add wireless sim model (b)

without many details.
A simple but complete mobile wireless network simulator in Matlab

Radio propagation: free space, two-ray, and lognormal shadowing
Mobility: random waypoint model
PHY: SNR-based packet capture, broadcast, dynamic transmission rate and
power
MAC: IEEE 802.11 (CSMA/CA, virtual carrier sense, and RTS-CTS-DATA-ACK)
NET: ad hoc routing
APP: overlay routing protocols
Merge branch 'dev-wireless'