Multicarrier FH codes for multicarrier FH-CDMA wireless systems

A multicarrier (multihopping) scheme for multilevel frequency-shift keying/frequency-hopping code-division multiple access (MFSK/FH-CDMA) systems is proposed. In order to improve the frequency diversity capability for the proposed multicarrier MFSK/FH-CDMA system, several hopping frequencies per time slot are employed and transmitted in parallel. The frequency band is partitioned into N (N/spl les/P, P is a prime number) disjoint subbands on which N hop carrier frequencies are simultaneously transmitted. In previous work on multicarrier systems, it has been assumed that the hopping frequencies of N disjoint subbands are identical. We consider the FH patterns without this assumption. These FH patterns have cross correlation no greater than one in order to minimize mutual interference. In addition, we analyze the performance of the system in order to show the improvement of user capacity. Our results show that the proposed scheme performs better than the conventional one in both nonfading and fading channels.