Enabling Technologies for IMT‐Advanced Networks
Abd‐Elhamid M. Taha, Hossam S. Hassanein, Najah A. Abu Ali · 2011
This chapter reviews the recent advances at the access level that is used by the IMT-Advanced networks. It discusses the fundamentals of multicarrier digital modulation. In particular, the chapter discusses orthogonal frequency division multiplexing (OFDM) and two multiple access versions of it, namely orthogonal frequency division multiple access (OFDMA) and single-carrier frequency division multiple access (SC-FDMA). It then describes multiuser diversity and scheduling. Adaptive Coding and Modulation (ACM) and how it enables a channel-dependent transmission process are also discussed. The chapter then addresses the concept of frequency reuse (FR) and its different scenarios. Enabling wideband transmissions using carrier aggregation is studied, followed by a review of multiple input multiple output (MIMO) techniques. Relaying and the use of femtocells and the novel Coordinated Multi-point (CoMP) techniques are then described. Finally, the chapter focuses on the widely used power management techniques and inter-technology handovers. Controlled Vocabulary Terms 3G mobile communication; femtocells; frequency division multiplexing; MIMO