difference btw OFDMA sub carriers and FFT

[okubote]

can anyone explain to me the difference btw OFDMA sub carriers and FFT?

how do i implement in matlab, how 1024 subcarriers are distributed/divided among three sub channelization with the pilot subcarrier in each of the sub channelization for 300 users?

I will really appreciate any help rendered. Thanks in advance

 

[jahmad]

Can you please provide more info, what OFDMA standard are you talking? You need to know the pilot distribution, number of users, active and virtual carriers etc.

 

[seng]

FFT is including data subcarriers, pilot subcarriers and null carriers. OFDMA subcarriers mean data subcarriers + pilot subcarriers.

 

[Naveed Alam]

can anyone explain to me the difference btw OFDMA sub carriers and FFT?

how do i implement in matlab, how 1024 subcarriers are distributed/divided among three sub channelization with the pilot subcarrier in each of the sub channelization for 300 users?

I will really appreciate any help rendered. Thanks in advance

Subcarrier belong to OFDM not to OFDMA. in OFDM at transmitter side, subcarriers are formed using IFFT and at receiver FFT process is used to recover it. OFDMA is the access technique of OFDM process.
If you find matlab code of Eric Cosby from somewhere, it will help you a lot. This code doesn't have pilots neither guard interval; but you can edit the code accordingly.
Your question of 300 users, seem to be about OFDMA; someone alse must answer it, i m not very sure about it.


Naveed

 

[okubote]

i am to implement or write a matlab code for 1024FFT, 10M bandwidth OFDMA FUSC subchannel configuration in 802.16e. the bandwidth is divided into 16 sub channels with each sub channel comprising of 48 sub carriers.

Your help will be highly appreciated. thanks