초록 ▼

A first EbIo estimator calculates EbIo using samples corresponding to data symbols and samples corresponding to pilot symbols. A diversity combined signal, which is obtained by coherent maximal ratio combining of paths signals is provided for the data symbol hard decisions. The data symbol hard deci

A first EbIo estimator calculates EbIo using samples corresponding to data symbols and samples corresponding to pilot symbols. A diversity combined signal, which is obtained by coherent maximal ratio combining of paths signals is provided for the data symbol hard decisions. The data symbol hard decisions are used in EbIo measurement. The calculation for signal power uses re-modulation. The re-modulation is based on provided carrier signals. The carrier signal is derived using interpolated pilot symbols. The calculation for interference power uses a difference between a received signal and a re-modulated signal. A second EbIo estimator calculates EbIo using only samples corresponding to the pilot symbols. A rough error rate estimation uses the hard decisions for pilot samples and their comparison with known pilot symbols. If an estimated error rate is less than a predetermined threshold, the EbIo measured by first EbIo estimator is used for power control. When the estimated error rate is larger than the threshold, the EbIo measured by second EbIo estimator is used to control the power. The selection between the first and second EbIo estimator is for each slot EbIo measurement. The measured EbIo is compared with the preset EbIo threshold level, and as a result of this comparison, a command to lower or raise power is sent to the mobile station using the return channel.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.