A performance comparison of suboptimal receivers used in IR-UWB communication systems operating within the IEEE 802.15.4a industrial environment.

摘要

In this thesis, the performances of the selective Rake receiver, the transmitted reference (TR) receiver and the differential detection receiver used in impulse radio ultra-wideband (IR-UWB) systems are evaluated and compared through computer simulations. The receivers are compared in terms of bit error rate (BER), system complexity, and implementation considerations. The IR-UWB systems operate in the IEEE 802.15.4a industrial line-of-sight (LOS) and non-line-of-sight (NLOS) environment channels corrupted by additive white Gaussian noise (AWGN).;The advantages and disadvantages of these three types of receivers are presented. The TR receiver and the differential detection receiver, though having lower system complexity, present a worse performance than the selective Rake receiver with multiple fingers, especially in the IEEE 802.15.4a industrial LOS environment. However, The TR receiver and the differential detection receiver are more viable than the selective Rake receiver since the complexity of the selective Rake receiver is very high in the IEEE 802.15.4a industrial NLOS environment. In the IEEE 802.15.4a industrial NLOS environment, the TR receiver has the performance level of a selective Rake receiver with 24 fingers at high signal-to-noise ratio (SNR); the differential detection receiver has a better performance than a selective Rake receiver with 48 fingers at high SNR. However, the differential detection receiver is shown to be much more sensitive to the effect of intersymbol interference (ISI) than the selective Rake receiver due to the "ISI-cross-ISI" effect produced by the correlator. In addition, in both IEEE 802.15.4a industrial LOS and NLOS environments, the BER performance of the TR receiver is about 3 dB worse than the differential detection receiver at the BER of 10-4. Based upon the obtained evaluation results, a series of suggestions are outlined for the future research and development of IR-UWB receivers.