plurality of weightable transceiving elements;
• and
• calculate a receiving weight of one of the first plurality of weightable transceiving elements responsive to the interference condition and an estimated channel condition of a signal channel from the station to the first plurality of weightable transceiving elements,
• wherein, the first plurality of weightable transceiving elements is configured to receive a second receiving weight from the station, the second receiving weight based on a second estimated interference condition and an second estimated channel condition, where the second estimated interference condition and the second estimated channel condition are estimated based on signals transmitted from the first plurality of weightable transceiving elements to the station.