US5400322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Updating of bit allocations in a multicarrier modulation transmission system
Assignee: Silicon Valley Bank Inc
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Filing: 1993-08-20
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Granted: 1995-03-21
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Expires: 2013-08-20
Abstract
Abstract Allocations of bits per transmission symbol to subchannels in a transmission system using multicarrier modulation are updated in response to requests from a receiver to a transmitter of the system, each request identifying a carrier whose bit allocation can be increased and a carrier whose bit allocation can be decreased, so that the total number of bits per symbol can be increased, decreased, or be unchanged. In order to synchronize bit allocation changes, a transmitted symbol counter at the transmitter and a received symbol counter at the receiver maintain synchronized symbol counts. In response to a request for a change in bit allocations, the transmitter sends a future symbol count value to the receiver, and the transmitter and the receiver implement the change when their respective counters match this count value.
Inventors
- 👤 Ronald R. Hunt
- 👤 Peter S. Chow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/20; H04L1/206; H04L5/00; H04L5/003; H04L5/0044; H04L1/004; H04L1/0056; H04L1/0059; H04L1/006; H04L1/12; H04L1/16; H04L1/18; H04L1/1829; H04L1/1858
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
92 words
A method of changing a parameter of a transmission system using multicarrier modulation, comprising the steps of: identifying symbols transmitted by the system by a symbol count; communicating between a transmitter and a receiver of the system information identifying a change in said parameter and a symbol count value for implementing said change; implementing said change at the transmitter in response to a transmitted symbol having a symbol count matching said value; and implementing said change at the receiver in response to a received symbol having a symbol count matching said value.
Claim 2
Independent Claim
92 words
A method of changing a parameter of a transmission system using multicarrier modulation, comprising the steps of: identifying symbols transmitted by the system by a symbol count; communicating between a transmitter and a receiver of the system information identifying a change in said parameter and a symbol count value for implementing said change; implementing said change at the transmitter in response to a transmitted symbol having a symbol count matching said value; and implementing said change at the receiver in response to a received symbol having a symbol count matching said value.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 wherein the parameter comprises a number of bits per symbol allocated to a subchannel of the system.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 wherein the parameter comprises a signal power of a subchannel of the system.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1 wherein the step of identifying symbols comprises maintaining a count identifying transmitted symbols at the transmitter and maintaining a count identifying received symbols at the receiver.
Claim 6
Dependent Claim
75 words
A method as claimed in claim 4 and comprising synchronizing the counts at the transmitter and receiver by the steps of: transmitting symbols in accordance with a predetermined criterion from the transmitter and setting the count at the transmitter to a predetermined state in dependence upon such transmission; and detecting received symbols satisfying the predetermined criterion at the receiver and setting the count at the receiver to the predetermined state in dependence upon such detection.
Claim 7
Dependent Claim
18 words
A method as claimed in claim 5 wherein the predetermined criterion comprises a negation between two consecutive symbols.
Claim 8
Dependent Claim
66 words
A method as claimed in claim 1 wherein the step of communicating comprises sending a request for a change from the receiver to the transmitter, the request identifying at least one subchannel of the system and a change in a parameter relating to that subchannel, and sending the symbol count value for implementing the change from the transmitter to the receiver in response to the request.
Claim 9
Dependent Claim
22 words
A method as claimed in claim 7 wherein the request and the symbol count value are each sent a plurality of times.
Claim 10
Dependent Claim
40 words
A method as claimed in claim 7 wherein the parameter comprises a number of bits per symbol allocated to a subchannel and the request identifies two subchannels for making complementary changes in the numbers of bits per symbol allocated thereto.
Claim 11
Dependent Claim
34 words
A method as claimed in claim 9 and including the step of monitoring performance of subchannels at the receiver and determining the request for a change at the receiver in dependence upon the monitoring.
Claim 12
Dependent Claim
43 words
A method as claimed in claim 1 and including the step of monitoring performance of subchannels of the system at the receiver and determining a request for a change in a parameter of the system at the receiver in dependence upon the monitoring.
Claim 13
Independent Claim
104 words
A method of updating bit allocations to subchannels in a transmission system using multicarrier modulation, comprising the steps of: maintaining a count identifying transmitted symbols at a transmitter of the system; maintaining a synchronized count identifying received symbols at a receiver of the system; communicating between the transmitter and the receiver information identifying a change of bit allocations to subchannels and a symbol count value; implementing the change at the transmitter in response to the count identifying transmitted symbols matching the symbol count value; and implementing the change at the receiver in response to the count identifying received symbols matching the symbol count value.
Claim 14
Independent Claim
104 words
A method of updating bit allocations to subchannels in a transmission system using multicarrier modulation, comprising the steps of: maintaining a count identifying transmitted symbols at a transmitter of the system; maintaining a synchronized count identifying received symbols at a receiver of the system; communicating between the transmitter and the receiver information identifying a change of bit allocations to subchannels and a symbol count value; implementing the change at the transmitter in response to the count identifying transmitted symbols matching the symbol count value; and implementing the change at the receiver in response to the count identifying received symbols matching the symbol count value.
Claim 15
Dependent Claim
75 words
A method as claimed in claim 12 and comprising synchronizing the counts at the transmitter and receiver by the steps of: transmitting symbols in accordance with a predetermined criterion from the transmitter and setting the count at the transmitter to a predetermined state in dependence upon such transmission; and detecting received symbols satisfying the predetermined criterion at the receiver and setting the count at the receiver to the predetermined state in dependence upon such detection.
Claim 16
Dependent Claim
18 words
A method as claimed in claim 13 wherein the predetermined criterion comprises a negation between two consecutive symbols.
Claim 17
Dependent Claim
67 words
A method as claimed in claim 12 wherein the step of communicating comprises sending a request for a change from the receiver to the transmitter, the request identifying at least one subchannel of the system and a change in a bit allocation relating to that subchannel, and sending the symbol count value for implementing the change from the transmitter to the receiver in response to the request.
Claim 18
Dependent Claim
22 words
A method as claimed in claim 15 wherein the request and the symbol count value are each sent a plurality of times.
Claim 19
Dependent Claim
26 words
A method as claimed in claim 15 wherein the request identifies two subchannels for making complementary changes in the numbers of bits per symbol allocated thereto.
Claim 20
Dependent Claim
34 words
A method as claimed in claim 17 and including the step of monitoring performance of subchannels at the receiver and determining the request for a change at the receiver in dependence upon the monitoring.
Claim 21
Dependent Claim
40 words
A method as claimed in claim 12 and including the step of monitoring performance of subchannels of the system at the receiver and determining a request for updating bit allocations to subchannels at the receiver in dependence upon the monitoring.
Claim 22
Dependent Claim
126 words
A transmission system using multicarrier modulation, comprising: a transmitter including a modulator for modulating multiple carriers each with an individually allocated number of data bits per transmission symbol, the transmitter including a transmitted symbol counter for counting transmitted symbols and a control unit for updating a number of data bits allocated to a carrier at a time dependent upon a count of the transmitted symbol counter; and a receiver including a demodulator for demodulating the carriers to derive the allocated numbers of data bits from the multiple carders, the receiver including a received symbol counter for counting received symbols and a control unit for updating a number of data bits derived from a carder at a time dependent upon a count of the received symbol counter.
Claim 23
Dependent Claim
126 words
A transmission system using multicarrier modulation, comprising: a transmitter including a modulator for modulating multiple carriers each with an individually allocated number of data bits per transmission symbol, the transmitter including a transmitted symbol counter for counting transmitted symbols and a control unit for updating a number of data bits allocated to a carrier at a time dependent upon a count of the transmitted symbol counter; and a receiver including a demodulator for demodulating the carriers to derive the allocated numbers of data bits from the multiple carders, the receiver including a received symbol counter for counting received symbols and a control unit for updating a number of data bits derived from a carder at a time dependent upon a count of the received symbol counter.
References Cited (Backward Citations)
US5023869A
Cited
US5293401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |