Study Of Ultra-wideband Wireless Communication System Receiver

Ultra-wideband (UWB) technique is a new wireless communication technique. Compared with traditional narrowband communication, it has many advantages, such as low cost, low power consumption, high transmission rate, good multipath resolution capability, so it has fine prospect in commercial, household and personal multimedia network, which makes it attract extensive attention home and abroad. IEEE proposes ultra-wideband as the realizing scheme of physical layer in wireless personal area network.In the first chapter, the fundamental concepts, including the history, definition, characteristics, research status and some key techniques of UWB communication are briefly introduced. In chapter 2, some significant techniques of UWB communication are analyzed in detail, such as modulation, coding, multiple access, shaping of pulse, and channel model. Especially, the channel model proposed by IEEE 802.15.3a is analyzed thoroughly in this chapter.Due to the extremely narrow character of UWB signal, dense multipath indoor channel will make UWB signal dispersed severely. The multipath fading channel will probably bring intersymbol interference (ISI), and then restrain the performance of communication system. When the data rate is low, ISI is insignificant, even be ignored, but as the data rate is increased, ISI is more and more severe. Especially in non-line-of-sight(NLOS) environment, the interference effect is outstanding.Corresponding to the above-mentioned question, in the chapter 3, the performance of several common used RAKE receivers in UWB communication systems is researched based on the channel model proposed by IEEE 802.15.3a. By theoretical analysis and computer simulation, the advantages and disadvantages of common used RAKE receiver with different combining methods is analyzed. From the aspect of realization complexity and bit error rate (BER), we find an optimum RAKE receiver scheme, which has an...