Abstract
We consider optical camera communication (OCC) between a camera receiver with optical lens and distributed transmitters. This paper investigates the features of an OCC system when the periods of reception and transmission are slightly different from each other. We describe a received light signal model for the system and cost functions to be minimized to demodulate the transmitted bit sequences. The demodulation procedure uses a maximum-likelihood sequence detection method, which can be implemented by the Viterbi algorithm, and estimates parameters by individually minimizing the cost functions for the each of parameter. Our new method can demodulate the signal even when the receiver is not given the transmission period, which a conventional method must know in advance. To confirm the efficiency of our developed method, we conducted numerical simulations and compared the results with those from an oracle estimator that knows parameters other than the bit sequence in advance.
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