Abstract—LTE-Advanced (Release 10) is a preliminary mobile
communication standard formally submitted as a candidate 4G
systems to the ITU-T. It is being standardized by the 3rd
Generation Partnership Project (3GPP) as a major enhancement
of the 3GPP Long Term Evolution (LTE-Release 8) standard,
which proved to be sufficient to satisfy market’s demand. The
3GPP group has been working on different aspects to improve
LTE performance, where the purpose of the framework provided
by LTE-Advanced, includes higher order MIMO, carrier
aggregation (carriers with multiple components), and
heterogeneous networks (relays, picos). This paper presents a
study on evolution LTE toward LTE-Advanced in terms of LTE
enabling technologies (Orthogonal Frequency Division
Multiplexing (OFDM) and Multiple-Input Multiple-Output
(MIMO)). This paper also focuses on LTE-Advanced
technologies MIMO enhancements for LTE-Advanced,
Coordinated Multi Point transmission (CoMP), repeaters and
relays.