The differential chaotic shift keying （DCSK） communication in multiple input multiple output （MIMO） multipath fading chan- nels is considered. A simple MIMO-DCSK communication scheme based on orthogonal multi-cod...The differential chaotic shift keying （DCSK） communication in multiple input multiple output （MIMO） multipath fading chan- nels is considered. A simple MIMO-DCSK communication scheme based on orthogonal multi-codes （OMCs） and equal gain combination （EGC） is proposed, in which OMCs are used to spread the same information bit at each transmitting antenna and the infor- mation bit is detected by EGC at receiving antenna. The OMCs are constructed from one chaotic sequence by means of othogo- nal space-time block coding （OSTBC）. The output signal-to-noise ratio （SNR） after EGC is given based on central limit theory （CLT）, and it can effectively exploit the spatial diversity of the underlying MIMO system. Simulation results show that the full spatial diversity gain is achieved without channel estimation in the MIMO-DCSK communication scheme and it performs better than MC-EGC for a large number of transmitting antennas.展开更多
针对正交码移键控(code shift keying,CSK)误比特率(bit error rate,BER)性能下降和非正交码索引调制(non-orthogonal-code index modulation,N-CIM)未能充分利用扩频码自相关性的不足,提出一种非正交CSK和码索引调制(non-orthogonal-CS...针对正交码移键控(code shift keying,CSK)误比特率(bit error rate,BER)性能下降和非正交码索引调制(non-orthogonal-code index modulation,N-CIM)未能充分利用扩频码自相关性的不足,提出一种非正交CSK和码索引调制(non-orthogonal-CSK-code index modulation,N-CSK-CIM)算法。发送端信息比特分为调制比特和扩频码映射比特;调制比特用来进行符号调制,映射比特映射为扩频码的索引和码相位索引。首先根据调制比特进行符号调制,然后利用映射比特映射的扩频码索引选择同一原始扩频码,并根据码相位索引进行码移键控产生新的扩频码,调制后的符号实部与虚部分别用这一新的扩频码进行扩频。仿真结果表明,在加性高斯白噪声(additive white Gaussian noise,AWGN)信道和瑞利衰落信道中,相同信噪比时,N-CSK-CIM算法的BER性能优于N-CIM算法和正交CSK算法。展开更多
基金supported by the National Natural Science Foundation of China(61101097)
文摘The differential chaotic shift keying （DCSK） communication in multiple input multiple output （MIMO） multipath fading chan- nels is considered. A simple MIMO-DCSK communication scheme based on orthogonal multi-codes （OMCs） and equal gain combination （EGC） is proposed, in which OMCs are used to spread the same information bit at each transmitting antenna and the infor- mation bit is detected by EGC at receiving antenna. The OMCs are constructed from one chaotic sequence by means of othogo- nal space-time block coding （OSTBC）. The output signal-to-noise ratio （SNR） after EGC is given based on central limit theory （CLT）, and it can effectively exploit the spatial diversity of the underlying MIMO system. Simulation results show that the full spatial diversity gain is achieved without channel estimation in the MIMO-DCSK communication scheme and it performs better than MC-EGC for a large number of transmitting antennas.
文摘针对正交码移键控(code shift keying,CSK)误比特率(bit error rate,BER)性能下降和非正交码索引调制(non-orthogonal-code index modulation,N-CIM)未能充分利用扩频码自相关性的不足,提出一种非正交CSK和码索引调制(non-orthogonal-CSK-code index modulation,N-CSK-CIM)算法。发送端信息比特分为调制比特和扩频码映射比特;调制比特用来进行符号调制,映射比特映射为扩频码的索引和码相位索引。首先根据调制比特进行符号调制,然后利用映射比特映射的扩频码索引选择同一原始扩频码,并根据码相位索引进行码移键控产生新的扩频码,调制后的符号实部与虚部分别用这一新的扩频码进行扩频。仿真结果表明,在加性高斯白噪声(additive white Gaussian noise,AWGN)信道和瑞利衰落信道中,相同信噪比时,N-CSK-CIM算法的BER性能优于N-CIM算法和正交CSK算法。
