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Visible light communication (VLC)-based beacon systems, which usuallytransmit identification (ID) information in small-size data frames are appliedwidely in indoor localization applications. There is one fact that flicker ofLED light should be avoid in any VLC systems. Current flicker mitigationsolutions based on run-length limited (RLL) codes suffer from reduced coderates, or are limited to hard-decoding forward error correction (FEC) decoders.Recently, soft-decoding techniques of RLL-codes are proposed to supportsoft-decoding FEC algorithms, but they contain potentials of high-complexityand time-consuming computations. Fortunately, non-RLL direct current(DC)-balance solutions can overcome the drawbacks of RLL-based algorithms,however, they meet some difficulties in system latency or inferiorerror-correction performances. Recently, non-RLL flicker mitigation solutionbased on Polar code has proved to be an optimal approach due to its naturalequal probabilities of short runs of 1's and 0's with high error-correctionperformance. However, we found that this solution can only maintain the DCbalance only when the data frame length is sufficiently long. Accordingly,short beacon-based data frames might still be a big challenge for flickermitigation in such non-RLL cases. In this paper, we introduce a flickermitigation solution designed for VLC-based beacon systems that combines asimple pre-scrambler with a Polar encoder which has a codeword smaller than theprevious work 8 times. We also propose a hardware architecture for the proposedcompact non-RLL VLC receiver for the first time. Also, a 3-bit soft-decisionfilter is introduce to enable soft-decoding of Polar decoder to improve theperformance of the receiver.

Hardware Implementation of A Non-RLL Soft-decoding Beacon-based Visible Light Communication Receiver