能否给出源程序，不甚感激。

我有本书讲OFDM的MATLAB方针(电子版)。。。

有机会上传到FTP上。。。

呵呵,误会...

不是我写的...

我下一本书...

这里牛人太多了...

牛眼里边看的,可能都是牛人吧...

%

% FUNCTION 2.10 : "cp0203_qpsk_mod"

%

% This function receives a binary stream in input ('bits')

% and returns the corresponding sequence of QPSK symbols

%  ('S'),

% plus the two sequences 'Sc' and 'Ss' containing the real

% and imaginary part of each symbol

%

% Programmed by Guerino Giancola

%

function [S,Sc,Ss] = cp0203_qpsk_mod(bits)

nb = length(bits);      % number of bits

ns = ceil(nb/2);        % number of symbols

b0 = zeros(1,ns*2);     % zero padding

b0(1:nb) = bits;

j = sqrt(-1);

for s = 1 : ns

ba = b0(((s-1)*2)+1);

bb = b0(((s-1)*2)+2);

k = bb + ba*2;

p = ((pi/4)*(2*k-1))-pi;

Sc(s) = cos(p);

Ss(s) = sin(p);

S(s) = Sc(s) + j*Ss(s);

end

%

% FUNCTION 2.11 : "cp0203_OFDM_qpsk"

%

% Simulation of a transmitter implementing

% the OFDM transmission chain with QPSK modulation

% on each sub-carrier

%

% 'numbits' is the number of bits generated by the source

% 'fp' is the carrier frequency of the generated signal

% 'fc' is the sampling frequency

% 'T0' is the block length in [s], i.e., 1/T0 is the carrier

%  separation

% 'TP' is the length of the cyclic prefix [s]

% 'TG' is guard time

% 'A' is the amplitude of the rectangular impulse response

%  [V]

% 'N' is the number of carriers (tones) used in the OFDM

%  system

%

% The function returns:

% 1) the generated stream of bits ('bits')

% 2) the corresponding stream of QPSK symbols ('S')

% 3) the I component of the generated signal ('SI')

% 4) the Q component of the generated signal ('SQ')

% 5) the generated OFDM signal ('Stx')

% 6) the value of the sampling frequency ('fc')

% 7) the value of the carrier frequency ('fp')

% 8)9)10) the values of T0, TP, and TG

% 11) the number of tones used for transmission

%

% Programmed by Guerino Giancola

%

function [bits,S,SI,SQ,Stx,fc,fp,T0,TP,TG,N] = ...

cp0203_OFDM_qpsk;

% ----------------------------

% Step Zero - Input parameters

% ----------------------------

numbits = 1024;      % number of bits to be transmitted

fp = 1e9;            % central frequency

fc = 50e9;           % sampling frequency

T0 = 242.4e-9;       % information length

TP = 60.6e-9;        % cyclic prefix

TG = 70.1e-9;        % total guard time

A = 1;               % amplitude of the rectangular impulse

% response

N = 128;             % number of carriers of the OFDM

% system

% -------------------------

% Step One - OFDM modulator

% -------------------------

tc = T0 / N;            % chip time

ntcp = floor(TP/tc);    % number of tones of the cyclic

% prefix

n = (-ntcp+1:1:N);      % tone counter

NT = length(n);         % total number of tones per symbol

% Bit generation

bits=rand(1,numbits)>0.5;

% QPSK modulator

[S,Sc,Ss] = cp0203_qpsk_mod(bits);

% OFDM modulator

nb = ceil(length(S)/N);      % number of OFDM blocks to be

% transmitted

S0 = zeros(1,nb*N);          % zero padding

S0(1:length(S))=S;

dt = 1 / fc;                 % sampling period

if ntcp>0

tc = (T0+TP)/NT;         % tone duration

end

tonesamples = floor(tc/dt);  % samples per tone

toneres = floor((TG-TP)/dt); % samples for the residual

% part

symsamp = (tonesamples*NT)+toneres;

% number of samples representing one OFDM symbol

totsamp = symsamp * nb;

% number of samples representing the transmitted signal

X = [zeros(1,totsamp)'];

for b = 1 : nb

% Serial to Parallel conversion and zero padding

c = S0((1+(b-1)*N):(N+(b-1)*N));    % block extraction

A = length(c);

a1 = floor(A/2);

a2 = A - a1;

FS = 2*A;

Czp=zeros(FS,1);

Czp(1:a1)=[c(1:a1).'];

Czp(FS-a2+1:FS)=[c(A-a2+1:A).'];

C = ifft(Czp);  % IFFT of the zero-padded input

if ntcp>0 % insertion of the cyclic prefix

C1=zeros(length(C)+2*ntcp,1);

C1(1:(2*ntcp))=C(2*N+1-(2*ntcp):2*N);

C1(2*ntcp+1:length(C1))=C;

else

C1=C;

end

%

zp = floor(tonesamples/2);

C2 = [C1.';zeros((zp-1),length(C1))];

C3 = C2(:);

g = ones(1,zp);

C4 = conv(g,C3);

C4 = C4(1:(zp*NT*2));

ics = 1 + (b-1)*symsamp + toneres;

X(ics:ics+length(C4)-1)=C4;

end % for b = 1 : nb

XM = X';                % Parallel to Serial conversion

XM = XM(1:totsamp);

I = real(XM);

Q = imag(XM);

% carrier modulation

time = linspace(0,totsamp*dt,length(I));

SI = I(cos((2*pi*fp)time));

SQ = Q(sin((2*pi*fp)time));

Stx = SI - SQ;

谢谢大家了！