System for estimating data using iterative fast fourier transform error correction

摘要

A system for estimating data from a received plurality of data signals in a code division multiple access communication system. The data signals are transmitted in a shared spectrum at substantially the same time. A receiver receives a combined signal of the transmitted data signals and a sampling device samples the combined signal. A channel estimating device estimates a channel response for the transmitted data signals. A data detection device estimates data of the data signals using the samples and the estimated channel response. The data estimation uses a Fourier transform based data estimating approach. An error in the data estimation introduced from a circulant approximation used in the Fourier transform based approach is iteratively reduced.