Transmission Reference Uwb Receiver Optimized Design And Anti-jamming Performance

Ultra-wideband (UWB) communication is a novel short-distance wireless communication technique, in which data is transferred with non-sinusoidal pulses with very short duration. UWB has many advantages, such as high transmission rate, low power consumption, good security, immune to multi-paths and low cost. Especially, UWB systems can coexist with the existing wireless communication systems at the same frequency band, that UWB can achieve license free wideband wireless access system. It is attracted for nowadays limited frequency spectrum resource.Ultra-wideband communication transmits information with a train of narrow pulse, and generally receives signals by Rake receiver. Rake receiver need exactly estimate the delay and gain of all multi-paths. But t is very difficult to obtain exact delays and gains for the dense multi-paths environment. Due to the narrow pulse, precise synchronization is needed for the UWB Rake receiver. Thus, the UWB Rake receiver becomes too complex to be implemented. For these reasons, transmitted reference UWB have regained popularity.According to the TR-UWB scheme, a pair of pulses is transmitted where the first pulse is unmodulated and the second is modulated by data. Both pulses are distorted in the same way by the channel since the inter between the pulse pair is very shot. So the first pulse can be used as reference or pilot for the demodulation of the second pulse. The advantages of TR-UWB are simple receiver architecture and synchronization. But the performance of TR-receivers are sensitive to type of channel noise such as additive white Gaussian noise and narrowband interferences Thus, it is an important issues to design the TR-receiver with the ability to mitigate the impact of noise.The main contributions of this paper are as follows:The definition, development and application of UWB and TR-UWB are introduced in the first chapter. The background of our research product about TR-UWB system is also presented. The receiver models about TR-UWB with MMSE weighted receiver, MRC weighted receiver, average receiver and averaged-weighted receiver are proposed. Then, the performances of these receivers are analyzed with the AWGN channel. It shows the simulation results with the Matlab model.The performance analyses of proposed receivers are also performed with the UWB channel.The anti-jamming algorithms for single tone and partial frequency band interference are studied and optimized in this dissertation. The simulation results show that performance of anti-jamming algorithms is sensitive to frequency or phase of the interference signals, and imbalance is also introduced by the correlation processing. A novel anti-jamming algorithm is proposed for the signal imbalance. The simulation results show it is effective.