Research On The Structure And Algorithm Of IR-UWB Secure Communication Receiver

With the development of the modern communication and data transmission technology, the intense need for short range high speed data transmission system can be expected. Impulse Radio Ultra Wideband (IR-UWB) is a competitive candidate because it has a potential high data rate. IR-UWB techniques have recently received a great deal of global attention because of its advantages of low power consumption, low complexity, low cost, high data rate, and low probability of interception / low probability of detection (LPI/LPD).The key problem is how to detect and estimate the IR-UWB signal effectively. IR-UWB signal usually propagates in dense multipath environments, and the energy are spread out. The traditional structure and algorithm of the receiver can not fit the requirement of IR-UWB system. On the other hand, the pulse duration of IR-UWB is very short, usually shorter than 1 nanosecond, so the fast and accurate synchronization scheme is needed in the system. These are the main obstacles of the development and application of IR-UWB.In this paper, multipath channel equalization method, and the structure and algorithm of the IR-UWB receiver in dense multipath indoor channel and the fast synchronization scheme are analyzed in detail. Main contents and innovations are listed as following:1) The formers's works in the region of IR-UWB are reviewed. Basic concepts, realizations and features of IR-UWB are introduced.2) The theory of IR-UWB is studied deeply. The system model and the waveform of the gauss pulse are introduced. The concepts of pseudo-random timing hopping multiaccess and modulation methods are proposed. The structure of transmitter and receiver is analyzed.3) Because IR-UWB system is often used in multipath indoor environment, the channel equalization algorithm is studied. A equivalent linear modeling equalization algorithm and a kind of adaptive equivalent linear modeling equalization based on symbol rate receiving which is easy to realize are proposed. It can improve the system performance. The adaptive algorithm is based on symbol rate receiving, that makes the calculation amount depressed and the system complexity reduced. This is meaningful to realization of the impulse radio system.