Performance of a Hybrid TDD-CDMA System with Random Slot Allocation (RSA) in Comparison with an Equivalent FDD-CDMA System

This paper proposes a hybrid form of ad-hoc networking where the public network frequency and technology is re-used to establish an ad-hoc network. The proposed technology is TD-CDMA, which will be used for both public and ad-hoc in the same frequency band. In particular, this paper treats the performance difference between a hybrid public & ad-hoc TDDCDMA system employing random slot assignment, an equivalent TDD-CDMA system without any extra ad-hoc interference and an equivalent FDD-CDMA system. It will be shown that the additional interference on the hybrid system caused by the private ad-hoc network is minimal. Furthermore, it will be demonstrated that the performance of the hybrid TDD system outperforms the FDD mode.