[ns] Propagation models

[Leonard Miller <lmiller@antd.nist.gov>]

Model for propagation loss used in study of Bluetooth operation in an
802.11 environment: section 3 of the following document:

http://www.wirelessethernet.org/downloads/BT_inf802_June_8.pdf

This model uses free space for distances less than 8m and 58.3 + 33
log10(r/8) in dB for distances greater than 8m.  The curve is piecewise
continuous for the particular frequency 2.45 GHz (wavelength of
0.1224m).

Another approach is given in the appendix of the online document at

http://www.zeuswireless.com/html/about/wirelessconn.html

The propagation loss is "50dB for the first 20 feet and 30 dB for each
additional 100 feet"


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Leonard E. Miller, Wireless Commun. Technologies Group
    National Institute of Standards & Technology (NIST)
    100 Bureau Drive Stop 8920, Bldg. 820, Room 445
    Gaithersburg, Maryland 20899-8920
Phone: 301-975-8018        Fax: 301-590-0932
email: lmiller@antd.nist.gov, Len_Miller@compuserve.com
http://w3.antd.nist.gov/wctg/