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This paper presents a sub-pA current read-out interface that consists of a series connection of a low-noise current amplifier and a second-order continuous-time Delta-Sigma modulator. Contrary to the approach to the current amplification by means of a series connection of a charge integrator and differentiator, no reset and thus no interruption of the current-to-digital conversion needs to be performed...
Acoustoelectric (AE) imaging is a new technique for mapping current densities in the heart and brain at a high resolution determined by the size of the ultrasound (US) focus. Because the amplitude of the AE interaction signal in biological tissue is weak (on order of 1 μV), detection of small currents is challenging with poor signal-to-noise ratio (SNR). Because optimal detection depends on minimizing...
The increasing demand for underlaying cellular network has benefit form Device-to-Device (D2D) communication, where one need to apply productive plan for resource allocation to increase system capacity and mitigate interference. The bipartite graph matching strategy is used for optimizing the resource allocation among all other strategies; Kuhn-Munkres (KM) is one of algorithm applied to increase...
This paper presents a low-noise, low-power CMOS interface circuit for MEMS gyroscope readout ASIC. Our interface circuit is composed of a continuous-time delta-sigma modulator, an anti-aliasing filter, and an on-chip reference generator. By using a low-pass delta-sigma modulator instead of a band-pass delta-sigma modulator, a frequency matching circuit is unnecessary which enables wideband operation...
This article investigates photoconductive THz detectors based on low-temperature-grown InGaAs/InAlAs with a localized Be doping profile. With this approach we address the inherent trade-off between ultrafast carrier trapping and high mobility in photoconductors. The processed detector antennas show an excellent performance and feature a detection bandwidth of more than 6 THz and a signal-to-noise...
A novel terahertz (THz) deconvolution technique based on the autoregressive (AR) spectral extrapolation is presented in this study. An autoregressive process is modeled based on the THz frequency components with high signal-to-noise ratio, and the missing frequency components in regions with low signal-to-noise ratio are extrapolated based on the autoregressive model. In this way, the entire THz frequency...
Fundamental physical constraints, such as noise and channel capacity, set an upper bound to theoretical performance of many systems. In this work we examine the limitations of high-speed data in modern digital wireless radio systems. Although physical constraints provide an ultimate limit, we show that signal-to-noise-plus-distortion-ratio (SNDR) and nonlinearity of modern CMOS and Bipolar technologies...
Relentless pursuit of Moore's law, while providing immense speed, power, and cost benefits in digital circuits, has thrown open many challenges in analog circuit design, especially analog-to-digital converter (ADC) design. Present day ADC's must be able to achieve an extremely high level of performance in terms of both resolution and bandwidth. High-resolution and high-bandwidth input modulated parallel...
Providing services to devices with varied rate, latency and energy consumption requirements is a major challenge for 5th Generation (5G) radio access technology. Overlay transmission or non-orthogonal multiple access, wherein multiple devices with same or different service requirements use the same time-frequency resources, may overcome the poor trunking efficiency of dedicated resource allocation...
Low Power Wide Area Networks (LPWAN) are expected to interconnect a high number of simple and inexpensive devices. The ability to control transmission parameters including modulation scheme and output power, enables reduction of the deployment costs, improvement of the network reliability, in terms of error performance under suboptimal conditions, and could contribute to the reduction of the maintenance...
We numerically investigate the effects of a minute femtosecond pulse seed on continuous wave pumped supercontinuum generation when the frequency shift of the seed varies.
This paper describes a method to increase the sensitivity of a digital radio receiver based on the time synchronous averaging (TSA). The data to be send are grouped into a block and the block is retransmitted multiple times. Received blocks are synchronously averaged thus increasing the signal-to-noise ratio. The TSA can be performed on the analog signal at the demodulator output (soft TSA) or on...
The cognitive radio (CR) have been proposed to improve spectral efficiency and to meet growing demands for higher data rates in mobile communications and satellite communications. In this paper, we propose a blind estimation algorithm for a secondary user to estimate transmission parameters of the primary signal in an OFDM overlay system, using only the available fast Fourier transform (FFT) component...
We experimentally demonstrate transmission of 20×50-Gb/s WDM PAM-4 channels over an 80-km uncompensated fiber link, based on reduced complexity DSP and hardware. BER values below pre-FEC limit of 3.8×10·3 are reported, validating the proposed architecture for low-cost, high-capacity short-reach connectivity.
High-accuracy indoor radio positioning can be achieved by using high signal bandwidths to increase the time resolution. Multiple fixed anchor nodes are needed to compute the position or alternatively, reflected multipath components can be exploited with a single anchor. In this work, we propose a method that explores the time and angular domains with a single anchor. This is enabled by switching between...
We propose and experimentally demonstrate a novel channel-independent multi-band orthogonal circulant matrix transform (MB-OCT) precoding, to efficiently combat the severe frequency-selective fading induced by the limited modulation bandwidth of visible light communication (VLC). The proposed MB-OCT precoding exhibits ladder-like signal-to-noise-ratio (SNR) profile, thus significant BER reduction...
We propose a joint multi-polarization-effect equalization scheme using two Kalman filters in a faster than Nyquist-WDM transmission system, which can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss (PDL) and polarization mode dispersion (P MD).
We experimentally demonstrate 56-Gb/s quadrature-amplitude-coding PAM under a 9-GHz bandwidth limitation in a conventional direct-detection system. We also confirm the scheme requires fewer feed-forward equalizer taps at the receiver than conventional PAM4.
The growing requirements of mobile broad band services like MIMO, combined with OFDM involved in 4g wireless networks were met by Long Term Evolution (LTE).OFDM is used in communication systems to provide high data rates, and is more immune to intercarrier interference, and intersymbol interference. OFDM has become the core of LTE system. In this paper the performance of the system is evaluated interms...
In this paper we demonstrate a low-complexity pre-emphasis technique for electronic subcarrier-multiplexed signals to mitigate transceiver bandwidth limitations. As opposed to traditional FFT/FIR-based pre-emphasis techniques, we propose a simple and effective power-ratio optimization between electronic subcarriers that requires only 1 real multiplication per subcarrier.
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