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Which among the following is a traditional method employed for effective use of spectrum?

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Which among the following is a traditional method employed for effective use of spectrum?

(a) Minimization of nodes per second

(b) Maximization of nodes per second

(c) Maximization of bits per Hz

(d) Minimization of bits per Hz

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This key question is from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

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Correct choice is (c) Maximization of bits per Hz

Explanation: Spectrum efficiency metrics of traditional digital communication is simple as it involves measuring only the number of bits per Hz. When the number of bits per Hz is maximized, a minimal amount of spectrum is occupied. However defining spectrum metrics for cognitive radio is difficult as it includes the area of propagation in addition to the amount of spectrum.

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