Does OFDM change the bandwidth , spectral efficiency and BER ?

[makanaky]

Hi,

I have a question about OFDM :

Does OFDM change the bandwidth , spectral efficiency and BER ?

For Example : Does QPSK OFDM have same bandwidth , spectral efficiency and BER as QPSK or does it differ ?

Thanks

 

[Ahmed Alaa]

Re: questionn about OFDM

Bandwidth is reduced due to overlapping spectra of different subcarriers in frequency domain. Regarding BER, in AWGN, you'll find that the BER is nearly the same but in fading channels, it depends on the equalization technique you're using.