Wireless communications device having temporary correlation matrix with time inversion and related methods
View Patent ↗A wireless communications device may include a receiver configured to receive a continuous phase modulation (CPM) signal and a demodulator coupled downstream from the receiver. The demodulator may be configured to generate a CPM correlation matrix based upon an expected CPM signal, and generate a temporary correlation matrix. The temporary correlation matrix may include a first copy of the CPM correlation matrix inverted in time, and a second copy of the CPM correlation matrix.
1. A wireless communications device comprising:
a receiver configured to receive a continuous phase modulation (CPM) signal; and
a demodulator coupled downstream from said receiver and configured to
generate a complex-valued CPM correlation matrix based upon an expected CPM signal, and
generate a temporary correlation matrix comprising a first copy of the complex-valued CPM correlation matrix inverted in time, and a second copy of the complex-valued CPM correlation matrix.
2. The wireless communications device of claim 1 , wherein said demodulator is configured to generate the temporary correlation matrix comprising a third copy of the complex-valued CPM correlation matrix inverted in time.
3. The wireless communications device of claim 2 , wherein said demodulator is configured to generate the temporary correlation matrix having a size three times larger than a size of the complex-valued CPM correlation matrix.
4. The wireless communications device of claim 1 , wherein said demodulator is configured to apply a filter to the temporary correlation matrix.
5. The wireless communications device of claim 4 , wherein said filter comprises a Chebyshev filter.
6. The wireless communications device of claim 4 , wherein said filter comprises a multipath filter.
7. The wireless communications device of claim 4 , wherein said filter comprises a satellite communications channel filter.
8. The wireless communications device of claim 7 , wherein said satellite communication channel filter comprises an ultra high frequency follow-on (UFO) satellite communications filter.
9. The wireless communications device of claim 8 , wherein said UFO filter comprises a 5 kHz UFO channel filter.
10. The wireless communications device of claim 1 , wherein said demodulator is configured to demodulate the received CPM signal using a multiple of 4-ary modulation.
11. The wireless communications device of claim 1 , wherein said demodulator is configured to generate the complex-valued CPM correlation matrix as a 3 symbol correlation matrix.
12. A wireless communications device comprising:
a receiver configured to receive a continuous phase modulation (CPM) signal; and
a demodulator coupled downstream from said receiver and configured to
generate a complex-valued CPM correlation matrix based upon an expected CPM signal,
generate a temporary correlation matrix comprising a first copy of the complex-valued CPM correlation matrix inverted in time, a second copy of the complex-valued CPM correlation matrix, and a third copy of the complex-valued CPM correlation matrix inverted in time, and
apply a satellite communications channel filter to the temporary correlation matrix.
13. The wireless communications device of claim 12 , wherein said demodulator is configured to generate the temporary correlation matrix having a size three times larger than a size of the complex-valued CPM correlation matrix.
14. The wireless communications device of claim 12 , wherein said satellite communications filter comprises an ultra high frequency follow-on (UFO) satellite communications filter.
15. The wireless communications device of claim 14 , wherein said UFO filter comprises a 5 kHz UFO channel filter.
16. The wireless communications device of claim 12 , wherein said demodulator is configured to demodulate the received CPM signal using a multiple of 4-ary modulation.
17. A method of demodulating a continuous phase modulation (CPM) signal with a wireless communications device comprising a demodulator coupled downstream from a receiver, the method comprising:
generating a complex-valued CPM correlation matrix based upon an expected CPM signal using the demodulator;
generating a temporary correlation matrix, using the demodulator, comprising a first copy of the complex-valued CPM correlation matrix inverted in time, and a second copy of the complex-valued CPM correlation matrix.
18. The method of claim 17 , further comprising generating the temporary correlation matrix comprising a third copy of the complex-valued CPM correlation matrix inverted in time using the demodulator.
19. The method of claim 18 , comprising generating the temporary correlation matrix to have a size three times larger than a size of the complex-valued CPM correlation matrix.
20. The method of claim 17 , further comprising applying a filter to the temporary correlation matrix using the demodulator.
21. The method of claim 20 , wherein applying the filter to the temporary correlation matrix comprises applying a Chebyshev filter to the temporary correlation matrix.
22. The method of claim 20 , wherein applying a filter to the temporary correlation matrix comprises applying a multipath filter to the temporary correlation matrix.
23. The method of claim 20 , wherein applying a filter to the temporary correlation matrix comprises applying a satellite communications channel filter to the temporary correlation matrix.
24. The method of claim 23 , wherein applying the satellite communications channel filter to the temporary correlation matrix comprises applying an ultra high frequency follow-on (UFO) satellite communications filter to the temporary correlation matrix.
25. The method of claim 24 , applying the ultra high frequency follow-on (UFO) satellite communications filter to the temporary correlation matrix comprises applying a 5 kHz UFO channel filter to the temporary correlation matrix.