designing 2 bandpass filters in matlab to be used in fpga

hi to all. i have a project in which I have to demodulate a fsk-modulated signal that comes from a adc which samples at 5mHzin fpga. to do that, I have to design two bandpass filters at 690 kHz and 710 kHz. Now I am trying to simulate it in matlab to make sure it works. this is my code:
close all;
%clear;
% find the period of the transmitted sine waves in ns
period_of_710 = ceil(1000000000/710000);% ns
period_of_690 = ceil(1000000000/690000);% ns

% create a 1 period signal of each waveform perhaps for some filtering
%operations
s690KHZ = sin([2*pi/period_of_690:2*pi/period_of_690:2*pi]);
s710KHZ = sin([2*pi/period_of_710:2*pi/period_of_710:2*pi]);

figure, plot(s690KHZ);
figure, plot(s710KHZ);


% create a band filter for each waveform
bp_690 = ones(1,length(s690KHZ));
bp_710 = ones(1,length(s710KHZ));
lp_dum = ones(1,100);
figure, plot(bp_690);


% the duration of each symbol at the time of transmission in ns
sym_period = 10000;


% create a pattern to be transmitted that is made of 1's and 0's
input = [1 0 0 1 1 0 1];

% now create the symbols for transmitting 1 and 0. e.g. if you want to
% transmit a 1 then you have to transmit a 690 KHz sine wave in sym_period
% of time length
tx_1 = sin([2*pi/period_of_690:2*pi/period_of_690:2*pi*sym_period/period_of_690]+0.75*pi);
tx_0 = sin([2*pi/period_of_710:2*pi/period_of_710:2*pi*sym_period/period_of_710]+0.75*pi);
%tx_1 = sin([2*pi*(710/2500)/period_of_690:2*pi*(710/2500)/period_of_690:2*pi*(710/2500)*sym_period/period_of_690]+0.75*pi);
%tx_0 = sin([2*pi/period_of_710*(690/2500):2*pi/period_of_710*(690/2500):2*pi*(690/2500)*sym_period/period_of_710]+0.75*pi)

figure, plot(tx_1);
figure, plot(tx_0);

% create the final transmitted wave by looking at the "input" register
for ii = 1:length(input)
if input(ii) == 1
tx((ii-1)*sym_period+1 : ii*sym_period) = tx_1;
else
tx((ii-1)*sym_period+1 : ii*sym_period) = tx_0;
end
end

figure,plot(tx);

%create a noise pattern.
noise = sqrt(0)*randn(1,length(tx));


% written for matched filtered
% filter_690 = imfilter(tx,s690KHZ);
% filter_710 = imfilter(tx,s710KHZ);

% obtain the received signal by adding the noise to the transmitted signal
rx = tx+noise;

% band-pass filter the incoming signal
%filter_690 = imfilter(rx,bp_690);
%filter_710 = imfilter(rx,bp_710);
filter_690 = filter(Hd0,rx);
filter_710 = filter(Hd1,rx);
figure,plot(filter_690);
title('filter_ 690');
figure,plot(filter_710);
title('filter_ 710');

% apply matched filter to the band-passed signal.
%matched_690 = imfilter(filter_690,s690KHZ);
%matched_710 = imfilter(filter_710,s710KHZ);


% written for the power matched filtered wave
% filter_690_kare = filter_690.*filter_690;
% filter_710_kare = filter_710.*filter_710;

%observe the power of the filtered waveform
%filter_690_kare = matched_690.*matched_690;
%filter_710_kare = matched_710.*matched_710;
filter_690_kare = filter_690.*filter_690;
filter_710_kare = filter_710.*filter_710;
figure,plot(filter_690_kare);

when I use "imfilter" function It works properly (the signal is processed well) but when I try to use a filters designed in fdatool (Hd0 and Hd1 in this case), it doesnt work. I dont understand why. I am sure it is not about the order of the filters. I have to see it working with filters because I will have to use these filters' coefficents in fpga.
these are the properties of the filters that I designed in fdatool:
order:128,
fir least-squares
PersistentMemory: 0
NumSamplesProcessed: 0
FilterStructure: 'Direct-Form FIR'
States: [128x1 embedded.fi]
Numerator: [1x129 double]
Arithmetic: 'fixed'
CoeffWordLength: 8
CoeffAutoScale: 1
Signed: 1
RoundMode: 'convergent'
OverflowMode: 'wrap'
InputWordLength: 8
InputFracLength: 15
NumFracLength: 14
FilterInternals: 'FullPrecision'
OutputWordLength: 21
OutputFracLength: 29
ProductWordLength: 15
ProductFracLength: 29
AccumWordLength: 21
AccumFracLength: 29
sampling freq: 5MHz
for 710 KHz:
fstop1: 700kHz
fpass1: 706kHz
fpass2:715kHz
fstop2:720kHz

for 690 KHz :
fstop1: 680kHz
fpass1: 685kHz
fpass2:695kHz
fstop2:700kHz

any help will be very appreciated.