To Explore Transmitted Reference Ultra Wide Band Receiver

The object of this paper is Ultra wide band receiver, according to the produce of UWB correlation template, there are two kinds of UWB receiver: Locally Generated Reference receiver and Transmitted Reference receiver. Rake and TR are the representation respectively. This communication mode was responsed by the academe. Ultra wide band uses ns level pulse of signal cycle to transmit information within 10m distance. This communication mode has merits of low cost, Low transmit power, High performance in multipath channels etc. It has broad application scape in many fields.Rake receiver is mostly used during to its good collecting resolvable multipath components and the improvement of receiving performance. Also the channel estimation is difficult completed for high rate sampling. Because of UWB's own characteristic, the design of Rake receiver is more difficult than any other receivers, mainly because the channel eastimation is difficult. The difficult receiver is not suitable for application.Although, UWB system's unique characteristic, such as directly transmitted narrow pulse with unmodulated, makes receiving method different with the former narrow band system. The receiver design and the receiving algorithm become more important, which are the bottle-neck of receiving the signal effectively and accurately. Because of the use of the ns level extremely narrow pulse and the multipath UWB channel, the complexity and sensitivity of UWB receiver are increased in order to resolve the multipath signal. In addition, the serious frequency selectivity of UWB channel and the low transmitted power limits of UWB system is a great design challenge to the receiver.To reduce the complexity of the receivers, Based on the research of the basic transmitted reference (TR) receiver and the differential transmitted reference (DTR) receiver, a modified transmitted reference receiver is proposed with the principle research and the performance analysis. It transmitted some reference signal and some data signal in one bit time. Analyze the processes of sending, transmitting and receiving. And discuss its performance of receiving. Simulate the communicate process. The atheory and simulation indicated that because of the several reference signals were transmitted, its prerformance was better than TR receiver. The complexity is not increased obviously. And the complexity is lower than DTR, but the receiving performance and data speed are nearly the same with DTR.The main contents are sum-up as follows:In chapter one, Based on the historical background and research actuality of UWB, the research significance and the contents of the dissertation are given. In chapter two, the fundamental knowledge of UWB is introduced, including UWB pulse choice, modulation as well as channel model, which is the foundation of the following research.In chapter three, mainly focused on the theory of UWB locally transmited reference receiver. Research the impact caused by the longth of reference templet. In chapter four, discussed the non-reference receiver. The transmited reference receiver and the difference transimited reference receiver were introduced. Mainly focus on the percentage error bit, the length of integral window and the amount of pulse per bit.In chapter five, a modified transmitted reference receiver is proposed, the principle and performance is analyzed in the performance simulation. In addition, the three receiving algorithms are compared in detail.In chapter six, a summary of the dissertation is given. The suggestion for future research related TR receiving algorithms is put forward. At the same time, the dissertation has some groping action to the following questions: how to estimate response of the channel or local equivalent template and the signal effective track. In that way, the next receive equipment of UWB channel model can work integrated.