wireless histry
AM = (amplitude modulation)1906
SW =(shortwave) Radio 1921
FM = (Frequency Modulation) 1931
GSM= Groupe special Mobile 1982
wifi(Wireless Fidelity) = 1997
Wi-Fi uses both single carrier direct-sequence spread spectrum radio technology
(Part of the larger family of spread spectrum systems) and multi-carrier
OFDM (Orthogonal Frequency Division Multiplexing) radio technology.
The regulations for unlicensed spread spectrum enabled the
Development of Wi-Fi, its onetime competitor HomeRF, Bluetooth,
And many other products such as some types of cordless telephones
Half-size ISA 2.4 GHz Wave LAN card by AT&T
A Wi-Fi antenna
A roof mounted Wi-Fi antenna
Advantages and challenges [edit] Operational advantages
A keychain size Wi-Fi detector.
Bluetooth =1998
Bluetooth 1.0 =1999
UMTS = 2002
EDGE = 2003
Bluetooth2.0=2004
wifi new technology = 2009
And Informations By
GLOBAL SYSTEMS & NETCAFE
gitsnet@live.com
