CHANNEL ESTIMATION FOR A CDMA SYSTEM USING PRE-DEFINED SYMBOLS IN ADDITION TO PILOT SYMBOLS

摘要

SYSTEMS AND METHODS FOR IMPROVED CHANNEL ESTIMATION FOR A WCDMA SYSTEM. IN A RAKE RECEIVER, PREDEFINED PILOT SYMBOLS AND A TRANSMITTER POWER CONTROL (TPC) SYMBOL ARE RECEIVED IN A TIME SLOT AND CORRELATED TO DETERMINE THE TRANSMITTED PREDEFINED PILOT SYMBOLS AND THE TRANSMITTED TPC SYMBOL. THE CORRELATED PREDEFINED PILOT SYMBOLS AND THE CORRELATED TPS SYMBOL ARE COMPARED TO THE TRANSMITTED PREDEFINED PILOT SYMBOLS AND TPC SYMBOL. BASED UPON THE DIFFERENCE BETWEEN THE RECEIVED VERSION AND CORRELATED VERSION OF THE SYMBOLS AN ESTIMATION OF CHANNEL IMPAIRMENTS CAN BE CALCULATED. BASED UPON THE ESTIMATION THE RECEIVED DATA SYMBOLS MAY BE MORE ACCURATELY CORRELATED TO THEIR CORRECT VALUES.(FIG. 1)