%
%
function BER_MC=c10_MCQPSKrun(N,Eb,No,ChanAtt,...
TimingBias,TimingJitter,PhaseBias,PhaseJitter)
fs = 1e+6
% sampling Rate (samples/second)
SymRate = 1e+5
% symbol rate (symbols/second)
Ts = 1/fs
% sampling period
TSym = 1/SymRate
% symbol period
SymToSend = 100%N
% symbols to be transmitted
ChanBW = 4.99e+5
% bandwidth of channel (Hz)
MeanCarrierPhaseError = PhaseBias
% mean of carrier phase
StdCarrierPhaseError = PhaseJitter
% stdev of phese error
MeanSymbolSyncError = TimingBias
% mean of symbol sync error
StdSymbolSyncError = TimingJitter
% stdev of symbol sync error
ChanGain = 10^(-ChanAtt/20)
% channel gain (linear units)
TxBitClock = Ts/2
% transmitter bit clock
RxBitClock = Ts/2
% reciever bit clock
%
%
Standard deviation of noise and signal amplitude at receiver input.
%
RxNoiseStd = sqrt((10^((No-30)/10))*(fs/2))
% stdev of noise
TxSigAmp = sqrt(10^((Eb-30)/10)*SymRate)
% signal amplitude
%
% Allocate some memory for probes.
%
SampPerSym = fs/SymRate
probe1 = zeros((SymToSend+1)*SampPerSym,1)
probe1counter = 1
probe2 = zeros((SymToSend+1)*SampPerSym,1)
probe2counter = 1
%
% Counters to keep track of how many symbols have have been sent.
%
TxSymSent = 1
RxSymDemod = 0
%
% Buffers that contain the transmitted and received data.
%
[unused,SourceBitsI] = random_binary(SymToSend,1)
[unused,SourceBitsQ] = random_binary(SymToSend,1)
%
% Differentially encode the transmitted data.
%
TxBitsI = SourceBitsI*0
TxBitsQ = SourceBitsQ*0
for k=2:length(TxBitsI)
TxBitsI(k) = or(and(not(xor(SourceBitsI(k),SourceBitsQ(k))),...
xor(SourceBitsI(k),TxBitsI(k-1))), ...
and(xor(SourceBitsI(k),SourceBitsQ(k)),...
xor(SourceBitsQ(k),TxBitsQ(k-1))))
TxBitsQ(k) = or(and(not(xor(SourceBitsI(k),SourceBitsQ(k))),...
xor(SourceBitsQ(k),TxBitsQ(k-1))), ...
and(xor(SourceBitsI(k),SourceBitsQ(k)),...
xor(SourceBitsI(k),TxBitsI(k-1))))
end
%
% Make a complex data stream of the I and Q bits.
%
TxBits = ((TxBitsI*2)-1)+(sqrt(-1)*((TxBitsQ*2)-1))
%
RxIntegrator = 0
% initialize receiver integrator
TxBitClock = 2*TSym
% initialize transmitter
%
% Design the channel filter, and create the filter state array.
%
[b,a] = butter(2,ChanBW/(fs/2))
b=[1]a=[1]
% filter bypassed
[junk,FilterState]=filter(b,a,0)
%
% Begin simulation loop.
%
while TxSymSent <SymToSend
%
% Update the transmitter's clock, and see
% if it is time to get new data bits
%
TxBitClock=TxBitClock+Ts
if TxBitClock >TSym
%
% Time to get new bits
%
TxSymSent=TxSymSent+1
%
% We don't want the clock to increase off
% to infinity, so subtract off an integer number
% of Tb seconds
%
function output_frame = demodulation(input_modu, index)% demodulation for IEEE802.11a
% Input:input_modu, complex values representing constellation points
% index
% Output: output_frame, output bit stream (data unit is one bit)
% In this version, increase the quatilization levels into 8.
% note: Matlab index starts from 1
Q_length=length(input_modu)
QAM_input_I = real(input_modu)
QAM_input_Q = imag(input_modu)
output_frame = zeros(1,length(input_modu)*index)
switch index
case 1,
BPSK_Demodu_I = [0 1] %f(m)=(m+1)/2 + 1, so I=-1 --->1, I=1 --->2
idx = find(QAM_input_I>1)
QAM_input_I(idx) = 1
idx = find(QAM_input_I<-1)
QAM_input_I(idx) = -1
output_frame = BPSK_Demodu_I(round((QAM_input_I+1)/2) + 1)
case 2,
QPSK_Demodu_IQ = [0 1]%f(m)=(m+1)/2 + 1, so I=-1 --->1, I=1 --->2
idx = find(QAM_input_I>派租告尘明1)
QAM_input_I(idx) = 1
idx = find(QAM_input_I<-1)
QAM_input_I(idx) = -1
idx = find(QAM_input_Q>1)
QAM_input_Q(idx) = 1
idx = find(QAM_input_Q<-1)
QAM_input_Q(idx) = -1
output_frame(1:2:end) = QPSK_Demodu_IQ(round((QAM_input_I+1)/2) + 1)
output_frame(2:2:end) = QPSK_Demodu_IQ(round((QAM_input_Q+1)/2) + 1)
case 3,
remapping=[0 0 00 0 10 1 00 1 11 0 01 0 11 1 01 1 1].'
for i=1:Q_length
phase_det=[2<QAM_input_I(i)&0<QAM_input_Q(i) 0<型中QAM_input_I(i)&QAM_input_I(i)<2&0<QAM_input_Q(i) QAM_input_I(i)<-2&0<QAM_input_Q(i) -2<QAM_input_I(i)&QAM_input_I(i)<0&0<QAM_input_Q(i) QAM_input_I(i)<-2&QAM_input_Q(i)<0 QAM_input_I(i)<0&-2<QAM_input_I(i)&QAM_input_Q(i)<0 2<QAM_input_I(i)&QAM_input_Q(i)<0 0<QAM_input_I(i)&QAM_input_I(i)<2&QAM_input_Q(i)<0]
a=find(phase_det)
output_frame((1+(i-1)*3):(3+(i-1)*3))=remapping((1+(a-1)*3):(3+(a-1)*3))
end
case 4,
QAM_16_Demodu_IQ = [0 1 3 2] %f(m)=(m+3)/2 + 1, so I=-3 --->1, I=1 --->3
idx = find(QAM_input_I>3)
QAM_input_I(idx) = 3
idx = find(QAM_input_I<-3)
QAM_input_I(idx) = -3
idx = find(QAM_input_Q>3)
QAM_input_Q(idx) = 3
idx = find(QAM_input_Q<-3)
QAM_input_Q(idx) = -3
tmp = round((QAM_input_I+3)/2) + 1
output_frame(1:4:end) = bitget(QAM_16_Demodu_IQ(tmp),2)
output_frame(2:4:end) = bitget(QAM_16_Demodu_IQ(tmp),1)
tmp = round((QAM_input_Q+3)/2) + 1
output_frame(3:4:end) = bitget(QAM_16_Demodu_IQ(tmp),2)
output_frame(4:4:end) = bitget(QAM_16_Demodu_IQ(tmp),1)
case 5,
remapping=[0 0 0 0 00 0 0 0 10 0 0 1 00 0 0 1 10 0 1 0 00 0 1 0 10 0 1 1 00 0 1 1 1
0 1 0 0 00 1 0 0 10 1 0 1 00 1 0 1 10 1 1 0 00 1 1 0 10 1 1 1 00 1 1 1 1
1 0 0 0 01 0 0 0 11 0 0 1 01 0 0 1 11 0 1 0 01 0 1 0 11 0 1 1 01 0 1 1 1
1 1 0 0 01 1 0 0 11 1 0 1 01 1 0 1 11 1 1 0 01 1 1 0 11 1 1 1 01 1 1 1 1].'
for i=1:Q_length
phase_det=[4<QAM_input_I(i)&0<QAM_input_Q(i)&QAM_input_Q(i)<22<QAM_input_I(i)&QAM_input_I(i)<4&0<QAM_input_Q(i)&QAM_input_Q(i)<20<QAM_input_I(i)&QAM_input_I(i)<2&0<QAM_input_Q(i)&QAM_input_Q(i)<24<QAM_input_I(i)&2<QAM_input_Q(i)&QAM_input_Q(i)<4
2<QAM_input_I(i)&QAM_input_I(i)<4&2<QAM_input_Q(i)&QAM_input_Q(i)<40<QAM_input_I(i)&QAM_input_I(i)<2&2<QAM_input_Q(i)&QAM_input_Q(i)<42<QAM_input_I(i)&QAM_input_I(i)<4&4<QAM_input_Q(i)0<QAM_input_I(i)&QAM_input_I(i)<2&4<QAM_input_Q(i)
QAM_input_I(i)<-4&0<QAM_input_Q(i)&QAM_input_Q(i)<2-4<QAM_input_I(i)&QAM_input_I(i)<-2&0<QAM_input_Q(i)&QAM_input_Q(i)<2-2<QAM_input_I(i)&QAM_input_I(i)<0&0<QAM_input_Q(i)&QAM_input_Q(i)<2QAM_input_I(i)<-4&2<QAM_input_Q(i)&QAM_input_Q(i)<4
-4<QAM_input_I(i)&QAM_input_I(i)<-2&2<QAM_input_Q(i)&QAM_input_Q(i)<4-2<QAM_input_I(i)&QAM_input_I(i)<0&2<QAM_input_Q(i)&QAM_input_Q(i)<4-4<QAM_input_I(i)&QAM_input_I(i)<-2&4<QAM_input_Q(i)-2<QAM_input_I(i)&QAM_input_I(i)<0&4<QAM_input_Q(i)
QAM_input_I(i)<-4&-2<QAM_input_Q(i)&QAM_input_Q(i)<0-4<QAM_input_I(i)&QAM_input_I(i)<-2&-2<QAM_input_Q(i)&QAM_input_Q(i)<0-2<QAM_input_I(i)&QAM_input_I(i)<0&0<QAM_input_Q(i)&QAM_input_Q(i)<0QAM_input_I(i)<-4&-4<QAM_input_Q(i)&QAM_input_Q(i)<-2
-4<QAM_input_I(i)&QAM_input_I(i)<-2&-4<QAM_input_Q(i)&QAM_input_Q(i)<-2-2<QAM_input_I(i)&QAM_input_I(i)<0&-4<QAM_input_Q(i)&QAM_input_Q(i)<-2-4<QAM_input_I(i)&QAM_input_I(i)<-2&QAM_input_Q(i)<-4-2<QAM_input_I(i)&QAM_input_I(i)<0&QAM_input_Q(i)<-4
4<QAM_input_I(i)&-2<QAM_input_Q(i)&QAM_input_Q(i)<02<QAM_input_I(i)&QAM_input_I(i)<4&-2<QAM_input_Q(i)&QAM_input_Q(i)<00<QAM_input_I(i)&QAM_input_I(i)<2&0<QAM_input_Q(i)&QAM_input_Q(i)<04<QAM_input_I(i)&-4<QAM_input_Q(i)&QAM_input_Q(i)<-2
2<QAM_input_I(i)&QAM_input_I(i)<4&-4<QAM_input_Q(i)&QAM_input_Q(i)<-20<QAM_input_I(i)&QAM_input_I(i)<2&-4<QAM_input_Q(i)&QAM_input_Q(i)<-22<QAM_input_I(i)&QAM_input_I(i)<4&QAM_input_Q(i)<-40<QAM_input_I(i)&QAM_input_I(i)<2&QAM_input_Q(i)<-4]
a=find(phase_det)
output_frame((1+(i-1)*5):(5+(i-1)*5))=remapping((1+(a-1)*5):(5+(a-1)*5))
end%5+i 3+i 1+i 5+3*i 3+3*i 1+3*i 3+5*i 1+5*i -5+i -3+i -1+i -5+3*i -3+3*i -1+3*i -3+5*i -1+5*i -5-i -3-i -1-i -5-3*i -3-3*i -1-3*i -3-5*i -1-5*i 5-i 3-i 1-i 5-3*i 3-3*i 1-3*i 3-5*i 1-5*i
case 6,
QAM_64_Demodu_IQ = [0 1 3 2 6 7 5 4] %f(m)=(m+7)/2 + 1, so I=-7 --->1, I=1 --->5
idx = find(QAM_input_I>7)
QAM_input_I(idx) = 7
idx = find(QAM_input_I<-7)
QAM_input_I(idx) = -7
idx = find(QAM_input_Q>7)
QAM_input_Q(idx) = 7
idx = find(QAM_input_Q<-7)
QAM_input_Q(idx) = -7
tmp = round((QAM_input_I+7)/2) + 1
output_frame(1:6:end) = bitget(QAM_64_Demodu_IQ(tmp),3)
output_frame(2:6:end) = bitget(QAM_64_Demodu_IQ(tmp),2)
output_frame(3:6:end) = bitget(QAM_64_Demodu_IQ(tmp),1)
tmp = round((QAM_input_Q+7)/2) + 1
output_frame(4:6:end) = bitget(QAM_64_Demodu_IQ(tmp),3)
output_frame(5:6:end) = bitget(QAM_64_Demodu_IQ(tmp),2)
output_frame(6:6:end) = bitget(QAM_64_Demodu_IQ(tmp),1)
end
您好,您这样:clc
clear
fc=4800fs=12000fb=2400
%要调制的数字信号
a=randint(1,12,2)%随机产生12个“0”,“1”
s=zeros(1,60)
for i=1:12
for j=1:5
if(a(i)==0)
斗裤谈 s(j+(i-1)*5)=0
else
s(j+(i-1)*5)=1
end
end
end
plot(s)xlabel('基带信号')
figure
pwelch(s)%功率谱
figure
%波形成形滤波器(平方根升余弦滚降)
h=firrcos(14,1200,1200,4800,'sqrt')
figure
stem(h)xlabel('成形滤波器的单位冲击响应')
[H,W]=freqz(h,1)
H=abs(H)
figure
plot(H)xlabel('成形滤波器的频率响应')
s=fftfilt(h,s)
figure
plot(s)xlabel('通过成形滤波器后的基带信号')
figure
pwelch(s)%经波形成形滤波器后的功率谱
%已调信号
e=dmod(a,4800,2400,12000,'空碰psk',2)%调制
figure
plot(e)xlabel('已调信号')
enoise=e+randn(1,60)%enoise=e+.1*randn(1,60)不同功率的高斯白噪声
aa=ddemod(enoise,4800,2400,12000,'psk',2)%解调
figure
stem(aa)xlabel('解调后的数字信号')%解调后的数字信号
p=symerr(a,aa)/12 %误码率
%误码率曲线
figure
r=-6:3:12
rr=10.^(r/10)
pe1=1/2*exp(-rr)%相干解调的误码率曲线
hold on
plot(r,pe1,'r')grid on
pe2=(1-1/2*erfc(sqrt(rr))).*erfc(sqrt(rr))%差分相干解调的误码纯租率曲线
plot(r,pe2,'b')xlabel('bpsk,dpsk误码率曲线')
set(gca,'XTick',-6:3:18)
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