5G NR PDSCH DMRS 解扰matlab模拟全流程代码
时间: 2023-08-11 15:07:44 浏览: 49
以下是5G NR PDSCH DMRS 解扰matlab模拟全流程代码:
```matlab
% 5G NR PDSCH DMRS 解扰matlab模拟全流程代码
% 设置参数值
N_RB = 100; % 资源块数
N_sc_RB = 12; % 每个资源块的子载波数
N_SC = N_RB*N_sc_RB; % 总的子载波数
N_symbs_per_slot = 14; % 每个时隙的OFDM符号数
N_bits_per_symb = 2*N_sc_RB*7; % 每个OFDM符号中的比特数
N_bits = N_symbs_per_slot*N_bits_per_symb; % 每个时隙的总比特数
N_layers = 2; % 层数
q_m = 4; % 星座中的符号数
N_RE = N_SC*N_symbs_per_slot; % 一个时隙中的总资源元素数
R = N_bits/N_RE; % 信息速率
% 生成随机数据
data_bits = randi([0,1],N_bits,1);
% 生成QPSK调制的星座图
qpsk_symbs = zeros(1,q_m);
qpsk_symbs(1) = complex(1,1);
qpsk_symbs(2) = complex(-1,1);
qpsk_symbs(3) = complex(-1,-1);
qpsk_symbs(4) = complex(1,-1);
% 将随机数据映射到星座图
data_symbs = zeros(N_RE*N_layers,1);
for i=1:N_RE*N_layers
data_symbs(i) = qpsk_symbs(bi2de(data_bits((i-1)*2+1:i*2)+1,'left-msb')+1);
end
% 生成PDSCH DMRS符号序列
pdsch_dmrs_symbs = zeros(N_RE,1);
for i=1:N_RE
n_SCID = mod(floor((i-1)/N_sc_RB),2);
n_RS = mod(i-1,N_sc_RB);
if (n_RS<4)
pdsch_dmrs_symbs(i) = complex(1,1);
else
alpha = 2*pi/3*(n_SCID+floor(n_RS/4));
pdsch_dmrs_symbs(i) = complex(cos(alpha),sin(alpha));
end
end
% 生成PDSCH DMRS矩阵
pdsch_dmrs_matrix = zeros(N_RE,N_layers);
for i=1:N_layers
pdsch_dmrs_matrix(:,i) = pdsch_dmrs_symbs;
end
% 生成PDSCH符号序列
pdsch_symbs = data_symbs.*pdsch_dmrs_matrix;
% 生成OFDM符号序列
ofdm_symbs = zeros(N_SC,N_symbs_per_slot,N_layers);
for i=1:N_layers
ofdm_symbs(:,:,i) = ifft(pdsch_symbs(:,i),N_SC);
end
% 添加循环前缀
ofdm_symbs_cp = zeros(N_SC+N_sc_RB,N_symbs_per_slot,N_layers);
ofdm_symbs_cp(1:N_sc_RB,:,:) = ofdm_symbs(N_SC-N_sc_RB+1:N_SC,:,:);
ofdm_symbs_cp(N_sc_RB+1:N_SC+N_sc_RB,:,:) = ofdm_symbs(:,:,:);
ofdm_symbs_cp(:,:,1) = [ofdm_symbs_cp(:,N_symbs_per_slot,:);ofdm_symbs_cp(:,:,1)];
for i=2:N_symbs_per_slot
ofdm_symbs_cp(:,:,i) = [ofdm_symbs_cp(:,i-1,i);ofdm_symbs_cp(:,:,i)];
end
% 将OFDM符号序列转换为时间域的信号
tx_signal = reshape(ofdm_symbs_cp,N_SC+N_sc_RB,N_symbs_per_slot*N_layers);
% 解扰PDSCH符号序列
rx_data_symbs = pdsch_symbs./pdsch_dmrs_matrix;
% 将PDSCH符号序列映射回比特序列
rx_data_bits = zeros(N_bits,1);
for i=1:N_RE*N_layers
rx_data_bits((i-1)*2+1:i*2) = de2bi(find(qpsk_symbs==rx_data_symbs(i))-1,2,'left-msb');
end
% 计算误码率
num_errors = sum(xor(data_bits,rx_data_bits));
ber = num_errors/N_bits;
```
上述代码实现了5G NR PDSCH DMRS解扰的全流程,包括随机数据生成、星座映射、PDSCH DMRS序列生成、PDSCH符号序列生成、OFDM符号序列生成、循环前缀添加、信号转换、PDSCH符号序列解扰、比特映射、误码率计算等步骤。