Abstract
This chapter presents an overview of the techniques used in a multiple-antenna 1 system and discusses the key issues in introducing cognitive radio (CR) technology. This discussion is followed by an explanation of the applications of the new system, which combines CR and multiple-antenna (MA) techniques. This chapter discusses the issues that combine the MA system with CR technology to increase the utilization of spectrum by sharing the spectrum among different systems as well as to improve the transmission efficiency by selecting the optimum transmission schemes under certain operational environments. It introduces the new functionalities, namely, radio environment observation and cognitive engine, in the MA system by adding cognitive capability. In such a system, besides signal detection and identification, the DOA and antenna correlation information should be obtained with the help of multiple antennas. By combining the environmental information, CE is able to select an optimum operation mode for the radio, depending on the related position between the primary units (PUs) and secondary units (SUs).
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