Subject: 回复： [manet] Radio Propagation model difference between Sensor networks and Bluetooth

From: Longjiang Li <[email-masked]>
Date: Thu, 25 Jan 2007 15:45:52 +0800 (CST)

Hello,

I do not think that the radio propagation model difference  between Wireless Sensor Networks and Bluetooth can be derived in general, since it relies on the deployment scenarios indeed. In fact, it seems that there is no standard on radio propagation model, since radio propagation models are mainly used for the implementation of network simulations.

To the best of my knowledge, the most commonly used radio propagation models include free space model, two-ray model and log-normal model. 
The free space propagation model assumes the ideal propagation condition, i.e., a perfect circular coverage area around each node. The two-ray model considers both the direct
path and a ground reflection path, but it usually does not function well when  distance between nodes is small, and thus is more suitable for long-distance radio networks. In contrast,  the log-normal model, more practical, allows for random signal power variations,  i.e.,  the radio coverage area may deviate dramatically from a perfect circular shape, but it is a bit more complex. 

In conclusion, the log-normal model is the most general and widely-used model, but the free space model is also useful due to its simplicity. Thus, you are advised to choose a right model based on the deployment scenario you are to use.

Hope this helps. 

Best regards,
Longjiang Li

----- 原始邮件 ----
发件人： Chris Yao <[email-masked]>
收件人： [email-masked]
已发送： 2007/1/22(周一), 下午12:05:31
主题： [manet] Radio Propagation model difference between Sensor networks and Bluetooth

hi,
   
  I would like to know the radio propagation model difference between Wireless Sensor Networks and Bluetooth? Could someone show me related standard and papers?
   
  Thanks,
   
  Chris

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