Research On The Technology Of Ultra-Wideband Modulation Using Pseudo-Chaotic Code

Along with the development of wireless communication, all kinds of wireless communication systems appeared, the advanceing of WLAN,Ad hoc,WPAN raise the upsurge on the short distance wireless communication. However, the people's demands are increasing, hoping it to provide higher data rate,lower cost and power. And Ultra-WideBand (UWB) can meet these demands. It is becoming the main technique on short distance wireless communication in future. Whatever in America or in Europe, UWB technique gained great attention. The UWB system specially applies in short distance wireless communication because of its characteristics such as lower power,low capture rate and anti-multi-path decline ability.It is these years that UWB aroused the people's attention, one of the research directions relating to the modulation. Different modulations give great effect to system transmission rate, anti-multi-path ability. To draw comparison of them will have certain reference meaning to the system's modulation design. In addition, the improving on data rate of the systems is also our hanker goal.The discovery of chaotic dynamic system broad the way of study of PN sequence. Chaos is a convinced and random kind course that appears in the nonlinear system. It is an unperiod and an irregular course. It is not convergence but dose have a bound, while it is sensitive to its initial value. For all these special performance, chaos has a excellent outlook in the application of telecommunication, especially in the generation of PN sequence.This paper carries through correlative introduction and research on UWB system. The main researches and results are the following:1,Starting with the rationale of UWB, analyzed the technique characteristics of the system, known about its abroad applications fields, traversed the common modulation of UWB.2,Analyzed the choice of the waveform,the build of the signal and the waveform using the general modulation.3,Discussed on the changing complexion of the signal power spectrum and the influence of time hopping (TH) code, after combining the TH code with PPM.4,Reserached the generation of pseudo-chaotic (PC) code based on the Tent map, comparing the performance of the PC code with the PN code, also studing the Bit Error Ratio after adopting the PC code.