thomas
087dc65d9a
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4241 818b1a75-f10b-46b9-bf7c-635c3b92a50f
108 lines
3.5 KiB
Matlab
108 lines
3.5 KiB
Matlab
function [ simparms ] = InitSimparms( mcs, n_frames, SNRdB )
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%INITSIMPARMS initialize simparms struct for TM5
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% There are always 2 user schedules for transmission
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% INPUT:
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% nb_antennas_tx = Number of transmit antennas, max = 2
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% nb_antennas_rx = Number of receive antennas per UE, max = 2
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% MCS(2) = Modulation and Coding Scheme [1,...,27]
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% n_frames = Number of frames to simulate
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% SNRdB = SNR in dB
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addpath('../../../PHY/LTE_TRANSPORT/mexfiles');
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j = sqrt(-1);
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%% Custom parameters
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simparms.nb_antennas_tx = 2;
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simparms.nb_antennas_tx_eNB = simparms.nb_antennas_tx;
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simparms.nb_antennas_rx = 2;
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simparms.n_frames = n_frames;
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simparms.snr_db = SNRdB;
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%% Constant parameters
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simparms.NB_ANTENNAS_TX = 2; % max number of TX antennas
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simparms.NB_ANTENNAS_RX = 2; % max number of RX antennas
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simparms.snr = 10.^(SNRdB/10);
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simparms.num_pdcch_symbols = 3;
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simparms.subframe = 7;
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simparms.abstraction_flag = 0;
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simparms.nb_rb = 25; % fixed number of RB per OFDM symbol
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simparms.rb_alloc = hex2dec('1FFF'); % 25 RBs
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simparms.MAX_TURBO_ITERATIONS = 5;
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simparms.nb_re = 3000; % there are 3000 REs in subframe 7
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simparms.frame_type = 1; % TDD frame
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simparms.mode1_flag = 0; % no is TM1 active
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simparms.Ncp = 0; % Normal CP
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simparms.ofdm_symbol_size = 512;
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simparms.log2_maxh = 16;
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simparms.dl_power_offset= 1; % no 3dB power offset
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simparms.nb_slots = 14;
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simparms.nb_re_per_symbol = simparms.nb_rb*12;
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simparms.nb_re_per_frame = simparms.nb_slots*simparms.nb_re_per_symbol;
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simparms.frame_errors = zeros(length(simparms.snr),simparms.NB_ANTENNAS_RX);
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simparms.CB = [[1;1],[1;-1],[1;j],[1;-j]]/sqrt(2); % codebook
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simparms.tseeds = set_taus_seed(1); % taus seeds
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% Turbo decoder: set the pointer to the td tables allocated by init_td()
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simparms.ptr_td = dlsch_decoding_init();
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% Init codewords
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% simparms.codeword(1) = InitCodeword(simparms,mcs(1));
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% simparms.codeword(2) = InitCodeword(simparms,mcs(2));
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simparms.codeword(1) = InitCodeword(simparms,mcs(1));
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simparms.codeword(2) = InitCodeword(simparms,mcs(2));
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% simparms.codeword(3) = InitCodeword(simparms,mcs(1));
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% simparms.codeword(4) = InitCodeword(simparms,mcs(1));
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end
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function codeword = InitCodeword(simparms,mcs)
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% Constellation
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j = sqrt(-1);
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amp = 1/32;
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Q4 = amp*[ 1+j, 1- j, -1+j, -1-j]./sqrt(2);
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Q16 = amp*[ 1+j, 1+3*j, 3+j, 3+3*j, 1-j, 1-3*j, 3-j, 3-3*j,...
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-1+j, -1+3*j, -3+j, -3+3*j, -1-j, -1-3*j, -3-j, -3-3*j]./sqrt(10);
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Q64 = amp*[ 3+3*j, 3+j, 1+3*j, 1+ j, 3+5*j, 3+7*j, 1+5*j, 1+7*j,...
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5+3*j, 5+j, 7+ j, 7+3*j, 5+5*j, 5+7*j, 7+5*j, 7+7*j,...
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3-3*j, 3-j, 1-3*j, 1- j, 3-5*j, 3-7*j, 1-5*j, 1-7*j,...
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5-3*j, 5-j, 7-3*j, 7- j, 5-5*j, 5-7*j, 7-5*j, 7-7*j,...
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-3+3*j,-3+j,-1+3*j,-1+ j,-3+5*j,-3+7*j,-1+5*j,-1+7*j,...
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-5+3*j,-5+j,-7+3*j,-7+ j,-5+5*j,-5+7*j,-7+5*j,-7+7*j,...
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-3-3*j,-3-j,-1-3*j,-1- j,-3-5*j,-3-7*j,-1-5*j,-1-7*j,...
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-5-3*j,-5-j,-7-3*j,-7- j,-5-5*j,-5-7*j,-7-5*j,-7-7*j]./sqrt(42);
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if (mcs <= 9)
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codeword.mod_order = 2;
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codeword.base2 = [2 1];
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codeword.const = Q4;
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elseif (mcs <= 16)
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codeword.mod_order = 4;
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codeword.base2 = [8 4 2 1];
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codeword.const = Q16;
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elseif (mcs <= 27)
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codeword.mod_order = 6;
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codeword.base2 = [32 16 8 4 2 1];
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codeword.const = Q64;
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else
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error('invalid MCS: %d\n', mcs);
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end
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codeword.mcs = mcs;
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codeword.G = simparms.nb_re*codeword.mod_order; % Number of softbits
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codeword.TBS = get_tbs(mcs,simparms.nb_rb);
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codeword.Kmimo = 2;
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codeword.harq_pid = 0; % First HARQ round
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codeword.Mdlharq = 1; % Number of HARQ rounds
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codeword.rvidx = 0;
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codeword.Nl = 1;
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codeword.Ndi = 1;
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end
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