System architecture for optimizing the capacity of adaptive array systems
A wireless communications system that uses adaptive arrays is disclosed in which the capacity is optimized. A method for optimizing the capacity of a wireless communications system that uses adaptive arrays is also disclosed. The wireless communication system may be a point to multi-point (P2MP) and/or a multi-point to multi-point (MP2MP) STAP system.
1. A distributed hierarchical beamforming system comprising:
a plurality of first processing units, wherein each first processing unit of the plurality of processing units comprises a transceiver, an internal calibration unit, and a plurality of independent digital baseband beamformers, and wherein each first processing unit is physically coupled to an antenna subarray of an antenna array, wherein each first processing unit is configured to generate an output signal;
a second processing unit, communicatively coupled to each first processing unit of the plurality of first processing units, the second processing unit comprising a digital combiner and a splitter, wherein the second processing unit is configured to aggregate the output signal from each first processing unit; and
a third processing unit, communicatively coupled to the second processing unit, the third processing unit configured to perform distributed beamforming based on performing a weights combination on the aggregate output signal of the second processing unit, the weights combination based at least on performing a direct matrix inversion normalized least square.
2. The distributed hierarchical beamforrning system of claim 1 , further comprising an external calibration source configured to calibrate the internal calibration unit of each first processing unit of the plurality of first processing units.
3. The distributed hierarchical beamforming system of claim 1 , wherein the first processing unit is configured to generate the output signal based at least on performing a first normalized least square.
4. The distributed hierarchical beamforming system of claim 1 , wherein the second processing unit is configured to aggregate the output signal from each first processing unit based at least on performing a second normalized least square with high order filters in a time domain, in a frequency domain, or combinations thereof.
5. The distributed hierarchical beamforming system of claim 1 , wherein the third processing unit is configured to perform the weights combination on the aggregate output signal from the second processing unit further based at least on determining an optimal spatial filter for each antenna of a plurality of antennas of the antenna subarray, wherein the optimal spatial filter comprises a beamforming weight.
6. The distributed hierarchical beamforming system of claim 1 , wherein each first processing unit of the plurality of processing units is further configured to remove initial interference.
7. The distributed hierarchical beamforming system of claim 1 , wherein the second processing unit is further configured to remove residual interference.
8. The distributed hierarchical beamforming system of claim 1 , wherein each first processing unit of the plurality of first processing units is a PURF-D processor and wherein the second processing unit is a PUD-D processor.
9. The distributed hierarchical beamforming system of claim 1 , wherein each first processing unit comprises a radio frequency bidirectional port, a digital data bidirectional port, a digital control bidirectional port, a reference clock bidirectional port, a calibration bidirectional port, or combinations thereof.
10. The distributed hierarchical beamforming system of claim 9 , wherein the radio frequency bidirectional port is configured to connect to at least one antenna of a plurality of antennas of the antenna subarray.
11. The distributed hierarchical beamforming system of claim 9 , wherein the digital control bidirectional port is configured to transmit and receive control signals from the third processing unit, wherein the control signals comprise beamforming weights that support distributed beamforming.
12. A method for distributed hierarchical beamforming, comprising:
generating, using a first processing unit of a plurality of processing units of a distributed hierarchical beamforming system, an output signal, wherein each first processing unit of the plurality of first processing units is physically coupled to an antenna subarray of an antenna array;
aggregating, using a second processing unit communicatively coupled to each first processing unit of the plurality of first processing units, the output signal from each first processing unit; and
performing, using a third processing unit communicatively coupled to the second processing unit, distributed beamforming based on performing a weights combination on the aggregate output signal of the second processing unit, the weights combination based at least on performing a direct matrix inversion normalized least square.
13. The method of claim 12 , wherein generating the output signal is based at least on performing a first normalized least square.
14. The method of claim 12 , wherein aggregating the output signal from each first processing unit is based at least on performing a second normalized least square with high order filters in a time domain, in a frequency domain, or combinations thereof.
15. The method of claim 12 , wherein performing the weights combination on the aggregate output signal from the second processing unit is further based at least on determining an optimal spatial filter for each antenna of a plurality of antennas of the antenna subarray, wherein the optimal spatial filter comprises a beamforming weight.
16. The method of claim 12 , further comprising connecting, using a radio frequency bidirectional port of the first processing unit of the plurality of processing units of the distributed hierarchical beamforming system, to at least one antenna of a plurality of antennas of the antenna subarray.
17. The method of claim 12 , further comprising transmitting and receiving, using a digital control bidirectional port of the first processing unit of the plurality of processing units of the distributed hierarchical beamforming system, control signals from the third processing unit, wherein the control signals comprise beamforming weights that support distributed beamforming.
18. The method of claim 12 , further comprising removing, using the first processing unit, initial interference.