Chapter 8. Cognitive Techniques: Position Awareness
John Polson and Bruce A. Fette
General Dynamics C4 SystemsScottsdale, Arizona, and Rhome, Texas

8.1. Introduction

For cognitive radio (CR) to reach its full potential as an efficient member of a network or as an aid in users’ daily tasks, and even to conserve the precious spectrum resource, a radio must primarily know its position and what time it is. From position and time, a radio can (1) calculate the antenna-pointing angle that best connects to another member of the network; (2) place a transmit packet on the air so that it arrives at the receiver of another network member at precisely the proper timeslot to minimize interference with other users; or (3) guide its user in his or her daily tasks ...

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