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This paper evaluates the performance of variable-step closed loop power control algorithm for CDMA communication employing High Altitude Platforms (HAPs). In HAPs, the channel is predicted to have different characteristics compared to that in terrestrial. Users that are distributed within HAPs coverage will have different channel characteristics depending on their elevation angle. In this work, HAPs channel is modeled to follow Ricean fading distribution which K-factor is obtained based on experimental measurements. The variable-step power control algorithm is then computer simulated under such a channel to evaluate its performance.
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