Patent ID: 7031402
Filing Date: 2006-04-18
Classification: H04B

Abstract:
1. An interference signal removal system for removing from a received signal an interference signal that appears repeatedly with a passage of time, which system is characterized in that it estimates the interference signal contained in the received signal based on a past interference signal estimation result and removes the estimated interference signal from the received signal, said interference signal removing system comprising: an interference signal estimating means for estimating the interference signal contained in the received signal based on the received signal and a result obtained by removing the interference signal from the received signal; an interference signal removing means for removing from the received signal the interference signal estimated by said interference signal estimating means; and an interference signal estimation controlling means for storing the interference signal estimation result of the interference signal estimating means in memory and controlling the interference signal estimation by the interference signal estimating means so as to estimate the interference signal contained in the received signal based on the past interference signal estimation result stored in memory, wherein said interference signal estimating means estimates the interference signal contained in the received signal by sequentially updating a control coefficient for extracting the interference signal from the received signal based on the received signal and a result obtained by removing the interference signal from the received signal; wherein said interference signal removing means has an interference signal extracting means that extracts the interference signal from the received signal using the control coefficient sequentially updated by the interference signal estimating means, and removes the interference signal extracted by said interference signal extracting means from the received signal; and wherein said interference signal estimation controlling means stores the sequentially updated control coefficient result value as an interference signal estimation result of said interference signal estimating means and controls the interference signal estimation by said interference signal estimating means so as to sequentially update the control coefficient for extracting the interference signal from the received signal using a past sequentially updated control coefficient result value stored in memory as an initial value.