function [soft_bits,evm] = rx_qam64_demod(rx_symbols)
soft_bits = zeros(6,length(rx_symbols)); % Each symbol consists of 6 bits
bit2=zeros(1,length(rx_symbols));
bit5=zeros(1,length(rx_symbols));
bit0 = real(rx_symbols);
for i=1:length(rx_symbols)
if(bit0(i)>0)
bit0(i)=1;
else
bit0(i)=0;
end
end
bit3 = imag(rx_symbols);
for i=1:length(rx_symbols)
if(bit3(i)>0)
bit3(i)=1;
else
bit3(i)=0;
end
end
bit1 = 4/sqrt(42)-abs(real(rx_symbols));
for i=1:length(rx_symbols)
if(bit1(i)>0)
bit1(i)=1;
else
bit1(i)=0;
end
end
bit4 = 4/sqrt(42)-abs(imag(rx_symbols));
for i=1:length(rx_symbols)
if(bit4(i)>0)
bit4(i)=1;
else
bit4(i)=0;
end
end
for m=1:length(rx_symbols)
if abs(4/sqrt(42)-abs(real(rx_symbols(m))))<=2/sqrt(42) % bit is one
bit2(m) = 1;
else
bit2(m) = 0; % bit is zero
end;
if abs(4/sqrt(42)-abs(imag(rx_symbols(m)))) <= 2/sqrt(42) % bit is one
bit5(m) = 1;
else
bit5(m) = 0;
end;
end;
soft_bits(1,:) = bit0;
soft_bits(2,:) = bit1;
soft_bits(3,:) = bit2;
soft_bits(4,:) = bit3;
soft_bits(5,:) = bit4;
soft_bits(6,:) = bit5;
evm_real=zeros(1,length(rx_symbols));
evm_image=zeros(1,length(rx_symbols));
for i=1:length(rx_symbols)
soft_bits_i=soft_bits(:,i);
if(soft_bits_i==[0;0;0;1;0;0])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[0;0;1;1;0;0])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[0;1;1;1;0;0])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[0;1;0;1;0;0])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[1;1;0;1;0;0])
evm_real(i)=real(rx_symbols(i))-1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[1;1;1;1;0;0])
evm_real(i)=real(rx_symbols(i))-3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[1;0;1;1;0;0])
evm_real(i)=real(rx_symbols(i))-5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[1;0;0;1;0;0])
evm_real(i)=real(rx_symbols(i))-7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-7/sqrt(42);
elseif(soft_bits_i==[0;0;0;1;0;1])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[0;0;1;1;0;1])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[0;1;1;1;0;1])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[0;1;0;1;0;1])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[1;1;0;1;0;1])
evm_real(i)=real(rx_symbols(i))-1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[1;1;1;1;0;1])
evm_real(i)=real(rx_symbols(i))-3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[1;0;1;1;0;1])
evm_real(i)=real(rx_symbols(i))-5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[1;0;0;1;0;1])
evm_real(i)=real(rx_symbols(i))-7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-5/sqrt(42);
elseif(soft_bits_i==[0;0;0;1;1;1])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[0;0;1;1;1;1])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[0;1;1;1;1;1])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[0;1;0;1;1;1])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[1;1;0;1;1;1])
evm_real(i)=real(rx_symbols(i))-1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[1;1;1;1;1;1])
evm_real(i)=real(rx_symbols(i))-3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[1;0;1;1;1;1])
evm_real(i)=real(rx_symbols(i))-5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[1;0;0;1;1;1])
evm_real(i)=real(rx_symbols(i))-7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-3/sqrt(42);
elseif(soft_bits_i==[0;0;0;1;1;0])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[0;0;1;1;1;0])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[0;1;1;1;1;0])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[0;1;0;1;1;0])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[1;1;0;1;1;0])
evm_real(i)=real(rx_symbols(i))-1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[1;1;1;1;1;0])
evm_real(i)=real(rx_symbols(i))-3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[1;0;1;1;1;0])
evm_real(i)=real(rx_symbols(i))-5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[1;0;0;1;1;0])
evm_real(i)=real(rx_symbols(i))-7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))-1/sqrt(42);
elseif(soft_bits_i==[0;0;0;0;1;0])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[0;0;1;0;1;0])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[0;1;1;0;1;0])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[0;1;0;0;1;0])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[1;1;0;0;1;0])
evm_real(i)=real(rx_symbols(i))-1/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[1;1;1;0;1;0])
evm_real(i)=real(rx_symbols(i))-3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[1;0;1;0;1;0])
evm_real(i)=real(rx_symbols(i))-5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[1;0;0;0;1;0])
evm_real(i)=real(rx_symbols(i))-7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+1/sqrt(42);
elseif(soft_bits_i==[0;0;0;0;1;1])
evm_real(i)=real(rx_symbols(i))+7/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+3/sqrt(42);
elseif(soft_bits_i==[0;0;1;0;1;1])
evm_real(i)=real(rx_symbols(i))+5/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+3/sqrt(42);
elseif(soft_bits_i==[0;1;1;0;1;1])
evm_real(i)=real(rx_symbols(i))+3/sqrt(42);
evm_image(i)=imag(rx_symbols(i))+3/sqrt(42);
elseif(soft_bits_i==[0;1;0;0;1;1])
evm_real(i)=real(rx_symbols(i))+1/sqrt(42);
evm_image(i)=imag(rx_sy
全数字QAM调制解调收发代码
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2022-10-15
15:49:35
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QAM.zip （21个子文件） 
QAM 
modulate_sig.m 1KB rise_cos.m 301B rx_16QAM.m 5KB rx_frequency_sync.m 465B delete_pilot.m 369B insert_value.m 152B pick_sig.m 140B m_sequence.m 387B tx_16QAM.m 6KB phase_comp.m 276B rx_qam64_demod.m 11KB creat_training.m 560B rx_qam16_demod.m 3KB plot_astrology.m 204B syn_time.m 744B modulation.m 2KB insert_pilot.m 467B demodulate_sig.m 748B rx_qpsk_demod.m 746B time_training.m 402B rx_demodulate.m 548B
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