Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Digital Communications and Spread Spectrum System
Digital Communications and Spread Spectrum System
Space-Time Codes and MIMO Systems
Space-Time Codes and MIMO Systems
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Space-time block coding for wireless communications: performance results
IEEE Journal on Selected Areas in Communications
| Hi-index | 0.00 |
Ultra wide-band (UWB) indoor channel is highly time scattered with large number of multi-path and a transmit power of UWB systems is limited to low level. One method to overcome these weak points of UWB communication is diversity combining technique. In this paper, we simulate and analyze performance of pulse position modulation-time hopping (PPM-TH) UWB systems adopting a space time block coding (STBC) scheme in indoor wireless channels. Indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) model proposed as a UWB indoor channel model by the IEEE 802.15.SG3a in July 2003. In the STBC encoding process, an Alamouti algorithm for real-valued signals is employed because UWB signals have the type of real signal constellation. It is assumed that the transmitter has knowledge about channel state information. From simulation results, it is shown that the performance of PPM-TH UWB systems with the STBC scheme is improved due to diversity and array gains. And the system performance can increase although there is multi-user interference.