System and method for increasing spot beam satellite bandwidth

1. An apparatus for demodulation of multiple received signals, comprising:

a receiver configured to receive a composite signal, the composite signal having a first signal and a second signal, the first signal overlapping the second signal; and

at least one processor configured to:

exponentiate the composite signal n-times until a first power of n yields a first continuous wave corresponding to the first signal, and a second power of n yields a second continuous wave corresponding to the second signal, the first power of n corresponding to a modulation estimate for the first signal, and the second power of n corresponding to a modulation estimate for the second signal, n being an integer greater than zero;

derive at least one symbol rate corresponding to the first signal based on the first power of n and the second power of n;

resample the composite signal based on the modulation estimate at x-times the at least one symbol rate to determine at least one symbol trajectory, at least one modulation type, and offset information between the first signal and the second signal, x being an integer greater than zero;

regenerate the first signal and the second signal based on the at least one modulation type, the at least one symbol trajectory, and offset information; and

output the first signal and the second signal.

2. The apparatus of claim 1 , wherein the composite signal comprises a third signal and wherein the processor is further configured to demodulate the third signal with the first signal and the second signal.

3. The apparatus of claim 1 , wherein the first power of n and the second power of n have different values, the first power of n corresponding to a first modulation type and the second power of n corresponding to a second modulation type.

4. The apparatus of claim 1 , wherein the offset information comprises a phase offset and a frequency offset between the first signal and the second signal.

5. The apparatus of claim 2 , wherein the phase offset and the frequency offset between the first signal and the second signal each equal zero.

6. The apparatus of claim 2 , wherein the first signal and the second signal have a same bandwidth and the phase offset between the first signal and the second signal equals zero.

7. The apparatus of claim 2 , wherein the first signal and the second signal have a same amplitude and the frequency offset between the first signal and the second signal equals zero.

8. The apparatus of claim 1 further comprising a windowing unit to correct the bandwidth limited portion based on a center frequency and a bandwidth of a combination of the first signal and the second signal.

9. The apparatus of claim 1 , wherein x equals two.

10. The apparatus of claim 1 , wherein n is a multiple of two.

11. A method for demodulating multiple received signals, comprising:

receiving a composite signal, the composite signal having a first signal and a second signal the first signal overlapping the second signal;

exponentiating the composite signal n-times until a first power of n yields a first continuous wave corresponding to the first signal, and a second power of n yields a second continuous wave corresponding to the second signal, the first power of n corresponding to a modulation estimate for the first signal, and the second power of n corresponding to a modulation estimate for the second signal, n being an integer graeter than zero;

deriving a symbol rate of the composite signal corresponding to at least one of the first signal and the second signal;

resampling the composite signal based on the modulation estimate at x-times the symbol rate estimate to determine a symbol trajectory, a modulation type and offset information between the first signal and the second signal, x being an integer greater than zero;

regenerating the first signal and the second signal based on the modulation type, the symbol trajectory, the shaping factor, and the offest information; and

outputting the first signal and the second signal.

12. The method of claim 11 , further comprising receiving the composite signal comprising a third signal; and

demodulating the third signal with the first signal and the second signal.

13. The method of claim 11 , exponentiating the composite signal until the first power of n yields a continuous wave at a first value of n and the second power of n yield a continuous wave at a second value of n that is different from the first value of n, each of the first value of n and the second value of n corresponding to a different modulation type.

14. The method of claim 11 , wherein the offset information comprises at least one of a phase offset, a frequency offset, and a time delay between the first signal and the second signal.

15. The method of claim 11 further comprising correcting the composite signal based on a center frequency and a bandwidth of a combination of the first signal and the second signal.

16. The method of claim 11 , wherein x equals two.

17. The method of claim 11 , wherein n is a multiple of two.

18. A method for demodulating a composite signal, the composite signal having a first constituent signal overlapping a second constituent signal in frequency, the method comprising:

multiplying the composite signal by itself a first number of times until the first number of times produces at least one continuous waveform, the first number of times indicating at least one modulation estimate;

determining at least one symbol rate of the composite signal, the at least one symbol rate based on the first number of times and the continuous waveform;

resampling the composite signal based on the at least one modulation estimate at a multiple of the at least one symbol rate to determine a symbol trajectory, a modulation type, and offset information between the first constituent signal and the second constituent signal;

regenerating the first constituent signal and the second constituent signal based on the modulation type, the symbol trajectory, the shaping factor, and the offest information; and

outputting the first constituent signal and the second constituent signal.

19. The method of claim 18 further comprising:

multiplying the composite signal by itself the first number of times to produce a continuous waveform corresponding to the first constituent signal, the first number of time indicating a first modulation type of the first constituent signal; and

multiplying the composite signal by itself a second number of times to produce a continuous waveform corresponding to the second constituent signal, the second number of times indicating a second modulation of the second constituent signal, the second number of times being different from the first number of times.

20. The method of claim 18 further comprising:

determining a first symbol rate estimate based on the continuous wave and the first number of times;

determining a first symbol rate corresponding to the first constituent signal, the first symbol rate based on a first adaptive equalizer sampling the composite signal at a first sampling rate equal to a multiple of the first symbol rate estimate;

determining a second symbol rate estimate based on the continuous wave and the second number of times; and

determining a second symbol rate corresponding to the second constituent signal, the second symbol rate based on a second adaptive equalizer sampling the composite signal at a sampling rate equal to a multiple of a second symbol rate estimate.