function?[berbits]=chap3_ex02_qpsk（EbNomaxNumErrsmaxNumBits）
%%Initializations
persistent?Modulator?AWGN?DeModulator?BitError???%預(yù)設(shè)系統(tǒng)所需要的模塊
if?isempty（Modulator）
????????Modulator=comm.QPSKModulator（‘BitInput‘true）;
????????AWGN=comm.AWGNChannel;
????????DeModulator=comm.QPSKDemodulator（‘BitOutput‘true）;
????????BitError=comm.ErrorRate;
end
%%Constants??初始化系統(tǒng)模塊參量
FRM=4096;
m=4;
K=log2（m）;%在m進(jìn)制，每個(gè)碼元鎖攜帶的信息量
snr=EbNo+10*log10（K）;
AWGN.EbNo=snr;
%%Processing?loop?modeling?tranmitter?channel?mode1?and?receiver?處理系統(tǒng)發(fā)射機(jī)，信道，接收機(jī)
numErrs=0;
numBits=0;
results=zeros（31）;
while（（numErrs????????%Tranmitter??發(fā)射機(jī)
????????u=randi（[01]FRM1）;%Random?bits?generation
????????mod_sig=Modulator.step（u）;%QPSK?Modulator
????????rx_sig=AWGN.step（mod_sig）;%AWGN?Channel
????????%Channel??信道
????????demod=DeModulator.step（rx_sig）;%QPSK?Demodulator
????????%Receiver??接收機(jī)
????????y=demod（1:FRM）;%Compute?output?bits
????????results=BitError.step（uy）;%Update?BER
????????numErrs=results（2）;
????????numBits=results（3）;
end
%%Clean?up?&?collect?results
ber=results（1）;
bits=results（3）;
reset（BitError）;

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件?????????649??2017-12-20?09:56??demo.m
?????文件????????1154??2017-12-20?09:56??hard.m
?????文件????????1410??2017-12-20?09:55??soft.m
?????文件????????1221??2017-12-20?00:32??chap3_ex02_qpsk.m