Patent ID: 7826548

Claim:
A method of transmitting more than one signal in a wireless communication system, the method comprising: allocating multiple symbols to a first layer signal constellation and a second layer signal constellation, wherein the first layer signal constellation refers to base layer signals and the second layer signal constellation refers to enhancement layer signals; modulating the multiple symbols of the first layer signal constellation and the second layer signal constellation, wherein the multiple symbols of the second layer signal constellation are rotated by a rotation angle determined based on an optimal rotation angle provided by a receiver; and transmitting the modulated symbols to the receiver, wherein configuration information used for modulating the multiple symbols is provided to the receiver in a control message, wherein the configuration information comprises an indicator indicating whether the rotation angle by which the multiple symbols of the second layer signal constellation are rotated is included in the control message, and further comprises the rotation angle if the indicator indicates that the rotation angle is included in the control message.