Spread spectrum communication apparatus and method
AssigneeCanon Kabushiki Kaisha
InventorsKatsuo Saito, Atsushi Takasaki
Life of this patent
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Abstract
There is provided a spread spectrum communication apparatus comprising a reception means for receiving a wide-band spread spectrum signal, a wave detection means for performing wave detection on a predetermined narrow-band signal within the reception signal received by the reception means, and a de-spread means for de-spreading the wide-band spread spectrum signal received by the reception means. Therefore, a desired one of a plurality of antennas to be used in a spread spectrum communication can be quickly and accurately selected, and also transmission power of the spread spectrum signal can be quickly and accurately controlled to have a desired value, whereby reliability of the spread spectrum communication can be increased.
Claims25
A spread spectrum communication apparatus comprising:
- a plurality of reception means for receiving a wide-band signal;
- de-spread means for de-spreading the wide-band signal;
- detection means for detecting a narrow-band signal within the wide-band signal which is not de-spread by said de-spread means;
- and
- selection means for selecting a second one of said plurality of reception means in a case where the narrow-band signal received by a first one of said plurality of reception means and detected by said detection means is lower than a predetermined level.
A spread spectrum communication method comprising the steps of:
- receiving a wide-band signal via a plurality of antennas;
- de-spreading the wide-band signal;
- detecting a narrow-band signal within the wide-band signal which is not de-spread in said de-spreading step;
- and
- selecting a second one of the plurality of antennas in a case where the narrow-band signal received via a first one of the plurality of antennas and detected in said detecting step is lower than a predetermined level.
A spread spectrum communication apparatus comprising:
- reception means for receiving a wide-band signal;
- de-spread means for de-spreading the wide-band signal;
- detecting means for detecting a plurality of narrow-band signals within the wide-band signal which is not de-spread by said de-spreading means;
- and
- control means for controlling spread spectrum communication using the wide-band signal in accordance with each of the plurality of narrow-band signals detected by said detecting means.
A spread spectrum communication method comprising the steps of:
- receiving a wide-band signal;
- de-spreading the wide-band signal;
- detecting a plurality of narrow-band signals within the wide-band signal which is not de-spread in said de-spreading step;
- and
- controlling spread spectrum communication using the wide-band signal in accordance with each of the plurality of narrow-band signals detected in said detecting step.
Dependencies are inferred from the claim text.