二维空码索引调制算法

摘要

针对正交空间调制(QSM)提升传榆速率时天线的使用数量增加,需要耗费大量资源且实现困难的问题,提出二维空码正交索引调制(SCOIM).发射端信息比特分别映射为伪随机(PN)码的索引、天线的索引以及调制符号,调制符号的同相部分和正交部分再分别选择激活的PN码进行扩频,并各自通过激活的天线将信号发射出去.分析和仿真结果表明,相同传输速率时,SCOIM比正交空间调制节约至少一半的索引资源且随着传输速率的提升节约效果成倍增加,并且当误码率为10-4时具备约5 dB的性能优势.%To deal with the problem that the number of antennas increases when Quadrature Spatial Modulation (QSM) improves the transmission rate,which requires a lot of resources and makes it difficult to achieve,a two-dimensional Space Code Orthogonal Index Modulation (SCOIM) was proposed.The transmitter information bits were mapped to the Pseudo Noise (PN) code index,the antenna index and the modulation symbol respectively.The in-phase part and orthogonal part of the modulation symbol spreaded spectrum through selecting activated PN code respectively,and were transmitted by activated antennas respectively.Analysis and simulation results show that in the comparison experiments with QSM,the index resource of SCOIM can be saved at least half at the same transmission rate and the saving increases exponentially with the increase of transmission rate.What's more,SCOIM has a performance advantage of about 5 dB when the bit error rate is 10-4.