两用户NOMA_OFDM_noma_ofdm_

clc; close all; clear all; %% 参数 order_psk = [2,4,8,16,64]; % PSK符号阶数，2表示BPSK，4表示4PSK，以此类推 for order = 1:length(order_psk) %for循环 sym_total = 2.048e4*52; % 总符号数 len_turbo = 1280; % Turbo码长 bit_total = sym_total * log2(order_psk(order));%总比特数等于总符号数乘以符号阶数 N_ofdma_u1 = 26; % OFDMA用户1的子载波数 N_ofdma_u2 = 26; % OFDMA用户2的子载波数 p1 = 0.6; % NOMA用户1的功率 p2 = 0.4; % NOMA用户2的功率 N_ofdm = 64; % OFDM子载波数 N_data = 52; % 有效数据载波数 N_GB = [4;3]; % 载波间隔参数 N_P = [12; 26; 40; 54]; % 导频参数 间隔为14 不携带信息，双方已知数据，用于信道估计，对参考相位进行跟综，不产生相位偏移 CP = 1/4; % CP占比 Ts = 1/10000; FD = 500; % 瑞利信道参数 SNR = 25:1:60; % 信噪比 %% 参数合理性判断 if (mod(bit_total, len_turbo)~=0)%求余函数 如果错误的话，则返回指定的数，否则返回公式结果 error('总比特数必须是Turbo编码长度的整数倍'); end if (mod((3*len_turbo+12)*bit_total/len_turbo, N_data)~=0) error('总比特数必须保证OFDM符号完整'); end if (N_ofdma_u1+N_ofdma_u2~=N_data) error('OFDMA中两用户的子载波数目之和必须等于数据载波总数'); end if (p1+p2~=1) error('功率系数p1与p2之和必须等于1'); end %% 生成两个用户的发射符号序列，加入Turbo编码 [sym_seq_u1, bit_seq_u1] = data_gen(bit_total, len_turbo, order_psk(order)); [sym_seq_u2, bit_seq_u2] = data_gen(bit_total, len_turbo, order_psk(order)); % mean(abs(sym_seq_u1).^2) % mean(abs(sym_seq_u2).^2) %% NOMA和OFDMA编码 sym_seq_noma = noma_enc(sym_seq_u1, sym_seq_u2, p1, p2); % mean(abs(sym_seq_noma).^2) % 对两用户数据进行NOMA编码，返回数字绝对值 sym_seq_ofdma = ofdma_enc(sym_seq_u1, sym_seq_u2, N_ofdma_u1, N_ofdma_u2); % mean(abs(sym_seq_ofdma).^2) % 对两用户数据进行OFDMA编码 %% OFDM调制 num_ofdmsym_noma = length(sym_seq_noma)/N_data; mod_ofdm_noma = comm.OFDMModulator(... 'FFTLength',N_ofdm,... 'NumGuardBandCarriers',N_GB,... 'PilotInputPort',true,... 'PilotCarrierIndices',N_P,... 'NumSymbols',num_ofdmsym_noma,... 'CyclicPrefixLength',N_ofdm*CP,... 'InsertDCNull',true); % 构造NOMA的OFDM调制器 num_ofdmsym_ofdma = length(sym_seq_ofdma)/N_data; mod_ofdm_ofdma = comm.OFDMModulator(... 'FFTLength',N_ofdm,... 'NumGuardBandCarriers',N_GB,... 'PilotInputPort',true,... 'PilotCarrierIndices',N_P,... 'NumSymbols',num_ofdmsym_ofdma,... 'CyclicPrefixLength',N_ofdm*CP,... 'InsertDCNull',true); % 构造OFDMA的OFDM调制器 tx_noma = ofdm_tx(sym_seq_noma, mod_ofdm_noma); % tx_noma = sym_seq_noma; tx_ofdma = ofdm_tx(sym_seq_ofdma, mod_ofdm_ofdma); % OFDM调制 % mean(abs(tx_noma).^2) % mean(abs(tx_ofdma).^2) for snr = 1:length(SNR) %% 瑞利信道 % crl = rayleighchan(Ts, FD); % tx_noma = filter(crl, tx_noma); % tx_ofdma = filter(crl, tx_ofdma); cawgn = comm.AWGNChannel('NoiseMethod', 'Signal to noise ratio (SNR)'); cawgn.SNR = SNR(snr); rx_noma = step(cawgn, tx_noma);%阶跃响应绘制 rx_ofdma = step(cawgn, tx_ofdma); % mean(abs(rx_noma).^2) % mean(abs(rx_ofdma).^2) % 接收信号经过瑞利信道与加入高斯噪声 %% OFDM解调 sym_seq_noma_mat = ofdm_rx(rx_noma, mod_ofdm_noma); sym_seq_noma = reshape(sym_seq_noma_mat, numel(sym_seq_noma_mat), 1); % sym_seq_noma = rx_noma; sym_seq_ofdma_mat = ofdm_rx(rx_ofdma, mod_ofdm_ofdma); sym_seq_ofdma = reshape(sym_seq_ofdma_mat, numel(sym_seq_ofdma_mat), 1); % mean(abs(sym_seq_noma).^2) % mean(abs(sym_seq_ofdma).^2) %% NOMA和OFDMA解码 P1用户的功率分配比，谁优先解码 if (p1>p2) [bit_u1, bit_u2] = noma_dec(sym_seq_noma, len_turbo, order_psk(order), p1, p2); else [bit_u2, bit_u1] = noma_dec(sym_seq_noma, len_turbo, order_psk(order), p2, p1); end [n1,r1(order, snr)] = biterr(bit_u1,bit_seq_u1); [n2,r2(order, snr)] = biterr(bit_u2,bit_seq_u2); % 按照功率顺序解码用户1和用户2的符号序列 [bit_u11, bit_u22] = ofdma_dec(sym_seq_ofdma, len_turbo, order_psk(order), N_ofdma_u1, N_ofdma_u2); [n11,r11(order,snr)] = biterr(bit_u11,bit_seq_u1(1:length(bit_u11))); [n22,r22(order,snr)] = biterr(bit_u22,bit_seq_u2(1:length(bit_u22))); [r1(order,snr), r2(order,snr), r11(order,snr), r22(order,snr)] end end % save('ber.mat','r1','r2','r11','r22'); plot_ber(order_psk, SNR, N_data, p1, p2, N_ofdma_u1, N_ofdma_u2); % rmpath('.\comm'); % rmpath('.\lte');