MATLAB for Digital Communication: y=awgn_(x,SNRdB,sigpowerdB) - File Exchange

Code covered by the BSD License

Highlights from
MATLAB for Digital Communication

AI=inv_GF2(A)
H_est=channel_estimate(X,y) X = Known frequency-domain training symbol
I=Gauss_Hermite(f,N,varargin) Refer to 'Applied Numerical Methods Using MATLAB' by Won Yang et. al
IFO_est=IFO_estimate(y,X,IFO_... To estimate the IFO (Integral Frequency Offset)
M=combis(N,i) Creates an error pattern matrix each row of which is an N-dimensional
PRS=phase_ref_symbol()
PSK_slicer(x,M) Converts received signal points into regular PSK points by its angle
Sk=Sk_CTFS(k,D)
[CR,DR,Nbpsc,Ncbps,Ndbps,pun_...
[H,G]=Hamm_gen(m,opt) Generates the parity-check/generator matrices for Hamming Code.
[J,JJ]=Jkb(K,beta) The 1st kind of kth-order Bessel function
[Xk,kk,xht,tt]=CTFS(x,P,N,ng)
[Xk,kk,xht,tt]=CTFT(x,D,ng)
[c,b]=dfe(c,b,ys,ds,e,delta) updates decision feedback equalizer(DFE) coefficients
[c,se]=ade(c,y,a,delta) adaptive equalizer
[code,dictionary,w]=LZW_code(... LZW coding algorithm
[codebook,class,quant_errs]=v... Finds a KxN codebook representing the samples in an MxN data matrix X,
[d,dcode]=adc(a,b,c,code_tabl... Analog-to-Digital Conversion
[decode,dictionary]=LZW_decod... Lempel-Ziv-Welch decoding algorithm
[decoded_seq,dictionary]=LZW_... Lempel-Ziv-Welch decoding procedure
[decodes,E,epi]=cyclic_decode... Cyclic (N,K) decoding of received code_seq with generator polynml g
[gM,m]=gm2gM(gm) Convert into PNG polynomial description used by Simulink -Eq.(10.1.2)
[g_code,b_code]=gray_code(b)
[h,L,H]=Huffman_code(p,opt) Huffman code generator gives a Huffman code matrix h,
[long_preamble,Xl]=long_train...
[nxb,yb]=state_eq(xb,u,G) To be used as a subroutine for conv_encoder()
[output,state]=TCM_encoder(st... Generates the output sequence of a binary TCM encoder
[output,state]=conv_encoder(G... generates the output sequence of a binary convolutional encoder
[outputs,state]=TCM_encoder1(... generates the output sequence of a binary TCM encoder
[pemb,nombe,notmb]=TCM(state_... Copyleft: Won Y. Yang, wyyang53@hanmail.net, CAU for academic use only
[pemb,nombe,notmb]=TCM1(Gc,Co...
[pemb,nombe,notmb]=Viterbi_QA... Constraint length vector
[phi,lags]=xcorr_my(x,y,opt) computes the crosscorrelation of two vectors x and y by Eq.(2.1.61)
[s1,x]=TCM_state_eq0(s,u,Cons... State equation for the TCM_encoder in Fig. 9.14(a)
[s1,x]=TCM_state_eq1(s,u,Cons...
[short_preamble,Xs]=short_tra...
[t,w]=Gausshp(N)
[xqhn,P,a]=prdctr(en,xqs,M,P,... One-step-ahead predictor based on RLSE
[y,xmax]=Alaw(x,A,ymax)
[y,xmax]=mulaw(x,mu,ymax)
a=slice(x,A)
bitseq=QAM_dem(qamseq,b,bpsym... BPSK demodulation
c=PNG(gm,Kc,x) generates an m-sequence from a feedback-shift register if Kc=0
c=mmsee(y,a,K,d)
c=zfe(g,K,d)
channel(x,h,ch_buf)
coarse_CFO_estimate(tx,NB,Nw,...
coded_seq=LZW_coding(src,dict... Lempel-Ziv-Welch encoding procedure
coded_seq=source_coding(src,s... Encode a data sequence src based on the given (symbols,codewords).
compensate_CFO(tx,CFO_est,Nff... CFO_est = Estimated carrier frequency offset
cyclic_encoder(msg_seq,N,K,g) Cyclic (N,K) encoding of input msg_seq m with generator polynomial g
d=detector_FSK(z2s)
d=detector_MSK(dth)
d=detector_PSK(th,M)
dc0301_3(U_or_L) simulates USSB/LSSB-AM depending on the value of USSB_or_LSSB=0/1
decoded_seq=TCM_decoder(state... Performs the Viterbi algorithm on the PSK demodulated signal
decoded_seq=TCM_decoder1(Gc,d... performs the Viterbi algorithm on the PSK demodulated signal
decoded_seq=source_decoding(c... Decode a coded_seq based on the given (codewords,symbols).
decoded_seq=vit_decoder(G,K,d... performs the Viterbi algorithm on detected to get the decoded_seq
demodulated=dem_PSK_or_QAM(in...
demodulated=demodulate_PSK_or...
demultiplex(r,map,puncture) Copyright 1998, Yufei Wu, MPRG lab, Virginia Tech. for academic use
depuncture(pun,punc_vector) Insert zeros into the punctured position of pun as specified by punc_vector
do_Hamming_code74(SNRbdB,MaxI...
encoderm(m,G,map,puncture) Copyright 1998, Yufei Wu, MPRG lab, Virginia Tech. for academic use
equalizer_in_freq(Y,H_est)
f5252(x,SNRb,b)
f5252_0(x,SNRb,b)
f=I0(beta) Bessel function of order 0
f=Rice_pdf(x,A,sigma) Rice density function
fine_CFO_estimate(tx,coarse_C...
g_code=gray_code0(g_code)
logmap(Ly,G,Lu,ind_dec) Copyright 1998, Yufei Wu, MPRG lab, Virginia Tech. for academic use
modulated=mod_PSK_or_QAM(in,b... Set Kg=1 to see the normal constellation diagram
modulated=modulate_PSK_or_QAM... Set Kg=1 to see the normal constellation diagram
p=Hermitp(N)
p=prob_error(SNRbdB,signaling... Finds the symbol/bit error probability for given SNRbdB (Table 7.1)
pemb_t=prob_err_msg_bit(et,N,...
phase_estimate=phase_from_pil... To estimate the phase offset based on the received pilot symbol
plot_MOD(T,lt,msg,modul,demod... plots AM signals and their spectra
puncture(un_pun, punc_vector) Puncture the bits of un_pun as specified by with punc_vector
qamseq=QAM(bitseq,b) 2^b-QAM modulation
rsc_encode(G,m,termination) Copyright 1998, Yufei Wu, MPRG lab, Virginia Tech. for academic use
set_CFO(tx,CFO,phase,Nfft,STO... CFO/phase = pseudo Carrier frequency/phase offset (pretended)
sim_SSB_AM(U_or_L) simulates USSB/LSSB-AM depending on the value of USSB_or_LSSB=0/1
sova(Ly,G,Lu,ind_dec) Copyright: Yufei Wu, 1998, MPRG lab, Virginia Tech for academic use
sym_vc=add_vc(symbol,pm)
sym_vc_removed=remove_vc(sym_...
th=principal_frequency(th,thl...
trellis(G) copyright 1998, Yufei Wu, MPRG lab, Virginia Tech for academic use
vhat=LDPC_decoder(H,Lcy) Performs an LDPC decoding with given parity-check matrix H and Lc*y
x=Alaw_inv(y,A,xmax)
x=cyclic_decoder0(r,N,K,g) Cyclic (N,K) decoding of an N-bit code r with generator polynomial g
x=deinterleaving(y,Nrow,Ncbps...
x=mulaw_inv(y,mu,xmax)
x=rD(t)
x=rD_wave(t)
x=tri(t)
x=tri_wave(t)
xl=rotate_l(x,M)
y=Q(x)
y=QAM4_slicer(x) To find one of 4-QAM symbols which is the closest to x
y=awgn_(x,SNRdB,sigpowerdB)
y=compensate_phase(x,phase) To compensate the received OFDM symbol x by phase deviation
y=deci2bin1(x,l) Converts a given decimal number x into a binary number of l bits
y=interleaving(x,Nrow,Ncbps,N...
y_dec=decoder(y,code_table)
z=corr_circular(x,y,N)
DS_SS.m
FH_SS.m
FH_SS2.m
LDPC_demo.m
cir09e05.m
dc0109_1.m
dc0109_2.m
dc01e01.m
dc01e03.m
dc01e16.m
dc01e17.m
dc01p02.m
dc02e02a.m
dc02e02b.m
dc02e03.m
dc02e05.m
dc02f05.m
dc02p01.m
dc0301_1.m
dc0301_2.m
dc040e03.m
dc0501.m
dc05f17.m
dc0701_1.m
dc07p01.m
dc09p07.m
do_BCH_BPSK_sim.m
do_CFO.m
do_CFO_PHO_STO.m
do_FSK_sim.m
do_MSK_sim.m
do_OFDM0.m
do_OFDM1.m
do_PNG.m
do_PSK_sim.m
do_QAM_sim.m
do_STO.m
do_STO_estimation.m
do_TCM_8PSK.m
do_Viterbi_QAM.m
do_ade.m
do_channel_estimation.m
do_cyclic_code.m
do_cyclic_codes.m
do_dfe.m
do_interleaving.m
do_mmsee.m
do_nonuniform_quantization.m
do_puncture.m
do_rcos1.m
do_rcos2.m
do_square_filter_clock.m
do_sync_for_DMB.m
do_sync_w_double_window.m
do_uniform_quantization.m
do_vector_quantization.m
do_vitdecoder.m
do_vitdecoder1.m
do_zfe.m
plot_ds_ss.m
quantize_nonuniform.m
quantize_uniform.m
set_parameter_11a.m
sim_ASK_bandpass_coherent.m
sim_ASK_bandpass_noncoherent.m
sim_DM.m
sim_DPCM.m
sim_DPSK_passband.m
sim_DSB_AMSC.m
sim_DSB_AMTC.m
sim_Delta_Sigma.m
sim_FM.m
sim_FSK_bandpass_coherent.m
sim_FSK_bandpass_noncoherent.m
sim_MSK.m
sim_OQPSK.m
sim_PCM.m
sim_PLL.m
sim_PM.m
sim_PSK_passband.m
sim_QAM_carrier_recovery.m
sim_QAM_passband.m
sim_QPSK_Costas.m
sim_QPSK_Costas_earlylate.m
sim_S_QDPSK.m
sim_TCM.m
sim_antipodal.m
sim_biorthogonal.m
sim_orthogonal.m
sim_squaring_loop.m
sim_sym_sync_earlylate.m
start_PSK_carrier_phase_timin...
test_DSTBC_G2_PSK.m
test_DSTBC_H4_PSK.m
test_Rayleigh_fading.m
test_corr_circular.m
test_encode_decode.m
test_unwrap.m
turbo_code_demo.m
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from MATLAB for Digital Communication by Won Yang
The MATLAB programs in "MATLAB/Simulink for Digital Communication" authored by Won Y. Yang et. al

y=awgn_(x,SNRdB,sigpowerdB)
function y=awgn_(x,SNRdB,sigpowerdB) [M,N]=size(x); if nargin<3, sigpowerdB = 10log10(sum(sum(x.^2))/(MN)); end y = x + 10^((????????????????)/??)*randn(size(x));

Highlights from MATLAB for Digital Communication

Highlights from
MATLAB for Digital Communication