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The unique tail bits retention failure behavior is observed in the RRAM array. Unlike the previous reports on single device or the average value''s retention behavior, quick retention loss of tail bits is found for both LRS and HRS. By statistically characterized such relaxation effect of tail bits, physical models are built to quantitatively describe the relaxation behaviors of LRS and HRS. The correlation...
We address the problem of pilot decontamination for massive MIMO systems for finite dimensional channels, wherein the channel vectors between the users and the base station are composed of a finite number of discrete paths. The pilot decontamination problem is addressed using high-resolution parametric spectral estimation methods, such as root multiple-signal classification (root-MUSIC), for resolving...
This paper presents a computationally efficient Direction-Of-Arrival (DOA) estimation method for Uniform Rectangular Array (URA), which is effective for both correlated and uncorrelated sources. The proposed method is an extension of our previous study for Uniform Linear Array (ULA), basically based on the relation between the elements of array covariance matrix, does not need iteration, angular peak-search...
Single-sensor color cameras, which classically use a color filter array (CFA) to sample RGB channels, have recently been extended to the multispectral domain. To sample more than three wavelength bands, such systems use a multispectral filter array (MSFA) that provides a raw image in which a single channel level is available at each pixel. A demosaicing procedure is then needed to estimate a multispectral...
We suggest an effective method for solving the problem of correlation clustering. This method is based on an extension of a partial tolerance relation to clusters. We present several implementation of this method using different data structures, and we show a method to speed up the execution by a quasi-parallelism.
Since 2002 many works have been published applying Principal Component Analysis (PCA) in the study of network traffic. These investigations have revealed some issues inherent to the temporal and spatial correlations present in the data, which are not considered in PCA. The proposed solutions to these problems include the formulation of a new matrix of data “rearranged” to take these effects into consideration...
It is well known that most wireless channels are sparse. The channel impulse responses (CIRs) of certain size antenna array have a partially shared support due to the spatial correlation. Moreover, the CIRs during adjacent symbols have a common support due to the temporal correlation. In this paper, we propose a novel compressed channel estimation scheme for the uplink massive multi-input multi-out...
The smart antennas are widely used for wireless communication because it has an ability to increase the coverage capacity of a communication system. The main purpose of the smart antenna system is the selection of smart algorithms for adaptive array. On this paper, one of the adaptive beam forming approach used in smart antennas called Recursive Least Square Algorithm (RLS) is presented. The efficiency...
This paper presents the design and evaluation of a large scale template-based Coarse-Grained Reconfigurable Array (CGRA) generated accelerator that processes correlation algorithm for Timing Synchronization (TS) required in Orthogonal Frequency-Division Multiplexing (OFDM) receivers. The CGRA works as a coprocessor with a Reduced Instruction-Set Computing (RISC) processor. The CGRA accelerator is...
This paper generalizes a new algorithm for Direction of Arrival (DoA) estimation in one and two dimensional (1D and 2D) underwater non-uniform sensor array networks (UWSANs). The extension of augmented matrix approach from the minimum redundancy array (MRA) to the nested array and co-prime array is the main issue addressed in this work. We elaborate numerical examples of how to construct these new...
This paper presents the implementation of Orthogonal Frequency-Division Multiplexing receiver blocks as accelerators using a template-based Coarse-Grained Reconfigurable Array (CGRA) device. The CGRA operates with a Reduced Instruction-Set Computing (RISC) processor so that the overall system yields the benefits of general- and special-purpose processing. The accelerators are designed by crafting...
A beamformer system for a linear two-element interferometer aligned east-west is implemented. Two phase shifters based on a delay line technique, using coaxial cables and a diode network for selection and deselection of phases, are implemented at a centre frequency of 10.7 MHz. Each phase shifter consists of 6 bits, that are controlled digitally using an Arduino board, to produce 64 discrete phase...
It is well known that waveforms can be designed to maximize the SNR of objects with specific desired features. In some cases, it may be desirable to tune a waveform for different features at different angles. A MIMO radar can transmit multiple waveforms across a large span of angles. It is possible to design a MIMO radar waveform transmitted from individual elements to achieve the desired waveform...
In this paper, we propose a precorrelation direction lock loop (DiLL) scheme and a new modification factor estimation method for the global navigation satellite system (GNSS) receivers. The proposed scheme executes spatial correlation before code demodulator and does not need to do code demodulation for every antenna element. It can decrease the number of code demodulator to 3 regardless of the array...
This paper describes the implications of Bias Temperature Instability (BTI) related time-dependent threshold voltage distributions on the performance and yield of devices and SRAM cells. We show that nFET and pFET time-dependent variability, in addition to the standard time-zero variability, can be fully characterized and projected using a series of measurements on a large test element group (TEG)...
Adaptive beamforming algorithm performance decreases sharply with the increase of array errors. Beamforming algorithm based on diagonal loading is a simple and effective method for improving robustness. But it is difficult to determine the optimal diagonal loading factor, and the fixed load value does not change with the array error, reduce the loading effect. To solve the above problems, this paper...
Coincidence imaging radar (CIR) can achieve super-resolution in real aperture staring radar imagery by employing temporal-spatial independent array detecting (TSIAD) signals. The characteristics of TSIAD signals are determined by the random signal waveform and the array geometry, and the imaging performance is influenced by the relative imaging position with respect to the antenna array. In this paper,...
In this paper, two techniques have been presented for slippage detection. They are independent of sensor signal type and are promising for general use on tactile array sensors. The first method is based on frequency analysis of the correlation coefficient sequence of sensor array data sampled as time evolves. The main idea is that a slippage causes heavier fluctuation in the sensor signal distribution...
In this paper, a compression technique for ECG signal using low-rank matrix approximation based on inter and intra beat correlation, is presented. Here, singular value decomposition (SVD) has been exploited to explore the low rank representation using truncation process that stores most significant data with few singular values. In this method, two dimensional (2-D) array of ECG signal is constructed...
Massive MIMO has two key problems: the low-transmission efficiency caused by channel state information (CSI) feedback overhead and huge computational complexity. Authors have proposed a practical application of Massive MIMO, that is, Massive Antenna System for Wireless Entrance links (MAS-WE), and the performance of the proposed systems have been verified by computer simulations and a propagation...
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