A framework for throughput and stability analysis of a DS-CDMA network

摘要

We propose a framework for throughput and stability analysis of a Direct Sequence Code Division Multiple Access (DS-CDMA) network. Given chip rate, processing gains, packet structure, coding scheme, and the characteristics of the wireless channel, we derive a system of non-linear fixed point equations for the sustainable link bit rates. The dimension of this system is equal to the number of network nodes receiving transmissions from other nodes. Generally, this non-linear system may have multiplelocally stable solutions which indicates a possible instability of the DS-CDMA network because the persistent link bit rates may depend on the initial link loads. As an example, we consider throughput and stability of the reverse link in a cellularsystem, i.e., from mobiles to the base station. A reverse link is described by a single fixed point equation regardless of the number of mobiles.