This paper is concerned with the capacities of spectrally overlaid narrow-band and wide-band systems using two code-division multiple-access (CDMA) techniques: a single-code and a multicode. The capacity is defined here as the maximally achievable total throughput in the narrow-band and wide-band subsystems. User signal power in the overlay systems affects the performance of the systems. The signal power is characterized as the relative power level of wide-band and narrow-band users according to the spreading bandwidth, spectral overlay ratio, and the number of spreading codes assigned to a user in single- and multiple-cell environments. The capacities of the overlay systems are then analyzed. The results of the analysis show that the single-code technique yields better performance than does the multicode scheme in terms of the capacities of the overlay systems. Furthermore, the use of a multicode technique for wide-band subsystems and a single-code scheme for narrow-band subsystems is desirable for enhancing the performance of CDMA overlay systems.
KSP Keywords
CDMA systems, Code division Multiple Access(CDMA), Multicode CDMA, Narrow band, Power Levels, Relative power, Wide band, signal power, spreading code, total throughput
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