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The authors make use of the deterministic high-SNR approximation of the Gaussian cognitive radio channel to gain insights in deriving inner and outer bounds for any SNR. They show that the derived bounds are at most 1.87 bits apart for any SNR. Advancements in wireless technology have enabled the cooperation among devices, ensuring faster and more reliable communication. With smart and well-interconnected wireless transmitters, collaboration among entities is a relevant topic for modern communication systems. A well known and studied channel model inspired by the newfound abilities of cognitive radio technology and its potential impact on spectral efficiency in wireless networks is the cognitive radio channel.
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