Non-orthogonal-code Index Modulation
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摘要: 针对码索引调制(Code Index Modulation, CIM)相对于直接序列扩频在提升频谱利用率时，造成误比特率性能明显下降的问题，该文提出非正交-码索引调制(Non-orthogonal-Code Index Modulation, N-CIM)。发射端信息比特分割为伪随机(Pseudo Noise, PN)码映射块和调制信息块，并分别映射为PN码的索引和调制符号，调制符号的实部与虚部再选择相同的激活的PN码进行扩频。仿真与分析结果表明，在相同频谱效率时，N-CIM的误比特率性能比CIM在加性高斯白噪声信道中当误比特率为10–5时具备约2～3 dB的优势，在瑞利衰落信道中当误比特率为10–2时具备约2 dB的优势。Abstract: To deal with the problem that the bit error rate reduces obviously when the Code Index Modulation (CIM) is used to improve spectrum utilization, a novel Non-orthogonal-Code Index Modulation (N-CIM) is proposed. The bit stream of the transmitter is divided into mapping block of Pseudo Noise (PN) code and informational block of modulation, which are mapped into the index of the PN code and modulation symbol respectively. The real part and imaginary part of the modulation symbol are spread by selecting the identical activate PN code. Simulation and analysis results show that N-CIM outperforms CIM by about 2~3 dB in additive white Gaussian noise channel when the bit error rate is 10–5, and N-CIM outperforms CIM by about 2 dB in Rayleigh fading channel when the bit error rate is 10–2 at the same spectral efficiency.
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表 1 PN码索引表
PN码映射块( ${{{d}}_{s,i}}$ )
PN码索引(编号) 000 ${{{w}}_1}$ 
001 ${{{w}}_2}$ 
010 ${{{w}}_3}$ 
011 ${{{w}}_4}$ 
100 ${{{w}}_{\rm{5}}}$ 
101 ${{{w}}_{\rm{6}}}$ 
110 ${{{w}}_{\rm{7}}}$ 
111 ${{{w}}_{\rm{8}}}$ 
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