Wireless communications device for signal with selected data symbol mapping and related methods
View Patent ↗A wireless communications device may include a wireless receiver for receiving a Gaussian phase shift keyed signal having a selected data symbol mapping, and a demodulator coupled to the wireless receiver for demodulating the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping.
1. A wireless communications device comprising:
a wireless receiver configured to receive a Gaussian phase shift keyed signal having a selected data symbol mapping; and
a demodulator coupled to said wireless receiver, and configured to demodulate the Gaussian phase shift keyed signal at odd indexes using memory-less data symbol decisions based upon the selected data symbol mapping by determining a first difference between absolute values of corresponding real and imaginary values of a current received symbol estimate of the Gaussian phase shift keyed signal.
2. The wireless communications device according to claim 1 wherein said demodulator is configured to demodulate the Gaussian phase shift keyed signal at even indexes by at least:
adjusting the current received symbol estimate by 45 degrees; and
determining a second difference between absolute values of corresponding real and imaginary values of the adjusted current received symbol estimate of the Gaussian phase shift keyed signal.
3. The wireless communications device according to claim 2 wherein said demodulator is configured to decode a selectively mapped data symbol of the Gaussian phase shift keyed signal as a first logic state when a corresponding difference is less than zero and as a second logic state when a corresponding difference is greater than zero.
4. The wireless communications device according to claim 1 wherein said demodulator is configured to perform a phase state mapping constraint check on the demodulated Gaussian phase shift keyed signal.
5. The wireless communications device according to claim 1 wherein said demodulator comprises a block equalizer demodulator.
6. The wireless communications device according to claim 1 wherein the Gaussian phase shift keyed signal has 8 phase states, each phase state being spaced apart by 45 degrees.
7. The wireless communications device according to claim 1 wherein the Gaussian phase shift keyed signal has a Gaussian shaped pulse spread across three data symbols.
8. The wireless communications device according to claim 1 wherein the Gaussian phase shift keyed signal has an effective rotating 4-state Phase Shift Keying (PSK) modulation.
9. A wireless communications device comprising:
a wireless receiver configured to receive a Gaussian phase shift keyed signal having a selected data symbol mapping; and
a block equalizer demodulator coupled to said wireless receiver, and configured to demodulate the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping and to perform a phase state mapping constraint check on the demodulated Gaussian phase shift keyed signal.
10. The wireless communications device according to claim 9 wherein said block equalizer demodulator is configured to demodulate the Gaussian phase shift keyed signal at odd indexes by at least determining a first difference between absolute values of corresponding real and imaginary values of a current received symbol estimate of the Gaussian phase shift keyed signal.
11. The wireless communications device according to claim 10 wherein said block equalizer demodulator is configured to demodulate the Gaussian phase shift keyed signal at even indexes by at least:
adjusting the current received symbol estimate by 45 degrees; and
determining a second difference between absolute values of corresponding real and imaginary values of the adjusted current received symbol estimate of the Gaussian phase shift keyed signal.
12. The wireless communications device according to claim 11 wherein said block equalizer demodulator is configured to clamp demodulated symbol estimates based upon a rotating 4-state Phase Shift Keyed signal constellation.
13. The wireless communications device according to claim 9 wherein the Gaussian phase shift keyed signal has 8 phase states, each phase state being spaced apart by 45 degrees.
14. The wireless communications device according to claim 9 wherein the Gaussian phase shift keyed signal has a Gaussian shaped pulse spread across three data symbols.
15. A method for operating a wireless receiver receiving a Gaussian phase shift keyed signal having a selected data symbol mapping, the method comprising:
demodulating the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping, the demodulating comprising demodulating the Gaussian phase shift keyed signal at odd indexes by at least determining a first difference between absolute values of corresponding real and imaginary values of a current received symbol estimate of the Gaussian phase shift keyed signal.
16. The method according to claim 15 wherein demodulating comprises demodulating the Gaussian phase shift keyed signal at even indexes by at least:
adjusting the current received symbol estimate by 45 degrees; and
determining a second difference between absolute values of corresponding real and imaginary values of the adjusted current received symbol estimate of the Gaussian phase shift keyed signal.
17. The method according to claim 16 wherein demodulating comprises demodulating a selectively mapped data symbol of the Gaussian phase shift keyed signal as a first logic state when a corresponding difference is less than zero and as a second logic state when a corresponding difference is greater than zero.
18. The method according to claim 15 wherein demodulating comprises performing a phase state mapping constraint check on the demodulated Gaussian phase shift keyed signal.
19. A wireless communications device comprising:
a wireless receiver configured to receive a Gaussian phase shift keyed signal having a selected data symbol mapping; and
a demodulator coupled to said wireless receiver and configured to demodulate the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping, and to perform a phase state mapping constraint check on the demodulated Gaussian phase shift keyed signal.
20. The wireless communications device according to claim 19 wherein the Gaussian phase shift keyed signal has 8 phase states, each phase state being spaced apart by 45 degrees.
21. The wireless communications device according to claim 19 wherein the Gaussian phase shift keyed signal has 8 phase states, each phase state being spaced apart by 45 degrees.
22. The wireless communications device according to claim 19 wherein the Gaussian phase shift keyed signal has a Gaussian shaped pulse spread across three data symbols.
23. A method for operating a wireless receiver receiving a Gaussian phase shift keyed signal having a selected data symbol mapping, the method comprising:
demodulating the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping comprising performing a phase state mapping constraint check on the demodulated Gaussian phase shift keyed signal.
24. The method according to claim 23 wherein demodulating comprises using a block equalizer demodulator.
25. The method according to claim 23 wherein the Gaussian phase shift keyed signal has 8 phase states, each phase state being spaced apart by 45 degrees.
26. The method according to claim 23 wherein the Gaussian phase shift keyed signal has a Gaussian shaped pulse spread across three data symbols.