摘要
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。
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 M OFDM symbols, one pilot OFDM symbol inserted time-spaced in all-frequency is used to transmit the reference chaotic signal and the other M - 10FDM 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 OFDM symbol and the other M - 10FDM symbols in each block size of M are 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-carrler 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.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2015年第2期52-57,共6页
Journal of National University of Defense Technology
基金
国家自然科学基金资助项目(61101097)
武器装备预研基金资助项目(9140A25030113KG01359)
关键词
多载波混沌键控
差分混沌键控
MIMO
空间分集
频率分集
multi-carrier chaotic shift keying
differential chaos shift keying
MIMO
spatial diversity gain
frequent diversity gain
