Chapter 16. Cognitive Radio in Multiple-Antenna Systems
Jae Moung Kim, Sung Hwan Sohn and Ning Han
INHA University, Incheon, Korea
Seungwon Choi, Chiyoung Ahn, Gyeonghua Hong and Yusuk Yun
Hanyang University, Seoul, Korea

16.1. Introduction

Since first proposed by Dr. Joseph Mitola in his dissertation, cognitive radio (CR) technology has drawn attention in the research community as a means for secondary systems to share frequency bands with primary systems. We expect that its implementation will become more common in the wireless systems of the future, as spectrum sharing can be better achieved by implementing a CR approach in multiple-antenna systems to increase spectrum efficiency.
Multiple-antenna techniques such as beamforming and spatial-domain ...

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