Title:
RADIO COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP3259025
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To satify a sampling theorem while avoiding aliasing and to reproduce an interference signal or noise to each band pass filter with fidelity as well by suppressing the interference signal or noise wider than a band width B within the band width B through a 1st filter.
SOLUTION: After N pieces of 1st unit antennas 10, 1st filters 11 are connected to the respective antennas and limited into band width B. A filter 14 wider than band width N×B is provided for facilitating signal processing at a separating means 15 since the band is widened by a switching means 13. Through a filter 16 of the separating means 15, a signal is separated by a serial/parallel converter 17. In this case, when every band width of the filters 14 and 16 is infinite, there is no inter-channel interference. A received signal output 18 is interpolated by linear interpolation or secondary function interpolation as needed. Since conditions are required for the switching speed of the switching means 13 and the filters 14 and 16 for preventing the inter-channel interference, a filter satisfying the condition of Nyquist is used as the filter 16 so that the inter-channel interference is prevented.
Inventors:
Eisho Moriyama
Application Number:
JP23888897A
Publication Date:
February 18, 2002
Filing Date:
August 20, 1997
Export Citation:
Assignee:
National Institute of Communications Research
International Classes:
H04B1/44; H04B1/04; H04B1/18; (IPC1-7): H04B1/18; H04B1/04
Domestic Patent References:
| JP851381A |
Attorney, Agent or Firm:
Kenzo Fukuda (2 outside)