Simulation of A Communications System Using Matlab

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Polytechnique Montreal

The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

Simulation of A Communications System Using Matlab

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In this paper, we propose an adaptive medium access control (MAC) protocol for full-duplex (FD) cognitive radio networks in which FD secondary users (SUs) perform channel contention followed by concurrent spectrum sensing and transmission, and transmission only with maximum power in two different stages (called the FD sensing and transmission stages, respectively) in each contention and access cycle. The proposed FD cognitive MAC (FDC-MAC) protocol does not require synchronization among SUs, and it efciently utilizes the spectrum and mitigates the self-interference in the FD transceiver. We develop a mathematical model to analyze the throughput performance of the FDC-MAC protocol, where both half-duplex (HD) transmission and FD transmission modes are considered in the transmission stage. Then, we study the FDC-MAC conguration optimization through adaptively controlling the spectrum sensing duration and transmit power level in the FD sensing stage.We prove that there exists optimal sensing time and transmit power to achieve the maximum throughput, and we develop an algorithm to congure the proposed FDC-MAC protocol. Extensive numerical results are presented to illustrate the optimal FDC-MAC conguration and the impacts of protocol parameters and the self-interference cancellation quality on the throughput performance. Moreover, we demonstrate the signicant throughput gains of the FDC-MAC protocol with respect to the existing HD MAC and single-stage FD MAC protocols

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In this paper, we propose a semi-distributed cooperative spectrum sen sing (SDCSS) and channel access framework for multi-channel cognitive radio networks (CRNs). In particular, we c onsider a SDCSS scheme where secondary users (SUs) perform sensing and exchange sensing outcomes with ea ch other to locate spectrum holes. In addition, we devise the p -persistent CSMA-based cognitive MAC protocol integrating the SDCSS to enable efficient spectrum sharing among SUs. We then perform throughput analysis and develop an algorithm to determine the spectrum sensing and access parameters to maximize the throughput for a given allocation of channel sensing sets. Moreover, we consider the spectrum sensing set optimization problem for SUs to maxim ize the overall system throughput. We present both exhaustive search and low-complexity greedy algorithms to determine the sensing sets for SUs and analyze their complexity. We also show how our design and analysis can be extended to consider reporting errors. Finally, extensive numerical results are presented to demonstrate the sig nificant performance gain of our optimized design framework with respect to non-optimized designs as well as the imp acts of different protocol parameters on the throughput performance.

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Dubai, known for its towering skyscrapers, luxurious lifestyle, and relentless pursuit of innovation, often finds itself in the global spotlight. However, amidst the glitz and glamour, the emirate faces its own set of challenges, including the occasional threat of flooding. In recent years, Dubai has experienced sporadic but significant floods, disrupting normalcy and posing unique challenges to its infrastructure. Among the critical nodes in this bustling metropolis is the Dubai International Airport, a vital hub connecting the world. This article delves into the intersection of Dubai flood events and the resilience demonstrated by the Dubai International Airport in the face of such challenges.

Rising Above_ Dubai Floods and the Fortitude of Dubai International Airport.pdf

Rising Above_ Dubai Floods and the Fortitude of Dubai International Airport.pdf

Rising Above_ Dubai Floods and the Fortitude of Dubai International Airport.pdf

The Good, the Bad and the Governed - Why is governance a dirty word? David O'Neill, Chief Operating Officer - APIContext Apidays New York 2024: The API Economy in the AI Era (April 30 & May 1, 2024) ------ Check out our conferences at https://www.apidays.global/ Do you want to sponsor or talk at one of our conferences? https://apidays.typeform.com/to/ILJeAaV8 Learn more on APIscene, the global media made by the community for the community: https://www.apiscene.io Explore the API ecosystem with the API Landscape: https://apilandscape.apiscene.io/

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