Channel Estimation and Signal Detection of Pulse Code Modulated Optical Scattering Communication

For developing the receiver side digital signal processing techniques, necessary for the non-line of sight (NLOS) optical wireless scattering communication channel model. A linear time-invariant (LTI) Poisson channel modeling method, to model the NLOS optical wireless scattering communication, which was originally proposed for molecular communication is considered. In such a model the stochastic inter-symbol interference (ISI) is analyzed. The transmitter side is characterized by the pulse code modulation (PCM) and transmitted through the above. The channel estimation schemes, based on the least squares and correlation criteria is done, and analyzed the performance of the proposed channel estimation schemes. Also two signal detection schemes, namely the simple linear minimum mean square error (LMMSE) receiver treating ISI as noise and the maximum-likelihood sequence detection (MLSD) scheme that takes ISI into account and compared the same. PCM gives the fastest transmission and better SNR value than that of PPM. This paper presents a novel and effective study of the performance of the channel using PCM and the comparison of the same with PPM.