Interference management, handoff, power control and link adaptation in distributed-input distributed-output (DIDO) communication systems
First Claim
1. A system comprising a plurality of distributed transmitting antennas that transmit radio frequency (RF) signals to create locations in space with zero RF energy.
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Abstract
A system and method are described herein employing a plurality of distributed transmitting antennas to create locations in space with zero RF energy. In one embodiment, when M transmit antennas are employed, it is possible to create up to (M−1) points of zero RF energy in predefined locations. In one embodiment of the invention, the points of zero RF energy are wireless devices and the transmit antennas are aware of the channel state information (CSI) between the transmitters and the receivers. In one embodiment, the CSI is computed at the receivers and fed back to the transmitters. In another embodiment, the CSI is computed at the transmitter via training from the receivers, assuming channel reciprocity is exploited. The transmitters may utilize the CSI to determine the interfering signals to be simultaneously transmitted. In one embodiment, block diagonalization (BD) precoding is employed at the transmit antennas to generate points of zero RF energy.
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Citations
26 Claims
- 1. A system comprising a plurality of distributed transmitting antennas that transmit radio frequency (RF) signals to create locations in space with zero RF energy.
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14. A machine-implemented method comprising:
transmitting radio frequency (RF) signals from a plurality of antennas to create locations in space with zero RF energy. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification