A linear receiver for direct-sequence spreadspectrum multiple-access communication systems under the aperiodic random sequence model is considered. The receiver consists of the conventional matched filter followed by a tapped delay line with the provision of incorporating the use of antenna arrays. It has the ability of suppressing multipleaccess interference (MAI) and narrowband interference i...

Sparse multipath channels are wireless links commonly found in communication systems such asterrestrial broadcasting, underwater acoustic and cellular land mobile. Their impulse responses arecharacterized by a few significant multipath terms that are widely separated in time. With highspeed transmission, the length of a sampled sparse channel can reach hundreds of symbol intervals,<...

Single-mode optical fiber is an attractive delay medium for processing microwave frequency signals due to its extremely low loss ( <0.1 dB/ps) and large available time-bandwidth product (in excess of 105 ). Recent progress in the efficient tapping of light from single-mode fibers has made it possible to construct recirculating and nonrecirculating (tapped) delay-line structures that can perform...

A UWB impulse array antenna (IAA) utilizing a novel electrical scanning system with tapped delay lines is proposed and its usefulness is experimentally verified. The experimental antenna is composed of impulse generators installed in each antenna element and tapped delay lines used for creating transmitting trigger signals, which is a simple circuit configuration. It is shown that the output ph...