EP0302622A2
Expired / Lapsed
EP
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Method of communicating stuffing indications in a multi-level communications system
Assignee: Nortel Networks Ltd
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Filing: 1988-07-20
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Granted: —
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Expires: 2008-07-20
Abstract
Abstract In a QAM radio transmission system, stuffing indications for a transmitted stuffed data signal are transmitted only once rather than repeatedly. The two possible states of each stuffing indication are represented by respective sets of signal points in the signal point constellation, with a separation between any two signal points in the different sets which is at least three times the signal point separation of the system. The reliability with which the stuffing indications are sent is much greater than for other transmitted information.
Inventors
- 👤 John Duncan Mcnicol
- 👤 Iwan David Jemczyk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:24
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/345; H04L27/3461; H04L27/3477
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
129 words
A method of communicating selected information in a multi-level data communications system in which each communications symbol is constituted by one of more than two signal points in a predetermined signal point constellation, the signal points having a predetermined minimum separation therebetween, comprising the steps of: transmitting a first state of said selected information using any of a first set of one or more signal points in said constellation; and transmitting a second state of said selected information using any of a second set of one or more signal points in said constellation; wherein said first and second sets are selected so that each signal point in the first set is separated from each signal point in the second set by an amount greater than said predetermined minimum separation.
Claim 2
Independent Claim
129 words
A method of communicating selected information in a multi-level data communications system in which each communications symbol is constituted by one of more than two signal points in a predetermined signal point constellation, the signal points having a predetermined minimum separation therebetween, comprising the steps of: transmitting a first state of said selected information using any of a first set of one or more signal points in said constellation; and transmitting a second state of said selected information using any of a second set of one or more signal points in said constellation; wherein said first and second sets are selected so that each signal point in the first set is separated from each signal point in the second set by an amount greater than said predetermined minimum separation.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 wherein the predetermined signal point constellation has 2 n signal points, where n is a plural integer.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 2 wherein each of said first and second sets has 2 n-2 signal points.
Claim 5
Independent Claim
28 words
A method as claimed in any of claims 1 to 3 wherein the selected information comprises stuffing indications for a stuffed data signal communicated via the communcations system.
Claim 6
Independent Claim
28 words
A method as claimed in any of claims 1 to 4 wherein the communications system is an amplitude modulated system and the signal points comprise different amplitude levels.
Claim 7
Independent Claim
31 words
A method as claimed in any of claims 1 to 4 wherein the communications system is a quadrature amplitude modulated system and the signal points comprise different phase and amplitude states.
Claim 8
Independent Claim
38 words
A method as claimed in any of claims 1 to 3 wherein the communications system is a quadrature amplitude modulated system for communicating a stuffed data signal and the selected information comprises stuffing indications for the data signal.
Claim 9
Independent Claim
118 words
A method of representing stuffing indications for a stuffed data signal for transmission via a multi-level data transmission system, each stuffing indication comprising a first state or a second state, comprising representing the first state by a first combination of a plurality of bits and the second state by a second combination of a plurality of bits of a single symbol of the system, said first and second combinations corresponding respectively to first and second sets of signal points in a signal point constellation of the system, each signal point in the first set being separated from each signal point in the second set by an amount greater than a predetermined minimum signal point separation of the system.
Claim 10
Independent Claim
118 words
A method of representing stuffing indications for a stuffed data signal for transmission via a multi-level data transmission system, each stuffing indication comprising a first state or a second state, comprising representing the first state by a first combination of a plurality of bits and the second state by a second combination of a plurality of bits of a single symbol of the system, said first and second combinations corresponding respectively to first and second sets of signal points in a signal point constellation of the system, each signal point in the first set being separated from each signal point in the second set by an amount greater than a predetermined minimum signal point separation of the system.
Claim 11
Dependent Claim
41 words
A method as claimed in claim 8 wherein the separation of each signal point in the first set from each signal point in the second set is at least substantially three times said predetermined minimum signal point separation of the system.
Claim 12
Dependent Claim
20 words
A method as claimed in claim 8 or 9 wherein each of said first and second combinations comprises two bits.
Claim 13
Independent Claim
27 words
A method as claimed in any of claims 8 to 10 wherein the signal point constellation has 2 n signal points, where n is a plural integer.
Claim 14
Dependent Claim
16 words
A method as claimed in claim 11 wherein n is equal to or greater than 4.
Claim 15
Independent Claim
66 words
A method of transmitting stuffing indications for a stuffed data signal in a multi-level transmission system, comprising the step of transmitting each stuffing indication only once using signal points of a single transmitted symbol to represent different states of the stuffing indication, the signal points representing said different states having a minimum separation which is greater than a predetermined minimum signal point separation of the system.
Claim 16
Independent Claim
66 words
A method of transmitting stuffing indications for a stuffed data signal in a multi-level transmission system, comprising the step of transmitting each stuffing indication only once using signal points of a single transmitted symbol to represent different states of the stuffing indication, the signal points representing said different states having a minimum separation which is greater than a predetermined minimum signal point separation of the system.
Claim 17
Dependent Claim
35 words
A method as claimed in claim 13 wherein the signal points representing said different states have a minimum separation which is at least substantially three times said predetermined minimum signal point separation of the system.
Claim 18
Dependent Claim
21 words
A method as claimed in claim 13 or 14 wherein the transmission system is a quadrature amplitude modulated radio transmission system.
References Cited (Backward Citations)
No citation records indexed.
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