Modulation method and apparatus for signal transmission and reception in mobile communication system

A method of signal reception for a receiver device in a mobile communication system, the method comprising:

• receiving, from a transmitter device, a signal;
• identifying the modulation scheme of the received signal;
• identifying a sequence corresponding to the received signal from a sequence set used to modulate the received signal based on the modulation scheme and a correlator associated with the sequence set;
• and
• demodulating the received signal based on the identified sequence and the log likelihood ratio (LLR) corresponding to the received signal.

A transmitter device in a mobile communication system, comprising:

• a transceiver configured to transmit and to receive a signal;
• and
• a controller configured to:
• control the transceiver,
• identify a modulation scheme for data transmission,
• identify a level for quadrature amplitude modulation (QAM) based on the identified modulation scheme,
• identify an amplitude and phase of a carrier wave based on the QAM level and data to be transmitted, and
• identifying, if the identified modulation scheme is a first scheme, a length of sequences, selecting a sequence according to the data to be transmitted among sequences of the identified length, and generate modulated symbol corresponding to the data to be transmitted based on the selected sequence, the amplitude of the carrier wave and the phase of the carrier wave.

A receiver device in a mobile communication system, comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• control the transceiver,
• receive, from a transmitter device, a signal
• identify the modulation scheme of the received signal
• identify a sequence corresponding to the received signal from a sequence set used to modulate the received signal based on the modulation scheme and a correlator associated with the sequence set;
• and
• demodulate the received signal based on the identified sequence and the log likelihood ratio (LLR) corresponding to the received signal.