We investigate a reconfigurable intelligent surface (RIS)-aided multi-user massive multiple-input multi-output (MIMO) system where low-resolution digital-analog converters (DACs) are configured at the base station (BS) in order to reduce cost and power consumption. An approximate analytical expression for downlink achievable rate is derived based on maximum ratio transmission (MRT) additive qua...

1. ABSTRACT Performance requirements for broadband modems continue to push the limits of analog technology. Fortunately, today’s digital–to-analog converters (DACs) are approaching sampling rates in the gigahertz range. These DACs allow broadband modems to implement multichannel solutions completely in the digital domain. To fully utilize the available bandwidth of these DACs, new techniques in...

In this review paper, we analyze the downlink of a massive multiuser multiple-input multiple-output system in which the base station is equipped with low-resolution digital-to-analog converters (DACs). Using Bussgang’s theorem, we characterize the sum-rate achievable with a Gaussian codebook and scaled nearestneighbor decoding at the user equipments (UE). For the case of 1bit DACs, we show how ...

We consider the downlink of a massive multiuser (MU) multiple-input multiple-output (MIMO) system in which the base station (BS) is equipped with low-resolution digitalto-analog converters (DACs). As opposed to recent results for such BS architectures, we assume that the system operates over a frequency-selective wideband channel and uses orthogonal frequency division multiplexing (OFDM) to sim...

In the last years the technology improvement of Digital-to-Analog Converters (DACs) has extended the use of digital techniques in a multitude of applications. Consequently, there is an increasing attention to DAC topics, from researchers and manufacturers. The paper is aimed at providing a metrological overview and the leading trends of the research in the field of DACs.

A quantitative analysis of time series of ultraviolet spectra from a sample of 10 bright O-type stars (cf. Kaper et al. 1996, Paper I) is presented. Migrating discrete absorption components (DACs), responsible for the observed variability in the UV resonance doublets, are modeled. To isolate the DACs from the underlying P Cygni lines, a method is developed to construct a template (“least-absorp...

Program Number: 4164 Poster Board Number: A0169 Presentation Time: 8:30 AM–10:15 AM Changes in dopaminergic cells during progression of retinal degeneration Elena Ivanova1, 2, Botir Sagdullaev1, 2. 1Ophthalmology, Weill Medical College of Cornell University, New York, NY; 2Burke Medical Research Institute, White Plains, NY. Purpose: In the retina, dopamine is released by a single type of interp...

NEW PRODUCTS Data Converters • 12-bit 5V DACs have world’s lowest power consumption (MAX530/531/538/539) 17 • Dual 12-bit multiplying DACs have buffered voltage outputs (MX7837/7847) 17 Op Amps/Comparators • Low-power dual/quad op amps consume less than 1.2μA (MAX417/418/419) 17 • 10ns, 5V comparators—70% less power than alternative devices (MAX912/913) 18 • 6ns comparators resolve 2mV signals ...

The Data & Analysis Center for Software (DACS) is a Department of Defense (DoD) Information Analysis Center (IAC), administratively managed by the Defense Technical Information Center (DTIC) under the DoD IAC Program. The DACS is technically managed by Air Force Research Laboratory Information Directorate (AFRL/IF) Rome Research Site. ITT Industries-Systems Division manages and operates the DAC...