US5678213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver for processing a multi-carrier signal with a large dynamic range
Assignee: Nokia of America Corp
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Filing: 1994-09-30
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Granted: 1997-10-14
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Expires: 2014-09-30
Abstract
Abstract A radio receiver front end is disclosed that processes a multi-carrier signal with a large dynamic range. An illustrative embodiment of the present invention incorporates both feedforward and feedback mechanisms to suppress the amplitude of spurious carrier signals so as to prevent those signals from flooding the dynamic range of the mixer that mixes down the multi-carrier signal.
Inventors
- 👤 Robert Evan Myer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:28
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/10; H04B1/109
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
147 words
A method for processing a multi-carrier signal comprising a plurality of carriers, said method comprising: splitting said multi-carrier signal to create a first signal and a second signal, such that said first signal and said second signal are each substantial analog representations of said multi-carrier signal; mixing down said first signal with a first oscillatory signal to create a mixed-down signal; filtering said mixed-down signal to suppress at least a portion of said mixed down signal to create a filtered signal; mixing-up said filtered signal with a second oscillatory signal to create a mixed-up signal; forming a suppression signal based on the vector difference of said second signal minus said mixed-up signal; forming a difference signal based on the vector difference of a delayed first signal minus said suppression signal; and mixing down said difference signal based on a third oscillatory signal to create an output signal.
Claim 2
Independent Claim
147 words
A method for processing a multi-carrier signal comprising a plurality of carriers, said method comprising: splitting said multi-carrier signal to create a first signal and a second signal, such that said first signal and said second signal are each substantial analog representations of said multi-carrier signal; mixing down said first signal with a first oscillatory signal to create a mixed-down signal; filtering said mixed-down signal to suppress at least a portion of said mixed down signal to create a filtered signal; mixing-up said filtered signal with a second oscillatory signal to create a mixed-up signal; forming a suppression signal based on the vector difference of said second signal minus said mixed-up signal; forming a difference signal based on the vector difference of a delayed first signal minus said suppression signal; and mixing down said difference signal based on a third oscillatory signal to create an output signal.
Claim 3
Dependent Claim
14 words
The method of claim 1 further comprising the step of filtering said output signal.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein said steps of filtering said mixed-down signal and filtering said output signal utilize bandpass filters.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein said bandpass filters have passbands of 30 KHz.
Claim 6
Dependent Claim
14 words
The method of claim 3 wherein said bandpass filters have passbands of 1.25 MHz.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said first oscillatory signal, said second oscillatory signal and said third oscillatory signal have substantially the same frequency.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein said first oscillatory signal, said second oscillatory signal and said third oscillatory signal are identical.
Claim 9
Dependent Claim
14 words
The method of claim 1 further comprising the step of amplifying said suppression signal.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein the unwanted carrier signals are suppressed by at least 20 dB.
Claim 11
Independent Claim
106 words
An apparatus for processing a multi-carrier signal, said apparatus comprising: a first mixer for mixing down said multi-carrier signal with a first oscillatory signal to create a mixed-down signal; a second mixer for mixing up said mixed-down signal with a second oscillatory signal to create a mixed-up signal; means for forming a suppression signal based on the vector difference of said multi-carrier signal minus said mixed-up signal; means for forming a modified signal based on the vector difference of said multi-carrier signal minus said suppression signal; and a third mixer for mixing down said modified signal with a third oscillatory signal to produce an output signal.
Claim 12
Independent Claim
106 words
An apparatus for processing a multi-carrier signal, said apparatus comprising: a first mixer for mixing down said multi-carrier signal with a first oscillatory signal to create a mixed-down signal; a second mixer for mixing up said mixed-down signal with a second oscillatory signal to create a mixed-up signal; means for forming a suppression signal based on the vector difference of said multi-carrier signal minus said mixed-up signal; means for forming a modified signal based on the vector difference of said multi-carrier signal minus said suppression signal; and a third mixer for mixing down said modified signal with a third oscillatory signal to produce an output signal.
Claim 13
Dependent Claim
26 words
The apparatus of claim 10 further comprising: a first bandpass filter for filtering said mixed-down signal; and a second bandpass filter for filtering said output signal.
Claim 14
Dependent Claim
22 words
The apparatus of claim 11 wherein said first bandpass filter and said second bandpass filter each have a passband of 25 KHz.
Claim 15
Dependent Claim
22 words
The apparatus of claim 12 wherein said first bandpass filter and said second bandpass filter each have a passband of 1.25 MHz.
Claim 16
Dependent Claim
24 words
The apparatus of claim 10 further comprising an oscillator for creating said first oscillatory signal, said second oscillatory signal and said third oscillatory signal.
Claim 17
Dependent Claim
24 words
The apparatus of claim 10 wherein said first oscillatory signal, said second oscillatory signal and said third oscillatory signal each have the same frequency.
Claim 18
Dependent Claim
21 words
The apparatus of claim 15 wherein said first oscillatory signal, said second oscillatory signal and said third oscillatory signal are identical.
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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) | 2000-10-13 | 2001-04-14 | 2001-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-13 | 2005-04-14 | 2005-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-13 | 2009-04-14 | 2009-10-14 | $7700.00 | Window Closed / Lapsed |