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Although the LPDDR4 interface has enabled industry requirements, such as low power consumption and high bandwidth, additional evolution of the current LPDDR4 performance is expected. To respond to the need for more power efficient devices with higher bandwidth, a 2nd generation LPDDR4 (referred to as LPDDR4X), with extreme low power and extended performance, has been developed in this work. In the...
In this paper we consider the problem of state estimation for linear discrete-time Gaussian systems with intermittent observations resulting from packet dropouts. We assume that the receiver does not know the sequence of packet dropouts. This is a typical situation, e.g., in wireless sensor networks. Under this hypothesis, the problem of state estimation has been previously solved by the authors using...
A new method for passive detection problem with multi-static radar system is proposed. The direct-path signals in the surveillance channels are retained in the signal model. Utilizing both the reference signals and surveillance signals to obtain more accurate estimate for the illuminator of opportunity (IO) signals successively, a generalized likelihood ratio test (GLRT) detector is derived. Due to...
This paper presents a new 8-PSK Super Regenerative Receiver operating in 402–405 MHz MICS band. The proposed topology employs minimum components to design phase detection engine. The receiver utilizes a combined Low Noise Amplifier (LNA) and Super Regenerative Oscillator (SRO) for current reuse purpose and a digital phase detection engine that extracts modulated phase information, via Latches and...
In this paper, a cooperative diffusion-based molecular communication system is considered where distributed receivers collaboratively determine a transmitter's signal. In this system, the receivers first make local hard decisions about the current transmitted bit and then report these decisions to a fusion center (FC). The FC combines the local hard decisions to make a global decision using an N-out-of-K...
This paper presents an analytical comparison of active and passive receiver models in diffusive molecular communication. In the active model, molecules are absorbed when they collide with the receiver surface. In the passive model, the receiver is a virtual boundary that does not affect molecule behavior. Two approaches are presented to derive transforms between the receiver signals. As an example,...
This work studies communication over diffusion- based molecular timing (DBMT) channels. The transmitter {\em simultaneously} releases {\em multiple} small information particles, where the information is encoded in the time of release. The receiver decodes the transmitted information based on the random time of arrival of the information particles, which is represented as an additive noise channel...
The maximal ratio combining (MRC) receiver has excellent performance in the uplink of massive multiple-input-multiple-output (MIMO) systems under favorable propagation, but the performance degrades very much in a harsh channel because of interference. Theoretical analysis showing this phenomenon is given for a particular class of fading channel. A novel receiver, exploiting preemphasis/deemphasis...
Compared with the conventional amplitude phase modulation (APM), spatial modulation (SM) is a low- complexity, yet energy-efficient transmission technique, whereby transmit antenna (TA) indices are utilized to convey the information. However, the number of the required TAs grows exponentially with the number of transmitted bits, which leads to unacceptable pilot overhead for channel estimation in...
The Median of Maxima Estimate (MOME) receiver is a distribution-free Constant False Alarm Rate (CFAR) receiver used to detect signal bursts against a time-varying, non-Gaussian background. Receiver configuration requires selecting four parameters that determine detection performance and adaptation rate. A semi-analytic method of determining the false alarm rate is proposed. This procedure avoids time...
In this modern era, mobile phone has great impact on daily life and is used for exchange of information in the form of text, audio, email and images. Though it has many positive impacts but its negative impact in teenagers can not be neglected. These negative impact can be reduced by continuous monitoring. This paper presents a novel user defined system model to detect abnormal behavior of cell phone...
In this paper, a novel closed form expressions for the area under the receiver operating characteristic curve (AUC) of an energy detector is measured over generalized fading channel in terms of computable Meijer G-function. We consider the reporting channel in the Multiple-Input Multiple-Output (MIMO) based centralized cooperative spectrum sensing is experiencing a κ — μ fading channel. We assume...
Spectrum is the lifeblood of the future wireless networks and the data storm driven by the emerging technologies like Internet of Things, video over wireless will lead to a pressing artificial spectrum scarcity. Future smart terminals will need to quickly assess the spectrum usage and opportunistically use the available spectrum to overcome this challenge. They require energy-efficient spectrum scanning...
Cognitive Radio (CR) is an intelligent system for opportunistically accessing the idle resources and a solution for spectrum resources scarcity. The main purpose of this article is to analyze the performance of Energy Detection under Nakagami and Rayleigh fading channels and compare it with the case of when there is only AWGN. Probability of detection and probability of false alarm are used to characterize...
The research is devoted to the reduction of multiple access interference (MAI) in chaos-based asynchronous direct sequence code division multiple access (DS-CDMA) communication systems by use of spreading sequences which are selected from a large set of generated chaotic sequences. For the generation of binary chaotic spreading sequences different 1-dimensional maps are examined. As selection criteria...
We develop two resistant to noise secure communication schemes based on time-delayed feedback oscillators with switching of chaotic regimes. One of the proposed schemes exploits the identical synchronization between the transmitter and receiver while another system uses the regime of generalized synchronization. The proposed schemes are studied numerically and implemented in a physical experiment.
Non-orthogonal multiple access as a promising technology is expected to support massive connectivity in the next generation. In this paper, we propose a novel perfect energy spread transform (P-EST) based multiple access scheme, which perfectly spreads a symbol energy all over the frequency-domain and time-domain increasing the diversity gain of the system. The parameters of the proposed scheme can...
In this paper, we investigate the achievable uplink spectral efficiency (SE) and its approximate analytical expression in massive multi-input multi-output (MIMO) systems, using finite precision analog-digital converters (ADCs) and zeroforcing (ZF) technique at the receivers. To analyze the system performance, we adopt the additive quantization noise model, where the quantization noise is treated as...
Time of signal arrival determination accuracy has a great impact on a UWB positioning system performance. The method proposed in the paper utilizes samples of a baseband signal available in direct conversion receivers. The time of arrival is calculated from quadrature signal components. The paper contains the description of the proposed method and presents results of its investigation. The method...
Non-orthogonal multiple access (NOMA), which improves spectrum efficiency and system throughput, is one of the promising radio access techniques for 5G. In this paper, NOMA is combined with spatial multiplexing multiple-input multiple-output (MIMO) technology for enhanced spectral efficiency. In multi-stream MIMO signaling, we considered stronger far user's MIMO signal when detecting the near user's...
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