Patent ID: 7636407
Filing Date: 2009-12-22
Classification: H04B,H04L

Abstract:
1. A signal detector arranged in a receiver of a wireless communication device used in a wireless communication environment in which a plurality of wireless communication devices communicate with each other using different signal bandwidths and different carrier frequencies, the signal detector comprising: a variable passband bandpass filter configured to suppress out-of-band signals in a received signal using a variable passband and output a band limited signal; a signal parameter detection unit configured to detect a signal parameter of each of a plurality of signals contained in the received signal; a detection order determination unit configured to determine a detection order for detecting said plurality of signals contained in the received signal based on the signal parameter; a parameter control unit configured to control the passband of the variable passband bandpass filter based on the detection order and the signal parameter; and an equalization and decision unit configured to equalize and decide on the bandlimited signal output from the variable passband bandpass filter, said plurality of signals contained in the received signal being successively detected from the received signal according to the detection order by way of the variable passband bandpass filter and the equalization and decision unit; a replica generator configured to generate a replica of the received signal using a decision result and a channel estimation value each produced by the equalization and decision unit, wherein the signal detector has multiple stages of signal detection in succession, each stage being defined by a combination of the variable passband bandpass filter, the equalization and decision unit, and the replica generator, and at each particular stage, the replica signal produced in the previous stage is subtracted from the received signal, and the bandlimiting and the equalization and decision making in the particular stage are performed using the residual signal.