Wireless computer network communication system and method which determines an available spreading code

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6643319
SERIAL NO

08546544

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A wireless network communication system and method in which the wireless channel can be determined by selecting a vacant pseudonoise (PN) or spreading code. When communication is started, in order to judge whether a PN code is being employed by another communication group, the degree of correlation between the received signal converted to an intermediate frequency or a base-band frequency by a transceiver and a reference pseudonoise code signal is detected using a correlation circuit within a correlation detector. There is a channel controller which controls the PN code used by the communication terminal which receives an output of the correlation detector which correlates a received channel signal with a reference PN code generated by the PN code generator. If the correlation output signal is not smaller than a threshold value, it is determined that the PN code is to be employed. Furthermore, at the time of transmission, the pseudonoise code generator is controlled so as to supply the selected PN code to a transceiver. The transceiver combines the data to be transmitted with the PN code to be used in order to determine the final signal which is to be transmitted by the terminal.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
RICOH COMPANY, LTD.TOKYO16980

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kokaji, Harumi Hino, JP 4 173
Nakagawa, Yoshikatsu Yamato, JP 10 346
Suzuki, Masamitsu Yokohama, JP 29 333
Takahashi, Satoshi Yokohama, JP 288 3050

Cited Art Landscape

Patent Info (Count) # Cites Year
 
NOKIA SIEMENS NETWORKS OY (1)
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Bell Canada International Inc. (1)
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Nokia Mobiltelefoner AB (1)
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COMSAT CORPORATION (1)
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RICOH COMPANY, LTD. (4)
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* 5375141 Synchronizing circuit in a spread spectrum communications system 49 1993
* 5469470 Spread spectrum communication system using two-predetermined-code pseudo-noise signals 21 1994
* Cited By Examiner

Patent Citation Ranking

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* Cited By Examiner