Attractive features of time-hopping spread-spectrum multiple-access systems employing impulse signal technology are outlined, and emerging design issues are described. Performance of such communications systems in terms of achievable transmission rate and multiple-access capability are estimated for both analog and digital data modulation formats under ideal multiple-access channel conditions.

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in controlled and non-controlled environments. This allows the use of SNAs and in-situ measurements. Although the linear phase component cannot be retrieved, important factors for UWB receiver design such as the group delay ripple and time dispersion effect can be extracted. In many potential application problems, the measured phase data may have been degraded by measurement and quantization noises. We have shown that phase retrieval could be superior to direct phase measurements for signals propagating through noisy channels. When VNA measurement is conducted, estimation of linear phase component can be achieved through matching the measured phase with retrieved phase. ACKNOWLEDGMENTSThis work was supported by King Fahd University of Petroleum and Minerals. The author would like to thank Prof. A. Safaai-Jazi and Prof. M. Abuelma'atti for their constructive ideas and fruitful discussions. A CLASS-E CMOS RF POWER AMPLIFIER WITH CASCADED CLASS-D DRIVER AMPLIFIER