The essential aspects of LTE's PHY (Part 1)

What is physical layer?
The Physical Layer is the first level in the seven-layer OSI model of computer networking. It translates communications requests from the Data Link Layer into hardware-specific operations to effect transmission or reception of electronic signals. The implementation of this layer is often termed PHY.

What is LTE?
Long Term Evolution is a project to improve the UMTS mobile phone standard to cope with future technology evolutions. Goals include improving spectral efficiency, lowering costs, improving services, making use of new spectrum and refarmed spectrum opportunities, and better integration with other open standards. It is sometimes called "4G."