IMPROVEMENT OF BIT ERROR PROBABILITY BEPS OF THE TWO LEVEL FH CDMA SCHEME FOR WIRELESS COMMUNICATION SYSTEMS OVER NOISY CHANNEL
In this project, we propose a "two level" frequency hopping code division multiple access (F HCDMA) scheme for wireless communication systems. Th e new scheme provides flexibility in the selection of modulation codes and FH patterns. By partitioning t he modulation codes, our two level scheme can be modified to support more possible users without inc reasing the number of FH patterns. The performance and spectral efficiency (SE) of the scheme are analyzed Our results show that the partitioned two level FHCDMA scheme supports higher data rate and greater S E than Goodman's frequency shift keying FHCDMA scheme under some conditions.