add_freqdomain_reponse.m

来自「程序里面包含各部分算法仿真 可供参考和使用」· M 代码 · 共 51 行

function ofdm_sym = add_freqdomain_reponse(pilot_added,H_freq,N_subc,N_syn_preamble,...
    N_sym,N_Rx_ant,N_Tx_ant,var_noise,ofdm_sym,ChannelEffectTest,AddChFreq)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% 在频域加信道响应，其响应为理想信道响应

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

ofdm_sym = zeros(N_subc, N_sym - N_syn_preamble , N_Rx_ant );
if AddChFreq
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
    if (ChannelEffectTest == 0)
        % 加信道响应
        for n_r = 1:N_Rx_ant
            for n_t = 1:N_Tx_ant
                ofdm_sym(:,:,n_r) = ofdm_sym(:,:,n_r) + pilot_added(:,:,n_t).*...
                    H_freq(:,N_syn_preamble+1:N_sym,(n_r-1)*N_Tx_ant + n_t);
            end
        end
        % 加高斯白噪
        ofdm_sym = ofdm_sym + sqrt(var_noise)*( randn(N_subc, N_sym - N_syn_preamble , N_Rx_ant ) + ...
            j*randn(N_subc, N_sym - N_syn_preamble , N_Rx_ant ));
    end
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
    if (ChannelEffectTest == 1)
        for n_r = 1:N_Rx_ant
            for n_t = 1:N_Tx_ant
                ofdm_sym(:,:,n_r) = ofdm_sym(:,:,n_r) + pilot_added(:,:,n_t).*...
                    H_freq(:,N_syn_preamble+1:N_sym,(n_r-1)*N_Tx_ant + n_t);
            end
        end
        
    end
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
    if (ChannelEffectTest == 2)
        ofdm_sym = pilot_added + sqrt(var_noise)*( randn(N_subc, N_sym - N_syn_preamble , N_Rx_ant ) + ...
            j*randn(N_subc, N_sym - N_syn_preamble , N_Rx_ant ));
    end
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
    
else
    ofdm_sym = pilot_added;
end