CAJ | 학술논문

为提高差分混沌键控的传输效率及其在衰落信道下的传输性能，提出了多载波混沌键控及类差分混沌键控检测方法，发射端每隔 M个 OFDM符号间隔插入由混沌参考信号构成的“导频”，在此间隔内其他 M－1个 OFDM符号即以此混沌参考信号生成的混沌键控信号，接收端提取“导频”并将之与其他 OFDM符号进行相关积分，恢复出 M－1比特信息。进一步给出了 MIMO 多径衰落信道下的多载波混沌键控分集发射与接收方法，发射端采用不同混沌信号以获得一定的发射分集增益，接收端不需要任何信道先验信息，对各天线的相关积分输出进行等增益合并，可获得空间分集增益和频域分集增益。性能分析和计算机仿真表明，在“导频”插入间隔大于2的情况下，多载波混沌键控的功率效率大于差分混沌键控，且传输性能优于差分混沌键控。
위제고차분혼돈건공적전수효솔급기재쇠락신도하적전수성능，제출료다재파혼돈건공급류차분혼돈건공검측방법，발사단매격 M개 OFDM부호간격삽입유혼돈삼고신호구성적“도빈”，재차간격내기타 M－1개 OFDM부호즉이차혼돈삼고신호생성적혼돈건공신호，접수단제취“도빈”병장지여기타 OFDM부호진행상관적분，회복출 M－1비특신식。진일보급출료 MIMO 다경쇠락신도하적다재파혼돈건공분집발사여접수방법，발사단채용불동혼돈신호이획득일정적발사분집증익，접수단불수요임하신도선험신식，대각천선적상관적분수출진행등증익합병，가획득공간분집증익화빈역분집증익。성능분석화계산궤방진표명，재“도빈”삽입간격대우2적정황하，다재파혼돈건공적공솔효솔대우차분혼돈건공，차전수성능우우차분혼돈건공。
To improve the frequency efficiency and the transmission performance of differential chaos shift keying under wireless fading channel,a multi-carrier chaotic shift keying communication scheme is proposed.In each block size of MOFDMsymbols,one pilot OFDMsymbol inserted time-spaced in all-frequency is used to transmit the reference chaotic signal and the other M-1 OFDM symbols is used to transmit the information-bearing signals,which spread by the reference chaotic signal.At the receiver,a differential detector is constructed and the information bits from the correlations between the pilot OFDMsymbol and the other M-1 OFDMsymbols in each block size of Mare recovered.A multi-carrier chaotic shift keying transceiver under MIMO multipath fading channels with no channel state information is presented,in which a distinct chaotic sequence at each transmit antenna is used to spread the same data symbol and the detection statistics at each receive antenna are combined with equal gain for symbol detection.Both performance analysis and computer simulations show that multi-carrier chaotic shift keying outperforms differential chaos shift keying in additive white Gaussian noise channels with high bandwidth efficiency for the block size of M>2 and that multi-carrier chaotic shift keying achieves both spatial diversity gain and frequent diversity gain under MIMO multipath fading channels.