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A non-orthogonal multicarrier signal, termed spectrally efficient frequency division multiplexing (SEFDM), is investigated in this work. It improves spectral efficiency by compressing sub-carrier spacing below the symbol rate at the cost of self-created inter carrier interference (ICI). Sphere decoding (SD) is an efficient method to recover signals approaching maximum likelihood (ML) performance....
A new architecture of monolithic THz imager adopting a VCO-based signal processing is proposed, and the enhancement of signal-to-noise ratio is analyzed. The 0.5/1.5 THz imagers, implemented in a 65 nm CMOS, show the lower noise equivalent power (NEP) than that of the detector itself, presenting the best NEP among the state-of-the-art imagers. The fully integrated THz imagers do not require external...
Following the recent trend in the development of the renewable energy market, complemented with the future and emerging technologies, the leading role of the grid connected converter is well established. In the future energy market, as an interconnecting element, it will serve to secure reliable power supply with extraordinary power quality characteristics. This paper will aim at presenting the basic...
As an alternative to classical multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM), MIMO-OFDM with index modulation (MIMO-OFDM-IM), which provides a flexible trade-off between spectral efficiency and error performance, has attracted considerable interest recently. However, in order to detect the active subcarrier indices and modulated symbols precisely, the receiver...
In this paper, an enhanced scheme of Index Modulation for Orthogonal Frequency Division Multiplexing (IM-OFDM), called Repeated IM-OFDM with Diversity Reception (ReIM-OFDM) is proposed. ReIM-OFDM achieves performance improvement over the convetional IM-OFDM at the same spectral efficiency by providing additional space and frequency diversity. Similar to IM-OFDM, the proposed ReIM-OFDM also activates...
In next generation communication systems high data rate, and higher transmission capacity through wireless channel are important for researchers. Filter bank based multicarrier (FBMC) modulation with offset quadrature amplitude modulation (OQAM) makes researchers interested due to its advantages over orthogonal frequency division multiplexing (OFDM). The paper indicates that OFDM, FBMC-QAM, multiple-input...
In this paper, we explain the THz detection mechanism in sub-threshold Si MOSFETs by exploiting the exponential dependence of channel electron density to the gate-source voltage. According to our theory, this high frequency non-linear dependence is the underlying mechanism for rectification of THz radiation. The maximum detection frequency is limited by dielectric relaxation time of the electrons...
In this paper, a low-power four-quadrant current multiplier based on the electronically and linearly tunable CMOS transconductors (EOTAs) is presented. The design technique is realized by using only two EOTAs as active circuit elements. The proposed current multiplier can operate for four quadrants with wide input dynamic range. The performances of the proposed current multiplier are tested on PSPICE...
Single-pixel cameras (SPC) are image capturing devices, which use only a single detector to collect information about the entire image, by making use of its spatial modulation. Although a single detector is enough to obtain images of good quality in idealistic conditions, in practice the SPC systems are prone to all sorts of noise, including variations of light intensity over time, ambient illumination...
The goal of tone mapping operators (TMOs) has traditionally been to display high dynamic range (HDR) pictures in a perceptually favorable way. However, when tone-mapped images are to be used for computer vision tasks such as keypoint detection, these design approaches are suboptimal. In this paper, we propose a new learning-based adaptive tone mapping framework which aims at enhancing keypoint stability...
Recently, a new multiple-input multiple-output (MIMO) transmission scheme termed as receive spatial modulation (RSM) is proposed, which activates a subset of receive antennas to carry additional information bits through the index domain. In this paper, a novel variant of RSM, which is referred to as enhanced RSM (ERSM), is proposed to further improve the system performance, especially in high-mobility...
Ultra-wide band (UWB) communication is a viable solution for Wireless Sensor Network (WSN) and Internet of Things (IoT) due to low cost and low power requirement. However, UWB transceiver design is more complex due to large bandwidth and precise synchronization requirement. In this paper, we propose a simple peak detection based non-coherent UWB receiver, suitable for low data rate WSN and IoT based...
Differential spatial modulation (DSM) is a novel attractive alternative technique for coherent spatial modulation (CSM) without channel state information (CSI) at the receiver. In this paper, iterative detection is firstly employed to improve the performance of DSM schemes. With the Hamming distance of two matrices reduced to the sum of simple elements, a lowcomplexity iterative detection scheme for...
It is known that by extracting log-likelihood ratio (LLR) values from the received MIMO signals, a MIMO detector is able to exchange a posteriori soft information with a channel decoder to improve the error performance. A minimum mean-square error with parallel interference cancellation (MMSE-PIC) detector is considered to be a practical MIMO detector, but the computational complexity for the LLR...
Instantaneous or statistical channel state information (CSI) is needed for most detection schemes developed in the molecular communication (MC) literature. Since the MC channel changes, e.g., due to variations in the velocity of flow, the temperature, or the distance between transmitter and receiver, CSI acquisition has to be conducted repeatedly to keep track of CSI variations. Frequent CSI acquisition...
This paper introduces a new approach to detect multiple inputs for touchless human machine interfaces. It is based on optical proximity sensing with visible or infrared light. It is described the principle of modulation, demodulation and system design. In the last part, some applications are presented to use this approach. The approach is based on multiple modulated light sources. The modulation is...
This paper presents a Dynamic Vision Sensor with a few interesting features. We directly readout the voltage on the logarithmic photo detector as the intensity information of the fired pixel. The computer is able to command the sensor to produce a full-frame picture at whatever time it needs. The sensor was implemented using AMS 0.35 μm 2P4M Opto process with an array of 384 × 320 pixels. Each pixel...
The new spatial modulation schemes that appeared in the early twenty-first century allow for a new exploitation of the space to an increase in the spectral efficiency of MIMO systems. These new schemes commonly referred to as spatial modulations use the index of the transmit (resp. the receive) antenna to transmit additional data. We concentrate our study on the spatial modulations at the receiver...
Multiple-input multiple-output orthogonal frequency division multiplexing with index modulation (MIMO-OFDM-IM), which provides a flexible trade-off between spectral efficiency and error performance, is recently proposed as a promising transmission technique for energy-efficient 5G wireless communication systems. However, due to the dependence of subcarrier symbols within each subblock and the strong...
We consider index modulation (IM) for single-carrier (SC) systems in this paper. Compared with conventional orthogonal frequency division multiplexing (OFDM) IM, the resulting approach, which is referred to as SCIM, has a better performance due to the path diversity gain under a multipath fading environment. For sparse IM, since compressive sensing (CS) algorithms can be used for low-complexity signal...
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