Convolutional Coded DPIM for Indoor Optical Wireless Links

In this paper we evaluate the performance of digital pulse interval modulation (DPIM) with convolutional coding for different values of bit resolution and different sizes of guard bands. We show that convolutional coding is an effective method of improving the error performance of DPIM over optical wireless links. The convolutional coded DPIM with a guard band of 2 slots has the advantage of fixed header pattern so that decoding is simple with no need for Viterbi decoding. It also achieves a code gain of more than 4 dB compared to standard DPIM with 2 guard slot at slot error rate of 10.