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TR 25.892
Feasibility study for
Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement

3GPP‑Page
V6.0.0 (Wzip)  2004/06  91 p.
Rapporteur:
Mrs. Boumendil, Sarah

full Table of Contents for  TR 25.892  Word version:  6.0.0

1Scope  p. 7
2References  p. 7
3Definitions, symbols and abbreviations  p. 8
3.1Definitions  p. 8
3.2Symbols  p. 8
3.3Abbreviations  p. 9
4OFDM Technology  p. 9
4.1OFDM Fundamentals  p. 9
4.1.1OFDM Definition  p. 9
4.1.2Conceptual OFDM Signal Generation  p. 10
4.1.3Practical OFDM Signal Generation Using IFFT Processing  p. 11
4.1.4Guard Interval  p. 11
4.1.5Impact of Guard Interval  p. 12
4.1.6Impact of Symbol Duration  p. 12
4.1.7Impact of Inter-Carrier Spacing  p. 13
4.1.8OFDM Inactive Sub-Carriers  p. 13
4.1.9Time-Frequency Multiplexing  p. 14
4.1.10OFDM Signal Reception Using the FFT  p. 15
4.2OFDM/IOTA Fundamentals  p. 15
4.2.1OFDM/OQAM Principles  p. 15
4.2.2IOTA filter  p. 16
4.2.3OFDM/ IOTA parameters  p. 17
4.3OFDM for Mobile Systems  p. 18
5OFDM performance analysis  p. 18
5.1Reference System Scenario for High Speed Data Services Capacity Evaluation  p. 18
5.1.1OFDM Downlink  p. 18
5.1.2Equivalent WCDMA Scenario  p. 19
5.2Reference OFDM configuration for the evaluation  p. 20
5.3Performance Analysis Results  p. 20
6OFDM feasibility  p. 20
6.1Spectrum compatibility  p. 20
6.1.1UMTS Spectrum Emission Mask  p. 21
6.1.2Comparison with WCDMA Carriers  p. 23
6.2Physical Layer Structure in the DL  p. 24
6.2.1Physical Channels  p. 24
6.2.1.1OFDM Physical Channel Definition  p. 25
6.2.2Channel Coding and Multiplexing  p. 26
6.2.3Physical channel mapping  p. 27
6.2.4User Traffic Multiplexing Solutions  p. 27
6.2.4.1Solution based on a generic Costas sequence  p. 27
6.2.5Mapping of Rel 5 HS-DSCH Signalling onto the OFDM HS-DSCH Signalling  p. 28
6.2.5.1Considerations on the Design of OFDM Pilot Channel (OFDM-CPICH)  p. 29
6.2.5.2Considerations on the Design of OFDM Signalling Channels  p. 32
6.3Impacts on UL  p. 33
6.4Handover  p. 33
6.4.1Assumptions  p. 33
6.4.2Serving HS-DSCH cell change  p. 34
6.4.2.1Mobility between OFDM HS-DSCH serving cells  p. 34
6.4.2.2Mobility from an OFDM serving HS-DSCH cell to a WCDMA HS-DSCH serving cell  p. 35
6.4.2.3Mobility from a W-CDMA HS-DSCH serving cell to an OFDM serving cell  p. 35
6.4.3Impact on radio resource management in UTRAN  p. 35
6.5Synchronisation  p. 36
6.5.1UE Synchronization  p. 36
6.5.1.1Frequency synchronization and tracking  p. 36
6.5.1.2Time synchronization and tracking  p. 36
6.5.2Synchronization scenarios  p. 36
6.6Frequency re-use and Inter-cell Interference  p. 37
6.6.1Frequency Re-use  p. 37
6.6.2Inter-cell Interference  p. 37
6.7Analysis of User Equipment Complexity  p. 38
6.7.1OFDM UE Receiver Functionalities  p. 38
6.7.2RF Functionality  p. 38
6.7.3Cell Search and Measurements  p. 39
6.7.4Synchronisation  p. 39
6.7.5Data demodulation  p. 39
6.7.5.1Time-Domain-to-Frequency-Domain Translation (i.e. FFT) Complexity  p. 39
6.7.5.2Channel Estimation  p. 42
6.7.5.3Channel Equalization  p. 42
6.8Analysis of Node B impacts  p. 43
6.8.1OFDM Node B Transmitter Functionalities  p. 43
6.8.2Data Modulation  p. 43
6.8.2.1OFDM Physical Channel Mapping and Multiplexing  p. 43
6.8.2.2Frequency-Domain-to-Time-Domain Translation (i.e. IFFT)  p. 43
6.8.2.3Prefix Insertion and Time Windowing  p. 43
6.8.3RF Functionality  p. 44
6.8.3.1Digital-to-Analog Conversion and Up-Conversion  p. 44
6.8.3.2Amplification  p. 45
6.8.3.2.1Peak-to-Average Ratio (PAR)  p. 46
6.9Impact to L2 and L3 protocols  p. 47
6.9.1Protocol Model  p. 47
6.9.2RRC impacts  p. 47
6.9.3Iub/Iur impacts  p. 47
7Conclusion  p. 47
ASimulation Assumptions and Results  p. 49
A.1Link Simulation Assumptions  p. 49
A.1.1Link Level Simulation Assumptions for OFDM  p. 49
A.1.1.1Time Windowing  p. 50
A.1.2Link Level Simulation Assumptions for WCDMA  p. 51
A.1.3Link Level Simulation Scenarios  p. 52
A.2Link Simulation Results  p. 54
A.2.1Link-Level Performance with Realistic Performance Using EESM Modelling  p. 54
A.3System Simulation Assumptions  p. 56
A.3.1Antenna Pattern  p. 56
A.3.2Antenna Orientation  p. 56
A.3.3Common System Level Simulation Assumptions  p. 57
A.3.4Traffic Sources  p. 59
A.3.4.1HTTP Traffic Model Characteristics  p. 59
A.3.4.2FTP Traffic Model Characteristics  p. 60
A.3.4.3NRTV (Near Real Time Video) Traffic Model Characteristics  p. 61
A.3.5Performance Metrics  p. 62
A.3.5.1Output Metrics for Data Services  p. 62
A.3.6Channel Models and Interference  p. 64
A.3.6.1Channel Models  p. 64
A.4System-Level Evaluation Methodology  p. 64
A.4.1HSDPA release 5  p. 65
A.4.2HSDPA using OFDM modulation  p. 65
A.4.3Effective SIR Mapping Functions  p. 66
A.4.3.1Effective SIR Mapping Function for WCDMA  p. 66
A.4.3.1.1Effective SIR Mapping Function for WCDMA RAKE Receivers  p. 66
A.4.3.1.2Effective SIR Mapping Function for WCDMA MMSE Receivers  p. 67
A.4.3.1.3Effective SIR Mapping Function for WCDMA Receivers with Node B Impairments  p. 68
A.4.3.2Effective SIR Mapping Functions for OFDM  p. 68
A.4.3.2.1OFDM Exponential Effective SIR Mapping  p. 68
A.4.3.2.2Effective SIR Mapping Function for OFDM with Node B Impairments  p. 69
A.4.4System-Level HARQ Modelling  p. 69
A.4.4.1Chase-Combining HARQ Modelling for OFDM  p. 69
A.4.5Reference AWGN TTI BLER Curves for System-Level Simulations  p. 70
A.4.6Reference ? Values for the OFDM EESM Approach in System-Level Simulations  p. 73
A.4.6.1Reference ? Values Using a Random OFDM Subcarrier Interleaver  p. 73
A.5System Simulation Results  p. 74
A.5.1Reference Performance (White Interference, No Impairments)  p. 74
A.5.2Reference Performance (White Interference, Node B Impairments)  p. 80
A.6RF Aspects  p. 86
A.6.1W-CDMA Low Pass Filter: modelling and impact  p. 86
A.6.1.1LPF modelling  p. 86
A.6.1.2Simulation assumptions  p. 87
A.6.1.3LPF effect on multi-path fading channel  p. 89
BChange history  p. 91

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