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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Nov 4, 2003
Issued date -
Oct 20, 1995
filing date -
08/546,544
serial no -
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Abstract
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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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,128,957 Initial acquisition method in spread spectrum system and such system | 18 | 1991 | |
| 5,280,499 Spread spectrum communication system | 36 | 1992 | |
| 5,375,141 Synchronizing circuit in a spread spectrum communications system | 49 | 1993 | |
| 5,469,470 Spread spectrum communication system using two-predetermined-code pseudo-noise signals | 20 | 1994 | |
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| 5,497,505 Call set-up and spectrum sharing in radio communication on systems with dynamic channel allocation | 86 | 1993 | |
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| 5,481,561 Fully meshed CDMA network for personal communications terminals | 47 | 1993 | |
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| 5,257,257 Method of controlling the operation of a packet switched CDMA communication network for controlling the operation of transmitters and receivers | 94 | 1992 | |
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| 5,394,391 Method of controlling the operation of a packet switched CDMA telecommunication network | 51 | 1993 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 4, 2015 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |