Minimum feedback radio architecture with digitally configurable adaptive linearization

1. A radio transmission system comprising:

a plurality of power amplifiers (PAs);

a plurality of Volterra Engine (VE) linearizers corresponding to the PAs;

a plurality of feedback loops corresponding to the PAs;

at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and

an analog hybrid matrix (AHM) coupled to the PAs,

wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops.

2. The radio transmission system of claim 1 , further comprising:

an additional DHM,

wherein the additional DHM couples the feedback loops to the VE linearizers, and

wherein the VE linearizers are coupled between the DHM and the PAs.

3. The radio transmission system of claim 2 , wherein the VE linearizers receive a plurality of combined feedback signals from the additional DHM and use the combined feedback signals to adjust a plurality of corresponding combined input signals.

4. The radio transmission system of claim 1 , wherein the number of feedback loops is about equal to the number of AHM outputs.

5. The radio transmission system of claim 1 , wherein reducing the number of feedback loops decreases nonlinear signal combining and cross talk, increases signal processing capacity, reduces system cost, or combinations thereof.

6. The radio transmission system of claim 1 , wherein the radio transmission system is an agile radio head.

7. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes.

8. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes to support power combining.

9. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes to support beam forming.

10. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes to support sector power pooling.

11. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes to support power combining and beam forming.

12. The radio transmission system of claim 6 , wherein the radio transmission system is configurable without hardware changes to support beam forming and sector power pooling.

13. A radio system comprising:

a plurality of power amplifiers (PAs);

a Volterra digital hybrid matrix (VDHM) coupled to the PAs;

a plurality of feedback loops corresponding to the PAs; and

an analog hybrid matrix (AHM) coupled to the PAs,

wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.

14. The radio system of claim 13 , wherein the VDHM comprises:

a plurality of sets of Volterra Engine (VE) linearizers corresponding to the PAs; and

a plurality of couplers coupled to the sets of VE linearizers and the PAs, wherein each set of VE linearizers comprises a plurality of VE linearizers, wherein each coupler connects one VE linearizer from each set of VE linearizers to one corresponding P A, and wherein the feedback loops are connected to the VDHM.

15. The radio system of claim 14 , wherein each VE linearizer in a set of VE linearizers receives a component signal, substantially similar to an input signal associated with the set of VE linearizers, and wherein the component signals from one VE linearizer in each set of VE linearizers is combined at the corresponding coupler to obtain a combined signal for each PA.

16. The radio system of claim 14 , wherein each set of VE linearizers is coupled to one corresponding feedback loop.

17. A method for performing radio transmission, comprising:

receiving one or more input signals at a first digital hybrid matrix (DHM);

providing a first plurality of signals from the DHM to a corresponding plurality of Volterra Engine (VE) linearizers;

providing a second plurality of signals from the plurality of VE linearizers to a corresponding plurality of power amplifiers (PAs);

providing a third plurality of signals from the plurality of PAs to an analog hybrid matrix (AHM) coupled to the plurality of PAs;

providing feedback from the AHM to the plurality of VE linearizers, but not to the PAs thereby reducing the number of feedback loops.

18. The method of claim 17 , wherein said providing feedback from the AHM to the plurality of VE linearizers comprises:

providing the feedback to a second DHM; and

the DHM providing signals corresponding to the feedback to the plurality of VE linearizers.

19. The method of claim 18 , wherein the VE linearizers receive a plurality of combined feedback signals from the additional DHM and use the combined feedback signals to adjust a plurality of corresponding combined input signals.

20. The method of claim 17 , wherein the number of feedback loops is about equal to the number of AHM outputs.