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Presenter: Hao Zhang, ECE Dept.
Supervisor:

Date: Thu, June 19, 2003
Time: 10:00:00 - 11:00:00
Place: EOW 430

ABSTRACT

Abstract:

With classified military application only until Feb 14, 2002, Ultra-Wideband Radio (UWB) is finally adopted by the Federal Communication Commission (FCC) for commercial use with restricted power constraints, FCC part 15 rules. UWB technology holds great promise for a vast array of new applications that have the potential to provide significant benefits for public safety, businesses and consumers in a variety of applications such as radar imaging of objects buried under the ground or behind walls and short-range, high-speed data transmissions. An Ultra-Wideband (UWB) communication system transmits information using ultra-short impulses which spread the energy of the signal typically from near DC to several GHz. Unlike conventional communication systems, UWB systems operate at baseband, and thus involve no intermediate frequency and no carrier synchronization. UWB theoretically promises a very high data rate by employing a large signal bandwidth. As in communication, Ultrawideband (UWB) radio has emerged as a new threat to the 3G UMTS networks, WLAN, Bluetooth. UWB uses a wide swath of spectrum to transmit low-powered, ultra-short radio pulses through the air, and is capable of transmitting data at several hundred Mbit/s typically over short distances under restricted power limitation. With appropriate technical standards, UWB devices can operate using spectrum occupied by existing radio services without causing interference, thereby permitting scarce spectrum resources to be used more efficiently. Typically pulse amplitude modulation (PAM), pulse position modulation (PPM) or On/Off Keying (OOK) modulation is employed for UWB system. In this seminar, we will propose a new modulation scheme, called pulse position amplitude modulation (PPAM), which combines PPM and PAM constellations to provide better performance with less complexity. Capacity and performance analysis of the proposed Time-Hopping PPAM UWB system will be presented.

Free and open to the public