US6044073A
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US
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Methods of and devices for enhancing communications that use spread spectrum technology by using variable power techniques
Assignee: Agere Systems LLC
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Filing: 1998-08-06
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Granted: 2000-03-28
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Expires: 2018-08-06
Abstract
Abstract We have invented methods of and devices for introducing unequal error protection into spread spectrum communication systems. One embodiment of the invention addresses certain inefficiencies of the standard known as IS-95 used, for example, in some mobile direct sequence code division multiple access ("DS-CDMA") phone systems. The invention allows for increased system capacity and/or improved quality. More specifically, spread spectrum multiple access ("SSMA") coding may be combined with the concept of unequal error protection ("UEP"), resulting in an UEP SSMA coding process. IS-95, in order to make significant portions of a signal highly immune to errors, has imposed the same high degree of error immunity on less significant portions of the signal (when, in fact, a lower degree would suffice) and, thus, wastes bandwidth. The present invention's coding process (i.e., UEP SSMA) utilizes bandwidth in a closer to optimal manner than known methods.
Inventors
- 👤 Nambirajan Seshadri
- 👤 Carl-Erik Wilhelm Sundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:29
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H03; H03M; H03M13/00; H03M13/35; H04B; H04B1/00; H04B1/69; H04B1/707; H04L1/007; H04L1/0078; H04L1/0083; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H04L1/0045; H04L1/0054; H04L1/0059; H04L2001/0092; H04L2001/0096; H04L2001/0098
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
90 words
A method of processing a signal comprising applying a spread spectrum coding process, the signal being a function of time, the improvement comprising: modulating the signal to generate a modulated signal, the signal comprising a first segment a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the modulating step increasing a duration of the first time portion relative to a duration of the second time portion.
Claim 2
Independent Claim
90 words
A method of processing a signal comprising applying a spread spectrum coding process, the signal being a function of time, the improvement comprising: modulating the signal to generate a modulated signal, the signal comprising a first segment a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the modulating step increasing a duration of the first time portion relative to a duration of the second time portion.
Claim 3
Dependent Claim
28 words
The method of claim 1 further comprising spreading the modulated signal to generate a spread spectrum signal, the spreading comprising combining the modulated signal with a spreading signal.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said spreading step comprises the use of an orthogonal spreading sequence.
Claim 5
Dependent Claim
33 words
The method of claim 1 further comprising: (a) modulating a radio frequency carrier with a spread spectrum signal to generate a modulated radio frequency signal; and (b) transmitting the modulated radio frequency signal.
Claim 6
Dependent Claim
59 words
The method of claim 1 wherein the signal is generated by: (a) receiving an analog voice signal at a transmitter; (b) coding the analog voice signal to generate a digitized voice signal; (c) applying a forward error correction code to the digitized voice signal to generate an intermediate signal; and (d) interleaving the intermediate signal to generate the signal.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein said interleaving step comprises interleaving the intermediate signal based upon a basic time unit of the signal.
Claim 8
Dependent Claim
38 words
The method of claim 1 wherein both the first segment and the second segment are modulated and wherein a duration increase in the first time portion is the same as a duration decrease in the second time portion.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein said applying the spread spectrum coding process step comprises applying a code division multiple access coding process.
Claim 10
Dependent Claim
27 words
The method of claim 8 wherein said applying the code division multiple access coding process step comprises applying a direct sequence code division multiple access coding process.
Claim 11
Independent Claim
99 words
An apparatus for processing a signal including means for applying a spread spectrum coding process, the signal being a function of time, the improvement comprising: means for modulating the signal to generate a modulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the means for modulating comprising means for increasing a duration of the first time portion relative to a duration of the second time portion.
Claim 12
Independent Claim
99 words
An apparatus for processing a signal including means for applying a spread spectrum coding process, the signal being a function of time, the improvement comprising: means for modulating the signal to generate a modulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the means for modulating comprising means for increasing a duration of the first time portion relative to a duration of the second time portion.
Claim 13
Dependent Claim
32 words
The apparatus of claim 10 further comprising means for spreading the modulated signal to generate a spread spectrum signal, the means for spreading comprising combining the modulated signal with a spreading signal.
Claim 14
Dependent Claim
18 words
The apparatus of claim 11 wherein the means for spreading comprises means for using an orthogonal spreading sequence.
Claim 15
Dependent Claim
37 words
The apparatus of claim 10 further comprising: (a) means for modulating a radio frequency carrier with a spread spectrum signal to generate a modulated radio frequency signal; and (b) means for transmitting the modulated radio frequency signal.
Claim 16
Dependent Claim
67 words
The apparatus of claim 10 wherein the signal is generated by: (a) means for receiving an analog voice signal at a transmitter; (b) means for coding the analog voice signal to generate a digitized voice signal; (c) means for applying a forward error correction code to the digitized voice signal to generate an intermediate signal; and (d) means for interleaving the intermediate signal to generate the signal.
Claim 17
Dependent Claim
26 words
The apparatus of claim 14 wherein the means for interleaving comprises means for interleaving the intermediate signal based upon a basic time unit of the signal.
Claim 18
Dependent Claim
41 words
The apparatus of claim 10 wherein the means for modulating modulates both the first segment and the second segment and wherein a duration increase in the first time portion is the same as a duration decrease in the second time portion.
Claim 19
Dependent Claim
26 words
The apparatus of claim 10 wherein the means for applying the spread spectrum coding process comprises means for applying a code division multiple access coding process.
Claim 20
Dependent Claim
30 words
The apparatus of claim 17 wherein the means for applying the code division multiple access coding process comprises means for applying a direct sequence code division multiple access coding process.
Claim 21
Independent Claim
96 words
A method including applying a spread spectrum decoding method to a signal, the signal being a function of time, the improvement comprising: variable time demodulating the signal to generate a variable time demodulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the variable time demodulating comprising increasing a duration of the second time portion relative to a duration of the first time portion.
Claim 22
Independent Claim
96 words
A method including applying a spread spectrum decoding method to a signal, the signal being a function of time, the improvement comprising: variable time demodulating the signal to generate a variable time demodulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the variable time demodulating comprising increasing a duration of the second time portion relative to a duration of the first time portion.
Claim 23
Dependent Claim
45 words
The method of claim 19 wherein said variable time demodulating comprises: (a) despreading the signal to generate a despread signal; (b) deinterleaving the despread signal to generate a deinterleaved signal; and (c) demultiplexing the deinterleaved signal to generate a first signal and a second signal.
Claim 24
Dependent Claim
36 words
The method of claim 20 further comprising: (a) generating a first series of soft decision values based upon the first signal; and (b) generating a second series of soft decision values based upon the second signal.
Claim 25
Dependent Claim
23 words
The method of claim 20 wherein said deinterleaving step comprises deinterleaving an intermediate signal based upon a basic time unit of the signal.
Claim 26
Dependent Claim
41 words
The method of claim 19 wherein said variable time demodulating demodulates both the first segment and the second segment and wherein a duration increase in the second time portion is the same as a duration decrease in the first time portion.
Claim 27
Dependent Claim
23 words
The method of claim 19 wherein said applying the spread spectrum decoding process step comprises applying a code division multiple access decoding process.
Claim 28
Dependent Claim
27 words
The method of claim 24 wherein said applying the code division multiple access decoding process step comprises applying a direct sequence code division multiple access decoding process.
Claim 29
Independent Claim
104 words
An apparatus including means for applying a spread spectrum decoding method to a signal, the signal being a function of time, the improvement comprising: means for variable time demodulating the signal to generate a variable time demodulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the means for variable time demodulating comprising means for increasing a duration of the second time portion relative to a duration of the first time portion.
Claim 30
Independent Claim
104 words
An apparatus including means for applying a spread spectrum decoding method to a signal, the signal being a function of time, the improvement comprising: means for variable time demodulating the signal to generate a variable time demodulated signal, the signal comprising a first segment and a second segment, the first segment being more significant than the second segment and comprising a first time portion of the signal, the second segment comprising a second time portion of the signal, the means for variable time demodulating comprising means for increasing a duration of the second time portion relative to a duration of the first time portion.
Claim 31
Dependent Claim
53 words
The apparatus of claim 26 wherein the means for variable time demodulating comprises: (a) means for despreading the signal to generate a despread signal; (b) means for deinterleaving the despread signal to generate a deinterleaved signal; and (c) means for demultiplexing the deinterleaved signal to generate a first signal and a second signal.
Claim 32
Dependent Claim
40 words
The apparatus of claim 27 further comprising: (a) means for generating a first series of soft decision values based upon the first signal; and (b) means for generating a second series of soft decision values based upon the second signal.
Claim 33
Dependent Claim
26 words
The apparatus of claim 27 wherein the means for deinterleaving comprises means for deinterleaving an intermediate signal based upon a basic time unit of the signal.
Claim 34
Dependent Claim
43 words
The apparatus of claim 26 wherein the means for variable time demodulating demodulates both the first segment and the second segment and wherein a duration increase in the second time portion is the same as a duration decrease in the first time portion.
Claim 35
Dependent Claim
26 words
The apparatus of claim 26 wherein the means for applying the spread spectrum coding process comprises means for applying a code division multiple access coding process.
Claim 36
Dependent Claim
30 words
The apparatus of claim 31 wherein the means for applying the code division multiple access coding process comprises means for applying a direct sequence code division multiple access coding process.
Claim 37
Independent Claim
88 words
An apparatus for processing a signal, the apparatus including means for applying a spread spectrum encoding process to the signal, the improvement comprising: means for applying a first error protection process to at least one more significant portion of the signal, and a second error protection process to at least one less significant portion of the signal, wherein the first error protection process provides a greater amount of error protection than the second error protection process, the means for applying comprises means for applying a variable time modulator.
Claim 38
Independent Claim
88 words
An apparatus for processing a signal, the apparatus including means for applying a spread spectrum encoding process to the signal, the improvement comprising: means for applying a first error protection process to at least one more significant portion of the signal, and a second error protection process to at least one less significant portion of the signal, wherein the first error protection process provides a greater amount of error protection than the second error protection process, the means for applying comprises means for applying a variable time modulator.
Claim 39
Dependent Claim
26 words
The apparatus of claim 33 wherein the means for applying the spread spectra encoding process comprises means for applying a code division multiple access coding process.
Claim 40
Dependent Claim
30 words
The apparatus of claim 34 wherein the means for applying the code division multiple access coding process comprises means for applying a direct sequence code division multiple access coding process.
Claim 41
Dependent Claim
33 words
The apparatus of claim 33, wherein the means for applying further comprises at least one of: (a) means for applying a variable power modulator, and (b) means for applying a variable rate coder.
Claim 42
Independent Claim
89 words
A method of processing a signal that applies a spread spectrum encoding process to the signal, the improvement comprising: applying a first error protection process to at least one more significant portion of the signal, and a second error protection process to at least one less significant portion of the signal, wherein the first error protection process provides a greater amount of error protection than the second error protection process, the step of applying comprises applying a variable time modulator to the signal to generate an intermediate modulated signal.
Claim 43
Independent Claim
89 words
A method of processing a signal that applies a spread spectrum encoding process to the signal, the improvement comprising: applying a first error protection process to at least one more significant portion of the signal, and a second error protection process to at least one less significant portion of the signal, wherein the first error protection process provides a greater amount of error protection than the second error protection process, the step of applying comprises applying a variable time modulator to the signal to generate an intermediate modulated signal.
Claim 44
Dependent Claim
24 words
The method of claim 37 wherein the step of applying the spread spectrum encoding process comprises applying a code division multiple access coding process.
Claim 45
Dependent Claim
28 words
The method of claim 38 wherein the step of applying the code division multiple access coding process comprises applying a direct sequence code division multiple access coding process.
Claim 46
Dependent Claim
43 words
The method of claim 37, wherein the step of applying further comprises at least one of: (a) applying a variable rate coder to the signal to generate an intermediate modulated signal; and (b) applying a variable power modulator to the intermediate modulated signal.
References Cited (Backward Citations)
US4217467A
Cited
US5282019A
Cited
US5003619A
Cited
US5140417A
Cited
US5022047A
Cited
US5031192A
Cited
US5197061A
Cited
US5416797A
Cited
US5105442A
Cited
US5280472A
Cited
EP0490552A2
Cited
US5214656A
Cited
WO1992017011A1
Cited
US5235614A
Cited
US5204876A
Cited
US5257029A
Cited
US5345596A
Cited
US5285470A
Cited
US5341401A
Cited
US5305352A
Cited
US5259003A
Cited
US5280537A
Cited
US5377194A
Cited
WO1993014588A1
Cited
US5452288A
Cited
US5295152A
Cited
US5287374A
Cited
US5416801A
Cited
US5390165A
Cited
US5502744A
Cited
US5311543A
Cited
US5274667A
Cited
US5396516A
Cited
US5341396A
Cited
US5329547A
Cited
EP0634840A1
Cited
US5412686A
Cited
US5383219A
Cited
US5691995A
Cited
US5751739A
Cited
US5533004A
Cited
US5691992A
Cited
US5825807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |