Apparatus and method for cancelling interference signals transmitted from neighbor base stations
AssigneeElectronics and Telecommunications Research Institute
InventorsIl-Soon Jang, Deuk Su Lyu, Hyun Seo Oh, Hyoung-Goo Jeon
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Abstract
An apparatus and method for canceling pilot signals from neighbor base stations is disclosed. The present invention cancels unnecessary pilot signals transmitted from the neighbor base stations by detecting, analyzing a PN signal in a pilot signal of each base station, generating estimated interference signal according to analyzed information from the detected PN signal and subtracting estimated interference signal from the received signal. Therefore, the present invention increases a bandwidth of downlink transmission channel and improves the demodulator to be operatable in low signal-to-noise ratio (Eb/No).
Claims8
An apparatus for canceling pilot signals from neighbor base stations to a mobile station, said apparatus comprising:
- search means for finding signals transmitted from neighbor base stations;
- estimation means for generating an estimated interference signal by estimating channels to detect characteristics of wireless channels of the neighbor base stations;
- cancellation means for canceling an interference signal in the received signal based on the estimated interference signal outputted from said estimation means and signals received from the neighbor base stations;
- and
- delay means for delaying input of the received signal to said cancellation means as much as time necessary for generating the estimated interference signal in said estimation means.
A method for canceling pilot signals of neighbor base stations, comprising the steps of:
- a) searching signals transmitted from the neighbor base stations to a mobile station by analyzing a received signals;
- b) generating an estimated interference signal by estimating channels of the base stations to detect characteristics of wireless channels of the neighbor base stations and generating the estimated interference signal;
- and
- c) canceling an interference signal calculated by using the estimated interference signal and the signals received from the neighbor base stations.
A computer readable record medium storing instructions for implementing method for canceling pilot signals transmitted from neighbor base stations, the method comprising steps of:
- a) searching signals transmitted from the neighbor base stations to a mobile station by analyzing a received signals;
- b) generating an estimated interference signal by estimating channels of the base stations to detect characteristics of wireless channels of the neighbor base stations and generating the estimated interference signal;
- and
- c) canceling an interference signal calculated by using the estimated interference signal and the signals received from the neighbor base stations.
Dependencies are inferred from the claim text.