Digital modulation and shift keying

1. A method of transmitting digital information having a series of datums represented in a plurality of symbols from a modulator to a demodulator, said method comprising:

a) selecting a first number of half-periods of a first phase distinguished carrier signal for representing a corresponding symbol of a first datum of said series of datums;

b) selecting a second number of half-periods of a second phase distinguished carrier signal for representing a corresponding symbol of a datum following said first datum;

c) determining at least one matching carrier signal having a third number of half-periods of a format to conform to a transition of said first phase distinguished carrier signal to said second phase distinguished carrier signal;

d) sequentially arranging into a modulated carrier said first number of half-periods of a first phase distinguished carrier signal, said third number of half-periods of said at least one matching carrier signal and said second number of half-periods of said second phase distinguished carrier signal; and

e) transmitting said modulated carrier from said modulator to said demodulator.

2. The method as defined in claim 1 , wherein said first number of half-periods is equal to said second number of half-periods.

3. The method as defined in claim 2 , wherein a ratio of said first number of half-periods to said third number of half-periods is compatible with a partial-cross-correlator demodulator module in said demodulator that produces a plurality of partial-cross-correlation values for each said phase distinguished carrier signals, and said plurality of partial-cross-correlation values being solely dependent on said phase distinguished carrier signals.

4. The method as defined in claim 3 , wherein the ratio of said first number of half-periods to said third number of half-periods is 3.

5. The method as defined in claim 1 , wherein said first number of half-periods is equal to said third number of half-periods.

6. The method as defined in claim 2 , wherein said third number of half-periods is 1.

7. The method as defined in claim 1 , wherein said at least one matching carrier signal is selected from a set including two carrier signals having antipodal phases.

8. The method as defined in claim 1 , wherein said at least one matching carrier signal is selected from a set including linear combinations of sinusoidally modulated quadrature carrier signals.

9. The method as defined in claim 1 , wherein at least one matching carrier signal is determined in response to additional digital information.

10. The method of transmitting digital information as claimed in claim 1 , wherein said modulated carrier is generated by yaw shift keying (YSK) modulation.

11. A method of extracting digital information having a series of datums represented in a plurality of symbols contained in a modulated carrier containing therein a first number of half-periods of a first phase distinguished carrier signal representing a corresponding symbol of a first datum of said series of datums, a second number of half-periods of a second phase distinguished carrier signal for representing a corresponding symbol of a datum following said first datum and a third number determined from at least one matching carrier signal having of half-periods of a format to conform to a transition of said first phase distinguished carrier signal to said second phase distinguished carrier signal, said method comprising:

a) sampling said modulated carrier into sampled results;

b) detecting matching signals from the sampled results;

c) synchronizing a clock with said matching signals;

d) detecting long carrier signals associated with same modulated carrier from the sampled results in a correct interval as determined by said clock; and

e) demodulating said long carrier signals from the modulated carrier.

12. The method of extracting digital information as claimed in claim 11 , further comprising:

a.1) partially cross-correlating said sampling results; and

a.2) synchronizing said sampled results utilizing a history of said cross-correlation results.

13. The method of extracting digital information as claimed in claim 12 , wherein said modulated carrier is generated by yaw shift keying (YSK) modulation.

14. A method of transmitting digital information having a series of datums represented in a plurality of symbols between a pair of corresponding modulator and demodulator, said method comprising:

a) at said modulator:

i) selecting a first number of half-periods of a first phase distinguished carrier signal for representing a corresponding symbol of a first datum of said series of datums;

ii) selecting a second number of half-periods of a second phase distinguished carrier signal for representing a corresponding symbol of a datum following said first datum;

iii) determining at least one matching carrier signal having a third number of half-periods of a format to conform to a transition of said first phase distinguished carrier signal to said second phase distinguished carrier signal; and

iv) sequentially arranging into a modulated carrier said first number of half-periods of a first phase distinguished carrier signal, said third number of half-periods of said at least one matching carrier signal and said second number of half-periods of said second phase distinguished carrier signal;

b) transmitting said modulated carrier from said modulator to said demodulator; and

c) at said demodulator:

i) sampling said modulated carrier;

ii) detecting matching signals from the modulated carrier;

iii) synchronizing a clock with said matching signals;

iv) detecting long carrier signals from the modulated carrier in the correct interval as determined by said clock; and

v) demodulating said long carrier signals from the modulated carrier.

15. The method of transmitting digital information as claimed in claim 14 , wherein said modulated carrier is generated by yaw shift keying (YSK) modulation.

16. A method of transmitting digital information having a series of datums represented in a plurality of symbols between a modulator and demodulator, said method comprising:

a) at said modulator:

i) selecting a first number of half-periods of a first phase distinguished carrier signal for representing a corresponding symbol of a first datum of said series of datums;

ii) selecting said first number of half-periods of a second phase distinguished carrier signal for representing a corresponding symbol of a datum following said first datum;

iii) determining at least one matching carrier signal having a second number of half-periods of a format to conform to a transition of said first phase distinguished carrier signal to said second phase distinguished carrier signal, wherein the ratio of said first number of half-periods to said second number of half-periods is compatible with a partial-cross-correlator demodulator that produces a plurality of partial-cross-correlation values for each said phase distinguished carrier signals, and said plurality of partial-cross-correlation values being solely dependent on said phase distinguished carrier signals; and

iv) sequentially arranging into a modulated carrier said first number of half-periods of a first phase distinguished carrier signal, said third number of half-periods of said matching carrier signal and said second number of half-periods of said second phase distinguished carrier signal;

b) transmitting said modulated carrier from said modulator to said demodulator; and

c) at said demodulator:

i) sampling the modulated carrier;

ii) partially cross-correlating said sampling results; and

iii) synchronizing said sampling on the basis of a history of said cross-correlation results.

17. The method of transmitting digital information as claimed in claim 16 , wherein said modulated carrier is generated by yaw shift keying (YSK) modulation.