Patent ID: 6865219
Filing Date: 2005-03-08
Classification: H04B

Abstract:
1. An apparatus for performing circular group-wise parallel interference cancellation in CDMA system that includes a plurality of detectors connected in parallel, each of the detectors including a plurality of fingers receiving signals, estimating a power of the received signal, outputting the estimated power, and demodulating the received signal on a corresponding path; and a maximal ratio combiner combining the received signal on each path demodulated by the fingers according to a maximal ratio combining method, and outputting soft bit decision value, the apparatus comprising: a rank decision part receiving the soft bit decision value of the maximal ratio combiner of each detector and the power estimation value of the received signal generated by each finger of each detector, and determining the rank of the received signal of each path; and a finger selector receiving a rank decision signal generated by the rank decision part, and outputting a signal for selecting a predetermined number of fingers, wherein the fingers selected by the finger selector generate and output base band signals of the received signal on the corresponding path, and the base band signals generated from the selected fingers are added to obtain a sum value of the base band signals, the sum value is subtracted from the received signal to perform the group-wise interference cancellation.