Effects of shadowing on the number of active users in random multi-user channels

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• 作者：Jalil Etminan ; Hengameh Keshavarz ; Ravi R. Mazumdar
• 关键词：Wireless ; Multi ; user ; Broadcast channels ; Multiple access ; Shadowing ; Scaling
• 刊名：Wireless Networks
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：22
• 期：8
• 页码：2501-2509
• 全文大小：716 KB
• 刊物类别：Computer Science
• 刊物主题：Computer Communication Networks
  Electronic and Computer Engineering
  Business Information Systems
  
• 出版者：Springer Netherlands
• ISSN：1572-8196
• 卷排序：22

文摘

Prior work has addressed the effects of multipath fading and path loss separately for broadcast and multiple-access channels. It has been shown that the number of simultaneously active users are of the order \(\Theta (\ln (\ln (n)))\) for random channel gains with exponentially-decaying tails, where n is the total number of users. Furthermore, it has been shown that assuming path loss is dominant and ignoring multipath fading, the user capacity (i.e. the maximum number of simultaneously active users in a wireless system) of multi-user channels is of the order \(\Theta (\ln (n))\) when the users are spatially distributed on the plane with a Gaussian or Uniform distribution. In this paper, we study the shadowing effects on the number of active users for broadcast and multiple-access channels in which the users are randomly distributed on the plane. It is shown that as the total number of users in the multi-user channel goes to infinity, the number of active users is of the order \(\Theta (\sqrt{\ln (n)}).\)