LTE PHY Layer Engineering - Tutorial from IS-Wireless

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Mr. Marcin Dryjanski, Sr. Engineer of IS-Wireless, delivered a tutorial entitled: LTE PHY Layer Engineering, during the SDR’12 WInnComm conference in Brussels, on the 29th of June 2012. …

Mr. Marcin Dryjanski, Sr. Engineer of IS-Wireless, delivered a tutorial entitled: LTE PHY Layer Engineering, during the SDR’12 WInnComm conference in Brussels, on the 29th of June 2012.

Within this presentation, you will find information about: evolution path of the 3GPP Systems Standardization, LTE Feature's roadmap, LTE basic radio access techniques, LTE Radio Interface, and what is more LTE simulation cases based on LTE PHY Lab, which is part of IS-Wireless flagship product, called LTE LAB. More information about LTE LAB can be found at: http://is-wireless.com/products/lte-lab

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  • 1. LTE PHY Layer Engineering Marcin Dryjański IS-Wireless
  • 2. LTE Introduction Evolution Path of the 3GPP Systems Standardization 1992 1997 2000 2005 2009 2011 GSM GPRS UMTS HSPA LTE LTE-Advanced 2G 2.5G 3G 3.5G 3.9G 4G Rel. 96 Rel. 5 Phase 1 Rel. 99 Rel. 8 3GPP Rel. 97 Rel. 6 Rel. 10 Phase 2 Rel. 4 Rel. 9 Release Rel. 98 Rel. 7 UL: 128kbps UL: 11Mbps UL: 75Mbps UL: 500Mbps Highest Voice only 14.4kbps DL: 384kbps DL: 28Mbps DL: 325Mbps DL: 1Gbps Data RateCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 3. LTE Towards 4G Features’ Roadmap 2008 2009 2010 2011 2012 MIMO Standardization Commercial deployment TF Scheduling Specs Freezing LTE Rel. 8 December 2008 OFDMA/SCFDMA HARQ Reduced architecture Adaptive-MCS Specs Freezing December 2009 LTE Rel. 9 MBMS based on SFN SON Location Services LTE-Advanced Carrier Agregation (wider BW) Specs Freezing March 2011 LTE Rel. 10 Relaying Extended DL MIMO (8x8) UL MIMO (4x4) Enhanced Home eNB & HetNet Specs freezing target december 2012 LTE Rel. 11 Coordinated Multipoint Tx/Rx MTC (M2M Communications) eICIC and RelaysCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 4. LTE Introduction LTE Basic Radio Access Techniques Summary E-UTRA Rel. 8/9 Downlink E-UTRA Rel. 8/9 Uplink OFDMA OFDMA SC-FDMA SC-FDMA eNB eNB DL Radio Interface Features UL Radio Interface Features • OFDMA Scheme • Adaptive modulation: QPSK, 16QAM, 64QAM • SCFDMA Scheme • MIMO (2x2, 4x4, SISO, TxDiversity, SU-MIMO) • Adaptive modulation: QPSK, 16QAM, 64QAM (opt) • System BW: 1.4, 3, 5, 10, 15, 20 MHz • System BW: 1.4, 3, 5, 10, 15, 20 MHz • HARQ and QoS support • HARQ and QoS supportCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 5. Fundamentals of E-UTRA Why Multicarrier? h(t) max t Significant ISI f H(f) Single carrier Frequency selective fading Time-domain equalization -> prohibitively complex t f 4 symbols of length T in series over time 4T Short QPSK/QAM Symbol f H(f) Lower ISI 4 sub carriers Frequency flat fading Frequency-domain equalization -> simple and elegant t 4 symbols of length 4T in paralell over time 4T f Long QPSK/QAM SymbolCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 6. LTE Radio Interface FDD Downlink Radio Frame 1 Radio Frame (10 ms) PBCH – 4 OFDM symbols (0-3) PDSCH – rest REs 1 subframe (1 ms) 1 slot (0.5 ms) in slot 1 in subframe 0 OFDM Symbol 7 OFDM Symbols 2 PRB 12 SC 72 62BW SCs SCs DC RE RS OFDM Subcarrier Guard Band for P-SS and S-SS Control Region: First 1-3 OFDM Symbols in subframe Synchronization Signal: PCFICH – OFDM symbol 0, 2 OFDM symbols (5-6) in slot 0 and 10 PHICH – OFDM symbol 0 P-SS – OFDM symbol 6 in slot 0 and 10 PDCCH – the rest S-SS – OFDM symbol 5 in slot 0 and 10Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 7. TMLTE PHY Lab
  • 8. Reasons For System Modelling For Various Players in the Value ChainCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 9. LTE PHY LabTM E-UTRA PHY Layer Model Comprehensive implementation of the 3GPP Rel 8 E-UTRA PHY Main features of the LTE PHY LabTM: • Implemented according to 3GPP Specifications LTE PHY LabTM can be used to model Downlink • Downlink & Uplink link-level behavior of LTE system: • Single TX - single RX • fading & AWGN • FDD and TDD versions • FEC performance • Evaluates each individual bit • modulation Uplink • All LTE MIMO Schemes • synchronization & channel estimation eNB • Support for all LTE BWs • performance measures: thrpt vs SNIR General Block Diagram of LTE PHY LabTM DOWNLINK 101010111001… 101010111001… eNB Multipath UE MAC Layer MAC Layer PHY TX Channel PHY RX UPLINK 101010111001… 101010111001… eNB Multipath UE MAC Layer MAC Layer PHY RX Channel PHY TXCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 10. LTE PHY LabTM DL: eNB TransmitterCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 11. TMLTE PHY Lab Printscreens
  • 12. LTE PHY Lab OFDMA Signal 3PRB CPCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 13. LTE PHY Lab DL Subframe 0 – PSD (FDD)Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 14. LTE PHY Lab DL Radio Frame (FDD) with 2 users Guardband Guardband 2PRB Subframe DC Symbol Subcarrier User 1 Data User 2 DataCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 15. LTE PHY LabRadio Frame With One User Data (T/F Side)Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 16. LTE PHY LabReceiver Offsets (Carrier Frequency Offset) Received Signal Transmitted SignalCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 17. LTE PHY Lab Carrier Aggregation and MIMOCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  • 18. Contact details Email: info@is-wireless.com www.is-wireless.comCopyright by IS-Wireless. All rights reserved. www.is-wireless.com