← Back to Patent Explorer
US6928101B2 Expired / Lapsed US ⏱️ 0.0 years remaining

FMOD transceivers including continuous and burst operated TDMA, FDMA, spread spectrum CDMA, WCDMA and CSMA

Assignee: Intel Corp
•
Filing: 2002-06-26
•
Granted: 2005-08-09
•
Expires: 2022-06-26
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Binary and Quadrature Feher's Modulation (F-Modulation, or FMOD) Transmitter-Receiver systems and circuits exhibit reduced envelope fluctuation and peak radiation, and increased efficiency. A subclass of these systems has a constant envelope. They advantageously provide lower power operation with improved performance including robust BER performance, and compatibility with both linearly and nonlinearly amplified narrow spectrum, and without disadvantages of conventional BPSK, DBPSK QPSK and pi/4-QPSK. Feher's BPSK (FBPSK) is an improved efficiency transmitter which is compatible with conventional BPSK receivers. FBPSK modems are based on using quadrature structure where Q-channel data is inserted in quadrature with I-channel data for certain applications. The Q-channel data may be “offset” from the I-channel data by an amount selectable between zero and a specified time. Further improvement in the spectrum is attained using correlation between I and Q channels. FBPSK modem is shown to meet the IEEE 802.11 specified spectral direct sequence spread spectrum mask (−30 dB point) for wireless LAN, and leads to an output power gain of 6.5 dB over conventional BPSK modems. The cross-coupled quadrature FMOD structure is also suitable for continuous mode and for burst operated TDMA, FDMA, CDMA, WCDMA and CSMA Frequency Modulation Quadrature AM (QAM), QPSK and offset QPSK, as well as pi/4-shifted QPSK modems/processors. Reduced modulation index Gaussian FSK (GFSK), multilevel FM and cross-coupled Quadrature Amplitude Modulated (QAM) transmitters and combinations of these modulations and corresponding coherent demodulators are disclosed. Controlled rise and fall time descriptions of burst operated systems are included.

Inventors

  • 👤 Kamilo Feher

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 19:46
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/362; H04L27/18; H04L27/20; H04L27/2032; H04L27/38; H03; H03C; H03C3/00; H03C3/005

Claims Analysis

Total Claims: 21
Claim 1
Independent Claim 37 words
An apparatus, comprising: a cross-correlator to receive in-phase and a quadrature signals to provide cross-correlated in-phase and quadrature signals; and a spreader to spread the in-phase signal prior to the in-phase signal being received by said cross-correlator.
Claim 2
Independent Claim 37 words
An apparatus, comprising: a cross-correlator to receive in-phase and a quadrature signals to provide cross-correlated in-phase and quadrature signals; and a spreader to spread the in-phase signal prior to the in-phase signal being received by said cross-correlator.
Claim 3
Dependent Claim 29 words
An apparatus as claimed in claim 1 , further comprising a switch to activate the spreader in a first mode, and to deactivate the spreader in a second mode.
Claim 4
Dependent Claim 21 words
An apparatus as claimed in claim 1 , further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 5
Dependent Claim 41 words
An apparatus as claimed in claim 1 , further comprising a switch to activate the spreader in a first mode, and to deactivate the spreader in a second mode, and a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 6
Independent Claim 38 words
An apparatus, comprising: a cross-correlator to receive an in-phase and a quadrature signal to provide cross-correlated in-phase and quadrature signals; and a spreader to spread the quadrature signal prior to the in-phase signal being received by said cross-correlator.
Claim 7
Independent Claim 38 words
An apparatus, comprising: a cross-correlator to receive an in-phase and a quadrature signal to provide cross-correlated in-phase and quadrature signals; and a spreader to spread the quadrature signal prior to the in-phase signal being received by said cross-correlator.
Claim 8
Dependent Claim 29 words
An apparatus as claimed in claim 5 , further comprising a switch to activate the spreader in a first mode, and to deactivate the spreader in a second mode.
Claim 9
Dependent Claim 21 words
An apparatus as claimed in claim 5 , further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 10
Dependent Claim 41 words
An apparatus as claimed in claim 5 , further comprising a switch to activate the spreader in a first mode, and to deactivate the spreader in a second mode, and a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 11
Independent Claim 58 words
An apparatus, comprising: a cross-correlator to receive an in-phase and a quadrature signal to provide cross-correlated in-phase and quadrature signals; and a first spreader to spread the in-phase signal prior to the in-phase signal being received by said cross-correlator; and a second spreader to spread the quadrature signal prior to the quadrature signal being received by said cross-correlator.
Claim 12
Independent Claim 58 words
An apparatus, comprising: a cross-correlator to receive an in-phase and a quadrature signal to provide cross-correlated in-phase and quadrature signals; and a first spreader to spread the in-phase signal prior to the in-phase signal being received by said cross-correlator; and a second spreader to spread the quadrature signal prior to the quadrature signal being received by said cross-correlator.
Claim 13
Dependent Claim 31 words
An apparatus as claimed in claim 9 , further comprising a switch to activate the first spreader in a first mode, and to deactivate the first spreader in a second mode.
Claim 14
Dependent Claim 31 words
An apparatus as claimed in claim 9 , further comprising a switch to activate the second spreader in a first mode, and to deactivate the second spreader in a second mode.
Claim 15
Dependent Claim 31 words
An apparatus as claimed in claim 9 , further comprising a first switch to activate and deactivate the first spreader, and a second switch to activate and deactivate the second spreader.
Claim 16
Dependent Claim 46 words
An apparatus as claimed in claim 9 , further comprising a first switch to activate and deactivate the first spreader, and a second switch to activate and deactivate the second spreader, said first and second switches to provide at least one or more modes of operation.
Claim 17
Dependent Claim 21 words
An apparatus as claimed in claim 9 , further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 18
Dependent Claim 45 words
An apparatus as claimed in claim 9 , further comprising a switch to activate the first spreader in a first mode, and to deactivate the first spreader in a second mode, and further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 19
Dependent Claim 45 words
An apparatus as claimed in claim 9 , further comprising a switch to activate the second spreader in a first mode, and to deactivate the second spreader in a second mode, and further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 20
Dependent Claim 45 words
An apparatus as claimed in claim 9 , further comprising a first switch to activate and deactivate the first spreader, and a second switch to activate and deactivate the second spreader, and further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.
Claim 21
Dependent Claim 60 words
An apparatus as claimed in claim 9 , further comprising a first switch to activate and deactivate the first spreader, and a second switch to activate and deactivate the second spreader, said first and second switches to provide at least one or more modes of operation, and further comprising a quadrature modulator to modulate the cross-correlated in-phase and quadrature signals.

References Cited (Backward Citations)

US3944926A Cited
US4339724A Cited
US4567602A Cited
US4644565A Cited
US4680777A Cited
US4849990A Cited
US5544167A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2008-08-08 2009-02-07 2009-08-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2012-08-08 2013-02-07 2013-08-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2016-08-08 2017-02-07 2017-08-09 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag