Particle stream channel modeling and estimation for non-line of sight optical wireless communication

A statistical channel model for the non-line of sight (NLOS) scattering optical wireless communication link, is fundamental for developing further receiver-side digital signal processing techniques. Assume an optical source emits energy units, which produces transmitted particles experiencing independent random delays. This is termed as particle stream channel (PSC) in this work, characterizing stochastic inter-symbol interference based on a delay profile. For signal detection, we derive the first- and second-order moment statistics for the received signals. We propose channel estimation schemes to estimate the channel parameters, based on the least-squares and correlation criteria. Numerical results show that the channel estimation work well for the particle stream channel.