【発明の名称】入力信号濾波用選択フィルタ

Title:

【発明の名称】入力信号濾波用選択フィルタ

Document Type and Number:

Japanese Patent JP3486849

Kind Code:

B2

Abstract:

Complex signal samples of an input signal are supplied to via a frequency down-shifter to a digital filter, and to a time-frequency transform unit which produces a plurality of frequency components each associated with a respective frequency band within a bandwidth of the input signal. The frequency component having the maximum momentary energy is determined to determine the down-shifting frequency for the associated frequency band to be filtered, and to determine a complementary up-shifting following the digital filter to produce an output signal. The filter can be a bandpass filter or a bandstop filter, especially for reducing co-channel interference in different types of wireless communications systems.

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Inventors:

Tong Wen
Wang Louis

Application Number:

JP52407398A

Publication Date:

January 13, 2004

Filing Date:

February 26, 1997

Export Citation:

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Assignee:

NORTEL NETWORKS LIMITED

International Classes:

H04B7/005; H04B1/10; H04B7/12; H04B15/00; (IPC1-7): H04B1/10; H04B7/005; H04B15/00

Domestic Patent References:

JP8107367A
JP1320827A
JP63142726A
JP6258930U

Attorney, Agent or Firm:

Kazuto Izumi

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