In all the detail on DSSS and OFDM, I have missed which characterics of DSSS and OFDM make these distinct technologies. Nothing I've read appears to contrast the two.
As I understand it, both DSSS and OFDM are intended to send many bits in parallel. DSSS spreads data across a channel for redundancy, and the books say that bits are sent in parallel. OFDM divides a channel into "subcarriers" and likewise sends bits in parallel. This might suggest the main difference between the two, that DSSS somehow sends data in parallel on a single carrier, whereas OFDM accomplishes this with multiple carriers. Either way, both take up more bandwidth than 1 signal, so I don't get how they're much different.
What should a network engineer know, about how DSSS and OFDM are fundamentally different from each other?
Update: According to the current CWNA book, OFDM is not a spread spectrum technology.