Trellis Based Processing for Robust Digital Multiband Transmission

A signal processor for digitally processing a digital multi-band (DMB) signal comprising a set of frequency bands on a single carrier, the signal processor comprising:

• a digital demultiplexer for demultiplexing the DMB signal into respective digital signals on separate first and second frequency bands of the set of frequency bands;
• a plurality of trellis based processors (TBPs), each trellis based processor adaptively configurable for mitigating inter-symbol interference (ISI) or phase noise PN of the digital signals on one of the first and second frequency bands;
• and
• a TBP mode selector adapted for configuring one or more TBPs to process the digital signals on the first or second frequency bands to mitigate one of the ISI or the PN.

A receiver for receiving an optical multi-band (DMB) signal, the receiver comprising:

• a coherent detector for detecting the optical DMB signal;
• an analog to digital converter for converting the optical DMB signal detected by the coherent detector into a digital DMB signal comprising a set of frequency bands on a single carrier;
• a digital demultiplexer for demultiplexing the DMB signal into respective digital signals on separate first and second frequency bands of the set of frequency bands;
• a plurality of trellis based processors (TBPs), each trellis based processor adaptively configurable for mitigating inter-symbol interference (ISI) or phase noise PN of the digital signals on one of the first and second frequency bands;
• and
• a TBP mode selector adapted for configuring one or more TBPs to process the digital signals on the first or second frequency bands to mitigate one of the ISI or the PN.

A transmitter for transmitting an optical digital multi-band (DMB) signal, the transmitter comprising:

• a plurality of modulation mappers, each modulation mapper configured to transform a plurality of streams of bits into a frequency domain to provide corresponding digital signals on a set of frequency bands;
• a plurality of power allocators, each power allocator configured to allocate a transmit power to a digital signal on a corresponding frequency band of the set of frequency bands based on a modulation format of each stream of symbols;
• and
• a plurality of frequency-domain pulse shaping filters, each frequency-domain pulse shaping filter configured to filter the digital signal on the corresponding frequency band of the set of frequency bands based on a modulation format of each stream of symbols.