APPARATUS AND METHOD FOR MODULATION/DEMODULATION FOR TRANSMITTING AND RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM
First Claim
1. A modulation method in a transmitter that transmits a signal in a wireless communication system, the modulation method comprising:
- determining a modulation scheme;
converting encoded information bits to quadrature amplitude modulation (QAM) symbols according to a predetermined QAM modulation order if the determined modulation scheme corresponds to a particular modulation scheme;
selecting a sequence corresponding to an element of an integer vector in a predetermined sequence set, repeating the converted QAM symbols for a predetermined sequence length;
outputting a signal by multiplying the repeated QAM symbols by the selected sequence; and
transmitting the output signal to a receiver.
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Abstract
The present disclosure relates to a 5G or pre-5G communication system to be provided for supporting a higher data transmission rate beyond 4G communication systems such as LTE. A method for modulation in a transmitter for transmitting a signal in a wireless communication system according to an embodiment of the present invention comprises: a step for determining a modulation scheme; a step for, if the determined modulation scheme corresponds to a specific modulation scheme, converting encoded information bits to quadrature amplitude modulation (QAM) symbols in accordance with a predetermined QAM modulation order, selecting a sequence corresponding to an element of an integer vector in a predetermined sequence set, repeating the converted QAM symbols for a predetermined sequence length, and outputting signals by multiplying the repeated QAM symbols and the selected sequence; and a step for transmitting the outputted signals to a receiver.
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Citations
30 Claims
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1. A modulation method in a transmitter that transmits a signal in a wireless communication system, the modulation method comprising:
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determining a modulation scheme; converting encoded information bits to quadrature amplitude modulation (QAM) symbols according to a predetermined QAM modulation order if the determined modulation scheme corresponds to a particular modulation scheme; selecting a sequence corresponding to an element of an integer vector in a predetermined sequence set, repeating the converted QAM symbols for a predetermined sequence length; outputting a signal by multiplying the repeated QAM symbols by the selected sequence; and transmitting the output signal to a receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A demodulation method in a receiver that receives a signal in a wireless communication system, the demodulation method comprising:
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receiving a signal from a transmitter; extracting sequence information corresponding to the received signal from a sequence set based on a correlation corresponding to the sequence set, predetermined in the transmitter; and demodulating the received signal based on the received signal and a log likelihood ratio (LLR) calculation result corresponding to the sequence information, wherein the received signal is a signal obtained by converting encoded information bits into quadrature amplitude modulation (QAM) symbols according to a predetermined QAM modulation order, selecting a sequence corresponding to an element of an integer vector in a predetermined sequence set, repeating the converted QAM symbols for a predetermined sequence length, and outputting a signal by multiplying the repeated QAM symbols by the selected sequence. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A transmitter that modulates and transmits a signal in a wireless communication system, the transmitter comprising:
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a modulator configured to determine a modulation scheme, to convert encoded information bits to quadrature amplitude modulation (QAM) symbols according to a predetermined QAM modulation order if the determined modulation scheme corresponds to a particular modulation scheme, to select a sequence corresponding to an element of an integer vector in a predetermined sequence set, to repeat the converted QAM symbols for a predetermined sequence length, and to output a signal by multiplying the repeated QAM symbols by the selected sequence; and a transmission unit configured to transmit the output signal to a receiver. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A receiver that receives and demodulates a signal in a wireless communication system, the receiver comprising:
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a reception unit configured to receive a signal from a transmitter; a correlator configured to extract sequence information corresponding to the received signal from a sequence set based on a correlation corresponding to the sequence set, predetermined in the transmitter; and a demodulator configured to demodulate the received signal based on the received signal and a log likelihood ratio (LLR) calculation result corresponding to the sequence information, wherein the received signal is a signal obtained by converting encoded information bits into quadrature amplitude modulation (QAM) symbols according to a predetermined QAM modulation order, selecting a sequence corresponding to an element of an integer vector in a predetermined sequence set, repeating the converted QAM symbols for a predetermined sequence length, and outputting a signal by multiplying the repeated QAM symbols by the selected sequence. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification