1.軟件版本

matlab2013b

2.本算法理論知識

RFID的接口過程滿足如下的結構框圖：

3.核心代碼

clc; %清屏 close all; %關閉所有窗口 clear all; %清除所有變量 warning off; addpath 'func\'%% %參數定義 %信息碼長度 SNR = [10:1:17]; TDL = [500,400,300,200,100,50,20,10]; ERR = zeros(1,length(SNR));for jj = 1:length(SNR)jjNum = 0;Ber = 0;while Ber <= TDL(jj); Num = Num + 1;BerFrame_length = 10*64; %信息碼速率為10KHzRates = 10e3; %發送帶寬20KHzBwidth = 2*Rates; %發送信號功率2WTpower = 2; %載波頻率70MHzfc = 70e6; %采樣頻率280MHz,滿足四倍采樣fs = fc*4; %20KHz方波Swave1 = 20e3; %40KHz方波Swave2 = 40e3; %采樣點數M = fs/(2*Swave2); %信息碼采樣點L = fs/Rates; %2ASK調制的調制度ma = 0.5; %alpha值alpha = 2*ma/(1-ma); %%%隨機信息碼產生data_code0 = zeros(1,Frame_length);%隨機產生信息碼data_code0 =(randn(1,Frame_length)>=0.5);%%%CRC校驗data_code = func_CRC(data_code0);%%%數據采樣化data_code_sample = func_samples(data_code,Frame_length,L);%%%編碼data_code_sample = func_encode(data_code_sample,data_code,Frame_length,L,M);%%%調制發送%FIR低通濾波器設計data_sample_fir = func_filter(data_code_sample,fs,fc);T = Frame_length*L*(1/fs);t = [0:1/fs:T-(1/fs)];Carriers = cos(2*pi*fc*t);%ASK調制RFID_ASK =((2*Tpower).^0.5)*(1+alpha*data_sample_fir).*Carriers;%ASK調制信號加正弦波干擾RFID_ASK_sin = RFID_ASK + 10*cos(2*pi*fc*t+pi/6); %高斯信道snr = SNR(jj); RFID_ASK_sin_N = awgn(RFID_ASK_sin,snr,'measured');figure(1);subplot(221)plot(RFID_ASK(100:1000));title('2ASK調制信號');axis([0,1000,-10,10]);subplot(222)plot(RFID_ASK_sin(100:1000));grid on;title('ASK調制信號加正弦波干擾');axis([0,1000,-30,30]);subplot(223)plot(RFID_ASK_sin_N(100:1000));grid on;title('過信道之后信號');axis([0,1000,-30,30]);%限幅AMP = 10;RFID_ASK_sin_N_amp = func_amp_limit(RFID_ASK_sin_N,AMP);%ASK解調[RFID_deASK_filter,amp]=func_AKS_Demod(RFID_ASK_sin_N_amp,Carriers,fc,fs);subplot(224)plot(RFID_deASK_filter(100:end));grid on;title('2ASK解調信號');axis([0 L*Frame_length -5 20]);%判決門限RFID_deASK10 = func_unsamples(amp,Frame_length,M);%解碼data_code_rec = func_decode(RFID_deASK10,Frame_length);%統計誤碼率Err_rate = func_err(data_code_rec,data_code,Frame_length);Ber = Ber + Err_rate*Frame_length;endERR(jj) = Ber/(Num*Frame_length); endfigure; semilogy(SNR,ERR,'b-o'); xlabel('SNR'); ylabel('BER'); grid on;

4.操作步驟與仿真結論

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?5.參考文獻

A01-94?

6.完整源碼獲得方式

方式1：微信或者QQ聯系博主

方式2：訂閱MATLAB/FPGA教程，免費獲得教程案例以及任意2份完整源碼

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