A High Data Rate Wireless Communication In Two-Level FH- CDMA Scheme

Frequency hopped code-division multiple access (CDMA) is mostly used for wireless communication systems as it has the flexibility to provide a variety of services to many users under different propagation conditions. With limited spectrum, an FH-CDMA wireless communication system is interference limited. Interference avoidance and interference averaging can reduce the interference of the system and increase the system capacity. Here ,we are used a “two-level” frequency hopping code-division multiple-access (FH-CDMA) scheme for wireless communication systems. The new scheme provides flexibility in the selection of modulation codes and FH patterns. By partitioning the modulation codes, our two-level scheme can be modified to support more possible users without increasing the number of FH patterns. The performance and spectral efficiency (SE) of the scheme are analyzed. Our results show that the partitioned two-level FH-CDMA scheme supports higher data rate and greater SE than Goodman’s frequency-shift-keying FH-CDMA scheme under some conditions. KeywordsCode division multiple access, code