TD – LTE PHY Layer

Subject: 4G LTE
Category: Radio
Duration: 3 days

Course outline:

Introduction to E-UTRA TDD

● Evolution steps of the 3GPP systems, the goals for LTE
● E-UTRA and Evolved Packet Core network architecture
● Nodes: UE, eNB, SGW, MME and interfaces: Uu, X2, S1, S11
● Summary of the radio access techniques
● E-UTRAN protocol stack
● Channel bandwidths and RF limitations for FDD and TDD

Signal Processing for OFDMA, SC-FDMA and MIMO

● Fundamentals of multipath propagation (selectivity in time, frequency and space)
● OFDM transmission, orthogonality, subcarriers, separation between subcarriers
● Time-domain and frequency-domain representation of the OFDM signal
● Guard interval and Cyclic Prefix (CP) role
● Equalization for OFDM
● IDFT/DFT, IFFT/FFT
● Multiuser diversity and OFDMA
● SC-FDMA as a subclass of OFDMA, comparison between SC-FDMA and OFDMA
● Multiple antenna concept and related signal processing
● Open and closed loop spatial multiplexing
● Single-user and Multi-user MIMO

Signal Processing for the TDD Evolved Node B

● Architecture of the eNB transmitter and receiver including processing blocks and signals
● E-UTRA radio frame for FDD
● TDD Radio frame and special sub-frame configuration
● Coexistence with TD-SCDMA
● Downlink channel architecture
● eNB-originated signals and TDD PHY channels: RS, P-SS, S-SS, PBCH, PCFICH, PHICH, PDCCH, PDSCH
● TDD synchronization signal mapping
● 3GPP Rel. 8 MIMO processing with layer mapping, pre-coding and feedback

Signal Processing for the TDD User Equipment

● LTE UE categories
● Architecture of the UE transmitter and receiver including processing blocks and signals
● Uplink channel architecture
● UE-originated signals and TDD PHY channels: DRS, SRS, PUCCH, PUSCH, PRACH
● Evaluation of the eNB and UE Transceiver

Operation Under Various Conditions

● Impact of uncorrected multipath channels
● Peak-to-average-power-ratio and its influence on the transmitted signal
● Pulse shaping and filtering in the time domain and its influence on the transmitted signal
● Synchronization mismatches in the time and frequency domain and their influence on the received signal
● Influence of various types of interferers (single-dominant, non-single-dominant) on the received signal
● TDD DL and UL sub-frame mismatches

Radio Interface Procedures

● Various traffic allocations for the TDD downlink and uplink
● E-UTRA radio frame
● Synchronization and random access procedures
● Scheduling for FDD and TDD
● Hybrid ARQ operation for FDD and TDD; feedback consideration
● TDD HARQ bundling and multiplexing

Processing Improvements in E-UTRA 3GPP Rel. 9 and Rel. 10

● Usage of 8 antennas in the downlink for spatial multiplexing
● Transmit diversity in the uplink
● Spatial multiplexing in the uplink
● Coordinated MIMO
● Bandwidth aggregation

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