US5694414A
Expired / Lapsed
US
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Multi-band, multi-mode spread-spectrum communication system
Assignee: Intel Corp
•
Filing: 1995-06-07
•
Granted: 1997-12-02
•
Expires: 2015-06-07
Abstract
Abstract A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2.4-2.4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network. A multi-band transmitter comprises a single frequency synthesizer and a frequency source (e.g., a local oscillator), coupled to a selectable band pass filter. A multi-band receiver capable of monitoring one or more frequency bands comprises bank of bandpass filters and a demodulator comprising a single frequency synthesizer and a frequency source.
Inventors
- 👤 Douglas G. Smith
- 👤 Robert C. Dixon
- 👤 Jeffrey S. Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:14
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; G; G10; G10L; G10L19/00; G10L19/012; H04B1/005; H04B1/0053; H04B1/0057; H04B1/006; H04B1/38; H04B1/40; H04B1/403; H04B1/406; H04B1/707; H04B7/00; H04B7/24; H04B7/26; H04B7/2618; H04B7/2628; H04B7/2634; H04J; H04J13/00; H04L; H04L27/00; H04L27/10; H04L27/12; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/08; H04W52/30; H04W52/36; H04W52/362; H04W52/367; H04W52/38; H04W52/40; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70707; H04B2201/7071; H04L1/00; H04L1/0001; H04L1/0002; H04W36/00; H04W36/16; H04W36/18; H04W88/00; H04W88/02; H04W88/06
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
87 words
An apparatus for multi-band spread spectrum communication, comprising: a dual-band frequency source comprising: a frequency synthesizer outputting synthesized signals having a a first synthesized frequency range, a fixed frequency source outputting a signal comprising a second frequency, and a multiplier having as a first input the output of said frequency synthesizer and having as a second input the output of said fixed frequency source, said multiplier having a first output frequency range and a second frequency range; and a binary encoder coupled to said dual-band frequency source.
Claim 2
Independent Claim
87 words
An apparatus for multi-band spread spectrum communication, comprising: a dual-band frequency source comprising: a frequency synthesizer outputting synthesized signals having a a first synthesized frequency range, a fixed frequency source outputting a signal comprising a second frequency, and a multiplier having as a first input the output of said frequency synthesizer and having as a second input the output of said fixed frequency source, said multiplier having a first output frequency range and a second frequency range; and a binary encoder coupled to said dual-band frequency source.
Claim 3
Dependent Claim
47 words
The apparatus of claim 1 wherein said first output frequency range is defined by summation of said first synthesized frequency range and said second frequency; and said second output frequency range is defined by taking the difference between said first synthesized frequency range and said second frequency.
Claim 4
Dependent Claim
13 words
The apparatus of claim 2 wherein the second frequency is about 2200 megahertz.
Claim 5
Dependent Claim
18 words
The apparatus of claim 2 wherein the first synthesized frequency range is between about 300 and 440 megahertz.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein said binary encoder comprises a spread-spectrum encoder.
Claim 7
Dependent Claim
18 words
The apparatus of claim 1 wherein said first output frequency range spans from 2400 megahertz to 2483.5 megahertz.
Claim 8
Dependent Claim
18 words
The apparatus of claim 1 wherein said second output frequency range spans from 1850 megahertz to 1990 megahertz.
Claim 9
Dependent Claim
58 words
The apparatus of claim 1 wherein said frequency synthesizer comprises: a reference frequency signal source; a programmable divide-by-N counter; a multiplier having inputs coupled to said programmable divide-by-N counter and said reference frequency signal source; and a voltage-controlled oscillator having an input coupled to said multiplier, said voltage-controlled oscillator having an output coupled to said programmable divide-by-N counter.
Claim 10
Dependent Claim
25 words
The apparatus of claim 1 wherein a signal having a frequency in both of said first and second output frequency ranges are transmitted at once.
Claim 11
Dependent Claim
12 words
The apparatus of claim 1 further comprising a multi-band spread spectrum receiver.
Claim 12
Dependent Claim
26 words
The apparatus of claim 10 wherein said multi-band spread spectrum receiver monitors a frequency in both of said first and second output frequency ranges at once.
Claim 13
Independent Claim
174 words
An apparatus for multi-band spread-spectrum communication comprising: a spread spectrum signal generator, comprising: a spread spectrum encoder having as an input information to be encoded and having as an output a spread spectrum signal, said spread spectrum signal being modulated by a first signal having a first frequency, and said spread spectrum signal generator outputting a modulated spread spectrum signal comprising the first frequency; a frequency synthesizer outputting a synthesized signal comprising a second frequency; a multiplier having a first input coupled to said frequency synthesizer and a second input coupled to said spread spectrum signal generator, said multiplier generating a bimodal signal by multiplying said modulated spread spectrum signal and said synthesized signal; a filter coupled to said bimodal signal, said filter having at least a first output frequency range and a second output frequency range; said first output frequency range is defined by summation of said first frequency and said second frequency; and said second output frequency range is defined by taking the difference between said first frequency and said second frequency.
Claim 14
Independent Claim
174 words
An apparatus for multi-band spread-spectrum communication comprising: a spread spectrum signal generator, comprising: a spread spectrum encoder having as an input information to be encoded and having as an output a spread spectrum signal, said spread spectrum signal being modulated by a first signal having a first frequency, and said spread spectrum signal generator outputting a modulated spread spectrum signal comprising the first frequency; a frequency synthesizer outputting a synthesized signal comprising a second frequency; a multiplier having a first input coupled to said frequency synthesizer and a second input coupled to said spread spectrum signal generator, said multiplier generating a bimodal signal by multiplying said modulated spread spectrum signal and said synthesized signal; a filter coupled to said bimodal signal, said filter having at least a first output frequency range and a second output frequency range; said first output frequency range is defined by summation of said first frequency and said second frequency; and said second output frequency range is defined by taking the difference between said first frequency and said second frequency.
Claim 15
Dependent Claim
24 words
The apparatus of claim 12 wherein the information is encoded by the spread spectrum signal generator by modulating the information with a PN code.
Claim 16
Dependent Claim
22 words
The apparatus of claim 12 wherein the information is encoded by the spread spectrum signal generator using an M-ary spread spectrum technique.
Claim 17
Dependent Claim
54 words
The apparatus of claim 12 wherein said filter comprises: a first band pass filter comprising a center filtering frequency defined by summation of said first frequency and said second frequency; and a second band pass filter comprising a center filtering frequency defined by taking the difference between said first frequency and said second frequency.
Claim 18
Dependent Claim
19 words
The apparatus of claim 15 wherein said filter further comprises a wideband amplifier coupled to a band select signal.
Claim 19
Dependent Claim
74 words
The apparatus of claim 12 wherein said filter comprises: a first narrowband power amplifier which operates at a frequency defined by summation of said first frequency and said second frequency, said first narrowband power amplifier outputting a first amplified signal; and a second narrowband power amplifier which operates at a frequency defined by taking the difference between said first frequency and said second frequency, said second narrowband power amplifier outputting a second amplified signal.
Claim 20
Dependent Claim
47 words
The apparatus of claim 17 wherein said filter further comprises a multiplexer having an input coupled to said first amplified signal and an input coupled to said second amplified signal, said multiplexer outputting one of said first or second amplified signals in response to a control signal.
Claim 21
Dependent Claim
39 words
The apparatus of claim 17 wherein said filter further comprises at least one switch coupled to said first and second amplified signals, whereby one of said first or second amplified signals is selected in response to a control signal.
Claim 22
Dependent Claim
50 words
The apparatus of claim 12 wherein said spread spectrum signal generator further comprises: a fixed signal source which outputs the first signal, said first signal being a carrier signal; and a modulator having as inputs said output of said spread spectrum encoder and said output of said fixed signal source.
Claim 23
Dependent Claim
58 words
The apparatus of claim 12 wherein said frequency synthesizer comprises: a reference frequency signal source; a programmable divide-by-N counter; a multiplier having inputs coupled to said programmable divide-by-N counter and said reference frequency signal source; and a voltage-controlled oscillator having an input coupled to said multiplier, said voltage-controlled oscillator having an output coupled to said programmable divide-by-N counter.
Claim 24
Dependent Claim
18 words
The apparatus of claim 12 wherein said first output frequency range spans from 2400 megahertz to 2483.5 megahertz.
Claim 25
Dependent Claim
18 words
The apparatus of claim 12 wherein said second output frequency range spans from 1850 megahertz to 1990 megahertz.
Claim 26
Dependent Claim
25 words
The apparatus of claim 12 wherein a signal having a frequency in both of said first and second output frequency ranges are transmitted at once.
Claim 27
Dependent Claim
74 words
The apparatus of claim 12 wherein said first output frequency range comprises a plurality of first frequency sub-bands; said second output frequency range comprises a plurality of second frequency sub-bands; each one of said first frequency sub-bands is paired with a corresponding one of said second frequency sub-bands to define a plurality of frequency pairs; and said second frequency is selected from a discrete group of frequencies corresponding to said plurality of frequency pairs.
Claim 28
Dependent Claim
12 words
The apparatus of claim 12 further comprising a multi-band spread spectrum receiver.
Claim 29
Dependent Claim
17 words
The apparatus of claim 26 wherein the same frequency synthesizer is used for both transmitting and receiving.
Claim 30
Independent Claim
106 words
A method of multi-band spread spectrum communication, comprising the steps of: generating with a frequency synthesizer a first synthesized frequency range, said first synthesized frequency range being programmably selectable; generating a signal comprising a fixed second frequency; multiplying said first synthesized frequency range and said second frequency to generate multiplied signals having frequency components in each of two output frequency ranges, including a first output frequency range defined by summation of said first synthesized frequency range and said second frequency, and a second output frequency range defined by taking the difference between said first synthesized frequency range and said second frequency; and encoding said multiplied signal.
Claim 31
Independent Claim
106 words
A method of multi-band spread spectrum communication, comprising the steps of: generating with a frequency synthesizer a first synthesized frequency range, said first synthesized frequency range being programmably selectable; generating a signal comprising a fixed second frequency; multiplying said first synthesized frequency range and said second frequency to generate multiplied signals having frequency components in each of two output frequency ranges, including a first output frequency range defined by summation of said first synthesized frequency range and said second frequency, and a second output frequency range defined by taking the difference between said first synthesized frequency range and said second frequency; and encoding said multiplied signal.
Claim 32
Dependent Claim
12 words
The method of claim 28 wherein said encoding step comprises spread-spectrum encoding.
Claim 33
Dependent Claim
27 words
The method of claim 28 wherein multiplied signals having frequencies in both of said first output frequency range and second output frequency range are transmitted at once.
Claim 34
Dependent Claim
13 words
The method of claim 28 further comprising the step of receiving spread-spectrum signals.
Claim 35
Independent Claim
23 words
The method of 31 wherein said receiving step monitors a frequency in both of said first and second output frequency ranges at once.
Claim 36
Independent Claim
23 words
The method of 31 wherein said receiving step monitors a frequency in both of said first and second output frequency ranges at once.
Claim 37
Dependent Claim
13 words
The method of claim 28 wherein the second frequency is about 2200 megahertz.
Claim 38
Dependent Claim
17 words
The method of claim 28 wherein the first synthesized frequency range is between 300 and 440 megahertz.
Claim 39
Independent Claim
137 words
A method for multi-band spread-spectrum communication, comprising the steps of: generating a modulated spread spectrum signal by encoding information in a spread spectrum encoder to generate a spread spectrum signal and multiplying said spread spectrum signal with a signal having a first frequency, said modulated spread spectrum signal comprising the first frequency; generating with a frequency synthesizer a synthesized signal comprising a second frequency; multiplying said modulated spread spectrum signal and said synthesized signal to generate a bimodal signal; and filtering said bimodal signal to output a filtered signal having a first output frequency range and a second output frequency range, said first output frequency range is defined by summation of said first frequency and said second frequency, said second output frequency range is defined by taking the difference between said first frequency and said second frequency.
Claim 40
Independent Claim
137 words
A method for multi-band spread-spectrum communication, comprising the steps of: generating a modulated spread spectrum signal by encoding information in a spread spectrum encoder to generate a spread spectrum signal and multiplying said spread spectrum signal with a signal having a first frequency, said modulated spread spectrum signal comprising the first frequency; generating with a frequency synthesizer a synthesized signal comprising a second frequency; multiplying said modulated spread spectrum signal and said synthesized signal to generate a bimodal signal; and filtering said bimodal signal to output a filtered signal having a first output frequency range and a second output frequency range, said first output frequency range is defined by summation of said first frequency and said second frequency, said second output frequency range is defined by taking the difference between said first frequency and said second frequency.
Claim 41
Dependent Claim
20 words
The method of claim 35 further comprising the step of selecting one of said first or second output frequency ranges.
Claim 42
Dependent Claim
54 words
The method of claim 35 wherein said filtering step comprises the steps of: band pass filtering with a center filtering frequency defined by summation of said first frequency and said second frequency; and band pass filtering with a center filtering frequency defined by taking the difference between said first frequency and said second frequency.
Claim 43
Dependent Claim
63 words
The method of claim 35 wherein said filtering step comprises the steps of: amplifying said bimodal signal at a frequency defined by summation of said first frequency and said second frequency and outputting a first amplified signal; and amplifying said bimodal signal at a frequency defined taking the difference between said first frequency and said second frequency and outputting a second amplified signal.
Claim 44
Dependent Claim
38 words
The method of claim 38 wherein said step of filtering further comprises the steps of multiplexing said first and second amplified signals and outputting one of said first or second amplified signals in response to a control signal.
Claim 45
Dependent Claim
37 words
The method of claim 38 wherein said step of filtering further comprises the step of switching said first and second signals and outputting one of said first or second amplified signals in response to a control signal.
Claim 46
Dependent Claim
26 words
The method of claim 35 wherein signals having frequencies in both of said first output frequency range and second output frequency range are transmitted at once.
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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) | 2000-12-01 | 2001-06-02 | 2001-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-01 | 2005-06-02 | 2005-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-01 | 2009-06-02 | 2009-12-02 | $7700.00 | Window Closed / Lapsed |