Cooper's Law

Much like Moore's Law deals with the growth curve of transistors and integrated circuits, Cooper's Law, named after Martin Cooper, discusses the performance curve wireless communications.  Specifically, the capacity of usable spectrum doubles every two and a half years.

However, there are indications what new mobile technologies (LTE) are approaching the Shannon limit (pdf link, page 10, section 4.3).

What happens when that limit is reached: smaller cells and more spectrum are needed to meet the demand.

Wireless with lights

There are a couple of initiatives to provide local wireless data connectivity with lighting.  Here is one example.