Forward error correction with parity check encoding for use in low complexity highly-spectrally efficient communications

1. A method, comprising:

in a transmitter:

inserting parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols;

pulse shaping said information symbols by a first pulse shaping filter characterized by a first response;

pulse shaping said parity samples by a second pulse shaping filter characterized by a second response, wherein said first response and said second response are diverse; and

generating said parity samples utilizing a parity function over a plurality of said information symbols;

wherein:

said parity function comprises a non-linear function, and said non-linear function is diverse from a partial response signal convolution corresponding to said information symbols; and

said parity function is determined according to a desired SNR range at a receiver.

2. A method comprising:

in a transmitter:

inserting parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols;

pulse shaping said information symbols by a first pulse shaping filter characterized by a first response;

pulse shaping said parity samples by a second pulse shaping filter characterized by a second response, wherein said first response and said second response are diverse; and

transmitting said inter-symbol correlated signal comprising said pulse shaped information symbols and said pulse shaped parity samples, wherein a power of said parity samples is optimized for best sequence estimation and best symbol error rate (SER) performance.

3. The method according to claim 2 , comprising generating said parity samples utilizing a parity function over a plurality of said information symbols.

4. The method according to claim 3 , wherein:

said parity function comprises a non-linear function, and said non-linear function is diverse from a partial response signal convolution corresponding to said information symbols; and

said parity function is designed according to a desired SNR range at a receiver.

5. The method according to claim 3 , wherein said parity function incorporates a memory depth, which is larger than a memory of a partial response corresponding to taps of said first pulse shaping filter.

6. The method according to claim 5 , wherein:

said parity function operates over adjacent ones of said information symbols; and

corresponding intervals among said adjacent information symbols are dependent on one or both of: a length of an error event and an SNR operating range.

7. The method according to claim 2 , comprising:

inserting said parity samples between consecutive ones of said information symbols to generate a combined stream; and

convolving said combined stream with corresponding taps of said first pulse shaping filter.

8. The method according to claim 2 , wherein a parity metric is generated from said inserted parity samples, and said generated parity metric is utilized to select a best one or more of said generated estimates of said corresponding received information symbols and/or a best one or more paths of said corresponding information symbols.

9. A method comprising:

in a transmitter:

inserting parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols;

pulse shaping said information symbols by a first pulse shaping filter characterized by a first response;

pulse shaping said parity samples by a second pulse shaping filter characterized by a second response, wherein said first response and said second response are diverse;

generating said parity samples utilizing a parity function over a plurality of said information symbols; and

wherein:

said parity function incorporates a memory depth, which is larger than a memory of a partial response corresponding to taps of said first pulse shaping filter;

a non-linear function and/or a linear function utilized for said parity function incorporates a modulo operation that ensures that an amplitude of corresponding values of parity samples are maintained in a particular range; and

said modulo operation operates in a two dimensional (2D) domain.

10. A system, comprising:

one or more processors and/or circuits for use in a transmitter, said one or more processors and/or circuits being operable to:

insert parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols; and

generate said parity samples utilizing a parity function over a plurality of said information symbols;

wherein:

said one or more processors and/or circuits comprise a first pulse shape filter characterized by a first response, said first pulse shaping filter being operable to pulse shape said information symbols;

said one or more processors and/or circuits comprise a second pulse shaping filter characterized by a second response, said second pulse shaping filter being operable to pulse shape said parity samples;

said parity function comprises a non-linear function, and said non-linear function is diverse from a partial response signal convolution corresponding to said information symbols; and

said parity function is designed according to a desired SNR range at a receiver.

11. A system comprising:

one or more processors and/or circuits for use in a transmitter, wherein:

said one or more processors and/or circuits are operable to insert parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols;

said one or more processors and/or circuits are operable to transmit said inter-symbol correlated signal comprising said pulse shaped information symbols and said pulse shaped parity samples, wherein a power of said parity samples is optimized for best sequence estimation and best symbol error rate (SER) performance;

said one or more processors and/or circuits comprise a first pulse shape filter characterized by a first response, said first pulse shaping filter being operable to pulse shape said information symbols; and

said one or more processors and/or circuits comprise a second pulse shaping filter characterized by a second response, said second pulse shaping filter being operable to pulse shape said parity samples.

12. The system according to claim 11 , wherein said one or more processors and/or circuits are operable to generate said parity samples utilizing a parity function over a plurality of said information symbols.

13. The system according to claim 12 , wherein:

said parity function comprises a non-linear function, and said non-linear function is diverse from a partial response signal convolution corresponding to said information symbols; and

said parity function is designed according to a desired SNR range at a receiver.

14. The system according to claim 12 , wherein said parity function incorporates a memory depth, which is larger than a memory of a partial response corresponding to taps of said first pulse shaping filter.

15. The system according to claim 14 , wherein:

said parity function operates over adjacent information symbols; and

corresponding intervals among said adjacent information symbols are dependent on one or both of: a length of an error event and/or an SNR operating range.

16. The system according to claim 11 , wherein said one or more processors and/or circuits are operable to:

insert said parity samples between consecutive ones of said information symbols to generate a combined stream; and

convolve said combined stream with corresponding taps of said first pulse shaping filter.

17. The system according to claim 11 , wherein a parity metric is generated from said inserted parity samples, and said generated parity metric is utilized to select a best one or more of said generated estimates of said corresponding received information symbols and/or a best one or more paths of said corresponding information symbols.

18. A system comprising:

one or more processors and/or circuits for use in a transmitter, wherein:

said one or more processors and/or circuits are operable to insert parity samples into a stream of information symbols in an inter-symbol correlated (ISC) signal, wherein said inserted parity samples are utilized to generate estimates of corresponding received information symbols;

said one or more processors and/or circuits are operable to generate said parity samples utilizing a parity function over a plurality of said information symbols;

said one or more processors and/or circuits comprise a first pulse shape filter characterized by a first response, said first pulse shaping filter being operable to pulse shape said information symbols;

said one or more processors and/or circuits comprise a second pulse shaping filter characterized by a second response, said second pulse shaping filter being operable to pulse shape said parity samples;

said parity function incorporates a memory depth, which is larger than a memory of a partial response corresponding to taps of said first pulse shaping filter;

a non-linear function and/or a linear function utilized for said parity function incorporates a modulo operation that ensures that an amplitude of corresponding values of parity samples are maintained in a particular range; and

said modulo operation operates in a two dimensional (2D) domain.