Signal acquisition in a multimode environment

1. A transmitter comprising:

a symbol mapping circuit configured to map a frame of bits to a frame of symbols, said symbols corresponding to a determined modulation scheme; and

circuitry configured to convert said frame of symbols to a physical layer signal and transmit said physical layer signal onto a communication medium,

wherein:

said circuitry comprises a nonlinear distorter circuit configured to process said physical layer signal such that a first portion of said physical layer signal not including payload data is a linear signal and a second portion of said physical layer signal including payload data is a nonlinear signal.

2. The transmitter of claim 1 , wherein said first portion of said physical layer signal comprises a header of said frame and said second portion of said physical layer signal comprises a payload of said frame.

3. The transmitter of claim 2 , wherein:

said nonlinear distorter circuit comprises a predistortion circuit;

said predistortion circuit introduces more nonlinear distortion to said payload of said frame than to said header of said frame.

4. The transmitter of claim 2 , wherein:

said nonlinear distorter circuit comprises a power amplifier;

said power amplifier operates in a linear response region during processing of said header of said frame; and

said power amplifier operates in a nonlinear response region during processing of said payload of said frame.

5. The transmitter of claim 1 , wherein said first portion of said physical layer signal comprises a header of said frame and said second portion of said physical layer signal comprises a preamble of said frame.

6. The transmitter of claim 5 , wherein:

said nonlinear distorter circuit comprises a predistortion circuit;

said predistortion circuit introduces more nonlinear distortion to said preamble of said frame than to said header of said frame.

7. The transmitter of claim 5 , wherein:

said nonlinear distorter circuit comprises a power amplifier;

said power amplifier operates in a linear response region during processing of said header of said frame; and

said power amplifier operates in a nonlinear response region during processing of said preamble of said frame.

8. The transmitter of claim 1 , wherein said first portion of said physical layer signal comprises a header of said frame, and said second portion of said physical layer signal comprises a preamble of said frame and a payload of said frame.

9. The transmitter of claim 8 , wherein:

said nonlinear distorter circuit comprises a predistortion circuit;

said predistortion circuit introduces more nonlinear distortion to said preamble of said frame and said payload of said frame than to said header of said frame.

10. The transmitter of claim 8 , wherein:

said nonlinear distorter circuit comprises a power amplifier;

said power amplifier operates in a linear response region during processing of said header of said frame; and

said power amplifier operates in a nonlinear response region during processing of said payload of said frame and said preamble of said frame.

11. The transmitter of claim 1 , wherein said first portion of said physical layer signal comprises a first preamble of said frame and a header of said frame, and said second portion of said physical layer signal comprises a second preamble of said frame and a payload of said frame.

12. The transmitter of claim 11 , wherein:

said nonlinear distorter circuit comprises a predistortion circuit;

said predistortion circuit introduces more nonlinear distortion to said second preamble of said frame and said payload of said frame than to said header of said frame and said first preamble of said frame.

13. The transmitter of claim 11 , wherein:

said nonlinear distorter circuit comprises a power amplifier;

said power amplifier operates in a linear response region during processing of said header of said frame and said first preamble of said frame; and

said power amplifier operates in a nonlinear response region during processing of said payload of said frame and said second preamble of said frame.

14. The transmitter of claim 1 , wherein said second portion of said physical layer signal is an inter-symbol correlated signal.

15. A transmitter comprising:

a symbol mapping circuit configured to map a frame of bits to a frame of symbols, said symbols corresponding to a determined modulation scheme; and

circuitry operable to convert said frame of symbols to a physical layer signal and transmit said physical layer signal onto a communication medium,

wherein:

said circuitry comprises an inter-symbol correlated (ISC) signal generator configured to process said physical layer signal such that a first portion of said physical layer signal not including payload data is a non-ISC signal and a second portion of said physical layer signal including payload data is an ISC signal.

16. The transmitter of claim 15 , wherein said first portion of said physical layer signal comprises a header of said frame and said second portion of said physical layer signal comprises a payload of said frame.

17. The transmitter of claim 15 , wherein said first portion of said physical layer signal comprises a header of said frame and said second portion of said physical layer signal comprises a preamble of said frame.

18. The transmitter of claim 15 , wherein said first portion of said physical layer signal comprises a header of said frame, and said second portion of said physical layer signal comprises a preamble of said frame and a payload of said frame.

19. The transmitter of claim 15 , wherein said first portion of said physical layer signal comprises a first preamble of said frame and a header of said frame, and said second portion of said physical layer signal comprises a second preamble of said frame and a payload of said frame.

20. The transmitter of claim 15 , wherein said second portion of said physical layer signal is a nonlinear signal.