Method for modulating and demodulating signal and apparatus for the same
In accordance with the present invention, in transmitting and receiving data symbols, a transmitter diffuses (or spreads) each of the data symbols in a two-dimensional resource group, modulates each of the data symbols diffused in the two-dimensional resource group, and transmits the modulated data...
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Main Authors | , , , |
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Format | Patent |
Language | English Korean |
Published |
28.06.2021
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Subjects | |
Online Access | Get full text |
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Summary: | In accordance with the present invention, in transmitting and receiving data symbols, a transmitter diffuses (or spreads) each of the data symbols in a two-dimensional resource group, modulates each of the data symbols diffused in the two-dimensional resource group, and transmits the modulated data symbols. In addition, in receiving the data symbols, a receiver demodulates received signals and reversely diffuses (or despreads) the demodulated symbols diffused in the two-dimensional resource group with respect to each of the data symbols. To overcome delay spread and/or Doppler spread channel degradation, the receiver may perform channel equalization for the reversely diffused demodulated symbols after demodulation and/or may perform channel equalization for the back-diffused data symbols. The present invention tolerates interference among the data symbols to a proper level and enhances the diversity gain of a channel.
본 발명에서는 데이터 심볼들을 송수신하는데 있어, 송신기는 각 데이터 심볼을 2차원 자원 그룹 내에 확산(또는 스프레딩(spreading)) 시키고 2차원 자원 그룹 내에 확산된 각 데이터 심볼들을 변조시켜 송신한다. 또한 데이터 심볼들을 수신하는데 있어, 수신기는 수신 신호를 복조하고 각 데이터 심볼에 대해 2차원 자원 그룹 내에 확산된 복조 심볼들을 역확산(또는 디스프레딩(despreading)) 시킨다. 지연 스프레드 그리고/또는 도플러 스프레드 채널 열화를 극복하기 위해, 수신기는 복조 후 역확산된 복조 심볼들에 채널 등화를 수행하고/수행하거나 역확산된 데이터 심볼들에 채널 등화를 수행할 수 있다. |
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Bibliography: | Application Number: KR20200172901 |