Channel estimation in cdma communications systems using both lower power pilot channel and higher power date channel

摘要

An iterative arrangement of channel estimator ( 12 ), a Kalman filter unit ( 14 ), and a soft demodulator ( 16 ) is provided for producing an estimate of complex gain of a CDMA communications channel carrying data and pilot channels, and demodulated data of the data channel. An initial channel estimate is produced by the estimator ( 12 ) using only the low-power pilot channel. This later is improved by the iterative process using the data channel. The complex gains is represented by a sum of sinusoidal signals with different frequencies and randomly variable amplitude and phase.