?? sdanal.m
字號:
%%%%+++++++++++++++++++++++++ INPUT PARAMETERSNc=127; %%%%%%% code lengthMc=3; %%%%%%% # of samples per chipNs=Nc*Mc; %%%%%%% # of samples per information symbolIn=10; %%%%%%% no. of information symbols processed in one snapshot Nl=5*Mc; %%%%%%% max. delay spread in sample periodsK=20; %%%%%%% number of interferersLs=Nl; %%%%%%% step in computing covariance of I+NL=5; %%%%%%% number of antenassensors=(0:L-1).'/2; %%%%%%% positions of antennassqn=sqrt(0.5); %%%%%%% 1/2 of st.dev. of noisethetaI=[-K/2:-1 1:K/2]*2/3*pi/(K+1); %%%%% angular positions of interferersAi=exp(i*2*pi*sensors*sin(thetaI));thetaS=[0 -15]*2*pi/180; %%%%% angular positions of SOI (one side path)M=2; %%%%% number of multipathsi=sqrt(-1);As=exp(i*2*pi*sensors*sin(thetaS));Em=zeros(M,Nl);Em(1,1)=1; Em(M,Nl)=1; %%%%% valid for M=2 only. Side path of SOI is delayed by Nl.%%+++++++++++++++++++++++++++++=++++ COMPUTATION OF R_M, R_L, and R_E%first_row_RL= Nc*[Mc:-1:1 zeros(1,Nl-Mc)];R_L=toeplitz(first_row_RL',first_row_RL);first_row_RM=zeros(1,Nl);k1=1:Mc; k2=Mc+1:2*Mc;first_row_RM(1:2*Mc)=Nc*[3*k1.^3-k1.^2*(6*Mc+9)+6*k1*(2*Mc+1)+4*Mc*(Mc^2-1) ... -(k2-2*Mc).*(k2-2*Mc-1).*(k2-2*Mc-2)]/(6*Mc);R_M=toeplitz(first_row_RM',first_row_RM); R_E=Em*R_L*inv(R_M)*R_L*Em';%%+++++++++++++++++++++++++++++=++++ COMPUTATION OF QRIN=Ai*Ai'+2*sqn*eye(L);Q=As'*inv(RIN)*As;%%+++++++++++++++++++++++++++++=++++ COMPUTATION OF SINR_outSINR1=real(sum(diag(Q*R_E)));SINR2=SINR1+(sum(diag(Q^2*R_E)))^2/sum(diag(Q*R_E))-sum(diag(Q^3*R_E));SINR2=real(SINR2);[SINR1 SINR2]
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