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This paper is a useful contribution to the literature because it combines the analytics for the case of anisotropic scatter (following Rino) and the solution of the forth-order moment equation, in the strong scatter approximation.  However, it is not original and should not be published in the IEEE Transactions of Antennas and Propagation.
The paper is technically clear and well organized, but needs an English-speaking editor to correct the many language usage problems.  Also there are numerous typos in the section of Reference, including Refs 19, 25, 33.
The section on decorrelation distance (the paper calls this quantity ¡°coherent length¡±) after two-way propagation is a bit confusing, as follows.  For one-way propagation, let us transmit a wave upwards from a point source through a distance z to a plane.  Let this be a two-dimensional example, so that the received field is a function only of x and the propagation distance z.  Then we can consider the decorrelation function between the field at two points x1 and x2 in the plane z.  The value of the distance x1-x2 where the decorrelation falls off to 1/e is the decorrelation distance.
Now for the case of two-way propagation, we transmit again a wave upwards from a point source a distance z to a plane.  Call this plane the reflecting plane.  Next the wave travels downwards back to the transmitter plane where it can be measured.  In this case, the decorrelation distance depends on the details of the reflection point(s) after the first (upwards) transmission.  If the plane is perfectly reflecting, one would measure a certain decorrelation distance.  If there were only a single point scatterer at the reflecting plane, then the decorrelation distance would be identical to that measured for one-way propagation in the downwards direction from the reflecting plane back to the plane where the transmitter is located.  It seems that this is the only consistent definition of the decorrelation distance that is useful to the case of two-way propagation.  Otherwise, the decorrelation distance depends on the redflecting plane, which can¡¯t be correct.
This issue should be addressed in any revisions of this paper.
The paper would be a useful addition to the Antennas and Propagation Journal.
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