Abstract

According to the characteristic of high altitude platform stations (HAPS), the capacity calculation formulas for MF-CDMA and MF-TDMA schemes are deduced with the key factors of user information rate, frequency band available, interference factor, required E_b/I₀ and frame efficiency etc. Theory analysis and simulation results indicate that the service type and the required E_b/I₀ have a major impact on the capacity of MF-CDMA scheme, and the capacity of MF-TDMA scheme has the relationship with the modulate level and the frame efficiency. A comparison between the two multiple access schemes shows that for voice service the capacity of MF-CDMA schemes is superior to that of MF-TDMA schemes, while for a high threshold of E_b/I₀ MF-TDMA schemes has advantage over MF-CDMA schemes in capacity.

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