Performance optimization of single frequency broadcast systems in FDD-CDMA cellular bands for wireless multimedia services

We study performance optimization of single frequency broadcast systems (SFBSs) spectrally underlaid in an FDD-CDMA cellular network which operates in a high frequency band (HFB) for the forward link and a low frequency band (LFB) for the reverse link. Interference scenarios between the cellular network and the SFBSs in both HFB and LFB are identified, and an interference analysis is presented to evaluate the received bit-energy-to-noise ratio (E_b/N_o). We also study a family of frequency allocation strategies for use by the SFBSs: (1) fixed channel allocation (FCA), (2) random channel allocation (RCA), and (3) distance based channel allocation (DBCA). The simulation results show that, in order to maximize the outage performance of the FDD-CDMA cellular network, and in the meantime to keep the outage performance of the SFBSs at an acceptable level, the DBCA with HFB as the inner tier and LFB as the outer tier should be adopted by the SFBSs given that D is properly adjusted. A good choice of D is to set D=0.76 at which acceptable outage performances of both FDD-CDMA cellular network and SFBSs can be achieved