Customer Reviews

Essentials of Cognitive Radio (The Cambridge Wireless Essentials Series)

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For someone possibly not a radio engineer, Doyle writes a non-technical account of what cognitive radio means. Unlike many texts on radios, there is scarcely an equation here. What the book focuses on are the main problems in cooperative behaviour needed when there is a network of CR nodes.

She shows that numerous aspects remain unsolved, or at least without a consensus about a preferred implementation. The general problem is easy enough to understand. Where a spectral range assigned to a primary user might be de facto underutilised at several time ranges. Thus it would be nice if secondary users could sneak in and temporarily use an unoccupied spectral range, but then quickly cease when detecting that the primary user comes back on. All this is where the primary and secondary users transmit and receive in some mutally accessible geographic region; hence that interference can occur if the secondary users are not careful.

The prospects of more efficient spectral usage is the main motivator for CR. But my impression from the book is that the plethora of unresolved topics puts CR far off. Maybe an incremental approach could work. Where certain aspects, like smart antennas and MIMO get increasingly incorporated into new radios, and a full CR is deferred.