Patent US4534026A successfully refreshed from Google Patents.
US4534026A
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Normalized error compensator for modems using radial amplitude modulation for multiplexing
Assignee: Paradyne Corp
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Filing: 1983-12-06
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Granted: 1985-08-06
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Expires: 2003-12-06
Abstract
Abstract In a receiver for multiplexed QAM/PSK signals which have been radial amplitude modulated for synchronization, an error signal is generated by each received signal to the corresponding ideal point as mapped in the complex plane. A synchronizing signal is generated and synchronized by the error signal and is used for both demultiplexing, and amplitude demodulating the signal.
Inventors
- 👤 Kenneth Martinez
- 👤 William L. Betts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A receiver for receiving a series of multiplexed data signals having radial amplitudes selected between a first and second value, every second signal having the same amplitude for demultiplex synchronization comprising: means for demodulating said multiplexed data signals to produce demodulated signals including means for determining an ideal point for each received signal as mapped in a complex plane; means for generating an error signal corresponding to said received data signals including means for determining the algebraic difference between said ideal point and the corresponding received signal; means for generating a synchronizing signal in accordance with said error signal; and means for demultiplexing said demodulated signals in accordance with said synchronizing signal.
Claim 2
Dependent Claim
112 words
A receiver for receiving a series of multiplexed data signals having radial amplitudes selected between a first and second value, every second signal having the same amplitude for demultiplex synchronization comprising: means for demodulating said multiplexed data signals to produce demodulated signals including means for determining an ideal point for each received signal as mapped in a complex plane; means for generating an error signal corresponding to said received data signals including means for determining the algebraic difference between said ideal point and the corresponding received signal; means for generating a synchronizing signal in accordance with said error signal; and means for demultiplexing said demodulated signals in accordance with said synchronizing signal.
Claim 3
Dependent Claim
20 words
The receiver of claim 1 further comprising means of amplitude demodulating said alternate signals in accordance with said synchronizing signal.
Claim 4
Dependent Claim
32 words
The receiver of claim 1 wherein said synchronizing signal generating means comprises monitoring means for monitoring said error signal and inverting the synchronizing signal when said error signal exceeds a predetermined limit.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |