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stds-802-16: TG1 COMMENT

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[Detailed Description of Proposed Insertion, Deletion, Change]
Insert input under "4.8.1 Propagation Conditions"

[Reason for Edit]
To provide an input in draft #1

Line of sight radio propagation conditions between base station and
subscriber stations are required, to achieve high quality and
availability service. Also, the subscriber stations need highly
directional antennas, which minimize the number of multipaths and
interference from unexpected sources. The intersymbol interference may
occur as a consequence of multipaths.

The severest propagation impairment is rain fade that may be estimated
using ITU-R model [1] or Crane model [2]. Other impairments such as
depolarization and loss due to atmospheric gases [1] are considered

[1] ITU-R Recommendation P.530-7, Propagation Data and Prediction
Methods Required for
      the Design of Terrestrial Line-of-Sight Systems. 1997.

[2] R. K. Crane, Electromagnetic Wave Propagation Through Rain. New
York, John Wiley &
     Sons, 1996.