In practical Ultra-Wideband (UWB) systems, Rake receivers are not able to fully take advantage of all resolvable paths, because of the required computational and power resources. On the other hand, Transmitted Reference (TR) schemes are simple, robust structures with low power consumption and they do not require channel estimation, but they sustain a 3dB energy/rate loss, as each symbol require...

A new receiver concept with interference cancellation for the UTRA downlink is presented and compared in terms of the bit-error rate (BER) with single-antenna and multiple-antenna conventional receivers. Since the proposed scheme is equipped with the knowledge of the conventional receiver, i.e. the code of the signal of interest and the number of relevant transmission paths arising from multipa...

In this paper, we propose a new compact quasi-fractal shaped microstrip antenna that consists of a hexagonal patch as the main radiator and a complementary stacked patch as the parasitic element. The overall surface of the proposed quasi-fractal patch is about 55% lower than the conventional hexagonal patch. Using of stacked technique, the gain reduction of compression technique is almost compe...

This paper proposes high-rate full-diversity spacefrequency trellis code (SFTC) designs, which achieve the full diversity advantage at high transmission rate, for frequency selective fading channels. The proposed SFTC are derived based on the concept of concatenated space-time block code (STBC) and multiple trellis coded modulation (MTCM) encoder constructions. The existing SFTC designs only pr...

Low Gain Avalanche Diodes (LGADs) is one of the candidate sensing technologies for future 4D-tracking applications and recently have been qualified to be used in ATLAS CMS timing detectors CERN High Luminosity Large Hadron Collider upgrade. LGADs can achieve an excellent performance by presence internal gain that improves signal-to-noise ratio leading a better time resolution. These are designe...

We propose differential space time block codes (STBC) using nonconstant modulus constellations, e.g., quadrature amplitude modulation (QAM), which cannot be utilized in the conventional differential STBC. Since QAM constellations have a larger minimum distance compared with the phase shift keying (PSK), the proposed method has the advantage of signal-to-noise ratio (SNR) gain compared with conv...

A complete procedure for the design of W-band low noise amplifier in MMIC technology is presented. The design is based on a simultaneously power and noise matched technique. For implementing the method, scalable bilateral transistor model parameters should be first extracted. The model is also used for transmission line utilized in the amplifier circuit. In the presented method, input/output ma...

Some useful features of microstrip patch antennas are low profile, low weight and easy fabrication. However this type of antenna suffers from having a low gain, caused by propagation surface waves. In this paper, a new near zero refractive index metamaterial (MTM) unit cell is designed and fabricated as a superstrate over a Rectangular Microstrip Patch Antennas (RMPA). In order to obtain a maxi...

SUMMARY This study investigates a band extension technique for narrow-band telephony speech. The proposed technique employs full wave rectification that nonlinearly generates high-band overtones from the low band. In order to improve the conventional technique, this study investigates a frame-by-frame gain control based on the estimation of gain parameter from narrow-band telephony speech. A su...