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US5926465A
Expired / Lapsed
US
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Spread-spectrum changeable base station
Assignee: InterDigital Technology Corp
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Filing: 1997-03-10
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Granted: 1999-07-20
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Expires: 2017-03-10
Abstract
Abstract A conference calling spread-spectrum communications system and method using a plurality of spread-spectrum units, any one of which may serve as the base station and where the base station may be changed from one spread-spectrum unit to another upon command. Each spread-spectrum unit includes a base subunit, a remote subunit, and a command subunit. An operator may initiate from the command subunit of a particular spread-spectrum unit, a command signal to activate the base subunit of the particular spread-spectrum unit. Upon initiating the command signal, the particular spread-spectrum unit is activated as the base station and the command signal is broadcast to the remaining plurality of spread-spectrum units. At a respective remote subunit of each of the remaining plurality of spread-spectrum units, the command signal is received and, in response to receiving the command signal, the respective remote subunit in each of the remaining plurality of spread-spectrum units is activated to operate the remaining plurality of spread-spectrums units as remote units.
Inventors
- 👤 Donald L. Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:04
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/561; H04W; H04W88/00; H04W88/02; H04W88/06; H04B; H04B1/00; H04B1/69; H04B1/707; H04W84/00; H04W84/02; H04W84/10; H04W88/08; H04B1/709; H04B1/7093; H04M2207/00; H04M2207/18; H04W72/00; H04W72/30; H04W84/18; H04W84/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
A spread-spectrum unit having base station on demand capability for use in a spread-spectrum system having a plurality of spread-spectrum units comprising: a base subunit including, means for receiving at a first frequency a plurality of spread-spectrum signals transmitted from a plurality of other spread-spectrum units, respectively; means for despreading received spread-spectrum signals as a plurality of despread-spread-spectrum signals, respectively; means for demodulating the plurality of despread-spread-spectrum signals, to generate a plurality of demodulated signals, respectively; means for combining the plurality of demodulated signals, and a local signal, as a combined signal; means for converting the combined signal to a base-data signal; means for spread-spectrum processing the base-data signal; means for transmitting at a second frequency the spread-spectrum-processed-base-data signal as a base-spread-spectrum signal; and a remote subunit including, means for receiving at the second frequency a base-spread-spectrum signal; means for despreading the received base-spread-spectrum signal as a despread-base-spread-spectrum signal; means for demodulating the despread-base-spread-spectrum signal as a demodulated signal; means for converting a local signal to a remote-data signal; means for spread-spectrum processing the remote-data signal; and means for transmitting at the first frequency the spread-spectrum-processed-remote-data signal as one of the plurality of spread-spectrum signals.
Claim 2
Dependent Claim
195 words
A spread-spectrum unit having base station on demand capability for use in a spread-spectrum system having a plurality of spread-spectrum units comprising: a base subunit including, means for receiving at a first frequency a plurality of spread-spectrum signals transmitted from a plurality of other spread-spectrum units, respectively; means for despreading received spread-spectrum signals as a plurality of despread-spread-spectrum signals, respectively; means for demodulating the plurality of despread-spread-spectrum signals, to generate a plurality of demodulated signals, respectively; means for combining the plurality of demodulated signals, and a local signal, as a combined signal; means for converting the combined signal to a base-data signal; means for spread-spectrum processing the base-data signal; means for transmitting at a second frequency the spread-spectrum-processed-base-data signal as a base-spread-spectrum signal; and a remote subunit including, means for receiving at the second frequency a base-spread-spectrum signal; means for despreading the received base-spread-spectrum signal as a despread-base-spread-spectrum signal; means for demodulating the despread-base-spread-spectrum signal as a demodulated signal; means for converting a local signal to a remote-data signal; means for spread-spectrum processing the remote-data signal; and means for transmitting at the first frequency the spread-spectrum-processed-remote-data signal as one of the plurality of spread-spectrum signals.
Claim 3
Dependent Claim
41 words
The spread-spectrum unit as set forth in claim 1, wherein said despreading means within said base subunit includes: a plurality of product devices coupled to said generating means for despreading the plurality of spread-spectrum signals as the plurality of despread-spread-spectrum signals.
Claim 4
Dependent Claim
63 words
The spread-spectrum unit as set forth in claim 1, wherein said despreading means within said base subunit includes a plurality of matched filters, with each of said plurality of matched filters having an impulse response matched to a plurality of chipping sequences, with the plurality of spread-spectrum signals having a plurality of data signals spread-spectrum processed with the plurality of chipping sequences, respectively.
Claim 5
Dependent Claim
22 words
The spread-spectrum unit as set forth in claim 1, wherein said spread-spectrum processing means within the base subunit includes a product device.
Claim 6
Dependent Claim
29 words
The spread-spectrum unit as set forth in claim 1, wherein said despreading means within the remote subunit includes a mixer for despreading the base-spread-spectrum signal as the despread-base-spread-spectrum signal.
Claim 7
Dependent Claim
30 words
The spread-spectrum unit as set forth in claim 1, wherein said despreading means within the remote subunit includes a matched filter for despreading the base-spread-spectrum signal as the despread-base-spread-spectrum signal.
Claim 8
Dependent Claim
23 words
The spread-spectrum unit as set forth in claim 1 further comprising: switch means for activating either said base subunit or said remote subunit.
Claim 9
Dependent Claim
28 words
A spread-spectrum unit as set forth in claim 7 including means for receiving a command signal operatively associated with said switching means to activate said remote unit subunit.
Claim 10
Dependent Claim
23 words
A spread-spectrum unit as set forth in claim 7 further comprising: means for manually operating said switching means to activate said base subunit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-19 | 2003-01-18 | 2003-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-19 | 2007-01-18 | 2007-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-19 | 2011-01-18 | 2011-07-20 | $7700.00 | Window Closed / Lapsed |