Performance analysis of high-speed packet data in an integrated voice/data CDMA system

In order to support high data-rate service in an integrated CDMA system, it is required to allocate resources for data users in the consideration of high spectral efficiency. The author analyses the performance of a simultaneous resource allocation (SRA) scheme and a dedicated resource allocation (DRA) scheme in the reverse link of an integrated voice/data CDMA system. In the DRA scheme, the throughput of data users can be maximised when one user among data users is allowed to transmit information at any given time. Using the DRA scheme, resources for data users are allocated with high spectral efficiency. To apply this scheme to an integrated voice/data CDMA system, resources are first allocated to voice users and then residual resources are allocated to data users based on the throughput maximisation strategy. For a more practical approach, the transmission power of the mobile station (MS) is assumed to be limited. Owing to this assumption, the performance of SRA and DRA schemes is varied according to the location of the MS. The performance is also shown under perfect power control and imperfect power control. In order to verify the analysis results, the simulation was performed under the same environment. Simulation and analysis results show that the DRA scheme has higher throughput than the SRA scheme under the conditions that the mobile is located in a limited cell coverage and the variation of E_b/N₀ is minimised.