US6538986B2
Expired / Lapsed
US
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Data transmission system and method using nQAM constellation with a control channel superimposed on a user data channel
Assignee: RPX Corp
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Filing: 1997-09-01
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Granted: 2003-03-25
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Expires: 2017-09-01
Abstract
Abstract A transmission system using nQAM. A control channel is superimposed on a nQAM data channel. It is desirable to separate control channel data from user data without using a higher level protocol layer. In multi-carrier systems with variable bit-loading it is particularly desirable that the control channel data be separable from user data when the value of n. that is the bit-loading, or constellation identifier are unknown. Binary data is transmitted using nQAM modulation. The binary data includes both user data and control data. This means that a control channel is superimposed on a user data channel within the same nQAM constellation. Separation of the control data is facilitated by arranging control data points to have either a unique phase or unique amplitude values. These unique values are not employed for user data points.
Inventors
- 👤 Mikael Isaksson
- 👤 Magnus Johansson
- 👤 Harry Tonvall
- 👤 Lennart Olsson
- 👤 Tomas Stefansson
- 👤 Hans Ohman
- 👤 Gunnar Bahlenberg
- 👤 Anders Isaksson
- 👤 Goran Okvist
- 👤 Lis-Marie Ljunggren
- 👤 Tomas Nordstrom
- 👤 Lars-Ake Isaksson
- 👤 Daniel Bengtsson
- 👤 Siwert Hakansson
- 👤 Ye Wen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/003; H04L5/0058; H04L5/006; H04L27/00; H04L27/32; H04L27/34; H04L27/345; H04L27/3461; H04L5/0001; H04L5/0003; H04L5/0005; H04L5/0007; H04L5/0044; H04L5/0046; H04L1/00; H04L1/004; H04L1/0056; H04L1/0064; H04L1/0065; H04L1/0071
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A method of transmitting binary data using nQAM modulation onto a carrier wave, comprising: superimposing a control channel on a user data channel within an nQAM constellation so that the binary data includes both user data and control data; and arranging control data points to have unique phase values which are not used for user data points to facilitate the separation of the control data; the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation.
Claim 2
Independent Claim
93 words
A method of transmitting binary data using nQAM modulation onto a carrier wave, comprising: superimposing a control channel on a user data channel within an nQAM constellation so that the binary data includes both user data and control data; and arranging control data points to have unique phase values which are not used for user data points to facilitate the separation of the control data; the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation.
Claim 3
Dependent Claim
30 words
A method according to claim 1 , wherein the nQAM constellation is partitioned so that (log2n-1) bits are available for user data and two bits are available for control data.
Claim 4
Dependent Claim
14 words
A method according to claim 2 wherein the control data points define a 4QAM.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said control data points can be uniquely identified regardless of the value of n.
Claim 6
Dependent Claim
141 words
A data transmission system for transmitting binary data using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the system comprising: at least one transmitter for modulating the binary data, including the user data and control data, onto the carrier signal, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation; and at least one receiver for decoding the carrier signal having the control channel and user data channel modulated thereon.
Claim 7
Dependent Claim
141 words
A data transmission system for transmitting binary data using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the system comprising: at least one transmitter for modulating the binary data, including the user data and control data, onto the carrier signal, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation; and at least one receiver for decoding the carrier signal having the control channel and user data channel modulated thereon.
Claim 8
Dependent Claim
32 words
A data transmission system according to claim 5 , wherein the nQAM constellation is partitioned so that (log2n-1) bits are available for user data and two bits are available for control data.
Claim 9
Dependent Claim
16 words
A data transmission system according to claim 6 wherein that control data points define a 4QAM.
Claim 10
Dependent Claim
24 words
A data transmission system according to claim 5 , wherein the control data points can be uniquely identified regardless of the value of n.
Claim 11
Dependent Claim
21 words
A data transmission system according to claim 8 , wherein the data transmission system is a discrete multi-tone (DMT) transmission system.
Claim 12
Dependent Claim
28 words
A data transmission system according to claim 8 , wherein the data transmission system is a discrete multi-tone (DMT) based very high bit-rate digital subscriber line (VDSL) system.
Claim 13
Dependent Claim
51 words
A data transmission system according to claim 10 , wherein the at least one transmitter comprises a plurality of transmitters; wherein the at least one receiver comprises a plurality of receivers; and further comprising at least two transceivers each of which includes one of the transmitters and one of the receivers.
Claim 14
Dependent Claim
140 words
A receiver for receiving binary data that is transmitted using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the receiver comprising: means for decoding the nQAM modulated carrier signal having the control channel and the user data channel modulated thereon, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation; and means for separating the control channel from the user data channel without recourse to a higher layer protocol.
Claim 15
Dependent Claim
140 words
A receiver for receiving binary data that is transmitted using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the receiver comprising: means for decoding the nQAM modulated carrier signal having the control channel and the user data channel modulated thereon, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation; and means for separating the control channel from the user data channel without recourse to a higher layer protocol.
Claim 16
Dependent Claim
159 words
A transmitter for transmitting binary data using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the transmitter comprising: means for modulating the binary data onto the carrier signal as an nQAM constellation; said means for modulating modulates the control data onto the carrier as an mQAM constellation, where m is less than n, and the mQAM constellation includes a set of constellation points with the unique phase values which are not used for the modulation of user data, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation.
Claim 17
Dependent Claim
159 words
A transmitter for transmitting binary data using nQAM modulation onto a carrier signal, wherein the binary data comprises both user data and control data, so that a control channel is superimposed on a user data channel within an nQAM constellation, and in that separation of the control data is facilitated by arranging control data points to have unique phase values which are not used for user data points, the transmitter comprising: means for modulating the binary data onto the carrier signal as an nQAM constellation; said means for modulating modulates the control data onto the carrier as an mQAM constellation, where m is less than n, and the mQAM constellation includes a set of constellation points with the unique phase values which are not used for the modulation of user data, the unique phase values being substantially on boundaries between quadrants of the nQAM constellation and the user data points having phase values within quadrants of the nQAM constellation.
Claim 18
Dependent Claim
9 words
A transmitter according to claim 13 , wherein m=4.
Claim 19
Dependent Claim
9 words
A transmitter according to claim 13 , wherein n=6.
References Cited (Backward Citations)
US4627077A
Cited
US5022053A
Cited
US5105443A
Cited
US5214656A
Cited
US5243629A
Cited
US5388124A
Cited
US5418798A
Cited
US5652772A
Cited
US5444712A
Cited
DE4435833A1
Cited
US5751774A
Cited
US6137829A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-03-24 | 2006-09-23 | 2007-03-25 | $2000.00 | Window Closed / Lapsed |
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| 11.5 Years (Year 12) | 2014-03-24 | 2014-09-23 | 2015-03-25 | $7700.00 | Window Closed / Lapsed |