Uwb Communication Frequency Domain Received

Ultra-wideband (UWB) communication is a novel short-distance wireless communication technique, in which data are transmitted using non-sinusoidal pulses with very short duration. It has many advantages, such as high data rate, good security, robustness to multipath and fine location ability. Especially, it does not require extra frequency spectrum, and can coexist with the existing wireless communication systems at the same frequency band, which make it attract much attention nowadays when the frequency spectrum resource has become more and more precious. However, there are some problems must be solved before it is matured, one of which is the receiver design.Using nanosecond duration pulses to transmit data leads to a high demand on analog-to-digital converters, which is a significant challenge to receiver design. This paper presents a frequency-domain receiving technique to deal with high-sampling requirement of an impulse-radio ultra-wideband (IR-UWB) communication system. In this paper, we propose a frequency-domain sampling technique based on the spectral characteristics of impulse-radio UWB signals to extract the frequency components of the received signals to perform signal processing in the frequency domain. The proposed frequency-domain approach relaxes the speed requirement for ADCs and makes digitizing the IR-UWB receiver possible. This paper also proposes the approaches of frequency-domain frame synchronization, frequency-domain channel estimation and frequency-domain demodulation. And model the frequency-domain receiver architecture of an IR-UWB system. Then, the performance of the frequency-domain receiver of IR-UWB system in the UWB indoor multipath channel is analyzed and through simulations.This paper also focuses on the frequency-domain receiving technique in a transmitted-reference ultra-wideband (TR-UWB) system to overcome the shortcomings of analog delay lines which are required in analog implementations of the conventional TR-UWB auto-correlation receiver. The proposed frequency-domain receiver is also based on frequency-sampling with filter banks. The main advantages of the proposed frequency-domain receiver are the relaxation of the conversion speed of the ADC and simplicity of all-digital receiver architecture. The performance of TR-UWB frequency-domain receivers is analyzed both theoretically and through simulations. And the simulation result shows that the TR-UWB frequency-domain receiver has a much better performance compared with the conventional TR-UWB receiver.