UWB PPM-TH and PAM-DS system with time reversal and its improved solution.

The ultra-wideband (UWB) wireless technology is a hot point in communication area. Pulse position modulation with time hopping (PPM-TH) and pulse amplitude modulation with direct sequence (PAM-DS) are two of the basic UWB modulation methods. In this paper, we study the performances of the traditional UWB and time reversal (TR) UWB in the PPM-TH and PAM-DS system respectively. We found that the performance of TR PAM-DS is better than TR PPM-TH, and although the system with TR is better than traditional system, the Bit Error Rate (BER) is high when the noise is large. So we improve on TR with one-bit technique which is sacrificing partial temporal focus to increase amplitude. In complex environment one-bit TR is more suitable for PAM-DS system. [ABSTRACT FROM PUBLISHER]