Iterative multi-level equalization and decoding

1. A wireless communication method for transmitting orthogonal time frequency space (OTFS) modulated wireless signals from a transmitter, comprising:

receiving information bits for transmission;

segmenting the information bits into a stream of segments;

applying a corresponding forward error correction (FEC) code to each of the stream of segments and combining outputs of the FEC codes to generate a first stream of symbols;

transforming, using an OTFS transformation comprising a symplectic transform, the first stream of symbols into a second stream of symbols;

processing the second stream of symbols to generate a waveform; and

transmitting the waveform over a communication medium.

2. The method of claim 1 , wherein each segment in the stream of segments has an equal bit length.

3. The method of claim 1 , wherein at least some of the FEC codes have different block sizes from each other.

4. The method of claim 1 , wherein each segment in the stream of segments is applied to one or more constellation symbol labels.

5. The method of claim 1 , wherein the combining the outputs of the FEC codes includes:

performing, on an output of each FEC, a corresponding interleaving operation; and

combining outputs of the interleaving operations to generate the first stream of symbols.

6. The method of claim 1 , wherein different FEC codes are used for header and payload portions of the information bits.

7. A wireless communication method, implemented at a receiver-side, for receiving a signal comprising multiple symbols; comprising:

performing channel equalization on the signal to generate a first channel equalized signal;

transforming, using an inverse orthogonal time frequency space (OTFS) transformation comprising an inverse symplectic transform, the first channel equalized signal into a second channel equalized signal;

logically dividing second the channel equalized signal into a first number of segments;

demodulating and symbol de-mapping the channel equalization signal in successive steps such that each step operates to recover one or more bits of one of the first number of segments to generate a demodulated bitstream, wherein an order in which the successive steps are performed depends on a reliability of success of recovering the one or more bits in each of the successive steps;

processing the demodulated bitstream to generate information related to the bits from the signal; and

providing a feedback signal to the channel equalization operation based on the processing of the demodulated bitstream.

8. The method of claim 7 , wherein the processing the demodulated bitstream comprises forward error correction decoding using a plurality of forward error correction codes, at least some of which have different block sizes.

9. The method of claim 7 , wherein the providing the feedback signal comprises performing symbol mapping and an orthogonal time frequency space (OTFS) transformation to generate the feedback signal.

10. The method of claim 7 , wherein the order of which the successive steps are performed is from the most reliable bit to the least reliable bit.

11. The method of claim 7 , wherein the processing the demodulated bitstream comprises deinterleaving each segment of the first number of segments, and forward error correction decoding using a plurality of forward error correction codes, at least some of which have different block sizes, outputs of the deinterleaving of the first number of segments.

12. The method of claim 7 , wherein the providing the feedback signal comprises interleaving, the recovered one or more bit-related information from each of the first number of segments using a corresponding interleaver depth.

13. A wireless communication device comprising a processor configured to implement a method for transmitting orthogonal time frequency space (OTFS) modulated wireless signals from a transmitter the method comprising:

receiving information bits for transmission;

segmenting the information bits into a stream of segments;

applying a corresponding forward error correction (FEC) code to each of the stream of segments and combining outputs of the FEC codes to generate a first stream of symbols;

transforming, using an orthogonal time frequency space (OTFS) transformation comprising a symplectic transform, the first stream of symbols into a second stream of symbols;

processing the second stream of symbols to generate a waveform; and

transmitting the waveform over a communication medium.

14. A non-transitory computer-readable memory storing instructions comprising processor-implementable code, wherein the code include instructions which, when executed by the processor, cause the processor to implement method for transmitting orthogonal time frequency space (OTFS) modulated wireless signals from a transmitter, comprising:

instructions for receiving information bits for transmission;

instructions for segmenting the information bits into a stream of segments;

instructions for applying a corresponding forward error correction (FEC) code to each of the stream of segments and combining outputs of the FEC codes to generate a stream of symbols;

instructions for transforming, using an orthogonal time frequency space (OTFS) transformation comprising a symplectic transform, the first stream of symbols into a second stream of symbols;

instructions for processing the second stream of symbols to generate a waveform; and

instructions for transmitting the waveform over a communication medium.

15. A wireless communication device comprising a processor configured to implement a method for receiving a signal comprising multiple symbols, the method comprising:

performing channel equalization on the signal to generate a first channel equalized signal;

transforming, using an inverse orthogonal time frequency space (OTFS) transformation comprising an inverse symplectic transform, the first channel equalized signal into a second channel equalized signal;

logically dividing the second channel equalized signal into a first number of segments;

demodulating and symbol de-mapping the channel equalization signal in successive steps such that each step operates to recover one or more bits of one of the first number of segments to generate a demodulated bitstream, wherein an order in which the successive steps are performed depends on a reliability of success of recovering the one or more bits in each of the successive steps;

processing the demodulated bitstream to generate information related to the bits from the signal; and

providing a feedback signal to the channel equalization operation based on the processing of the demodulated bitstream.

16. The wireless communication device of claim 15 , wherein the processing the demodulated bitstream comprises forward error correction decoding using a plurality of forward error correction codes, at least some of which have different block sizes.

17. A non-transitory computer-readable memory storing instructions comprising processor-implementable code, wherein the code includes instructions which, when executed by the processor, causes the processor to implement method for receiving a signal comprising multiple symbols, comprising:

instructions for performing channel equalization on the signal to generate a first channel equalized signal;

instructions for transforming, using an inverse orthogonal time frequency space (OTFS) transformation comprising an inverse symplectic transform, the first channel equalized signal into a second channel equalized signal;

instructions for logically dividing the second channel equalized signal into a first number of segments;

instructions for demodulating and symbol de-mapping the channel equalization signal in successive steps such that each step operates to recover one or more bits of one of the first number of segments to generate a demodulated bitstream, wherein an order in which the successive steps are performed depends on a reliability of success of recovering the one or more bits in each of the successive steps;

instructions for processing the demodulated bitstream to generate information related to the bits from the signal; and

instructions for providing a feedback signal to the channel equalization operation based on the processing of the demodulated bitstream.

18. The non-transitory computer-readable memory of claim 17 , wherein the processing the demodulated bitstream comprises forward error correction decoding using a plurality of forward error correction codes, at least some of which have different block sizes.