LTE Fundamentals学习资料.pptVIP

2010-05-25 LTE Fundamentals Tutorial LTE FUNDAMENTALS SVEN-ANDERS STURESSON Introduction Why learn about LTE FUNDAMENTALS 20 minutes ! LTE today – Rel 8 LTE tomorrow – Rel 10 Scope and objectives Explain the basics of the LTE radio interface Give an overview of the evolution of LTE Overview Key LTE radio access features LTE Radio Access – DownlinkOFDM - Orthogonal Frequency Division Multiplexing Large number of 15 kHz sub carriers Orthogonal: Other carriers zero at sampling point LTE Radio Access – UplinkSC-FDMA – Single Carrier FDMA (DFTS-OFDM) Pre-coded OFDM Similar to OFDM 15 kHz tones BUT consecutive Same time-domain structure Low Peak-to-Average Power Ratio LTE DL Physical Resources Scheduling Time domain Round-robin Max C/I Proportional fair Frequency domain Consecutive Random Measurement based Link adaptationLayer 1 feature Time Domain (/user) Modulation scheme Channel coding Frequency Domain (/SB) Not that common Time dispersion Cyclic prefix insertion Multi-antenna TransmissionExamples Spectrum Flexibility New and existing bands FDD and TDD Flexible bandwidth LTE DL peak rate20 MHz and 4x4 MIMO AND 64 QAM LTE in the Future – Evolution! LTE Advanced study in 3GPP Start March 2008 Expected Release 10 (2011) LTE Advanced = LTE 3GPP Rel 10 Major enhancements Higher peak rates Relaying solutions LTE 3GPP Rel 10Higher peak rates Carrier aggregation Spectrum aggregation DL/UL Multi-Antenna transmission 1.2Gbps demonstrated at MWC2010 4 x 20 MHz DL 4x4 MIMO Commercial hardware Summary LTE FUNDAMENTALS LTE radio access Advanced antenna solutions Spectrum flexibility LTE in 3GPP Release 10 HOW TO LEARN MORE LTE in Product catalog Training courses LTE/EPC Competence Space LTE/EPC Business Tutorials MWC2010 in PCAT We will start on a high level by looking at the key radio access features of LTE. The radio access is based on OFDM Radio technology In the downlink plain or conventional OFDM (Orthogonal Frequency Division Mul