Research Of Channel Estimation Technique In Space-time Coding UWB Systems

Since the Ultra Wide Band (UWB) wireless communication has lots of advantages such as high data transfer rate, low power consumption, high positioning accuracy and strong ability of anti-multipath and so on, it has been the subject of extensive research in the short-range wireless communication area. Among them, the space-time code and channel estimation are key technologies in ultra wide band communication systems. This paper presents a space-time block coding based on the TH-PPM ultra wideband system, which uses two transmit antennas and one receive antenna, space-time block coding using Alamouti real-valued constellation map. The transmitting signals are modulated in TH-PPM and encoded by STBC and then send to the indoor wireless channel. The received signals are feed into the STBC decoder and then demodulated by TH-PPM demodulator. It is assumed that the transmitter has the knowledge about channel state information. Simulation results show that the performance of TH-PPM UWB systems with the STBC scheme is improved.