US7133471B2
Expired / Lapsed
US
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Demodulation of multiple signals
Assignee: Quarterhill Inc
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Filing: 2005-12-05
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Granted: 2006-11-07
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Expires: 2025-12-05
Abstract
Abstract A demodulation system for receiving and demodulating multiple modulated signals, including a first modulated signal having a first bit rate and/or a first modulation format and a second modulated signal having a second bit rate and/or a second modulation format. The demodulator demodulating the first modulation format modulated signal provides a cross-correlated demodulated in-phase and quadrature-phase baseband signal and the demodulator demodulating the second modulation format modulated signal provides a second demodulated baseband signal. A selector selects either the first or the second or both bit rate and/or modulation format demodulated baseband signals. In an alternative embodiment two demodulators are implemented for the demodulation of multiple signals. In certain embodiments the demodulator demodulating the first bit rate modulated signal or the second bit rate modulated signal is comprised of bit rate switchable filters and/or mis-matched filters which are mismatched to that of the filters of the modulator of the first or the second bit rate modulated signal. In some of the applications the first or the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal and/or a spread spectrum modulated signal and/or Phase Shift Keying (PSK) modulation, or a Quadrature Modulation (QM), or a Frequency Modulation (FM) modulated signal. In certain implementations and applications the demodulator is used for demodulation of Gaussian Minimum Shift Keying (GMSK) modulated signals and spread spectrum modulated signals.
Inventors
- 👤 Kamilo Feher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:21
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/0008; H04B; H04B1/00; H04B1/69; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0602; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0854; H04L1/00; H04L1/20; H04L1/205; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03025; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H04L27/0004; H04L27/01; H04L27/18; H04L27/186; H04L27/20; H04L27/2003; H04L27/2007; H04L27/2017; H04L27/32; H04L27/34; H04L5/00; H04L5/0001; H04L5/0003; H04L5/0005; H04L5/0007; H04L5/0008; H04L5/0028; H04L7/00; H04L7/0008; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70703; H04B2201/70707; H04L2025/0335; H04L2025/03375; H04L2025/03401; H04L2025/03407; H04L2025/03414; H04L2025/03433; H04L2025/03439; H04L2025/03445; H04L2025/03471; H04L2025/03477; H04L25/03038; H04L25/0305; H04L25/03057; H04L25/0307; H04L27/26; H04L27/2601; H04L27/2626; H04L27/2627; H04L27/2637; H04L5/0014; H04L5/0016
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
74 words
A demodulation system comprising: a network for receiving a first modulated signal having a first bit rate and a second modulated signal having a second bit rate; a demodulator demodulating the first bit rate modulated signal providing cross-correlated demodulated in-phase and quadrature-phase baseband signals and demodulating the second bit rate modulated signal providing a demodulated baseband signal; a selector for selecting either the first or the second or both bit rate demodulated baseband signals.
Claim 2
Dependent Claim
74 words
A demodulation system comprising: a network for receiving a first modulated signal having a first bit rate and a second modulated signal having a second bit rate; a demodulator demodulating the first bit rate modulated signal providing cross-correlated demodulated in-phase and quadrature-phase baseband signals and demodulating the second bit rate modulated signal providing a demodulated baseband signal; a selector for selecting either the first or the second or both bit rate demodulated baseband signals.
Claim 3
Dependent Claim
31 words
The demodulation system as in claim 1 wherein the demodulator demodulating the first bit rate modulated signal or the second bit rate modulated signal is comprised of bit rate switchable filters.
Claim 4
Dependent Claim
38 words
The demodulation system as in claim 1 wherein the demodulator demodulating the first bit rate modulated signal is comprised of mis-matched filters which are mismatched to the filters of the modulator of the first bit rate modulated signal.
Claim 5
Dependent Claim
24 words
The demodulation system as in claim 1 wherein the first or the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
Claim 6
Dependent Claim
21 words
The demodulation system as in claim 1 wherein the first or the second modulated signal is a spread spectrum modulated signal.
Claim 7
Dependent Claim
32 words
The demodulation system as in claim 1 wherein the first modulated signal is a Gaussian Minimum Shift Keying (GMSK) modulated signal and the second modulated signal is a spread spectrum modulated signal.
Claim 8
Dependent Claim
23 words
The demodulation system as in claim 1 wherein the first or the second modulated signal is a Frequency Shift Keying (FSK) modulated signal.
Claim 9
Dependent Claim
81 words
A demodulation system comprising: a network for receiving a first modulated signal having a first modulation format and a second modulated signal having a second modulation format; a demodulator for demodulating the first modulated signal and the second modulated signal and for providing cross-correlated demodulated in-phase and quadrature phase baseband signals corresponding to the first modulated signal and for providing demodulated baseband signals corresponding to the second modulated signal; a selector for selecting either the first or the second demodulated signals.
Claim 10
Dependent Claim
81 words
A demodulation system comprising: a network for receiving a first modulated signal having a first modulation format and a second modulated signal having a second modulation format; a demodulator for demodulating the first modulated signal and the second modulated signal and for providing cross-correlated demodulated in-phase and quadrature phase baseband signals corresponding to the first modulated signal and for providing demodulated baseband signals corresponding to the second modulated signal; a selector for selecting either the first or the second demodulated signals.
Claim 11
Dependent Claim
27 words
The demodulation system as in claim 8 wherein the demodulator demodulating the first modulated signal or the second modulated signal is comprised of bit rate switchable filters.
Claim 12
Dependent Claim
34 words
The demodulation system as in claim 8 wherein the demodulator demodulating the first modulation signal is comprised of mis-matched filters which are mismatched to the filters of the modulator of the first modulated signal.
Claim 13
Dependent Claim
24 words
The demodulation system as in claim 8 wherein the first or the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
Claim 14
Dependent Claim
21 words
The demodulation system as in claim 8 wherein the first or the second modulated signal is a spread spectrum modulated signal.
Claim 15
Dependent Claim
34 words
The demodulation system as in claim 8 wherein the first or the second modulated signal is a Phase Shift Keying (PSK) modulation, or a Quadrature Modulation (QM), or a Frequency Modulation (FM) modulated signal.
Claim 16
Dependent Claim
65 words
A receiver and demodulation system comprising: a network for receiving a first and a second modulated signal; a first demodulator for demodulating the first modulated signal and for providing demodulated cross-correlated in-phase and quadrature-phase baseband signals; a second demodulator for demodulating the second modulated signal and for providing a demodulated baseband signal; a selector for selecting either the first or the second demodulated baseband signal.
Claim 17
Dependent Claim
65 words
A receiver and demodulation system comprising: a network for receiving a first and a second modulated signal; a first demodulator for demodulating the first modulated signal and for providing demodulated cross-correlated in-phase and quadrature-phase baseband signals; a second demodulator for demodulating the second modulated signal and for providing a demodulated baseband signal; a selector for selecting either the first or the second demodulated baseband signal.
Claim 18
Dependent Claim
32 words
The receiver and demodulation system as in claim 14 wherein the first demodulator is comprised of mis-matched filters which are mismatched to the filters of the modulator providing the first modulated signal.
Claim 19
Dependent Claim
23 words
The receiver and demodulation system as in claim 14 wherein the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
Claim 20
Dependent Claim
23 words
The receiver and demodulation system as in claim 14 wherein the first or the second modulated signal is a spread spectrum modulated signal.
Claim 21
Dependent Claim
34 words
The receiver and demodulation system as in claim 14 wherein the first modulated signal is a Gaussian Minimum Shift Keying (GMSK) modulated signal and the second modulated signal is a spread spectrum modulated signal.
Claim 22
Dependent Claim
25 words
The receiver and demodulation system as in claim 14 wherein the first or the second modulated signal is a Frequency Shift Keying (FSK) modulated signal.
Claim 23
Dependent Claim
36 words
The receiver and demodulation system as in claim 14 wherein the first or the second modulated signal is a Phase Shift Keying (PSK) modulation, or a Quadrature Modulation (QM), or a Frequency Modulation (FM) modulated signal.
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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) | 2009-11-06 | 2010-05-08 | 2010-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-11-06 | 2014-05-08 | 2014-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-11-06 | 2018-05-08 | 2018-11-07 | $7700.00 | Window Closed / Lapsed |