Cell design for a broadband CDMA personal communications network

The results of field tests consisting of propagation measurements using broadband code division multiple access (B-CDMA) waveforms are described. B-CDMA operates in the 1850-1990 MHz frequency band. The spreading code rate is 24 Mchips/s, which occupies a bandwidth of 48 MHz. With this wide bandwidth, fading due to multipath propagation is minimized, since the bandwidth is much wider than the coherence bandwidth of the fade. Link loss measurements were taken between a B-CDMA transmitter and a mobile user, located at various indoor and outdoor points throughout the region of interest. Using these data, loci of constant link loss were plotted on a regional map. An analysis was performed which relates the number of personal communications network users, the power transmitted, and the link loss. Using the graph obtained from this analysis and the loci constant link loss obtained from the experiments, appropriate cell size and system design information are obtained.<
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