Carrier aggregation radio system

1. A carrier aggregation radio system comprising:

a transceiver comprising;

main receiver intermediate frequency (IF) de-modulation and processing circuitry coupled to a first RF mixer that receives a first local oscillator signal to mix with RF signals captured by a main antenna;

diversity receiver IF de-modulation and processing circuitry coupled to a second RF mixer that receives a second local oscillator signal to mix with diversity signals captured by a diversity antenna;

carrier aggregation receiver IF de-modulation and processing circuitry coupled to a third RF mixer that receives a third local oscillator signal to mix with carrier aggregation signals captured by the diversity antenna; and

a control system configured to:

command a radio front end to route diversity signals from the diversity antenna to the main receiver IF de-modulation and processing circuitry and the diversity receiver IF de-modulation and processing circuitry in a first mode;

command the radio front end to route carrier aggregation signals from the diversity antenna to the carrier aggregation receiver IF de-modulation and processing circuitry in a second mode; and

command the radio front end via a third mode in which diversity signals are routed from the diversity antenna to the main receiver IF de-modulation and processing circuitry and the diversity receiver IF de-modulation and processing circuitry while carrier aggregation signals are routed from the diversity antenna to the carrier aggregation receiver IF de-modulation and processing circuitry.

2. The carrier aggregation radio system of claim 1 wherein the second mode provides low band to high band carrier aggregation.

3. The carrier aggregation radio system of claim 1 wherein the second mode provides high band to high band carrier aggregation.

4. The carrier aggregation radio system of claim 1 wherein the second mode provides low band to low band carrier aggregation.

5. The carrier aggregation radio system of claim 1 wherein the radio front end comprises:

main receiver front end circuitry that includes duplexers and main antenna switches that are communicatively coupled between a main antenna and the duplexers; and

diversity receiver front end circuitry that includes receive only filters and diversity antenna switches that are communicatively coupled between the diversity antenna and the receive only filters.

6. The carrier aggregation radio system of claim 5 further including a diplexer coupled between the diversity antenna and the diversity antenna switches to separate high band signals from low band signals captured by the diversity antenna.

7. The carrier aggregation radio system of claim 6 further including at least one network element coupled between the diversity antenna switches and the receive only filters to improve reflective power matching and receive diplexing.

8. The carrier aggregation radio system of claim 7 wherein the at least one network element is a phase shifter.

9. The carrier aggregation radio system of claim 6 further including at least one termination network coupled between an extra switch throw of the diversity antenna switches and a termination node.

10. The carrier aggregation radio system of claim 9 wherein the at least one termination network provides around 50 Ohms of impedance when a given one of either a low band port or a high band diplexer port is not in use.

11. The carrier aggregation radio system of claim 6 further including an antenna tuner network coupled between the main antenna and the main antenna switches.

12. The carrier aggregation radio system of claim 6 further including an antenna tuner network coupled between the diversity antenna and the diversity antenna switches.

13. The carrier aggregation radio system of claim 6 wherein the diversity receiver front end circuitry is integrated into a switch duplexer module (SDM).

14. The carrier aggregation radio system of claim 6 wherein the duplexers are integrated into a duplexers module.

15. A method of wireless communication including carrier aggregation comprising:

capturing diversity signals and carrier aggregation signals via a main antenna and a diversity antenna;

routing the diversity signals to a first mixer coupled to main receiver IF de-modulation and processing circuitry and to a second mixer coupled to diversity receiver IF de-modulation and processing circuitry in a first mode;

mixing the diversity signals with a first local oscillator signal to output a first IF signal to the main receiver IF de-modulation and processing circuitry via the first mixer;

mixing the diversity signals with a second local oscillator signal to output a second IF signal to the diversity receiver IF de-modulation and processing circuitry via the second mixer;

routing the carrier aggregation signals to a third mixer coupled to carrier aggregation receiver IF de-modulation and processing circuitry in a second mode;

mixing the carrier aggregation signals with a third local oscillator signal to output a third IF signal to the carrier aggregation receiver IF de-modulation and processing circuitry via the third mixer, and

routing diversity signals from the diversity antenna to the main receiver IF de-modulation and processing circuitry and the diversity receiver IF de-modulation and processing circuitry while routing carrier aggregation signals from the diversity antenna to the carrier aggregation receiver IF de-modulation and processing circuitry in a third mode.

16. The method of wireless communication of claim 15 wherein the second mode provides low band to high band carrier aggregation.

17. The method of wireless communication of claim 15 wherein the second mode provides high band to high band carrier aggregation.

18. The method of wireless communication of claim 15 wherein the second mode provides low band to low band carrier aggregation.