Cognitive radio platforms and testbeds

Čabrić, Danijela; Taubenheim, D.; Cafaro, Gio; Farrell, Ronan

doi:10.1016/b978-0-12-374715-0.00019-8

Cited by 3 publications

(2 citation statements)

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“…The software design flow is built using Matlab/ Simulink from Mathworks and Xilinx system generator, which are used to map high level design and state machine representation to FPGA configurations. BEE2-enhanced Xilinx Platform studio (BAPS) directly converts the Simulink design to FPGA configuration.This testbed is currently being used to evaluate the performance and limitations of spectrum sensing algorithms proposed for detection of primary user signals[74].For this case, implementation and experimental results have been presented for wideband energy detectors and cyclostationary feature detectors.Table 1.3 shows the comparison between various testbeds used for CR deployment.…”

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Design and measurement results for cooperative spectrum sharing

Vivek

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Scarcity of radio spectrum and inherent inefficiency of current spectrum allocation policies have spurred much research for alternative spectrum access techniques giving birth to the notion of cognitive radios. Recently, cooperative spectrum sharing (CSS) where two wireless systems operate over the same spectrum band albeit with different priorities has been proposed as a viable framework for cognitive radio. The primary system, comprising of a primary transmitter (PT) and primary receiver (PR), supports the relaying functionality. The secondary system, comprising of a secondary transmitter (ST) and secondary receiver (SR), operates on a secondary basis with the guarantee that its operation does not affect the primary system performance. However, most of the proposed CSS protocols are interference limited and the performance of the systems are limited by the amount of interference from one system to another. Consequently, there is a inherent tradeoff between the achievable performance of the primary and secondary systems. In this thesis, we try to resolve the above issue by proposing an interference-free CSS protocol known as orthogonal spectrum sharing scheme (OSSS), which alleviates the interference from the primary system to secondary system. The performance of OSSS has been demonstrated through simulation and analytical results. Another issue related to CSS protocols is the lack of measurement results to demonstrate their performance in a realistic environment. Hence, how much performance enhancement CSS can bring in a real wireless environment is still an viii open question. We try to answer this question by designing and developing a testbed for proof-of-concept demonstration and performance assessment of CSS protocols. The testbed is programmed to follow the OFDM standards in IEEE 802.11a. The performance of the testbed has been validated by obtaining both quantitative as well as qualitative results. Quantitative results are obtained by measuring the packet error rates for both primary and secondary systems whereas qualitative results are shown by utilizing a CSS protocol to successfully transmit two different images from PT to PR and ST to SR respectively. The spectrum access probability for the secondary system is also measured. Apart from the above, we also provide a theoretical format to analytically evaluate the back-off required in a nonlinear HPA while operating an OFDM based communication system. Thus the HPA can be operated with sufficient back-off so that nonlinear distortions due to HPA will have minimal impact on the obtained measurement results. As shown later in this thesis, an improper selection of backoff has considerable impact on the end-to-end symbol error rate (SER) performance of an OFDM based communication system.

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“…Please note that requirements listed in[5] and[74] are in terms of spectrum sensing capabilities of the testbed, in this section we highlight some of the general requirements of a cognitive radio testbed. Some of the important points have been taken from[5] and[74].…”

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Design and measurement results for cooperative spectrum sharing

Vivek

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Testbeds and Implementation Issues

Katzis

Perotti²,

Nardis

2014

Cognitive Communication and Cooperative HetNet Coexistence

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A Cognitive Radio (CR) system can be visualized as a complicated wireless communication system that involves a virtual engine (soul) and a platform (body). The engine is implemented based on a number of logical arguments in order to reason and negotiate with other wireless systems, aiming towards the optimum utilization of the spectrum while ensuring minimum disruption to existing wireless systems. This chapter focuses on the implementation of the cognitive engine in real world testbeds by reviewing existing testbeds and identifying their key features

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Challenges Implementing Internet of Things (IoT) Using Cognitive Radio Capabilities in 5G Mobile Networks

Katzis

Ahmadi

2016

Modeling and Optimization in Science and Technologies

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Cognitive radio platforms and testbeds

Cited by 3 publications

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Design and measurement results for cooperative spectrum sharing

Design and measurement results for cooperative spectrum sharing

Testbeds and Implementation Issues

Challenges Implementing Internet of Things (IoT) Using Cognitive Radio Capabilities in 5G Mobile Networks

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