tailieunhanh - Báo cáo hóa học: " A Complementary Code-CDMA-Based MAC Protocol for UWB WPAN System"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Complementary Code-CDMA-Based MAC Protocol for UWB WPAN System | EURASIP Journal on Wireless Communications and Networking 2005 2 249-259 2005 Hindawi Publishing Corporation A Complementary Code-CDMA-Based MAC Protocol for UWB WPAN System Jiang Zhu Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada T2N1N4 Email jiazhu@ucalgary. ca School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China Abraham O. Fapojuwo Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada T2N1N4 Email fapojuwo@ Received 26 October 2004 Revised 24 January 2005 Recommended for Publication by David I. Laurenson We propose a new multiple access control MAC protocol based on complementary code-code division multiple access CC-CDMA technology to resolve collisions among access-request packets in an ultra-wideband wireless personal area network UWB WPAN system. We design a new access-request packet to gain higher bandwidth utilization and ease the requirement on system timing. The new MAC protocol is energy efficient and fully utilizes the specific features of a UWB WPAN system thus the issue of complexity caused by the adoption of CDMA technology is resolved. The performance is analyzed with the consideration of signal detection error. Analytical and simulation results show that the proposed CC-CDMA-based MAC protocol exhibits higher throughput and lower average packet delay than those displayed by carrier sense multiple access with collision avoidance CSMA CA protocol. Keywords and phrases UWB MAC CC-CDMA WPAN. 1. INTRODUCTION Ultra-wideband UWB is the radio technology that can use very narrow impulse-based waveforms to exchange data. The Federal Communications Commission FCC requires the impulse waveforms to occupy minimum of 500 MHz of spectrum or a band of spectrum that is broader than 1 4 of the band s center frequency 1 . UWB can provide much higher spatial capacity bits s m2 than any other technology and the .