Patent ID: 6070086
Filing Date: 2000-05-30
Classification: H04B,H04W

Abstract:
In a cellular mobile telephone system in which system users communicate information signals between one another using code division multiple access spread spectrum communication signals, a closed loop power control unit which is coupled to respective cell-site transmitter/receiver, the closed loop power control unit comprising:means for measuring EbIo (the ratio of signal energy per bit to the interference power spectral density) wherein said means for measuring EbIo further comprises:means for hard-deciding data,first estimation means for estimating EbIo based on data symbols and pilot symbols,second estimation means for estimating EbIo based on said pilot symbols,means for estimating error rate, andmeans for selecting an output of one of said first estimation means and said second estimation means based upon an output of said means for estimating error rate,wherein inserted known symbols and/or pilot symbols are used for estimating carrier and estimating EbIo; andmeans for generating power adjustment commands corresponding to a deviation in the measured EbIo from a predetermined EbIo level, wherein coherent detection schemes are used for reverse link (mobile to cell) in said cellular mobile telephone system, andwherein a mobile station is capable of receiving said power adjustment commands and adjusting its transmission signal power in correspondence to said power adjustment commands.