Blind rate detection for multirate UMTS DS-CDMA signals

The problem of blind data rate detection for a multi-rate direct-sequence code-division multiple-access system is addressed. The system model is based on the time-division duplex mode of the UMTS standard. A host of blind algorithms based on or inspired by maximum likelihood principles are investigated. Rate detectors with implicit or explicit multiple access interference (MAI) suppression are considered. Based on the MAI suppression filter, additional rate detectors are devised. It is seen through simulation results that the best complexity and performance tradeoff is achieved by evaluating the “energy” at the output of the MAI suppression filter associated with the candidate rate