Smart Phone and Next Generation Mobile Computing

Supporting Wireless Technologies 145

propagation of signals by which more data can be sent in a single

channel by splitting and recombining data onto multiple paths.

•

Orthogonal frequency-division multiplexing (OFDM), multiple-

carrier-code-division multiple access (MC-CDMA), modulation,

and multiplexing technologies will improve the robustness of

signal transmission and the data rate.

•

Software radio or software-defined radio will make it possi-

ble to reconfigure channel modulation and multiplexing on

the fly.

In a broader vision, 3G cellular systems are merely one type of

wireless access in the world of mobile computing. Other wireless

access technologies, such as wireless LANs and WiMax, have demon-

strated great potential to become a primary means