Multipath Interference Suppression Research For Ultra-wide Band Systems

Ultra-wide band (UWB) technology is the forefront technology of mobile communication technology, which is considered revolutionary advances in radio technology. Compared to narrow band communication systems, UWB technology has the characteristics such as simple, high-speed, low power consumption, low cost, safe, accurate positioning which makes it widely used in actual production and life and become a theoretical research with a very high value.The current ultra-wide band wireless communication system has problems such as ineffective and complex for multipath interference suppression. To solve the problem, the paper first summarizes all parts of the UWB system, gives the implementations of UWB wireless communication system; Make a complete analysis of UWB Rake receiver performance in different channel conditions, different methods and different branch numbers; To solve the problem that the Rake receiver can't transmit quickly, a template-based improvements of Rake receiver is proposed; To enhance the inhibitory effect of multi-path interference as well as reduce system complexity, a new Pre-Rake receiver scheme is proposed, which has a good suppression effect and with simple system.Rake receiver can not meet the high-speed transmission, and increase the number of receiving fork can reduce the bit error rate and improve the performance of multipath interference suppression. However, the increase of receiving fork will increase the complexity of the system. The paper fisrt propose a new template-adaptive Rake receiver to improve high-speed transmission capacity. For the realization of the capabilities of suppression and reducing the complexity of the system, a new Pre-Rake receiver is designed and the merging process is transferred to the sending side. Rake receives a set sum of multipath signals, each signal is multiplied by a weighted factor and merge to form the final signal. This operation is equivalent to do a backlash response to transmitting signals, that is, while the intensity and phase relationship of the channel impulse response is given, the above merging process can be equivalently implemented on the transmitter side. This approach automatically combines the signals through the channel, and only to receive the strongest signal path at the receiving end.