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 p roposed. In order to improve the frequency diversity capability for the pro posed multicarrier MFSK/FH-CDMA system, several hopping frequencies per tim e slot are employed and transmitted in parallel. The frequency band is part itioned into N (N less than or equal to P, P is a prime number) disjoint su bbands on which N hop carrier frequencies are simultaneously transmitted, I n previous work on multicarrier systems, it has been assumed that the hoppi ng frequencies of N disjoint subbands are identical. We consider the PH pat terns 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 u ser capacity. Our results show that the proposed scheme performs better tha n the conventional one in both nonfading and fading channels.