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Dynamic Data Compression for Wireless Transmission over a Fading Channel 1 Compression 2 N S t Channel State CISS 2008 Michael J Neely University of Southern California Sponsored in part by the DARPA IT MANET Program NSF OCE 0520324 NSF Career CCF 0747525 1 Compression 2 N S t Channel State Random Packet Arrivals A t Stochastic Channel S t Data must be Compressed Stored and Transmitted Both Compression and Transmission expend power signal processing consumes power Goal Minimize Total Average Power Expenditure Ptot Pcomp Ptran Compression Operation 1 2 A t K t N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed packets size B bits A t 0 1 N K t Compression Decision Option at time t K t 0 1 K A t K t Compression Function Random bit size output after compression Compression Operation 1 2 A t K t N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed packets size B bits A t 0 1 N K t Compression Decision Option at time t K t 0 1 K A t K t Compression Function Example A t 2 K t k A t K t Pcomp t random output random output Compression Operation 1 2 A t K t N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed packets size B bits A t 0 1 N K t Compression Decision Option at time t K t 0 1 K A t K t Compression Function Example A t 2 K t k A t K t Pcomp t random output random output Compression Operation 1 2 A t K t N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed packets size B bits A t 0 1 N K t Compression Decision Option at time t K t 0 1 K A t K t Compression Function Example A t 2 K t k A t K t Pcomp t random output random output Compression Operation 1 2 A t K t N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed packets size B bits A t 0 1 N K t Compression Decision Option at time t K t 0 1 K A t K t Compression Function Example A t 2 K t k A t K t Pcomp t random output random output Compression Operation 1 2 A t K t 1 1 N Timeslotted System t 0 1 2 3 A t packet arrivals at time t fixed



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