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Our recent work in which we study the propagation of the
general Hermite-sinusoidal-Gaussian laser beams in wireless
broadband access telecommunication systems is elaborated in
this paper to cover the special case of an off-axis Gaussian
beam. We mainly investigate the propagation characteristics in
atmospheric turbulence of an off-axis Gaussian beam
possessing Gaussian distributed random displacement
parameters. Our interest is to search for different types of laser
beams that will improve the performance of a wireless
broadband access system when atmospheric turbulence is
considered. Our formulation is based on the basic solution of
the second order mutual coherence function evaluated at the
receiver plane. For fixed turbulence strength, the coherence
length calculated at the receiver plane is found to decrease as
the variance of the random displacement is increased. It is
shown that as the turbulence becomes stronger, coherence
lengths due to off-axis Gaussian beams tend to approach the
same value, irrespective of the variance of the random
displacement. As expected, the beam spreading is found to be
pronounced for larger variance of displacement parameter.
Average intensity profiles when atmospheric turbulence is
present are plotted for different values of the variance of the
random displacement parameter of the off-axis Gaussian beam.
