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A phase shift oscillator is an electronic oscillator circuit which produces sine wave output.In RC phase shift oscillator 180 degree phase shift is generated by the RC network and another 180 degree is generated by the op-amp,so the resulting wave is inverted by 360 degree.

Multisim simulation of Hartley oscillator using Op-amp.

A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency.

LTE radio interface is designed based on a layered protocol stack,which can be divided into control plane and user plane protocol stacks.

Overview of the LTE radio interface ,Design Principles of LTE,Network Architecture