Modeling a 4G LTE System in MATLAB
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1 Modeling a 4G LTE System in MATLAB Part 2: Simulation acceleration Houman Zarrinkoub PhD. Signal Processing Product Manager MathWorks houmanz@mathworks.com 2011 The MathWorks, Inc. 1
2 Why simulation acceleration? From algorithm exploration to system design Size and complexity of models increases Time needed for a single simulation increases Number of test cases increases Test cases become larger Need to reduce simulation time during design Need to reduce time for large scale testing during prototyping and verification 2
3 MATLAB is quite fast Optimized and widely-used libraries BLAS: Basic Linear Algebra Subroutines (multithreaded) LAPACK: Linear Algebra Package JIT (Just In Time) Acceleration On-the-fly multithreaded code generation for increased speed Built-in support for vector and matrix operations Parallel computing support to utilize additional cores Parallel Computing Toolbox MATLAB Distributed Computing Server GPU support 3
4 Simulation acceleration options in MATLAB System Objects User s Code Parallel Computing >> Demo commacceleration MATLAB to C GPU processing 4
5 Parallel Simulation Runs Worker TOOLBOXES BLOCKSETS Worker Worker Worker Task 1 Task 2 Task 3 Task 4 >> Demo Time Time 5
6 Summary matlabpool available workers No modification of algorithm Use parfor loop instead of for loop Parallel computation or simulation leads to further acceleration More cores = more speed 6
7 Simulation acceleration options in MATLAB System Objects User s Code Parallel Computing MATLAB to C GPU processing 7
8 What is a Graphics Processing Unit (GPU) Originally for graphics acceleration, now also used for scientific calculations Massively parallel array of integer and floating point processors Typically hundreds of processors per card GPU cores complement CPU cores Dedicated high-speed memory 8
9 Why would you want to use a GPU? Speed up execution of computationally intensive simulations For example: Performance: A\b with Double Precision 9
10 Ease of Use Options for Targeting GPUs 1) Use GPU with MATLAB built-in functions 2) Execute MATLAB functions elementwise on the GPU 3) Create kernels from existing CUDA code and PTX files Greater Control 10
11 Data Transfer between MATLAB and GPU % Push data from CPU to GPU memory Agpu = gpuarray(a) % Bring results from GPU memory back to CPU B = gather(bgpu) 11
12 GPU Processing with Communications System Toolbox Alternative implementation for many System objects take advantage of GPU processing Use Parallel Computing Toolbox to execute many communications algorithms directly on the GPU GPU System objects comm.gpu.turbodecoder comm.gpu.viterbidecoder comm.gpu.ldpcdecoder comm.gpu.pskdemodulator comm.gpu.awgnchannel Easy-to-use syntax Dramatically accelerate simulations 12
13 Example: Turbo Coding Impressive coding gain High computational complexity Bit-error rate performance as a function of number of iterations = comm.turbodecoder( NumIterations, numiter, 13
14 Acceleration with GPU System objects Version Elapsed time Acceleration CPU 8 hours GPU 40 minutes 12.0 Same numerical results Cluster of 4 GPUs 11 minutes 43.0 = comm.turbodecoder( comm.gpu.turbodecoder( NumIterations, N, = comm.awgnchannel( = comm.gpu.awgnchannel( 14
15 Key Operations in Turbo Coding Function CPU GPU Version 1 % Turbo Encoder htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement hber = comm.errorrate; % Turbo Decoder htdec = comm.turbodecoder( 'TrellisStructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); % Turbo Encoder htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement hber = comm.errorrate; % Turbo Decoder htdec = comm.gpu.turbodecoder( 'TrellisStructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); ber = zeros(3,1); %initialize BER output %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) data = randn(blklength, 1)>0.5; % Encode random data bits yenc = step(htenc, data); %Modulate, Add noise to real bipolar data modout = 1-2*yEnc; rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors ber = step(hber, data, decdata); end ber = zeros(3,1); %initialize BER output %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) data = randn(blklength, 1)>0.5; % Encode random data bits yenc = step(htenc, data); %Modulate, Add noise to real bipolar data modout = 1-2*yEnc; rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors ber = step(hber, data, decdata); end 15
16 Profile results in Turbo Coding Function CPU GPU Version 1 % Turbo Encoder <0.01 htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise <0.01 hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement <0.01 hber = comm.errorrate; % Turbo Decoder <0.01 htdec = comm.turbodecoder( 'TrellisStructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); % Turbo Encoder <0.01 htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise <0.01 hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement <0.01 hber = comm.errorrate; % Turbo Decoder 0.02 htdec = comm.gpu.turbodecoder( 'TrellisStructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); <0.01 ber = zeros(3,1); %initialize BER output %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) 0.30 data = randn(blklength, 1)>0.5; % Encode random data bits 2.33 yenc = step(htenc, data); %Modulate, Add noise to real bipolar data 0.05 modout = 1-2*yEnc; 1.50 rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding 0.03 llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors 0.17 ber = step(hber, data, decdata); end <0.01 ber = zeros(3,1); %initialize BER output %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) 0.28 data = randn(blklength, 1)>0.5; % Encode random data bits 2.38 yenc = step(htenc, data); %Modulate, Add noise to real bipolar data 0.05 modout = 1-2*yEnc; 1.45 rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding 0.04 llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors 0.17 ber = step(hber, data, decdata); end 16
17 Key Operations in Turbo Coding Function CPU GPU Version 2 % Turbo Encoder htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement hber = comm.errorrate; % Turbo Decoder htdec = comm.turbodecoder('trellisstructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) data = randn(blklength, 1)>0.5; % Encode random data bits yenc = step(htenc, data); %Modulate, Add noise to real bipolar data modout = 1-2*yEnc; rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors ber = step(hber, data, decdata); end % Turbo Encoder htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise hawgn = comm.gpu.awgnchannel ('NoiseMethod', 'Variance'); % BER measurement hber = comm.errorrate; % Turbo Decoder - setup for Multi-frame or Multi-user processing numframes = 30; htdec = comm.gpu.turbodecoder('trellisstructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations',numiter, NumFrames,numFrames); %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) data = randn(numframes*blklength, 1)>0.5; % Encode random data bits yenc = gpuarray(multiframestep(htenc, data, numframes)); %Modulate, Add noise to real bipolar data modout = 1-2*yEnc; rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors ber=step(hber, data, gather(decdata)); end 17
18 Profile results in Turbo Coding Function CPU GPU Version 2 % Turbo Encoder <0.01 htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise <0.01 hawgn = comm.awgnchannel('noisemethod', 'Variance'); % BER measurement <0.01 hber = comm.errorrate; % Turbo Decoder <0.01 htdec = comm.turbodecoder( 'TrellisStructure',poly2trellis(4, [13 15], 13),... 'InterleaverIndices', intrlvrindices,'numiterations', numiter); %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) 0.30 data = randn(blklength, 1)>0.5; % Encode random data bits 2.33 yenc = step(htenc, data); %Modulate, Add noise to real bipolar data 0.05 modout = 1-2*yEnc; 1.50 rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding 0.03 llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors 0.17 ber = step(hber, data, decdata); end % Turbo Encoder <0.01 htenc = comm.turboencoder('trellisstructure',poly2trellis(4, [13 15], 13),.. 'InterleaverIndices', intrlvrindices) % AWG Noise 0.03 hawgn = comm.gpu.awgnchannel ('NoiseMethod', 'Variance'); % BER measurement <0.01 hber = comm.errorrate; % Turbo Decoder - setup for Multi-frame or Multi-user processing 0.01 numframes = 30; 0.01 htdec = comm.gpu.turbodecoder('trellisstructure', poly2trellis(4, [13 15], 13),'InterleaverIndices', intrlvrindices, 'NumIterations',numIter, NumFrames,numFrames); %% Processing loop while ( ber(1) < MaxNumErrs && ber(2) < MaxNumBits) 0.22 data = randn(numframes*blklength, 1)>0.5; % Encode random data bits 2.45 yenc = gpuarray(multiframestep(htenc, data, numframes)); %Modulate, Add noise to real bipolar data 0.02 modout = 1-2*yEnc; 0.31 rdata = step(hawgn, modout); % Convert to log-likelihood ratios for decoding 0.01 llrdata = (-2/noiseVar).*rData; % Turbo Decode decdata = step(htdec, llrdata); % Calculate errors 0.09 ber=step(hber, data, gather(decdata)); end 18
19 Things to note when targeting GPU Minimize data transfer between CPU and GPU. Using GPU only makes sense if data size is large. Some functions in MATLAB are optimized and can be faster than the GPU equivalent (eg. FFT). Use arrayfun to explicitly specify elementwise operations. 19
20 Acceleration Strategies Applied in MATLAB Option 1. Best Practices in Programming Vectorization & pre-allocation Environment tools. (i.e. Profiler, Code Analyzer) 2. Better Algorithms Ideal environment for algorithm exploration Rich set of functionality (e.g. System objects) 3. More Processors or Cores High level parallel constructs (e.g. parfor, matlabpool) Utilize cluster, clouds, and grids 4. Refactoring the Implementation Compiled code (MEX) GPUs, FPGA-in-the-Loop Technology / Product MATLAB, Toolboxes, System Toolboxes MATLAB, Toolboxes, System Toolboxes Parallel Computing Toolbox, MATLAB Distributed Computing Server MATLAB, MATLAB Coder, Parallel Computing Toolbox 20
21 Summary MATLAB is the ideal language for LTE modeling and simulation Communications System Toolbox extend breadth of MATLAB modeling tools You can accelerate simulation with a variety of options in MATLAB Parallel computing, GPU processing, MATLAB to C Address implementation workflow gaps with Automatic MATLAB to C/C++ and HDL code generation Hardware-in-the-loop verification 21
22 Call to Action Attend the 3rd part of this seminar Direct path from system model to implementation C and HDL code generation Fixed-point modeling Radio-in-the-loop with USRP2 22
23 Thank You Q & A 23
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