In this paper, the performance of an underlay multiple-input multiple-output (MIMO) cognitive radio system is analytically studied. In particular, the secondary transmitter operates in a spatial ...

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What's CODE SWITCH? It's the fearless conversations about race that you've been waiting for. Hosted by journalists of color, our podcast tackles the subject of race with empathy and humor. We ...

How to find the best cooling sheets. You can flip the pillow and kick off the covers, but if your sheets are trapping heat, there’s no escaping a sweaty night.