Análise de técnicas de detecção de sinais UWB em ambientes PLC

Abstract

Ultra wideband modulation (UWB) has been a subject of research in the wireless field for nearly 20 years and the good results achieved have led to the introduction of new technologies in the market of short distances data communication. However, the employment of UWB for data transmission over power lines (PLC) is still an open, interesting and promising research theme for a specific set of applications which require high throughput over short distances and low cost, such as printers, computer monitors, etc. In this context, this dissertation examines several aspects of the UWB transmission through electricity distribution cables. An UWB impulsive system is analyzed when i) the PLC channel is outdoor, linear and time invariant; ii) the PLC channel is indoor, linear and time invariant; iii) there is AWGN (additive white gaussian noise) and iv) there is AIGN (additive impulsive gaussian noise) noise. Moreover, many questions regarding the adequacy of UWB pulse for the communication channel are answered, taking into account its spectrum when the PLC channel is outdoor or indoor. The UWB modulations investigated are pulse position modulation (PPM) and pulse amplitude modulation (PAM). Apart from presenting some guidelines to project a UWB system, this work analyzes different strategies and techniques for reception that reduce the computational complexity of the UWB receiver. The results point out that UWB is interesting for some specific applications which require high data transmission rate in short distances and low cost.