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Apparatus and method for increased data rates in underwater communications using orbital angular momentum

  • US 10,103,799 B2
  • Filed: 03/15/2016
  • Issued: 10/16/2018
  • Est. Priority Date: 03/16/2015
  • Status: Active Grant
First Claim
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1. An underwater optical communications system including a transmitter and a receiver;

  • the transmitter is configured to receive input data and to generate a plurality of orbital angular momentum optical signals based on the input data, the transmitter is configured to multiplex the plurality of orbital angular momentum optical signals into a single multiplexed optical signal and the transmitter is configured to transmit the plurality of orbital angular momentum optical signals into a water medium by transmitting the single multiplexed optical signal into the water medium; and

    the receiver is configured to receive the plurality of orbital angular momentum optical signals and to generate output data from the received plurality of orbital angular momentum optical signals;

    wherein the receiver is configured to analyze the received plurality of orbital angular momentum optical signals for channel performance and to generate channel state information based on the channel performance;

    an optical feedback channel from the receiver to the transmitter that provides the generated channel state information from the receiver to the transmitter; and

    the transmitter is configured to adjust a power allocation among a plurality of subsequently generated orbital angular momentum optical signals based on the channel state information received from the receiver;

    the transmitter is configured to process additional input data using the channel state information received from the receiver;

    the transmitter is configured to produce a plurality of radio frequency (RF) signals based on the additional input data;

    the transmitter is configured to modulate the plurality of RF signals onto optical signals produced by lasers corresponding to each RF signal to produce modulated optical signals;

    the transmitter configured to convert each modulated optical signal into the subsequently generated orbital angular momentum optical signals;

    the transmitter is configured to multiplex each of the subsequently generated orbital angular momentum optical signals into a new single multiplexed orbital angular momentum optical signal;

    the transmitter is configured to transmit the new multiplexed orbital angular momentum optical signal into the water medium;

    the receiver is configured to receive the new multiplexed orbital angular momentum optical signal;

    the receiver is configured to analyze the received new multiplexed orbital angular momentum optical signal for channel performance to identify new channel state information;

    the receiver is configure to define a plurality of pre-coding values based on the new channel state information;

    the receiver is configured to map the plurality of pre-coding values to an entry in a codebook, the entry identifying the plurality of pre-coding values;

    the receiver is configured to transmit the codebook entry to the transmitter;

    the transmitter is configured to identify a plurality of pre-coding values from the received codebook entry; and

    the transmitter is configured to process a next portion of input data for transmission using the pre-coding values.

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