Patent ID: 7953033

Claim:
A method of signalling between communication equipments in a communication system adapted to transmit first data from a first communication equipment to a second communication equipment by modulating a carrier signal according to a first set of constellation points having a first minimum distance between constellation points corresponding to first and second values of the first data, the method comprising: transmitting first and second data simultaneously by modulating the carrier signal according to a second set of constellation points arranged in a constellation plane, wherein the second set of constellation points is arranged such that: a first subset of the second set of constellation points located in a first part of the constellation plane correspond to a first value of the first data; a second subset of the second set of constellation points located in a second part of the constellation plane correspond to a second value of the first data; wherein each of the first and second subsets comprises constellation points corresponding to at least first and second values of the second data; and wherein the minimum distance between the constellation points of the first subset and the constellation points of the second subset is not less than the first minimum distance.