Devices and methods for diversity signal enhancement and cosite cancellation
Devices and methods for providing enhanced diversity reception and cosite cancellation are disclosed. According to one aspect, the subject matter described herein includes a device for providing enhanced diversity reception and cosite cancellation. The device includes a transmit chain connected to a circulator further connected to first antenna and to a combiner. The combiner is connected to anti-cosite circuitry and to first detector. The anti-cosite circuitry is further connected to a secondary antenna. The first detector is further connected to a receive chain.
1. A device for providing enhanced diversity reception and/or cosite cancellation, the device comprising:
a first antenna for transmitting and receiving signals, including receiving a first signal having cosite content caused by the transmitting of the signals using the first antenna;
a second antenna for receiving a diversity signal including cosite content caused by the transmitting of the signals using the first antenna;
a controller for deterministically calculating a desired phase shift of the diversity signal to reduce the cosite content of the first signal;
adjusting circuitry coupled to the controller for applying the deterministically calculated phase shift to the diversity signal; and
a combiner for combining the diversity signal with the deterministically calculated phase shift with the first signal and reducing the cosite content of the first signal.
2. The device of claim 1 wherein the adjusting circuitry includes a phase shifter.
3. The device of claim 2 wherein the phase shifter includes at least one selectable fixed phase delay element.
4. The device of claim 3 comprising a selector for selecting one of the at least one selectable fixed phase delay element.
5. The device of claim 1 wherein the adjusting circuitry comprises an amplifier.
6. The device of claim 1 comprising an attenuator.
7. The device of claim 1 wherein the adjusting circuitry comprises a phase shifter connected to a signal amplifier.
8. The device of claim 1 wherein the controller is connected to at least one of: a first detector; a phase shifter; an amplifier; and an attenuator.
9. The device of claim 8 comprising at least one of: a second detector between the first antenna and a first input of the combiner; and a third detector between the adjusting circuitry and a second input of the combiner.
10. The device of claim 8 wherein the adjusting circuitry is controllable.
11. The device of claim 1 , wherein the device comprises a mobile communication device.
12. The device of claim 11 , wherein the mobile communication device comprises a cellular telephone.
13. A method for providing enhanced diversity reception and/or cosite cancellation, the method comprising:
transmitting and receiving signals using a first antenna;
receiving a first signal from the first antenna, wherein the first signal includes cosite content caused by the transmitting of the signals using the first antenna;
receiving a diversity signal with a second antenna, wherein the diversity signal includes cosite content caused by the transmitting of the signals using the first antenna;
adjusting the diversity signal to provide an adjusted diversity signal, wherein adjusting the diversity signal includes providing a controller that deterministically calculates a desired phase shift of the diversity signal to reduce the cosite content of the first signal and adjustment circuitry coupled to the controller for applying the deterministically calculated phase shift to the diversity signal; and
combining the adjusted diversity signal and the first signal to provide enhanced receiving of the first signal, wherein combining the adjusted diversity signal and the first signal includes combining the diversity signal with the deterministically calculated phase shift with the first signal and reducing the cosite content of the first signal.
14. The method of claim 13 wherein adjusting the diversity signal comprises changing amplitude of the diversity signal.
15. The method of claim 14 wherein changing amplitude of the diversity signal includes equalizing an amplitude of cosite content of the diversity signal to be amplitude equalized with respect to an amplitude of cosite content of the first signal.
16. The method of claim 13 wherein applying the deterministically calculated phase shift to the diversity signal includes aligning the cosite content of the adjusted diversity signal anti-phase with respect to the cosite content of the first signal when the adjusted diversity signal and the first signal are combined.
17. The method of claim 13 comprising attenuating the diversity signal prior to applying the deterministically calculated phase shift to the diversity signal.
18. The method of claim 13 wherein the phase shift is of at least one type of: active, passive, variable, controlled and fixed.
19. The method of claim 13 wherein combining the adjusted diversity signal and the first signal includes providing the first signal to the combiner via a circulator.
20. The method of claim 13 wherein combining the adjusted diversity signal and the first signal includes at least one of: destructive combining of cosite contents of the adjusted diversity signal and the first signal; and constructive combining of the adjusted diversity signal and the first signal.
21. The method of claim 20 wherein the combining is conducted for plurality of frequencies.
22. The method of claim 13 comprising compensating a phase delay of the first signal.