Efficient Design Approaches for MIMO/Cooperative Cognitive Radio Transceivers

当前频谱分配政策的僵化结构为快速增长的无线用户造成了瓶颈。另一方面，联邦通信委员会（FCC）的测量结果表明，大多数许可频带或者未被使用，或者被利用的时间少于10%。为了解决对频谱使用的限制，FCC已经促使使用机会性频谱共享来使得未许可无线用户可访问许可频带。这背后的意图是创建用于并发频谱使用的无线设备的认知能力。在认知网络中，用户/无线电通过学习或人工智能动态地适应他们的环境，目的是提高网络的整体性能。

The rigid structure of the current spectrum allocation policies creates a bottleneck for rapidly growing wireless users. On the other hand, the Federal Communication Commission (FCC) measurements reveal that most of the licensed frequency bands are either unused or utilized less than 10% of the time. In order to address the limitations on spectrum usage, the FCC has motivated the use of opportunistic spectrum sharing to make licensed frequency bands accessible for unlicensed wireless users. The intention behind this is to create cognitive capability of wireless devices for concurrent spectrum usage. In cognitive networks, users/radios dynamically adapt to their environment through learning or artificial intelligence with the aim of improving the overall network performance.