广义空—码联合索引调制

Generalized space code joint index modulation

针对空间调制天线利用率低、广义空间调制传输速率低等问题,将广义空间调制和码索引调制相结合,提出广义空-码联合索引调制(generalised space code joint index modulation,GSCJIM)。信息比特在发射端经串并转换后分别映射为伪随机(pseudo noise,PN)码索引、天线索引以及调制符号,调制符号的实部和虚部分别选择激活的伪随机码进行扩频,并通过激活的天线组合将信号发射出去。广义空间调制和码索引调制的结合,提升系统传输速率的同时也提高了天线的利用率,并且抗干扰性能显著增强。分析与仿真结果表明,在传输速率相同时,GSCJIM比广义空间调制节省了索引资源,并且当误比特率为10^-3时具备5dB的性能优势。

To solve the problems of space modulation antenna utilization and generalized spatial modulation transmission rate are low. This paper proposed a generalized space code joint index modulation, which combined generalized spatial modulation and code index modulation. It respectively mapped information bits into a (pseudo noise) PN code index, an antenna index and a modulation symbols after series-to-parallel conversion at the transmitting end. The real and imaginary parts of the modulation symbols respectively selected the activated pseudorandom code to spread spectrum, and transmitted the signals through an activated antenna combination. The combination of generalized spatial modulation and code index modulation improved the transmission rate of the system and the utilization of the antenna. In addition, it significantly enhanced the antijamming performance. The analysis and simulation results show that GSCJIM saves index resource more than generalized space modulation at the same transmission rate, and it has the performance advantage of 5 dB when bit error rate is 10^-3 .