US5396519A
Expired / Lapsed
US
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Method and apparatus for adaptively providing precoding and preemphasis conditioning to signal data for transfer over a communication channel
Assignee: TELECOMM INNOVATIONS LLC
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Filing: 1993-10-22
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Granted: 1995-03-07
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Expires: 2013-10-22
Abstract
Abstract The relative amounts of additive white noise and proportional noise in a communication channel are compensated for by providing adaptive precoding and preemphasis to signal point signals. The amounts of precoding and preemphasis are controlled using scalars to modify the magnitudes of the precoding and preemphasis signals that are combined with the signal point signals. The values of the scalars are transferred between the transmitter and receiver, and the values can be changed without losing synchronization between the transmitter and receiver.
Inventors
- 👤 William L. Betts
- 👤 Edward S. Zuranski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:39
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/3405; H04L27/3416; H04L27/3427; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03343; H04L25/03993; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4927; H04L25/497; H04L25/4975
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
185 words
A method of transmitting data over a communication channel between a transmitter and a receiver, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point value; generating a precoding value by performing a modulo operation on a first filter output obtained using a first plurality of prior precoded signal point values; modifying said precoding value using a first scalar value to generate a modified precoding value, said first scalar value being transferred between the transmitter and the receiver; combining said modified precoding value and said signal point value to generate a precoded signal point value; generating a modified preemphasis value using a second scalar value and a second filter output obtained from a second filter using a second plurality of prior modified signal point values representative of prior transmitted signal points, said second scalar value being transferred between the transmitter and the receiver; and combining said precoded signal point value, and said modified preemphasis value to form a modified signal point value, said modified signal point value being transferred to the receiver.
Claim 2
Independent Claim
185 words
A method of transmitting data over a communication channel between a transmitter and a receiver, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point value; generating a precoding value by performing a modulo operation on a first filter output obtained using a first plurality of prior precoded signal point values; modifying said precoding value using a first scalar value to generate a modified precoding value, said first scalar value being transferred between the transmitter and the receiver; combining said modified precoding value and said signal point value to generate a precoded signal point value; generating a modified preemphasis value using a second scalar value and a second filter output obtained from a second filter using a second plurality of prior modified signal point values representative of prior transmitted signal points, said second scalar value being transferred between the transmitter and the receiver; and combining said precoded signal point value, and said modified preemphasis value to form a modified signal point value, said modified signal point value being transferred to the receiver.
Claim 3
Dependent Claim
26 words
The method of claim 1, further comprising the step of measuring proportional noise and changing said second scalar value to increase preemphasis when proportional noise increases.
Claim 4
Dependent Claim
26 words
The method of claim 1, further comprising the step of measuring additive noise and changing said first scalar value to increase precoding when additive noise increases.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein a sum of said first and second scalar values equals one.
Claim 6
Dependent Claim
25 words
A method of claim 1, wherein said step modifying said precoding value comprises using said first scalar to modify a coefficient of said first filter.
Claim 7
Dependent Claim
26 words
The method of claim 1, wherein said step generating said modified preemphasis value comprises using said second scalar to modify a coefficient of said second filter.
Claim 8
Independent Claim
153 words
A method of transmitting data over a communication channel between a transmitter and a receiver, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point value; generating a precoding value by performing a modulo operation on a filter output obtained using a plurality of prior modified signal point values representative of prior transmitted signal points; modifying said precoding value using a first scalar value to generate a modified precoding value, said first scalar value being transferred between the transmitter and the receiver; generating a modified preemphasis value using a second scalar value and said filter output, said second scalar value being transferred between the transmitter and the receiver; and combining said signal point value, said modified precoding value and said modified preemphasis value to form a modified signal point value, said modified signal point value being transferred to the receiver.
Claim 9
Independent Claim
153 words
A method of transmitting data over a communication channel between a transmitter and a receiver, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point value; generating a precoding value by performing a modulo operation on a filter output obtained using a plurality of prior modified signal point values representative of prior transmitted signal points; modifying said precoding value using a first scalar value to generate a modified precoding value, said first scalar value being transferred between the transmitter and the receiver; generating a modified preemphasis value using a second scalar value and said filter output, said second scalar value being transferred between the transmitter and the receiver; and combining said signal point value, said modified precoding value and said modified preemphasis value to form a modified signal point value, said modified signal point value being transferred to the receiver.
Claim 10
Dependent Claim
26 words
The method of claim 7, further comprising the step of measuring proportional noise and changing said second scalar value to increase preemphasis when proportional noise increases.
Claim 11
Dependent Claim
26 words
The method of claim 7, further comprising the step of measuring additive noise and changing said first scalar value to increase precoding when additive noise increases.
Claim 12
Dependent Claim
17 words
The method of claim 7, wherein a sum of said first and second scalar values equals one.
Claim 13
Independent Claim
120 words
A method of communicating data over a communication channel, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point signal; generating a precoding signal using a first scalar to control a magnitude of said precoding signal, said first scalar having a first value communicated to a receiver; generating a preemphasis signal using a second scalar to control a magnitude of said preemphasis signal, said second scalar having a second value communicated to the receiver; forming a modified signal point signal using said signal point signal, said preemphasis signal and said precoding signal; and transmitting a signal representative of said modified signal point signal over the communication channel.
Claim 14
Independent Claim
120 words
A method of communicating data over a communication channel, comprising the steps of: selecting a signal point from a predefined signal point constellation using a data word to generate a signal point signal; generating a precoding signal using a first scalar to control a magnitude of said precoding signal, said first scalar having a first value communicated to a receiver; generating a preemphasis signal using a second scalar to control a magnitude of said preemphasis signal, said second scalar having a second value communicated to the receiver; forming a modified signal point signal using said signal point signal, said preemphasis signal and said precoding signal; and transmitting a signal representative of said modified signal point signal over the communication channel.
Claim 15
Dependent Claim
42 words
The method of claim 11, wherein said step of generating a precoding signal comprises using a first filter and a plurality of prior signal point signals to generate a first filter output; and performing a modulo operation on said first filter output.
Claim 16
Dependent Claim
19 words
The method of claim 12, wherein said step of generating said preemphasis signal comprises using said first filter output.
Claim 17
Dependent Claim
26 words
The method of claim 11, wherein said step of generating said preemphasis signal comprises using a second filter and said plurality of prior signal point signals.
Claim 18
Dependent Claim
16 words
The method of claim 11, wherein a sum of said first and second values equals one.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |