Patent ID: 6822508
Filing Date: 2004-11-23
Classification: H04B

Abstract:
A communication device for communicating with a plurality of communication terminals in a multiple-access communication system, comprising:correlation calculation means for calculating a correlation between a received signal including a plurality of signals respectively transmitted from the plurality of communication terminals using ultra-wideband (UWB) communication waveforms and local pulses at possible positions in the respective signals transmitted from each of the plurality of communication terminals; interference canceling means for removing a multiple-access interference among the plurality of signals transmitted from the plurality of communication terminals from the calculated correlation; and demodulation means for demodulating data transmitted from each of the plurality of communication terminals based on an output from the interference canceling means, wherein the demodulation means demodulates data by detecting one of a suboptimum symbol and a suboptimum symbol sequence based on the calculated correlation and the multiple-access interference among the plurality of signals transmitted from the plurality of communication terminals, and the demodulation means includes inverse correlation calculator means for making a conversion of the calculated correlation using an inverse matrix of a correlation matrix indicating the correlation among the pulses at possible positions in the respective transmitted signals; and detection means for detecting one of the suboptimum symbol and the suboptimum symbol seguence based on the output of the inverse correlation calculator means.