OFDM vs. DSSS

[gisle_vanem]

How many frequencies are used in OFDM? And how

does this modulation relate to Spread Spectrum.

I mean what's the spreading factor gained with

OFDM vs. DSSS? If there are only 2 carriers, can

OFDM really be classified as "Spread Spectrum"?

[wong34539]

The Orthogonal Frequency Division Multiplexing (OFDM) used by the IEEE 802.11a uses a system of 52 subcarriers modulated by BPSK or QPSK and 16-quadrature amplitude modulation.