A VLSI Architecture for the Node of Wireless Image Sensor Network  

作　　者：ZHOU Renyan LIU Leibo YIN Shouyi LUO Ao CHEN Xinkai WEI Shaojun 

机构地区：[1]Tsinghua National Laboratory for Information Science and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, China [2]Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Journal of Electronics》2011年第4期590-596,共7页电子学报（英文版）

基　　金：This work is supported by the National S＆T Major Project （No.2009ZX03006- 004）, Special Scientific Research Funds for Commonweal Section （No.200903010） and the National Natural Science Foundation of China （No.60803018）.

摘　　要：This paper proposes a novel design of VLSI architecture for the node of wireless image sensor network. This architecture aims at the SoC （System on a chip） im- plementation and is composed of a general purpose em- bedded processor and several dedicated hardware accel- erators for image processing and wireless communication. The hardware implemented Image processing unit （IPU） adopts an innovative image processing approach which concludes Bayer Color filter array （CFA） pre-processing and lossless JPEG compressing. The IPU can process 5 frames/s （VGA full color resolution） under a 16 MHz system clock, reaching a 2.6~4.7 bits/pixel compression rate with the PSNR larger than 46.3dB. The hardware implemented Wireless communication unit （WCU） exe- cutes computing intensive and timing critical tasks of the IEEE 802.15.4 Media access control （MAC） layer, which can achieve high performance and low power consumption on wireless operations compared of software implementa- tion. Furthermore, low power design and techniques are employed to extend battery life, resulting in 45mW maxi- mum system power consumption when the system is in the full working mode （i.e. processor, IPU and WCU are ac- tive simultaneously）. The proposed architecture has been proto-typed on an FPGA system and fabricated in 0.18μm CMOS process.

关 键 词：Wireless image sensor network Lossless JPEG IEEE 802.15.4 MAC. 

分 类 号：TN919.81[电子电信—通信与信息系统] TP212[电子电信—信息与通信工程]