Different channel coding strategies for OFDM-CDMA

The performance of different channel coding schemes are presented for an OFDM-CDMA system. The different channel coding schemes are shown for a receiver using equal gain combining on the carriers in a multipath channel. As such the only information needed at the receiver is the phase of the sub-carriers. Two new channel coding schemes for OFDM-CDMA are presented, orthogonal and super orthogonal convolutional coding. These are compared against a 1/2 rate K=7 convolutional code and a 3/4 rate K=7 punctured convolutional code. A comparison is made of the spectral efficiency of the different coding schemes, the bandwidth required and the receiver complexity tradeoffs.