System and method including modified bit-interleaved coded modulation
First Claim
Patent Images
1. A system comprising:
- a plurality of first forward error correction (FEC) code encoders, each of said first FEC code encoders being configured to encode an associated input signal using a first FEC code and provide an associated first FEC code encoded output;
an interleaver coupled to at least one of said plurality of first FEC code encoders and configured to provide an interleaved output comprising at least a portion of said associated first FEC code encoded output of said at least one of said plurality of first FEC code encoders;
a second FEC code encoder coupled to said interleaver and configured to encode said interleaved output with a second FEC code and provide a second FEC code encoded output;
a modulator coupled to said second FEC code encoder and configured to modulate an optical signal in response to said second FEC code encoded output to provide a modulated output signal;
a second FEC decoder configured to receive a signal representative of said modulated output signal and decode said signal using said second FEC code to provide a second FEC code decoded output signal;
an de-interleaver coupled to said second FEC decoder and configured to provide a plurality of de-interleaved outputs in response to said second FEC code decoded output signal;
a plurality of first FEC code decoders, each of said first FEC code decoders being configured to receive an associated one of said de-interleaved outputs and provide an associated first FEC code decoded output signal;
a multiplexer configured to receive each of said first FEC code decoded output signals and multiplex said first FEC code decoded output signals into a serial output data stream; and
an interleaver configured to interleave said output data stream to provide feedback to the second FEC decoder.
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Abstract
A system and method with a modified bit-interleaved coded modulation with iterative decoding (BICM-ID). Coded and interleaved bits are combined and coded with a second FEC code that is then mapped to a modulation format. The second FEC code may be a single parity check (SPC) and the scheme may be referred to as a SPC-BICM-ID scheme.
34 Citations
18 Claims
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1. A system comprising:
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a plurality of first forward error correction (FEC) code encoders, each of said first FEC code encoders being configured to encode an associated input signal using a first FEC code and provide an associated first FEC code encoded output; an interleaver coupled to at least one of said plurality of first FEC code encoders and configured to provide an interleaved output comprising at least a portion of said associated first FEC code encoded output of said at least one of said plurality of first FEC code encoders; a second FEC code encoder coupled to said interleaver and configured to encode said interleaved output with a second FEC code and provide a second FEC code encoded output; a modulator coupled to said second FEC code encoder and configured to modulate an optical signal in response to said second FEC code encoded output to provide a modulated output signal; a second FEC decoder configured to receive a signal representative of said modulated output signal and decode said signal using said second FEC code to provide a second FEC code decoded output signal; an de-interleaver coupled to said second FEC decoder and configured to provide a plurality of de-interleaved outputs in response to said second FEC code decoded output signal; a plurality of first FEC code decoders, each of said first FEC code decoders being configured to receive an associated one of said de-interleaved outputs and provide an associated first FEC code decoded output signal; a multiplexer configured to receive each of said first FEC code decoded output signals and multiplex said first FEC code decoded output signals into a serial output data stream; and an interleaver configured to interleave said output data stream to provide feedback to the second FEC decoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical signal receiver comprising:
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a second forward error correction (FEC) decoder configured to receive an interleaved signal encoded with first and second FEC codes and decode said signal using said second FEC code to provide a second FEC code decoded output signal; a de-interleaver coupled to said second FEC decoder and configured to provide a plurality of de-interleaved outputs in response to said second FEC code decoded output signal; a plurality of first FEC code decoders, each of said first FEC code decoders being configured to receive an associated one of said de-interleaved outputs and provide an associated first FEC code decoded output signal; a multiplexer configured to receive each of said first FEC code decoded output signals and multiplex said first FEC code decoded output signals into a serial output data stream; and an interleaver configured to interleave said output data stream to provide feedback to the second FEC decoder. - View Dependent Claims (10, 11, 12)
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13. A method comprising:
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encoding each of a plurality of data streams using a first forward error correction (FEC) code to provide a plurality of first FEC code encoded data streams; interleaving said first FEC code encoded data streams to provide at least one interleaved output; encoding said interleaved output using a second FEC code to provide a second FEC code encoded data stream; modulating an optical signal to provide a modulated output signal representative of said second FEC code encoded data stream; decoding a signal representative of said modulated output signal using said second FEC code to provide a second FEC code decoded output; de-interleaving said second FEC code decoded output to provide a plurality of de-interleaved outputs; decoding said de-interleaved outputs using said first FEC code to provide a plurality of first FEC code decoded outputs; multiplexing said first FEC code decoded outputs to provide an output data signal; providing feedback by providing at least a portion of the output data signal for use in said decoding said signal representative of said modulated output signal using said second FEC code; and iterating said decoding using said second FEC code, said de-interleaving, said decoding using said first FEC code, said multiplexing, and said providing feedback. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification