code for OFDM signal transmission and reception in AWGN channel

%code for OFDM signal transmission and reception in AWGN channel

n = 256; % Number of bits to process

x = randi(n,1); % Random binary data stream

M = 16; % Size of signal constellation

k = log2(M); % Number of bits per symbol

xsym=bi2de(reshape(x,k,length(x)/k).','left-msb');

% Convert the bits in x into k-bit symbols.

y = modulate(modem.qammod(M),xsym); % Modulate using 16-QAM.

tu=3.2e-6;%useful symbol period

tg=0.8e-6;%guard interval length

ts=tu+tg;%total symbol duration

nmin=0;

nmax=64;%total number of subcarriers

scb=312.5e3;%sub carrier spacing

fc=3.6e9;%carrier frequency

Rs=fc;

tt=0: 6.2500e-008:ts-6.2500e-008;

c=ifft(y,nmax);%IFFT

s=real(c'.*(exp(1j*2*pi*fc*tt)));%bandpass modulation

figure;

plot(real(s),'b');title('OFDM signal transmitted');

figure;

plot(10*log10(abs(fft(s,nmax))));title('OFDM spectrum');

xlabel('frequency')

ylabel('power spectral density')

title('Transmit spectrum OFDM');

snr=10;%signal to noise ratio

ynoisy = awgn(s,snr,'measured');%awgn channel

figure;

plot(real(ynoisy),'b');title('received OFDM signal with noise');

z=ynoisy.*exp(1i*2*pi*fc*tt);%Bandpass demodulation

z=fft(z,nmax);%FFT

zsym = demodulate(modem.qamdemod(M),z);%demodulation of bandpass data

z = de2bi(zsym,'left-msb'); % Convert integers to bits.

z = reshape(z.',numel(z),1);%matrix to vector conversion

[noe,ber] = biterr(x,z) ;%BER calculation

figure;

subplot(211);stem(x(1:256));

title('Original Message');

subplot(212);stem(z(1:256));

title('recovered Message');

After running the above code i got error as below:

Error in behavof_ofdm (line 7)

xsym=bi2de(reshape(x,k,len(x)/k).','left-msb');

[Akram Kareem]

not working:

Error using reshape

Size arguments must be real integers.