Apparatus and method for interference cancellation in a wireless communication system

A symbol demapping method for interference cancellation in a wireless communication system, comprising:

• generating decision signal points including decision signal points based on a modulation scheme and a virtual signal point added to a zero point;
• and
• mapping and outputting a signal point nearest to a position of an input complex value as a target decision signal point among the decision signal points based on the modulation scheme and the virtual signal point.

A receiver for interference cancellation in a wireless communication system, comprising:

• an interference canceller for generating decision signal points including decision signal points based on a modulation scheme and a virtual signal point added to a zero point and regenerating and outputting an interfering signal for interference cancellation from a received signal, the interference canceller comprising:
• a symbol demapper for comparing a magnitude of a complex value of the received signal with a threshold based on system setting, mapping and outputting the virtual signal point of the zero point as a target decision signal point when the magnitude of the complex value is less than the threshold, and mapping and outputting one of the decision signal points based on the modulation scheme according to the complex value when the magnitude of the complex value is greater than or equal to the threshold.

A receiver for interference cancellation in a wireless communication system, comprising:

• an interference canceller for generating decision signal points including decision signal points based on a modulation scheme and a virtual signal point added to a zero point and regenerating and outputting an interfering signal for interference cancellation from a received signal, the interference canceller comprising:
• a symbol demapper for mapping and outputting a signal point nearest to a position of an input complex value as a target decision signal point among the decision signal points based on the modulation scheme and the virtual signal point.