Time of Arrival Estimation in Probability-Controlled Generalized CDMA Systems

In recent years, more and more wireless communications systems are required to provide also a positioning measurement. In Code Division Multiple Access (CDMA) communication systems, the positioning accuracy is significantly degraded by the Multiple Access Interference (MAI) caused by other users in the system. This MAI is commonly managed by a power control mechanism, and yet, MAI has a major effect on positioning accuracy. Probability control is a recently introduced interference management mechanism. In this mechanism, a user with excess power chooses not to transmit some of its symbols. The information in the non-transmitted symbols is recovered by an Error-Correcting Code (ECC), while all other users receive a more reliable data during these quiet periods.