Performance Analysis of Time-Hopping Pulse Width Modulation for Ultra-Wideband Impulse Radio

摘要

The Ultra Wide-Band (UWB) technology is going to become one of main technologies in short-range highrate wireless communications due to its unique characteristics. This paper presents a new modulation scheme-pulse width modulation (PWM) for UWB communication systems and describes the signal model modulated by this modulation scheme based on the timehopping (TH) multiple access mode. Its bit error rate (BER) performance is analyzed in presence of multipath channel and a comparison is made between TH-PWM and time-hopping pulse position (TH-PPM) systems. BER performances for these two systems are simulated respectively in the four typical dense multipath channel CM1-CM4 recommended by IEEE 802.15.3a. The theoretical and simulation results prove that PWM is a viable modulation scheme with better BER performance for UWB communication systems. Despite the theoretical analysis and simulation are based on the time-hopping multiple access, PWM modulation scheme can also be applied to other multiple access methods of UWB communication system.