Microcellular CDMA mobile communications, in frequency overlay situations
The code-division multiaccess (CDMA) network is assumed to share a common spectrum with various narrowband microwave users. An interference suppression filter at each CDMA receiver is used to reject the narrowband interference. The problem of interference from adjacent cells is also considered. Average power control is assumed to combat the, near/far problem, and multipath diversity, in conjunction with simple interleaved channel coding, is considered for improving the performance of the CDMA system. Numerical results illustrate, at a given bit error rate (BER), the number of users supported by the CDMA system as the propagation loss exponent increases. When the ratio of the narrowband interference power to the desired signal power (J/S) is small with respect to the multiple access and adjacent-cell interference, the suppression filter is unnecessary, whereas when J/S is on the order of the interference, use of the suppression filter yields a significant improvement in performance.<<ETX>>