Estimation of NLOS optical wireless communication channels with laser transmitters

We propose channel estimation for the optical wireless scattering channel with a Laser Diode transmitter based on sparse pilots. For channel taps {h<sub>n</sub>}<sup>L</sup><sub>n=0</sub>, the proposed estimation approach consists of two steps, the estimation of the real part Re(h<sub>i</sub>h<sup>*</sup><sub>j</sub>) in the first step and the estimation of {h<sub>n</sub>}<sup>L</sup><sub>n=0</sub> in the second step. Numerical results show that, compared with conventional channel estimation approach based on second-order moments, the proposed approach shows slight performance gain, and less than one tenth of the computational complexity.

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