Cooperation: Brno University of Technology. 5G Simulator: FBMC. Ronald Nissel

Transcription

1 Cooperation: Brno University of Technology 5G Simulator: FBMC Ronald Nissel The 5G Simulator is under development, expected release date is Our FBMC Matlab code, however, can be downloaded at: and corresponds to our published papers

2 Matlab functions and classes LTE Simulator Main Simulation Files LTE_load_parameters LTE_sim_main Seite 2

3 Matlab functions and classes should have a simple input output relation Signal constellation class 5G Simulator Design Paradigm Main Simulation Files Single-user BER Single-user throughput FBMC class Multi-user throughput Turbo coder class Seite 3

4 Currently Implemented Classes Modulation: FBMC OFDM Signal Constellation (QAM, PAM) Coding TurboCoding Channel Estimation ImaginaryInterferenceCancellationAtPilotPosition PilotSymbolAidedChannelEstimation Seite 4

5 Turbo Coding Class TurboCoding = Coding.TurboCoding(... % Class constructor 2700,... % Number of coded bits % Number of data bits ); CodedBits = TurboCoding.TurboEncoder(DataBits); % Code binary stream EstimatedDataBits = TurboCoding.TurboDecoder(LLR); % Decode bits To DO: Rewrite class Currently, the Communications System Toolbox is used for the turbo coder Slow Not included in all MATLAB versions Seite 5

6 FBMC Class FBMC = Modulation.FBMC(... % Class constructor 90,... % Number of subcarriers 30,... % Number of FBMC symbols 15e3,... % Subcarrier spacing 15e3*90,... % Sampling frequency 0,... % Intermediate frequency false,... % Transmit real valued signal 'Hermite-OQAM',... % Prototype filter and OQAM or QAM 8,... % Overlapping factor 0,... % Initial phase shift true... % Polyphase implementation ); s = FBMC.Modulation(x); % Modulate data stream y = FBMC.Demodulation(s); % Demodulate received signal Some additional methods (small subset): FBMC.PlotTransmitPower(R_x); % Plot average transmit power over FBMC.PlotPowerSpectralDensity; % Plot the power spectral density Seite 6

7 FBMC.PlotTransmitPower Throughput: infinitely many transmission blocks assumed! Auxiliary Pilots OFDM: FBMC: K Number of FBMC symbols T Time spacing O Overlapping factor L Number of Subcarriers Seite 7

8 Overlapping Factor 8 Average transmit signal in db PHYDYAS Root-raised-cosine Hermite Seite 8

9 Power spectral density Overlapping Factor 8 PHYDYAS RRC Hermite Seite 9

10 Power spectral density Overlapping Factor 4 PHYDYAS RRC Hermite Seite 10

11 Signal-to-Interference Ratio Overlapping Factor PHYDYAS RRC Hermite Seite 11

12 1.4MHz LTE Doubly-flat Rayleigh fading FBMC vs. OFDM OFDM FBMC Number of subcarriers Number of time symbols (real) (equivalent to 15 complex symbols) Seite 12

13 FBMC 8-PAM BICM Capacity 4-PAM BICM Capacity 2-PAM BICM Capacity Seite 13

14 FBMC 8-PAM BICM Capacity Achievable Ergodic Capacity Achievable BICM Capacity 4-PAM BICM Capacity 2-PAM BICM Capacity Seite 14

15 FBMC Achievable Ergodic Capacity Achievable BICM Capacity Simulated Throughput Seite 15

16 OFDM Achievable Ergodic Capacity Achievable BICM Capacity Simulated Throughput Seite 16

17 Simulated Throughput: FBMC vs OFDM FBMC OFDM Seite 17

18 FBMC vs OFDM Achievable Ergodic Capacity Achievable BICM Capacity Simulated Throughput Seite 18

19 Doubly-flat Rayleigh fading Channel Estimation Cancel imaginary interference at pilot position Auxiliary pilot symbols Coding Channel estimation (interpolation) Linear MMSE LLR assumes perfect channel knowledge Seite 19

20 1 Auxiliary Symbol per Pilot Power offset 4.3, High PAPR Seite 20

21 Power offset Auxiliary Symbol per Pilot Seite 21

22 Power offset 0 Coding Seite 22

23 FBMC throughput FBMC: MMSE vs Linear for Coding Simulated throughput MMSE channel estimation Simulated throughput Linear channel estimation Achievable BICM Capacity (perfect CSI) Seite 23

24 FBMC vs OFDM for MMSE Channel Estimation BICM Capacity (perfect CSI) Coding 2 Auxiliary pilots 1 Auxiliary pilot Seite 24

25 FBMC vs OFDM for MMSE Channel Estimation Throughput simulations Coding 2 Auxiliary pilots 1 Auxiliary pilot Seite 25

26 FBMC vs OFDM for Linear Channel Estimation Throughput simulations Coding 2 Auxiliary pilots 1 Auxiliary pilot Seite 26

27 Recent Results Measurements Seite 27

28 Recent Results Measurements Interference from the LTE Uplink Use only these measurement points (just for testing) Seite 28

29 Recent Results Measurements FBMC and OFDM perform similar (as theory suggest) 64QAM, 8PAM 16QAM, 4PAM 4QAM, 2PAM Seite 29

30 Outlook Throughput measurements for 2,3,4 auxiliary pilot symbols, submit to SAM 2016 in Rio de Janeiro Performance of FBMC in doubly-selective channels Signal to interference ratio Effects on channel estimation (Massive) MIMO in FBMC Seite 30