Systems and methods for radio frequency calibration exploiting channel reciprocity in distributed input distributed output wireless communications
First Claim
1. A multiple antenna system (MAS) with multiuser (MU) transmissions (“
- MU-MAS”
) comprising;
a plurality of wireless base transceiver stations (BTSs) and/or a centralized processor (CP);
a plurality of user equipment devices (UEs); and
a plurality of beacon stations;
the one or more BTSs and/or the centralized processor (CP) to estimate uplink (UL) channel state information (CSI) from UL signaling;
wherein one or more of the plurality of BTSs and beacon stations are configured to send a plurality of training signals between the BTSs and the beacon stations;
wherein one of more of the plurality of BTSs, the CP, and/or one or more beacon stations process the plurality of training signals to estimate a plurality of RF calibration coefficients;
wherein one or more of the plurality of BTSs, the CP, and/or one or more beacon stations use the plurality of RF calibration coefficients to precondition a matrix of UL CSI and obtain a matrix of downlink (DL) CSI;
one or more precoders of one or more of the plurality of BTSs, the CP, and/or one or more beacon stations to use the DL CSI for precoding radio signals which are simultaneously transmitted from the plurality of BTSs, the precoding to cause deliberate radio frequency interference to create concurrent, non-interfering enclosed shapes in space of coherent wireless signals around one or more antennas of one or more of the UEs; and
wherein the CP is to adapt the size of the enclosed shapes in space by selecting different subsets of the plurality of BTSs.
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Accused Products
Abstract
Systems and methods are described for radio frequency (RF) calibration in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) exploiting uplink/downlink channel reciprocity. The RF calibration is used to compute open-loop downlink precoder based on uplink channel estimates, thereby avoiding feedback overhead for channel state information as in closed-loop schemes. For example, a MU-MAS of one embodiment comprises a wireless cellular network with one or multiple beacon stations, multiple client devices and multiple distributed antennas operating cooperatively via precoding methods to eliminate inter-client interference and increase network capacity.
651 Citations
22 Claims
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1. A multiple antenna system (MAS) with multiuser (MU) transmissions (“
- MU-MAS”
) comprising;a plurality of wireless base transceiver stations (BTSs) and/or a centralized processor (CP); a plurality of user equipment devices (UEs); and a plurality of beacon stations; the one or more BTSs and/or the centralized processor (CP) to estimate uplink (UL) channel state information (CSI) from UL signaling; wherein one or more of the plurality of BTSs and beacon stations are configured to send a plurality of training signals between the BTSs and the beacon stations; wherein one of more of the plurality of BTSs, the CP, and/or one or more beacon stations process the plurality of training signals to estimate a plurality of RF calibration coefficients; wherein one or more of the plurality of BTSs, the CP, and/or one or more beacon stations use the plurality of RF calibration coefficients to precondition a matrix of UL CSI and obtain a matrix of downlink (DL) CSI; one or more precoders of one or more of the plurality of BTSs, the CP, and/or one or more beacon stations to use the DL CSI for precoding radio signals which are simultaneously transmitted from the plurality of BTSs, the precoding to cause deliberate radio frequency interference to create concurrent, non-interfering enclosed shapes in space of coherent wireless signals around one or more antennas of one or more of the UEs; and wherein the CP is to adapt the size of the enclosed shapes in space by selecting different subsets of the plurality of BTSs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- MU-MAS”
Specification