Title :
A low power architecture for wireless multimedia systems: lessons learned from building a power hog
Author :
Mangione-Smith, William ; Ghang, Phil Seong ; Nazareth, Sean ; Lettieri, Paul ; Boring, Walt ; Jain, Rajeev
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
UCLA has constructed a network testbed which serves as an environment for developing wireless multimedia systems. The first generation testbed consists of a set of battery powered terminals with low-bit rate video codecs connected to a peer-to-peer multi-hop network over spread spectrum radios. Not surprisingly, this set of features draws considerable current during operation, and achieves a battery life of approximately one hour using a 24 Wh NiMH battery. This report discusses the power consumption of the existing testbed, lessons learned during its development, and a course of action directed to improving battery life for a portable multimedia terminal. The key advancement is the development of a complete system architecture focused on turning off power to components and subsystems. Starting with communications protocols, and progressing up through processors to APIs, this new design extends useful battery life through a significant reduction in current drain
Keywords :
carrier sense multiple access; frequency hop communication; multimedia communication; spread spectrum communication; telecommunication network routing; video codecs; 1 hour; 24 Wh; APIs; CSMA/CA channel; NiMH battery; TCP-IP networking; battery life; battery powered terminals; communications protocols; complete system architecture; current drain reduction; low power architecture; low power components; low-bit rate video codecs; medium access control protocol; network control processor; network testbed; peer-to-peer multi-hop network; portable multimedia terminal; power consumption; power hog; spread spectrum radios; wireless multimedia systems; Batteries; Energy consumption; Life testing; Multimedia systems; Peer to peer computing; Power generation; Spread spectrum communication; System testing; Turning; Video codecs;
Conference_Titel :
Low Power Electronics and Design, 1996., International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-3571-6
DOI :
10.1109/LPE.1996.542725
