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Non-orthogonal coding techniques for optical sensing

  • US 9,430,097 B2
  • Filed: 09/30/2013
  • Issued: 08/30/2016
  • Est. Priority Date: 09/30/2013
  • Status: Active Grant
First Claim
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1. A processing system for optical sensing, comprising:

  • transmitter circuitry coupled a first optical transmitter and a second optical transmitter, the transmitter circuitry configured to;

    drive the first optical transmitter with a first optical coded signal based on a first code, anddrive the second optical transmitter with a second optical coded signal based on a second code,wherein the first code and the second code are non-orthogonal,wherein the first code is a first pseudorandom noise (PN) code and the second code is a second PN code, andwherein the first optical transmitter and the second optical transmitter transmit at overlapping times; and

    a receiver circuitry coupled to an optical receiver and configured to receive a resulting signal comprising effects corresponding to the first optical coded signal and effects corresponding to the second optical coded signal,wherein the processing system is configured to;

    determine a first measurement between the first optical transmitter and the optical receiver based on the resulting signal and the first code,determine a second measurement between the second optical transmitter and the optical receiver based on the second code and the resulting signal, anddetermine a plurality of positional information for an input object based on the first measurement and the second measurement.

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