信道cost207

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%%                                  PDP
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clc;
clear all;
close all;
warning off;
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%%                              simulation
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Step = 0.01;
Delay_Spread = 0.1;% 0.98 2.53 6.88
% RA
delay = [0:Step:0.7];
C = exp（-9.2*delay）;
C = C./C（1）;
C = 10*log10（C）;
figure（1）;
plot（delayC‘k-‘‘linewidth‘2）;
axis（[0 20 -25 0]）;
grid on;
xlabel（‘\tau （us）‘）;
ylabel（‘dB‘）;
legend（‘远郊地区‘）;
% TU
Delay_Spread = 0.98;
delay = [0:Step:7];
C = exp（-1*delay）;
C = C./C（1）;
C = 10*log10（C）;
figure（2）;
plot（delayC‘k-‘‘linewidth‘2）;
axis（[0 20 -25 0]）;
grid on;
xlabel（‘\tau （us）‘）;
ylabel（‘dB‘）;
legend（‘典型城区‘）;
% BU
Delay_Spread = 2.53;
delay = [0:Step:5-Step];
C1 = exp（-1*delay）;
C1 = C1./C1（1）;

delay = [5:Step:10];
C2 = 0.5*exp（（5-delay））;
C2 = C2./C1（1）;

C = [C1 C2];
C = 10*log10（C）;

figure（3）;
plot（[0:Step:10]C‘k-‘‘linewidth‘2）;
axis（[0 20 -25 0]）;
grid on;
xlabel（‘\tau （us）‘）;
ylabel（‘dB‘）;
legend（‘恶劣城区‘）;

% HT
Delay_Spread = 6.88;
delay = [0:Step:2-Step];
C1 = exp（-3.5*delay）;
C1 = C1./C1（1）;
figure（4）;
plot（delay10*log10（C1）‘k-‘‘linewidth‘2）;hold on;

delay = [15:Step:20];
C2 = 0.1*exp（（15-delay））;
C2 = C2