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Approximate circuit design is an innovative paradigm for error-resilient image and signal processing applications. Multiplication is often a fundamental function for many of these applications. In this paper, three approximate compressors are proposed with an accuracy constraint for the partial product reduction (PPR) in a multiplier. Both approximation and truncation are considered in the approximate...
This work studies the impact of outdated channel state information (CSI) on decode-and-forward (DF) buffer-aided underlay cognitive relay networks (CRNs), with the following three key constraints considered: the maximum transmit power of the secondary network (P), the peak interference power at the primary user (I) and the interference power at the secondary network caused by the primary network (P...
In this paper, we analyze some basic metrics of an energy harvesting (EH) wireless network which consists of some EH access points (APs). The energy harvesting wireless network is modeled as a Poisson network. In the system, energy is harvested randomly from the environment and stored in energy queue (rechargeable battery) for data transmission. Obviously, the instability of energy will impact the...
A novel multipath mitigation algorithm for multiplex binary offset carrier (MBOC) signals in the Global Navigation Satellite System (GNSS) is presented. Based on the W2 code correlation reference waveform (CCRW) structure, a series of bipolar reference waveform (BRW) are introduced to shape the unambiguous s-curve. The shaped s-curve has a single stable zero-crossing point, and the problem of unambiguous...
This paper examines the results of Wideband High Frequency (WBHF) Near Vertical Incidence Skywave (NVIS) Over-The-Air (OTA) testing conducted in the upper Midwest region of the United States of America (USA). Two distances, 45 miles and 180 miles, were used for evaluating data throughput performance over very short and typical distance NVIS links. Two separate trials were conducted, one in early summer,...
Cooperative communication is one of the fundamental technologies for the future wireless networks including 5G to improve communication reliability and enhance spectrum efficiency. In this paper, we consider a buffer-aided relay that performs opportunistic selection of the legitimate users in presence of an eavesdropper under physical layer security constraints. The channel state information of users...
This paper proposes and analyzes an efficient cooperative relaying selection scheme (eCoRSS) based on time division multiple access (TDMA) for military tactical multi-hop wireless networks (MTMWNs). The scheme uses a set of idle neighbors to reach a relay node, after the neighbors meet the conditions for serving as assistant nodes. The assistant nodes with a high channel quality are allowed to transmit...
The effect of group delay ripple (GDR) of non-ideal delay line (DL) causes an unexpected type of distortion in transmitted reference (TR) ultra wide bandwidth (UWB) systems. In this paper, we propose a new TR transceiver structure, where the GDR information of DL at the receiver is introduced into the transmitter to mitigate the performance error due to the GDR. Through Monte Carlo simulation, it...
Filter designing has been an important field in communication. The filter to be designed is needed to have some basic characteristics like narrow transition width, high output SNR, less hardware complexity and low cost. In this paper IIR filters have been designed and simulated for Myriametre band. Their performance analysis and cost comparisons have been done. Butterworth filter is found to be least...
In this paper, the effective capacity, a link-layer model supporting Quality of Service (QoS) metrics such as user data rate, packet loss rate and service delay, is analyzed. We consider an underlay cognitive cooperative relay network (CCRN) subject to independent non-identically distributed aH fading. An analytical expression of the effective capacity is derived by means of Fox H-functions and Meijer...
A 60 GHz wireless communication system has been proposed as a replacement for data cables in a data-center cabinet in order to reduce the significant cooling energy costs. This paper investigates the feasibility of placing adaptive absorber-reflector regions on the sides of a cabinet as a static channel fading counter-measure and also to optimize performance for a particular server. As a result of...
Underwater communication is predominantly by acoustic waves. However the attenuation and delay associated with the acoustic channel limits the range and data rate supported. Channel simulators are required to support the deployment of expensive experimental setup which relies on the characterization of the underwater acoustic channel. Acoustic communication is suitable at low frequency. Since the...
This paper proposes a low complexity fine frame synchronization method based on channel impulse response (CIR) estimation for DVB-T2 system. The proposed algorithm resolves the CIR rotation ambiguity, which is caused by the error in the coarse frame synchronization due to stronger secondary paths, using a novel scheme for channel and SNR estimation. Unlike previous methods that utilize the data symbols,...
The paper puts forward a method of modulation recognition of communication signals based on their correlation characteristics under the ideal gauss white noise conditions. The spectrum peaks' amounts, amplitudes, and location variance of signals' delay correlation and instantaneous correlation were extracted as the feature parameters. As the simulation results shown, compared to other modulation recognition...
Gammatone filterbanks are widely used in computational auditory models for modeling the peripheral filtering function of the cochlea. However, the high computational complexity and time consumption limits its usage in portable acoustic applications. To address this issue, a realtime and efficient digital implementation of Gammatone filterbank is proposed. The decomposed signal can be resynthesized...
A novel acquisition method of the Long-range navigation (Loran)-C signal based on matched filter is proposed to improve the acquisition performance of Loran-C signal under heavy noise environment. Higher signal to noise ratio (SNR) could be obtained through matched filtering the received signals. Then outputs are correlated with standard pulse signal and the correlation peaks are judged. Theoretical...
Smart grid represents a significant new technology of improving the efficiency, reliability and economics of the production, transmission and distribution of electricity that helps reduce carbon emissions. Communication networks become a key to achieving smart grid benefits due to their capability of delivering data and control signals. However, there does not exist a unified approach to quantify...
We propose a simple distributed uplink power control scheme based on the Foschini-Miljanic algorithm but driven by the queue sizes of each mobile station. The resulting data rates are proportional to the queue backlog of each mobile, such that the total power consumption is equal to a target value. Using analysis we establish convergence and characterize the equilibrium, and use simulations to study...
This paper presents the algorithm and results of designing optimal frequency sequences for Very Long Baseline Interferometry (VLBI) Bandwidth Synthesis (BWS) in VLBI experiments conducted jointly by Chinese Deep Space Stations (CDSS) and Chinese VLBI Stations (CVS). The optimization algorithm based on global search is intended to get lower peak side lobe level of delay resolution function and larger...
In this paper, the resource allocation problem is investigated for Device-to-Device (D2D) communications underlaying cellular networks with bursty traffic arrival. We formulate an infinite horizon average reward constraint Markov decision process (CMDP) that aims at minimizing the average delay under the dropping propability constraint. Then, we present a reduced-state Bellman's equation with linear...
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