On the duality of multi-carrier spread spectrum and single-carrier transmission

The combination of orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) has found great interest during the last few years. Several ways of combination have been discussed in the literature, named as MultitoneCDMA (MT—CDMA) [1], Multi—Carrier DS—CDMA [2] and Multi—Carrier or OFDMCDMA [3, 6]