Space-time codes over PN sequences for DS/CDMA systems

This paper considers the application of space-time coding techniques in DS/CDMA communication systems with multiple transmit antennas. Space-time codes are constructed over the set of possible pseudo noise (PN) sequences rather than standard 2-D signals. Several design examples of these codes with different sequences and slates are presented and possible methods of implementation are suggested. Simulation results indicate that the proposed space-time coded systems provide a significant performance improvement over the reference transmit diversity system. The performance improvement is more pronounced when two receive antennas are employed and grows as the data alphabet M grows.