US Patent No: 6,643,319

Number of patents in Portfolio can not be more than 2000

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

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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.TOKYO17952

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kokaji, Harumi Hino, JP 4 170
Nakagawa, Yoshikatsu Yamato, JP 9 319
Suzuki, Masamitsu Tokyo-to, JP 43 311
Takahashi, Satoshi Hitachinaka, JP 366 2388

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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BELL CANADA INTERNATIONAL INC. (1)
5,497,505 Call set-up and spectrum sharing in radio communication on systems with dynamic channel allocation 110 1993
 
COMSAT CORPORATION (1)
5,481,561 Fully meshed CDMA network for personal communications terminals 50 1993
 
Nokia Mobiltelefoner AB (1)
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NOKIA SIEMENS NETWORKS OY (1)
5,394,391 Method of controlling the operation of a packet switched CDMA telecommunication network 51 1993

Patent Citation Ranking

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8,321,307 Methods for processing and transferring shipping documentation data from a vehicle 1 2011
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8,244,605 Devices for processing shipping documentation sent from a vehicle 0 2011
8,362,888 Information transmission and processing systems and methods for freight carriers 0 2012
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8,339,251 Information transmission and processing systems and methods for freight carriers 1 2012
 
NEC CORPORATION (1)
7,142,526 Mobile communication terminal equipment, control method therefor, and recording medium on which control program therefor is recorded 5 2000
 
SAMSUNG ELECTRONICS CO., LTD. (1)
8,059,614 Pseudorandom noise selection method for mobile communication sites 0 2007
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (1)
8,526,482 Non-contiguous variable length orthogonal codes 1 2005

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11.5 Year Payment $7400.00 $3700.00 $1850.00 May 4, 2015
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