Research On Transmitted Reference Ultra-wideband Receivers

Ultra-Wideband (UWB) is being more and more concerned and becoming one of the key technologies for next generation short-range wireless communication since character of low-power, high-speed and low-cost. As the most important component of UWB system, ultra-wideband receiver, which can effectively receive and demodulate signals, is a key and difficult problem in the implement of ultra-wideband communication system. When to design the receiver, it not only need us to foucs on its good performance, but also requires a simple structure to reduce cost.In this paper, we conduct a detailed analysis of ultra-wideband receiver model. Traditionally, Rake receiver is used to capture signal energy as much as possible in order to improve reception performance. However, sampling rate, synchronization accuracy as well as channel estimation make Rake receiver hard to realize. To reduce the receiver complexity, this paper studies Transmitted Reference Ultra-Wideband (TR-UWB) receiver.First of all, based on the traditional TR-UWB receiver, we analysis the theory and structure of three kinds of improved transmitted reference ultra-wideband receivers, which are Average Transmitted Reference Ultra-wideband(ATR-UWB) Receiver, Block-Pulse Transmitted Reference Ultra-wideband(BTR-UWB) Receiver and Differential Transmitted Reference Ultra-wideband(DTR-UWB) Receiver. We also deduce the bit error rate and compare their performance by simulation. In the paper, an evaluation is made from the bit error rate, data transmission efficiency and system complexity of the four kinds of TR-UWB Receivers.Secondly, as to the digital receiver, given the existing theoretical basis, this paper studies the transmission from frequency-domain which can overcome shortcomings of time-domain digital receiver. Then we present a suitable frequency domain all-digital method for TR-UWB receiver. This method effectively reduces the ADC's sampling rate, making ultra-wideband digital receiver easily to implement. Finally, this paper deduces bit error rate performance of the frequency-domain TR-UWB receiver theoretically and compares with conventional TR-UWB receiver by simulation under MATLAB. We obtain that this method has a major promotion on performance than the original receivers.