Tren Griffin @trengriffin I work for Microsoft. Previously I was a partner at Eagle River, a private equity firm established by Craig McCaw. I am on the board of directors of Kymeta. Sep. 19, 2019 1 min read

When people asked me in the early 1990s for a primer on radio and "telephone networks" I would recommend this book by Calhoun, which is still quite expensive. I'm not sure what book I would recommend today. The world has changed a lot since then, but the laws of physics have not.

Calhoon starts with basics (e.g., a radio wave can be visualized as a sine wave; distance a wave travels to complete a cycle is the wavelength of the signal). What was interesting was translating that into the economics of deploying wireless to achieve optimal "capacity density".

Looking at the 1992 edition of Calhoun's book tonight reminds me of how even the most technically astute wireless experts didn't predict very well how and by how much capacity would be increased by approaches like spatial multiplexing. The outcome for CDMA surprised many people.

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