Distributed antenna system for MIMO signals
First Claim
1. A system comprising:
- a multiple-input and multiple-output (MIMO) base station configured to output a first branch of a MIMO signal and a second branch of the MIMO signal, the branches of the MIMO signal being in the same frequency channel and one of the branches including signaling parameters;
a hybrid coupler coupled to the MIMO base station, the coupler configured to receive the first branch of the MIMO signal and the second branch of the MIMO signal from the MIMO base station on respective first and second input ports and provide output signals on first and second output ports, the output signal on the first output port including at least a portion of the first branch of the MIMO signal and at least a portion of the second branch of the MIMO signal that is phase shifted orthogonally in relation to the respective second branch of the MIMO signal and the output signal on the second output port including at least a portion of the second branch of the MIMO signal and at least a portion of the first branch of the MIMO signal that is phase shifted orthogonally in relation to the respective first branch of the MIMO signal;
at least one master unit communicating with the coupler and configured to receive the output signal from the first output port of the coupler for distributing the output signal to one or more remote units;
at least another master unit communicating with the coupler and configured to receive the output signal from the second output port of the coupler for distributing the output signal to one or more remote units;
a plurality of remote units communicating with the at least one master unit and a plurality of remote units communicating with the at least another master unit to communicate both the output-signal of the first output port and the output signal of the second output port to a device for providing MIMO communications.
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Accused Products
Abstract
A distributed antenna system (DAS) includes a multiple-input and multiple-output (“MIMO”) base station configured to output at least a first and second signal, and a hybrid coupler coupled thereto, the coupler configured to receive the first and second signal from the MIMO base station on respective first and second ports and provide an output signal on at least one output port, the output signal including at least a portion of the first signal and at least a portion of the second signal. The DAS further includes a master unit communicating with the coupler and configured to receive at least the output signal, and at least one remote unit communicating with the master unit and configured to communicate the output signal to a device.
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Citations
22 Claims
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1. A system comprising:
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a multiple-input and multiple-output (MIMO) base station configured to output a first branch of a MIMO signal and a second branch of the MIMO signal, the branches of the MIMO signal being in the same frequency channel and one of the branches including signaling parameters; a hybrid coupler coupled to the MIMO base station, the coupler configured to receive the first branch of the MIMO signal and the second branch of the MIMO signal from the MIMO base station on respective first and second input ports and provide output signals on first and second output ports, the output signal on the first output port including at least a portion of the first branch of the MIMO signal and at least a portion of the second branch of the MIMO signal that is phase shifted orthogonally in relation to the respective second branch of the MIMO signal and the output signal on the second output port including at least a portion of the second branch of the MIMO signal and at least a portion of the first branch of the MIMO signal that is phase shifted orthogonally in relation to the respective first branch of the MIMO signal; at least one master unit communicating with the coupler and configured to receive the output signal from the first output port of the coupler for distributing the output signal to one or more remote units; at least another master unit communicating with the coupler and configured to receive the output signal from the second output port of the coupler for distributing the output signal to one or more remote units; a plurality of remote units communicating with the at least one master unit and a plurality of remote units communicating with the at least another master unit to communicate both the output-signal of the first output port and the output signal of the second output port to a device for providing MIMO communications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for transmitting signals through a distributed system comprising:
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providing at least a first branch of a MIMO signal and a second branch of the MIMO signal, the branches of the MIMO signal being in the same frequency channel and one of the branches including signaling parameters; delivering the first and second branches of the MIMO signal to respective first and second input ports of a hybrid coupler; providing output signals on first and second output ports of the coupler, the output signal on the first output port including at least a portion of the first branch of the MIMO signal and at least a portion of the second branch of the MIMO signal that is phase shifted orthogonally in relation to the respective second branch of the MIMO signal and the output signal on the second output port including at least a portion of the second branch of the MIMO signal and at least a portion of the first branch of the MIMO signal that is phase shifted orthogonally in relation to the respective first branch of the MIMO signal; directing the output signal from the first output port to at least one master unit communicating with the coupler for distributing the output signal to one or more remote units; directing the output signal from the second output port to at least another master unit communicating with the coupler for distributing the output signal to one or more remote units; forwarding the output signal from the at least one master unit to a plurality of remote units communicating with the at least one master unit and forwarding the output signal from the at least another master unit to a plurality of remote units and communicating both the output signal of the first output port and the output signal of the second output port to a device from the remote units for providing MIMO communications. - View Dependent Claims (14, 15, 17, 18, 20)
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16. A system comprising:
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a multiple-input and multiple-output (MIMO) base station configured to output a first branch of a MIMO signal and a second branch of the MIMO signal; a hybrid coupler coupled to the MIMO base station, the coupler configured to receive the first branch of the MIMO signal and the second branch of the MIMO signal from the MIMO base station on respective first and second input ports and provide a first output signal on an output port, the first output signal including a portion of the first branch of the MIMO signal and a portion of the second branch of the MIMO signal; a single-input and single-output (SISO) base station configured to output a SISO output signal as a second output signal; a summing circuit communicating with the output port of the coupler and the SISO base station, the summing circuit configured to combine the first and second output signals and provide a combined output signal; at least one master unit communicating with the summing circuit and configured to receive the combined output signal; and at least one remote unit communicating with the at least one master unit and configured to provide the combined output signal to a coverage area. - View Dependent Claims (19, 21, 22)
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Specification