Direct digital synthesis of signals using maximum likelihood bit-stream encoding

1. A method for direct digital synthesis of a digital RF input signal, comprising:

performing maximum likelihood sequence estimation on said digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error; and

applying said digital stream to a switching type power amplifier followed by an analog restitution filter,

wherein said maximum likelihood sequence estimation comprises an M algorithm and

wherein said prototype filter comprises an infinite impulse response (IIR) filter.

2. The method of claim 1 , wherein said digital stream is one of: NRZ, BPSK, QPSK, or QAM modulation formats.

3. The method of claim 1 , wherein said substantially minimum error comprises a difference between a digital output of said prototype filter and said digital RF input signal.

4. The method of claim 1 , further comprising:

applying said digital stream to an analog restitution filter.

5. The method of claim 1 , wherein an output of said analog restitution filter comprises an analog RF signal that approximates said digital RF input signal.

6. The method of claim 1 , wherein said analog restitution filter comprises one or more of a passive filter, a resistive-inductive-capacitive (R-L-C) circuit and a transmission line.

7. The method of claim 1 , wherein said digital stream is substantially equal to said input digital RF signal.

8. The method of claim 1 , wherein said prototype filter comprises a passband filter and said digital RF input signal is a baseband signal modulated to an RF frequency in digital domain.

9. The method of claim 1 , wherein said prototype filter comprises a baseband filter and said digital RF input signal is a baseband signal.

10. The method of claim 1 , wherein said maximum likelihood sequence estimation incorporates and compensates for a non-linear memory of an RF power amplifier or digital driver analog circuit.

11. The method of claim 1 , further comprising:

converting said digital stream to an analog signal using a transmitter of a serializer-deserializer device.

12. The method of claim 11 , wherein said method and said serializer-deserializer device are embodied on a System on a Chip.

13. The method of claim 4 , wherein said prototype filter has a frequency response that is similar to said analog restitution filter.

14. A digital RF input signal synthesizer, comprising:

a maximum likelihood sequence estimator for processing said digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error;

an analog restitution filter; and

a switching type power amplifier to receive the digital stream, wherein the switching type power amplifier is followed by an analog restitution filter.

15. The digital RF input signal synthesizer of claim 14 , wherein said substantially minimum error comprises a difference between a digital output of said prototype filter and said digital RF input signal.

16. The digital RF input signal synthesizer of claim 14 , wherein an output of said analog restitution filter comprises an analog RF signal that approximates said digital RF input signal.

17. The digital RF input signal synthesizer of claim 14 , wherein said analog restitution filter comprises:

one or more of a passive filter;

a resistive-inductive-capacitive (R-L-C) circuit; and

a transmission line.

18. The digital RF input signal synthesizer of claim 14 , wherein said digital stream is substantially equal to said input digital RF signal.

19. The digital RF input signal synthesizer of claim 14 , wherein said maximum likelihood sequence estimation incorporates and compensates for a non-linear memory of an RF power amplifier or digital driver analog circuit.

20. The digital RF input signal synthesizer of claim 14 , wherein said prototype filter has a frequency response that is similar to said restitution filter.

21. A system for digital RF input signal synthesis, comprising:

a memory; and

at least one hardware device, coupled to the memory, operative to:

perform maximum likelihood sequence estimation on said digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error, wherein said maximum likelihood sequence estimation comprises an M algorithm and wherein said prototype filter comprises an infinite impulse response (IIR) filter; and

apply said digital stream to a switching type power amplifier followed by an analog restitution filter.

22. The system of claim 21 , wherein said substantially minimum error comprises a difference between a digital output of said prototype filter and said digital RF input signal.

23. The system of claim 21 , wherein an output of said analog restitution filter comprises an analog RF signal that approximates said digital RF input signal.

24. The system of claim 21 , wherein said analog restitution filter comprises:

one or more of a passive filter;

a resistive-inductive-capacitive (R-L-C) circuit; and

a transmission line.

25. The system of claim 21 , wherein said digital stream is substantially equal to said input digital RF signal.

26. The system of claim 21 , wherein said maximum likelihood sequence estimation incorporates and compensates for a non-linear memory of an RF power amplifier or digital driver analog circuit.

27. The system of claim 21 , wherein said prototype filter has a frequency response that is similar to said restitution filter.