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 Send instant messages to your online friends http://uk.messenger.yahoo.com

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!