Tag : ofdma

MULTICARRIER TECHNOLOGIES IN LTE

MULTICARRIER TECHNOLOGIES IN LTE

Adopting a multicarrier approach for multiple access in LTE was the first major design choice. The choice of multiple-access schemes was made in December 2005, with OFDMA being selected for the downlink, and SC-FDMA
UL Allocation (SC-FDMA) in LTE

UL Allocation (SC-FDMA) in LTE

SC-FDMA utilizes single carrier modulation, DFT-spread orthogonal frequency multiplexing, and frequency domain equalization. LTE uses OFDMA on the DL. It allocates DL bandwidth to the user based on resource blocks, rather than individual subcarriers.
LTE SC-FDMA and LTE Uplink

LTE SC-FDMA and LTE Uplink

Introduction to SC-FDMA and uplink frame structure Marriage of single carrier transmission and FDMA Uplink SC-FDMA tranmsit and receive chains Peak to Average Power Ratio (PAPR) comparison with SC-FDMA and OFDMA  
LTE OFDMA and Downlink Frame Structure Details

LTE OFDMA and Downlink Frame Structure Details

LTE OFDMA and Downlink Frame Structure Details Downlink OFDMA time-frequency multiplexing LTE Spectrum Flexibility and Bandwidth FDD downlink frame structure detailed TDD frame structure LTE (any OFDM/OFDMA) band is made up of multiple small
What is Cyclic prefix in LTE ?

What is Cyclic prefix in LTE ?

The guard period after each rectangular pulse carrying the modulated data symbol is a simple and efficient method to deal with multi-path reception. The cyclic prefix (CP) simply consists of the last part of
OFDM and SC-FDMA Fundamental

OFDM and SC-FDMA Fundamental

OFDM Fundamental OFDM was selected for the downlink because it can Improved spectral efficiency Reduce ISI effect by multipath Provide better Protection against frequency selective fading OFDM is a scheme that offers good resistance
Initial LTE Network Design Options

Initial LTE Network Design Options

While the goals and design targets specified above may be aggressive, options have been approved for consideration in the design that when used properly, will lead to a more efficient network compared to the