US4517680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error vector normalizer
Assignee: Paradyne Corp
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Filing: 1983-02-23
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Granted: 1985-05-14
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Expires: 2003-02-23
Abstract
Abstract This invention pertains to a digital modem having a normalizer for normalizing the output of the modem demodulator to a predetermined range. The modem generates a signal vector corresponding to each received signal in a complex plane. The normalizer then generates a normalizing factor corresponding to the radius of the signal vector which then is multiplied with the demodulator output.
Inventors
- 👤 William Betts
- 👤 Wesley H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/144; H04L27/152; H04L27/1525
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
In a modem in which a signal vector is generated which corresponds to a received data signal in a complex plane, a vector normalizer comprising: means for deriving a normalizing signal indicative of the radius of said signal vector; means for deriving a normalizing factor from said normalizing signal which depends on the inverse of said radius; and multiplying means for multiplying said signal vector with said normalizing factor to obtain a normalized vector signal.
Claim 2
Dependent Claim
75 words
In a modem in which a signal vector is generated which corresponds to a received data signal in a complex plane, a vector normalizer comprising: means for deriving a normalizing signal indicative of the radius of said signal vector; means for deriving a normalizing factor from said normalizing signal which depends on the inverse of said radius; and multiplying means for multiplying said signal vector with said normalizing factor to obtain a normalized vector signal.
Claim 3
Dependent Claim
62 words
The normalizer of claim 1 wherein said means for generating said normalizing signal comprises: means for generating the real component of said signal vector; means for generating the imaginary component of said signal vector; first squaring means for squaring said real component; second squaring means for squaring said imaginary component; and means for adding the square of the real and imaginary components.
Claim 4
Dependent Claim
52 words
The normalizer of claim 1 wherein said means for deriving a normalizer factor comprises: a decoding means for generating an address corresponding to said normalizing signal and a look-up means in which normalizing factors are stored and which is adapted to select one of said normalizing factors in accordance with said address.
Claim 5
Dependent Claim
52 words
The normalizer of claim 2 wherein said means for deriving a normalizer factor comprises: a decoding means for generating an address corresponding to said normalizing signal and a look-up means in which normalizing factors are stored and which is adapted to select one of said normalizing factors in accordance with said address.
References Cited (Backward Citations)
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |