US5909435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband code-division multiple access system and method
Assignee: TransSKY Corp
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Filing: 1998-02-12
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Granted: 1999-06-01
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Expires: 2018-02-12
Abstract
Abstract A wideband code division multiple access, spread-spectrum communications system, having an equalization channel. The transmitter transmits data over a spread-spectrum channel, along with a spread-spectrum channel having little or no information, i.e., an equalization channel. The receiver uses in-phase early, punctual and late signals, and quadrature-phase early, punctual and late signals, for equalizing of the data spread-spectrum channel, and for generating an output in-phase data signal and an output quadrature-phase data signal.
Inventors
- 👤 Tuvia Apelewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04L; H04L27/00; H04L27/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
327 words
An improvement to a wideband code-division-multiple-access (W-CDMA) system, comprising: a W-CDMA transmitter, said W-CDMA transmitter including, an in-phase-data-product device for multiplying an in-phase-data (IDATA) signal with a data-chip-sequence signal, thereby generating an IDATA-spread-spectrum signal; a quadrature-phase-data-product device for multiplying a quadrature-phase-data (QDATA) signal with the data-chip-sequence signal, thereby generating a QDATA-spread-spectrum signal; equalization-chip means for outputting an equalization-chip-sequence signal; an in-phase combiner, coupled to said in-phase-data-product device and to said equalization-chip means, for linearly combining the IDATA-spread-spectrum signal and the equalization-chip-sequence signal, to generate an in-phase-combined-spread-spectrum signal; a quadrature-phase combiner, coupled to said quadrature-phase-data-product device and to said equalization-chip means, for linearly combining the QDATA-spread-spectrum signal, and the equalization-chip-sequence signal, to generate the quadrature-phase-combined-spread-spectrum signal; a quadrature-phase-shift-keyed (QPSK) modulator, coupled to said in-phase combiner and to said quadrature-phase combiner, for QPSK modulating the in-phase-combined-spread-spectrum signal with the quadrature-phase-combined-spread-spectrum signal, thereby generating a QPSK-spread-spectrum signal; a power amplifier, coupled to said QPSK modulator, for amplifying the QPSK-spread-spectrum signal; a transmitter antenna, coupled to said power amplifier, for radiating the amplified QPSK-spread-spectrum signal over a communications channel; a W-CDMA receiver, said W-CDMA receiver including, a receiver antenna for coupling the W-CDMA receiver to the communications channel; in-phase-equalization means for despreading, at a first chip time and at a second chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-equalization means for despreading, at the first chip time and at the second chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; in-phase-data means for despreading, at the first chip time and at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-data means for despreading, at the first chip time and at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and a processor, coupled to said in-phase-equalization means, said quadrature-phase-equalization means, said in-phase-data means, and said quadrature-phase-data means, for determining, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 2
Dependent Claim
327 words
An improvement to a wideband code-division-multiple-access (W-CDMA) system, comprising: a W-CDMA transmitter, said W-CDMA transmitter including, an in-phase-data-product device for multiplying an in-phase-data (IDATA) signal with a data-chip-sequence signal, thereby generating an IDATA-spread-spectrum signal; a quadrature-phase-data-product device for multiplying a quadrature-phase-data (QDATA) signal with the data-chip-sequence signal, thereby generating a QDATA-spread-spectrum signal; equalization-chip means for outputting an equalization-chip-sequence signal; an in-phase combiner, coupled to said in-phase-data-product device and to said equalization-chip means, for linearly combining the IDATA-spread-spectrum signal and the equalization-chip-sequence signal, to generate an in-phase-combined-spread-spectrum signal; a quadrature-phase combiner, coupled to said quadrature-phase-data-product device and to said equalization-chip means, for linearly combining the QDATA-spread-spectrum signal, and the equalization-chip-sequence signal, to generate the quadrature-phase-combined-spread-spectrum signal; a quadrature-phase-shift-keyed (QPSK) modulator, coupled to said in-phase combiner and to said quadrature-phase combiner, for QPSK modulating the in-phase-combined-spread-spectrum signal with the quadrature-phase-combined-spread-spectrum signal, thereby generating a QPSK-spread-spectrum signal; a power amplifier, coupled to said QPSK modulator, for amplifying the QPSK-spread-spectrum signal; a transmitter antenna, coupled to said power amplifier, for radiating the amplified QPSK-spread-spectrum signal over a communications channel; a W-CDMA receiver, said W-CDMA receiver including, a receiver antenna for coupling the W-CDMA receiver to the communications channel; in-phase-equalization means for despreading, at a first chip time and at a second chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-equalization means for despreading, at the first chip time and at the second chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; in-phase-data means for despreading, at the first chip time and at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-data means for despreading, at the first chip time and at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and a processor, coupled to said in-phase-equalization means, said quadrature-phase-equalization means, said in-phase-data means, and said quadrature-phase-data means, for determining, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 3
Independent Claim
281 words
A method using a wideband code-division-multiple-access (W-CDMA) transmitter and a W-CDMA receiver, comprising the steps of: multiplying, at said W-CDMA transmitter, an in-phase-data (IDATA) signal with a data-chip-sequence signal, thereby generating an IDATA-spread-spectrum signal; multiplying, at said W-CDMA transmitter, a quadrature-phase-data (QDATA) signal with the data-chip-sequence signal, thereby generating a QDATA-spread-spectrum signal; generating, at said W-CDMA transmitter, an equalization-chip-sequence signal; combining, linearly, at said W-CDMA transmitter, the IDATA-spread-spectrum signal and the equalization-chip-sequence signal, to generate an in-phase-combined-spread-spectrum signal; combining, linearly, at said W-CDMA transmitter, the QDATA-spread-spectrum signal, and the equalization-chip-sequence signal, to generate the quadrature-phase-combined-spread-spectrum signal; QPSK modulating, at said W-CDMA transmitter, the in-phase-combined-spread-spectrum signal with the quadrature-phase-combined-spread-spectrum signal, thereby generating a QPSK-spread-spectrum signal; radiating, at said W-CDMA transmitter, the QPSK-spread-spectrum signal over a communications channel; despreading, at a first chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading at a second chip time, the second chip time different from the first chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 4
Independent Claim
281 words
A method using a wideband code-division-multiple-access (W-CDMA) transmitter and a W-CDMA receiver, comprising the steps of: multiplying, at said W-CDMA transmitter, an in-phase-data (IDATA) signal with a data-chip-sequence signal, thereby generating an IDATA-spread-spectrum signal; multiplying, at said W-CDMA transmitter, a quadrature-phase-data (QDATA) signal with the data-chip-sequence signal, thereby generating a QDATA-spread-spectrum signal; generating, at said W-CDMA transmitter, an equalization-chip-sequence signal; combining, linearly, at said W-CDMA transmitter, the IDATA-spread-spectrum signal and the equalization-chip-sequence signal, to generate an in-phase-combined-spread-spectrum signal; combining, linearly, at said W-CDMA transmitter, the QDATA-spread-spectrum signal, and the equalization-chip-sequence signal, to generate the quadrature-phase-combined-spread-spectrum signal; QPSK modulating, at said W-CDMA transmitter, the in-phase-combined-spread-spectrum signal with the quadrature-phase-combined-spread-spectrum signal, thereby generating a QPSK-spread-spectrum signal; radiating, at said W-CDMA transmitter, the QPSK-spread-spectrum signal over a communications channel; despreading, at a first chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading at a second chip time, the second chip time different from the first chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 5
Dependent Claim
109 words
The W-CDMA method as set forth in claim 2, further comprising the steps of: despreading, at a third chip time, the third chip time different from the first chip time and from the second chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, the output-in-phase-data signal and the output-quadrature-phase-data signal.
Claim 6
Dependent Claim
196 words
An improvement to a wideband code-division-multiple-access (W-CDMA) receiver for receiving a QPSK-spread-spectrum signal comprising an in-phase-combined-spread-spectrum signal and a quadrature-phase-combined-spread-spectrum signal, with the in-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with an in-phase-data signal spread-spectrum processed with a data-chip-sequence signal, and with the quadrature-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with a quadrature-phase-data signal spread-spectrum processed with the data-chip-sequence signal, the improvement comprising: in-phase-equalization means for despreading, at a first chip time and at a second chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-equalization means for despreading, at the first chip time and at the second chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; in-phase-data means for despreading, at the first chip time and at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-data means for despreading, at the first chip time and at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and a processor, coupled to said in-phase-equalization means, said quadrature-phase-equalization means, said in-phase-data means, and said quadrature-phase-data means, for determining, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 7
Dependent Claim
196 words
An improvement to a wideband code-division-multiple-access (W-CDMA) receiver for receiving a QPSK-spread-spectrum signal comprising an in-phase-combined-spread-spectrum signal and a quadrature-phase-combined-spread-spectrum signal, with the in-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with an in-phase-data signal spread-spectrum processed with a data-chip-sequence signal, and with the quadrature-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with a quadrature-phase-data signal spread-spectrum processed with the data-chip-sequence signal, the improvement comprising: in-phase-equalization means for despreading, at a first chip time and at a second chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-equalization means for despreading, at the first chip time and at the second chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; in-phase-data means for despreading, at the first chip time and at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; quadrature-phase-data means for despreading, at the first chip time and at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and a processor, coupled to said in-phase-equalization means, said quadrature-phase-equalization means, said in-phase-data means, and said quadrature-phase-data means, for determining, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 8
Dependent Claim
150 words
The improvement to the W-CDMA receiver as set forth in claim 4, wherein said in-phase-equalization means for despreading the in-phase component of the equalization-chip-sequence signal at the first chip time, at the second chip time, and at a third chip time, the first chip time different from the second chip time and from the third chip time, and the second chip time different from the third chip time; said quadrature-phase-equalization means for despreading the quadrature-phase component of the equalization-chip-sequence signal at the first chip time and at the second chip time and at the third chip time; said in-phase-data means for despreading the IDATA spread-spectrum signal at the first chip time and at the second chip time and at the third chip time; and said quadrature-phase-data means for despreading the QDATA spread-spectrum signal at the first chip time and at the second chip time and at the third chip time.
Claim 9
Independent Claim
220 words
A method for improving a wideband code-division-multiple-access (W-CDMA) receiver for receiving a QPSK-spread-spectrum signal comprising an in-phase-combined-spread-spectrum signal and a quadrature-phase-combined-spread-spectrum signal, with the in-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with an in-phase-data signal spread-spectrum processed with a data-chip-sequence signal, and with the quadrature-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with a quadrature-phase-data signal spread-spectrum processed with the data-chip-sequence signal, comprising the steps of: despreading, at a first chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at a second chip time, the second chip time different from the first chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 10
Independent Claim
220 words
A method for improving a wideband code-division-multiple-access (W-CDMA) receiver for receiving a QPSK-spread-spectrum signal comprising an in-phase-combined-spread-spectrum signal and a quadrature-phase-combined-spread-spectrum signal, with the in-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with an in-phase-data signal spread-spectrum processed with a data-chip-sequence signal, and with the quadrature-phase-combined-spread-spectrum signal including an equalization-chip-sequence signal combined with a quadrature-phase-data signal spread-spectrum processed with the data-chip-sequence signal, comprising the steps of: despreading, at a first chip time, an in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at a second chip time, the second chip time different from the first chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, a quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the first chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the second chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, an output-in-phase-data signal and an output-quadrature-phase-data signal.
Claim 11
Dependent Claim
109 words
The W-CDMA method as set forth in claim 6, further comprising the steps of: despreading, at a third chip time, the third chip time different from the first chip time and from the second chip time, the in-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the quadrature-phase component of the equalization-chip-sequence signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the IDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; despreading, at the third chip time, the QDATA spread-spectrum signal embedded in the QPSK-spread-spectrum signal; and generating, from the despread signals, the output-in-phase-data signal and the output-quadrature-phase-data signal.
Claim 12
Dependent Claim
23 words
The W-CDMA method as set forth in claim 2 or 6, wherein the second chip time is later than the first chip time.
Claim 13
Dependent Claim
23 words
The W-CDMA method as set forth in claim 2 or 6, wherein the second chip time is earlier than the first chip time.
Claim 14
Dependent Claim
35 words
The W-CDMA method as set forth in claim 3 or 7, wherein the second chip time is later than the first chip time and the third chip time is earlier than the first chip time.
References Cited (Backward Citations)
US4561089A
Cited
US4567588A
Cited
US5063560A
Cited
US4979183A
Cited
US5029180A
Cited
US5103459A
Cited
US5103459B1
Cited
US5121407A
Cited
US5495499A
Cited
US5420896A
Cited
US5218619A
Cited
US5177766A
Cited
US5410568A
Cited
US5383220A
Cited
US5375140A
Cited
US5329547A
Cited
US5297162A
Cited
US5359624A
Cited
US5544155A
Cited
US5442662A
Cited
US5345472A
Cited
US5550810A
Cited
US5414699A
Cited
US5377226A
Cited
US5414728A
Cited
US5581575A
Cited
US5515396A
Cited
US5559828A
Cited
US5666352A
Cited
US5488631A
Cited
US5477195A
Cited
US5602833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |