The detection sensitivity (DS) of the commercial single-photon-receiver based on InGaAs gate-mode avalanche photodiode is estimated. Instalment of a digitalblanking-system (DBS) to reduce dark current makes the difference betweenDS, which is an efficiency of the detector during its open-gate/active state, and the total/overall detection efficiency (DE). By numerical simulations, it is found tha...

Detection statistics for a coherent laser radar are substantially different from those of a direct detection laser radar. Direct detection ladar detection statistics vary depending upon the detection mode (i.e., photon-counting vs. continuous direct detection). Speckle noise also impacts the detection statistics. For a single-pixel single-frequency single-polarization coherent detection transce...

Multiple input multiple output (MIMO) systems provide dramatic capacity gain through an increased spatial dimension. However, the capacity gain is reduced if the channel state information (CSI) is not perfectly known. Thus, to improve MIMO system performance, CSI at the transmitter (CSIT) and receiver (CSIR) should be used efficiently. Uncertainties in CSI arise mainly due to imperfect channel ...

A major error component of Global Positioning System (GPS) is the ionospheric delay. Ionopspheric error can be reduced by a dual frequency receiver using a linear combination technique that can not be applied with a single frequecy receiver. However, an accurate ionospheric error modeling for single-frequency receiver is required. Due to the nonlinearity of the ionospheric error, a highly nonli...

Observations of Interplanetary Scintillation (IPS) are an efficient remote-sensing method to study the solar wind and inner heliosphere. From 2016 2018, some distinctive observations IPS sources like 3C 286 279 were accomplished with Five-hundred-meter Aperture Spherical radio Telescope (FAST), largest single-dish telescope in world. Due 270-1620 MHz wide frequency coverage Ultra-Wideband (UWB)...

ABSTRACT In this study, we report on a detailed single pulse analysis of the radio emission from pulsar J1401 − 6357 (B1358 63) based data observed with ultrawideband low-frequency receiver Parkes telescope. addition to weak leading component, integrated profile features single-humped structure slight asymmetry. The frequency evolution is studied. Well-defined nulls, an estimated nulling fracti...

In this paper, we propose a new differential multiple-input multiple-output (MIMO) single-carrier system with frequency-domain equalization (SC-FDE) aided by the insertion of cyclic prefix. This block transmission system not only inherits all the merits of the single-input single-output (SISO) SC-FDE system, but is also equipped with a differential space-time block coding (DSTBC) such as to com...

The Electron Cyclotron Emission (ECE) diagnostic system in ITER provides essential information for plasma control and for evaluating the plasma performance. It measures the electron temperature profile (edge/core), electron temperature fluctuations and radiated power in the electron cyclotron frequency range from the plasma. Virginia Diodes Inc. (VDI) has designed and developed a stateof-the-ar...

Orthogonal frequency division multiplexing (OFDM) has emerged as a modulation scheme that can achieve high data rates over frequency selective fading channel by efficiently handling multipath effects. This paper proposes receiver design for spacetime block coded MIMO OFDM transmission over frequency selective time-variant channels. Joint channel and data recovery are performed at the receiver b...