Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1995-06-05
1999-10-26
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375206, 375349, 455307, H04B 110
Patent
active
059741015
ABSTRACT:
A wireless communication apparatus employing spread spectrum modulation which detects and eliminates interference waves and temporarily stops and restarts communication for maintaining fine communication status. If the interference wave frequency band is known, a reception signal of the frequency band is eliminated. Communication is temporarily halted and restarted corresponding to interference occurrence period and/or radiowave propagation condition, and communication status is notified to a user. Further, if the interference wave occurrence period is unknown, the frequency of the interference wave is detected and a signal of the detected frequency is eliminated. In a case where communication is performed in packet form, the number of packets which can be transmitted sequentially without receiving reception confirmation is controlled based on the radiowave propagation condition. Moreover, a reception signal can be divided into a plurality of frequency band signals and interference wave detection can be performed in band signal units.
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Canon Kabushiki Kaisha
Chin Stephen
Gluck Jeffrey
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