METHOD AND APPARATUS FOR DETERMINING THE NECESSITY OF TRANSMISSION OF A PRIMARY AND A SECONDARY PILOT CHANNEL AND IMPROVEMENT OF CHANNELESTIMATION

摘要

A method and apparatus provides for efficient data rate control and power control processes by transmitting a primary and a secondary pilot channel associated with a data channel. The primary and secondary pilot channels are used to improve the SNR-Signal to noise Ratio-, reference phase and amplitud e estimates by combining them for the decoding of the data on the data channel . A ratio of power levels of the primary and secondary pilot channels is based on at least one of the data rate and payload size of the data channel. The power level of the primary pilot channel is maintained independent of at lea st one of data rate and payload size of the data channel. The power level of th e secondary pilot channel may be adjusted based on at least one of data rate a nd payload size of the data channel. Based on the comparison between the calculated data rate of the data channel and a predetermined value, a determination is done, whether the transmission of the primary and the secondary common pilot channel is necessary.