We consider the power allocation of optical wireless scattering communication over multi-wavelength parallel channels. We formulate the power allocation problems that aim to maximize the transmission rate or minimize the linear minimum mean square error (LMMSE) distortion. We consider two scenarios, where the parallel channels are aggregated for single-user transmission or separated for different users. For the latter, we resort to a fairness criterion to maximize the minimum transmission rate or minimize the maximum estimation distortion. The power allocation for both photon-counting and photomultiplier tubes (PMT) receivers are taken into consideration. Numerical and simulation results show the significant performance gain of the proposed optimal power allocation over equal power allocation among the parallel channels, which is typically more than 1dB and can reach up to 2dB.
['Beiyuan Liu', 'Chen Gong', 'Zhengyuan Xu']
Power optimization of multiple-wavelength optical wireless scattering communication