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Low-Power Wireless Video System

Low-Power Wireless Video System. Advisor: Professor Alex Doboli Students: Christian Austin Artur Kasperek Edward Safo . Objective. Establish a low-power wireless client/server streaming video system. Use MPEG-4 video standard.

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Low-Power Wireless Video System

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  1. Low-Power Wireless Video System Advisor: Professor Alex Doboli Students: Christian Austin Artur Kasperek Edward Safo

  2. Objective • Establish a low-power wireless client/server streaming video system. • Use MPEG-4 video standard. • Hardware software co-design for low-power video decoder implementation.

  3. What is MPEG-4 and Why Use It? • What is MPEG-4? • Object based video compression and decoding standard. • Builds on previous MPEG and H.263 standards. • Why use MPEG-4? • High compression makes streaming over low bandwidth network practical (e.g. wireless). • Adjustable resolution coding allows for video continuity/quality trade off. • High bit-rate yields better quality video at the expense of lost frames…

  4. MPEG-4 Framework

  5. Hardware/Software Co-Design • Design methodology that splits a computer system’s design between hardware and software in an effort to improve some feature of the system. • Partitioning targets low power consumption in this design. • Achieved by relocating the functionality of high power sections of code to specialized hardware.

  6. Power Intensive Software • Locating code. • Hardware power profiling. • Software profiling (e.g. GPROF, VS). • Power estimation software (e.g. SimplePower). • Inverse Discrete Cosine Transform (IDCT). • Computational intensive. • High frequency of memory accesses. IDCT

  7. Hardware Implementation • Determine functional units needed to implement the IDCT. • Multipliers and adders. • Map functional units into hardware to realize the IDCT. • VHDL description of functional units, Xilinx FPGA based PCI board. • Hardware Power measurements. • Optimize Hardware for low power. • Add power control logic. • Restructure combinational logic to reduce glitching. • Increase pipelining.

  8. Goals and Applications • Demonstrate that a low-power wireless video system is practical. • Design for a power constrained, low bandwidth PDA. • Applications: • Interactive shopping. • Request video of product information while shopping. • Multimedia preview. • Preview movie before buying or renting; watch music video while previewing new album.

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