Research On Energy Collection And Acquisition Of IR-UWB Signals

In recent years, with the development of Internet, multimedia and wirless communication, it exists great demands for higher rate and quality multimedia wireless communication. Ultra-Wide Bandwidth (UWB) is becoming one of the most competitive candidates for its security, low power consumption, excellent performance in anti-multipath ability and multiple access capacity, easier for multifunction integration, low complexity and cost, etc.The wireless business has extented itself to high-rate, high-capacity speech and data transmission in a variety of environment such as office building, business building, supermarket, townhouse, gymnasium, etc. The environment for UWB indoor wireless communication is much more complicated than that of outdoor and traditional narrowband and broadband communication based on continuous wave (CW), which is embodied on the large multipath excess of the channel impulse response. The characteristics of the channel bring great difficult to the receiver design. We research two most basic problems of the receiver design combined with the the characteristic of indoor wireless channel, that is energy collect and acquisition of the UWB system. The goal is to resolve how to collect and use energy (multipath signal energy after antenna) efficiently and how to complete the signal acquisition efficiently, and then found the theoretical analysis framework of the energy collection and acquisition of UWB system in the multipath model, so we can objectively evaluate the performance of energy collection and acquisition in the UWB channel. The contents we research include:Firstly, we introduce the modulation manner. Different from the conventional wireless communication, IR-UWB system employs narrow pulse scheme which does't need carrier modulation, thus phase locked loop (PLL) can be droped at the end of the receiver, which will result in low implementation complexity and low cost. The received signal is composed of the convolution of the modulation narrow pulse and the impulse response of the channel, the multiple-access interference, the narrowband interference and additive white Gaussian noise. For the purpose of the analysis convenience of the following chapters, we briefly...