Apparatus, system and method of simultaneous transmit and receive (STR) wireless communication

1. A simultaneous transmit and receive (STR) transceiver comprising:

a receiver;

a transmitter;

a Radio Frequency (RF) echo cancellation module to generate an analog echo cancellation signal to be applied to a received RF signal via said receiver based on a transmitted RF signal via said transmitter, said RF echo cancellation module comprising a plurality of tap modulators to modulate a plurality of delayed taps of said transmitted RF signal, a tap modulator of said tap modulators including a plurality of phase shifters to generate a plurality of phase-shifted signals by applying a plurality of phase shifts to a delayed tap of said plurality of delayed taps, the tap modulator further including a plurality of multipliers to multiply said plurality of phase-shifted signals with a respective plurality of weights; and

a digital baseband module to determine said plurality of weights based on a plurality of subcarriers of a digital frequency-domain signal corresponding to said transmitted RF signal.

2. The transceiver of claim 1 , wherein said digital baseband module includes:

a compensator to generate a plurality of compensated sub-carrier signals corresponding to a phase shifter of said plurality of phase shifters based on a phase shift of said phase shifter and a tap delay of said delayed tap;

a frequency-domain to time-domain transformer to transform said plurality of compensated sub-carrier signals into a plurality of compensated time-domain signals; and

a weight calculator to determine a weight corresponding to said phase shifter based on the compensated time-domain signals.

3. The transceiver of claim 2 , wherein said weight calculator is to determine said weight based on said received RF signal.

4. The transceiver of claim 2 comprising a receive path including:

a converter to convert said transmitted RF signal into a digital time-domain signal; and

a time-domain to frequency-domain transformer to transform said digital time-domain signal into said digital frequency-domain signal.

5. The transceiver of claim 4 , wherein said compensator is to generate the plurality of compensated sub-carrier signals based on a frequency response of said receive path.

6. The transceiver of claim 4 , wherein said weight calculator is to determine said weight based on a phase difference between said receive path and a receiver path of said receiver.

7. The transceiver of claim 2 , wherein said compensator is to generate the plurality of compensated sub-carrier signals based on a frequency response of a receiver path of said receiver, and a frequency response of a path of the tap modulator and phase shifter.

8. The transceiver of claim 1 , wherein said tap modulator comprises a phase-shifting summer to sum the plurality of phase-shifted signals into a tap modulator output of said tap modulator, and wherein said RF echo cancellation module comprises a tap summer to generate said analog echo cancellation signal by summing tap modulator outputs of said plurality of tap modulators.

9. The transceiver of claim 1 , wherein said plurality of phase shifts comprise fixed phase shifts.

10. The transceiver of claim 1 , wherein said plurality of delayed taps are delayed by a plurality of fixed delays.

11. A wireless communication device comprising:

at least one antenna;

a receiver coupled to said antenna;

a transmitter coupled to said antenna;

a Radio Frequency (RF) echo cancellation module to generate an analog echo cancellation signal to be applied to a received RF signal via said receiver based on a transmitted RF signal via said transmitter, said RF echo cancellation module comprising a plurality of tap modulators to modulate a plurality of delayed taps of said transmitted RF signal, a tap modulator of said tap modulators including a plurality of phase shifters to generate a plurality of phase-shifted signals by applying a plurality of phase shifts to a delayed tap of said plurality of delayed taps, the tap modulator further including a plurality of multipliers to multiply said plurality of phase-shifted signals with a respective plurality of weights;

a digital baseband module to determine said plurality of weights based on a plurality of subcarriers of a digital frequency-domain signal corresponding to said transmitted RF signal;

a processor; and

a memory.

12. The wireless communication device of claim 11 , wherein said digital baseband module includes:

a compensator to generate a plurality of compensated sub-carrier signals corresponding to a phase shifter of said plurality of phase shifters based on a phase shift of said phase shifter and a tap delay of said delayed tap;

a frequency-domain to time-domain transformer to transform said plurality of compensated sub-carrier signals into a plurality of compensated time-domain signals; and

a weight calculator to determine a weight corresponding to said phase shifter based on the compensated time-domain signals.

13. The wireless communication device of claim 12 , wherein said weight calculator is to determine said weight based on said received RF signal.

14. The wireless communication device of claim 12 comprising a receive path including:

a converter to convert said transmitted RF signal into a digital time-domain signal; and

a time-domain to frequency-domain transformer to transform said digital time-domain signal into said digital frequency-domain signal.

15. The wireless communication device of claim 14 , wherein said compensator is to generate the plurality of compensated sub-carrier signals based on a frequency response of said receive path.

16. The wireless communication device of claim 14 , wherein said weight calculator is to determine said weight based on a phase difference between said receive path and a receiver path of said receiver.

17. The wireless communication device of claim 12 , wherein said compensator is to generate the plurality of compensated sub-carrier signals based on a frequency response of a receiver path of said receiver, and a frequency response of a path of the tap modulator and phase shifter.

18. A method of wireless communication, the method comprising:

determining a plurality of weights in a digital baseband based on a plurality of subcarriers of a digital frequency-domain signal corresponding to a transmitted Radio Frequency (RF) signal;

generating an analog echo cancellation signal based on said transmitted RF signal, wherein generating said analog echo cancellation signal comprises:

modulating a plurality of delayed taps of said transmitted RF signal, wherein modulating a delayed tap of said plurality of delayed taps comprises generating a plurality of phase-shifted signals by applying a plurality of phase shifts to said delayed tap, and multiplying said plurality of phase-shifted signals with said plurality of weights; and

applying the analog echo cancellation signal to a received RF signal.

19. The method of claim 18 , wherein determining a plurality of weights comprises:

generating a plurality of compensated sub-carrier signals corresponding to a phase shift of said plurality of phase shifts based on the phase shift and a tap delay of said delayed tap;

transforming said plurality of compensated sub-carrier signals into a plurality of compensated time-domain signals; and

determining a weight corresponding to said phase shift based on the compensated time-domain signals.

20. The method of claim 19 comprising:

converting, at a receive path, said transmitted RF signal into a digital time-domain signal; and

transforming, at said receive path, said digital time-domain signal into said digital frequency-domain signal.

21. The method of claim 20 comprising generating the plurality of compensated sub-carrier signals based on a frequency response of said receive path.

22. A product including a non-transitory storage medium having stored thereon instructions that, when executed by a machine, result in:

determining a plurality of weights in a digital baseband based on a plurality of subcarriers of a digital frequency-domain signal corresponding to a transmitted Radio Frequency (RF) signal;

generating an analog echo cancellation signal based on said transmitted RF signal, wherein generating said analog echo cancellation signal comprises:

modulating a plurality of delayed taps of said transmitted RF signal, wherein modulating a delayed tap of said plurality of delayed taps comprises generating a plurality of phase-shifted signals by applying a plurality of phase shifts to said delayed tap, and multiplying said plurality of phase-shifted signals with said plurality of weights; and

applying the analog echo cancellation signal to a received RF signal.

23. The product of claim 22 , wherein determining a plurality of weights comprises:

generating a plurality of compensated sub-carrier signals corresponding to a phase shift of said plurality of phase shifts based on the phase shift and a tap delay of said delayed tap;

transforming said plurality of compensated sub-carrier signals into a plurality of compensated time-domain signals; and

determining a weight corresponding to said phase shift based on the compensated time-domain signals.

24. The product of claim 23 , wherein said instructions result in:

converting, at a receive path, said transmitted RF signal into a digital time-domain signal; and

transforming, at said receive path, said digital time-domain signal into said digital frequency-domain signal.