Science & Engineering Research Support soCiety (SERSC)
In this paper, the authors consider a hybrid Direct-Sequence Frequency-Hopped (DS/FH) Code Division Multiple Access (CDMA) communication system, where the transmission power and data rate are adapted relative to the channel variation. Instead of random frequency hopping, hopping pattern is adaptively adjusted to obtain the maximum channel gain among available frequency slots. Transmission power and/or data rate are also adapted such that a target transmission quality is maintained. It is shown that the proposed scheme provides a higher average data rate than pure DS/CDMA with power and rate adaptations, subject to the identical average trans-mission power and bandwidth constraints.