frequency selective fading for OFDM
Started by ●March 25, 2005
hii all,
I am trying to make a simulation program for OFDM.My
modulation technique is BPSK.after doing the mapping of original to
BPSK signal space, I am taking say N of those symbols and performing
IFFT(I conjugate and append my BPSK data set so as to obtain a real
signal out of the IFFT block).Now my problem goes like this-
1) how do i model a frequency selective slow fading which will
corrupt my signal coming out of IFFT.
2)Do I just need to consider the envelop of the fading model for BPSK
3)if I use say,QPSK, do I need to consider the phase component of the
fading model as well?
please suggest
thanks and regards
# if any one has matlab codes for the same, please send them
nish!
Reply by ●March 27, 20052005-03-27
Hi Nishchal,
i did the same project in the last mid year
vacation ... i remember that when i made the freuency
selective we made random generation of a sequence with
the same length of the data & add each element in this
array to its equivalent element in the signal .... try
this method ....
*************************************
Ahmad M. El-Saied
Faculty of Engineering
Cairo Univesity
Electronics & Electrical Communication Dep.
--- nishchal chaudhary <kantrinish@kant...> wrote:
--------------------------------- hii all,
I am trying to make a simulation program for
OFDM.My
modulation technique is BPSK.after doing the mapping
of original to
BPSK signal space, I am taking say N of those symbols
and performing
IFFT(I conjugate and append my BPSK data set so as to
obtain a real
signal out of the IFFT block).Now my problem goes like
this-
1) how do i model a frequency selective slow fading
which will
corrupt my signal coming out of IFFT.
2)Do I just need to consider the envelop of the fading
model for BPSK
3)if I use say,QPSK, do I need to consider the phase
component of the
fading model as well?
please suggest
thanks and regards
# if any one has matlab codes for the same, please
send them
nish! To
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