Detector for multi-level modulated signal and detection method using the same, and iterative receiver for multi-level modulated signal and iteratively receiving method using the same

An iterative receiver for a multi-level modulated signal, the iterative receiver comprising:

• a channel estimator estimating a channel response of each of a plurality of bits included in at least one received signal based on multi-level modulation;
• a hard decision unit, for each bit, selecting at least one of the plurality of bits remaining by excluding the bit and performing a hard decision based on a pre-probability of the selected bit;
• a reliability calculator calculating reliability of each of all the bits in the received signal based on the received signal from which a hard-decided bit component is cancelled and the estimated channel response;
• and
• a channel decoder performing channel decoding based on the calculated reliability and generating soft decision information of each of the bits,
• wherein the hard decision unit uses the soft decision information as information on the pre-probability.

A detection method for a multi-level modulated signal, the detection method comprising:

• estimating a channel response of each of a plurality of bits included in at least one received signal based on multi-level modulation;
• for each bit, selecting at least one of the plurality of bits remaining by excluding the bit and performing a hard decision based on a pre-probability of the selected bit;
• and
• calculating reliability of each of all the bits in the received signal based on the received signal from which a hard-decided bit component is cancelled and the estimated channel response.

An iteratively receiving method for a multi-level modulated signal, the iteratively receiving method comprising:

• estimating a channel response of each of a plurality of bits included in at least one received signal based on multi-level modulation;
• for each bit, selecting at least one of the plurality of bits remaining by excluding the bit and performing a hard decision based on a pre-probability of the selected bit;
• calculating reliability of each of all the bits in the received signal based on the received signal from which a hard-decided bit component is cancelled and the estimated channel response;
• and
• performing channel decoding based on the calculated reliability and generating soft decision information of each of the bits,
• wherein in the selecting, the soft decision information is used as information on the pre-probability.