Abstract
We investigate the multi-layer superimposed transmission for optical wireless scattering communication where the symbol boundaries on different signal layers are not necessarily aligned in the time domain. We characterize the multi-layer transmission based on a hidden markov model, and propose approaches on the channel estimation as well as joint symbol detection and decoding. Finally, both simulations and experiments are conducted to evaluate the performance of the proposed approaches, and validate the feasibility of the proposed transmission and signal detection approaches.
Highlights
Optical wireless communication can serve as an effective supplement of conventional radiofrequency (RF) communication, due to its potential large bandwidth and capacity [2]
Discrete Poisson channel model is both valid and precise enough for Non-line of sight (NLOS) scattering communication based on photon-counting detection, which makes it feasible to theoretically investigate the receiver-side signal processing [10], [11]; and its preciseness has been verified by the experiments in [12], [13] as well as the realization of FPGA-based real-time scattering communication systems in [14]
It is seen that the experimental results on the channel estimation, symbol detection and joint detection/decoding are close to the simulation results, which illustrates the feasibility of the proposed channel estimation and signal detection approaches in real communication scenarios
Summary
Optical wireless communication can serve as an effective supplement of conventional radiofrequency (RF) communication, due to its potential large bandwidth and capacity [2]. Discrete Poisson channel model is both valid and precise enough for NLOS scattering communication based on photon-counting detection, which makes it feasible to theoretically investigate the receiver-side signal processing [10], [11]; and its preciseness has been verified by the experiments in [12], [13] as well as the realization of FPGA-based real-time scattering communication systems in [14]. Other existing works on NLOS UV scattering communication based on the Poisson and extended channel model are the channel link gain with impulse response [27], [28], channel estimation with inter-symbol interference [29], signal detection with receiver diversity [30], and relay protocol [31].
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