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Asymmetry is unquestionably an important characteristic of the wireless propagation channel, which needs to be accurately modeled for wireless and mobile communications, 5G networks, and associated applications such as indoor/outdoor localization. This paper reports on the potential causes of propagation asymmetry. Practical channel measurements at Khalifa University premises proved that wireless...
In this paper, new exact and approximate moment generating functions (MGF) expression for generalized fading models are derived. Specifically, we consider the η-λ-μ, α-μ, α-η-μ, α-λ-μ, α-κ-μ, and α-λ-η-μ generalized fading distributions to derive approximate MGF expressions. The new expressions are very accurate and, in contrast to earlier results in the literature, avoid any complicated special functions,...
Wireless communications literature is very rich with empirical studies and measurement campaigns that study the nature of the wireless propagation channel. However, despite their undoubted usefulness, many of these studies have omitted a fundamental yet key feature of the physical signal propagation, that is, wireless propagation asymmetry. This feature does not agree with the electromagnetic reciprocity...
Computer vision is one of the most active research fields in information technology today. Giving machines and robots the ability to see and comprehend the surrounding world at the speed of sight creates endless potential applications and opportunities. Feature detection and description algorithms can be indeed considered as the retina of the eyes of such machines and robots. However, these algorithms...
In this paper, we introduce a novel performance analysis of the η-μ generalized radio fading channels with integer value of the μ fading parameter, i.e. with even number of multipath clusters. This fading model includes other fading models as special cases such as the Nakagami-rn, the Hoyt, and the Rayleigh. We obtain novel unified and generic simple closed-form expressions for the average bit error...
Chaotic Communications have drawn a great deal of attention to the wireless communication industry and research due to its limitless meritorious features, including excellent anti-fading and anti-intercept capabilities and jamming resistance exempli gratia. Differential Chaos Shift Keying (DCSK) is of particular interest due to its low-complexity and low-power and many attractive properties. However,...
In this paper, a novel unified analytical expression for average bit error rates (ABER) and average channel capacity (ACC) is presented for the к-μ shadowed fading model. This model has recently shown to be suitable for underwater acoustic wireless channel modeling using the measurements conducted by the Naval Research Laboratory [1], and is not so well covered in the public literature. Deploying...
This paper presents a novel multi-intensity image labeling algorithm tailored to provide high throughput for real-time computer vision and robotics applications. The algorithm overcomes and alleviates many drawbacks of the earlier labeling techniques. With the aid of the newly introduced pre- and post-equivalence solving stages, it assigns each pixel the correct label value with the minimal possible...
The paper presents a novel technique to segment and extract streets from satellite images. This technique utilizes, for the first time in the known literature, the Maximally Stable Extremal Regions (MSER) algorithm to robustly identify and segment streets from satellite images. The technique extracts dark MSERs and then classifies them based on multiple metrics such as the intensity of the pixels,...
This paper presents a novel hardware accelerator architecture for the linear-time Maximally Stable Extremal Regions (MSER) detector algorithm. In contrast to the standard MSER algorithm, the linear-time MSER implementation is more suitable for real-time applications of image retrieval in large-scale and high resolution datasets (e.g. satellite images). The linear-time MSER accelerator design is optimized...
This paper presents a novel implementation of the Maximally Stable Extremal Regions (MSER) detector on system-on-chip (SoC) using 65nm CMOS technology. The novel SoC was developed following the Application Specific Integrated Circuit (ASIC) design flow which significantly enhanced its realization and fabrication, and overall performances. The SoC has very low area requirement (around 0.05 mm2) and...
This paper presents a new fast and scalable Parallel Union-Find algorithm for image segmentation and its System-on-Chip (SoC) implementation using 65nm CMOS technology following the Application-Specific Integrated Circuit (ASIC) design flow. The algorithm is capable of labeling all foreground and background pixels, using the least possible pixels scanning. This contrasts the classical labeling algorithms...
Vehicular ad hoc networks (VANET) are emerging as a prominent form of mobile ad hoc networks (MANETs) and as an effective technology for providing a wide range of safety applications for vehicle passengers. Nowadays, VANETs are of an increasing importance as they enable accessing a large variety of ubiquitous services. Such increase is also associated with a similar increase in vulnerabilities in...
In this paper, a novel performance analysis of the multi-access multiple-input multiple-output relay reference-modulated differential chaos shift keying cooperative diversity (RM-DCSK-CD) is presented. New closed-form expressions for the average bit error rates are derived for multiple relaying protocols. The carried analysis is based on a novel approximation of the bit error rates of RM-DCSK systems...
This paper introduces a dramatically novel traffic signs recognition (TSR) system that can perform traffic sign detection and tracking simultaneously. The proposed approach utilizes intensity images and the depth images, in parallel, to robustly detect and track traffic signs in real-time. Additionally, we suggest to supplement the ordinary traffic signs with the corresponding quick-response (QR)...
This paper presents a novel unified performance analysis of Space-Time Block Codes (STBCs) operating in the Multiple Input Multiple Output (MIMO) network. Specifically, we derive a novel unified expression for the average bit error rate for all coherent modulation schemes assuming independent and identically distributed generalized-K fading channels, which accounts for both multipath fading and shadowing,...
Image segmentation is an essential preprocessing step for many computer vision and image processing applications. Implementing algorithms that handle such images in hardware will speed up the processing task considerably. In this paper, a new robust histogram-based image segmentation ASIC design of a System-on-Chip (SoC) using 65nm technology is presented. With a clock frequency of 289 MHz, the SoC...
Many generalized fading distributions are given in terms of special functions, complicating the analysis of wireless performance metrics. This paper presents novel approximations to the extended incomplete gamma function, the modified Bessel function of the second type, and the generalized Q-function. New simpler and unified form for the probability density function of the extended generalized-K (EGK)...
This paper presents a new Zero-Crossing Digital Phase-Locked Loop (ZC-DPLL) for frequency synchronization and tracking. The proposed hyperbolic Σ-Δ based ZC-DPLL has an improved time jitter by a factor of 6.4 and an extended lock-in range by a factor of sinh(π)/π. These significant improvements were achieved by introducing a hyperbolic nonlinearity and a modified Σ-Δ blocks to the original ZC-DPLL...
In this paper, a novel unified performance analysis of wireless communications over generalized fading channels in terms of the Average Bit Error Rate (ABER) is presented. We derive simple and accurate, exact and approximate, closed-form expressions for ABER, encapsulating all coherent modulations, for the α-η-μ, the α-λ-μ and the α-λ-μ-η, generalized fading distribution, which accurately characterize...
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