摘要
广义空间调制(Generalized spatial modulation,GSM)技术通过选择部分发射天线来传输信息,该系统由于部分天线保持静默而造成系统传输速率低。为了提高系统的传输速率,将GSM系统的所有发射天线均激活,但该系统在接收端依旧很难恢复出发射信号。为了达到传输速率与系统性能这两方面的平衡,本文提出双模广义空间调制系统,该系统将每时隙发送的信息比特分为索引比特和星座调制比特,利用索引比特将所有发射天线分为两组,将两种可分辨的星座调制符号分别放在两组天线上同时进行发送,在接收端采用最大似然算法(Maximum likelihood,ML)进行检测解调得到发送符号。通过分析与仿真表明,在误比特率为10-3时,双模广义空间调制系统与发射总功率且传输速率均相同的GSM系统和多输入多输出(Multiple input multiple output,MIMO)系统相比,前者采用低阶调制方式来最大化星座点间的欧氏距离,将获得约4 dB的增益,后者在接收端可通过功率索引来提升检测算法性能,将获得约2 dB的增益。
Generalized spatial modulation(GSM)technology transmits information by selecting part of the transmitting antenna. This system has a low transmission rate due to some antennas remaining silent. To improve the transmission rate of the system,all the transmitting antennas of the GSM are activated. The system still can hardly recover the transmitted signal at the receiving end. In this paper,a two-mode generalized spatial modulation system is proposed,the information bits sent in each time slot of the system are divided into index bits and constellation modulation bits,and all transmitting antennas are divided into two groups by the index bit. Two distinguishable constellation modulation symbols are transmitted simultaneously on two groups of antennas. The maximum likelihood(ML)algorithm is used to detect and demodulate the transmission symbol at the receiver. The proposed system achieves the balance between transmission efficiency and system performance. Analysis and simulation show that when the bit error rate is 10-3,the dual-mode generalized spatial modulation system is compared with the GSM and the multiple input multiple output(MIMO)system with same total transmit power and transmission rate. The former adopts low-order modulation to maximize the Euclidean distance between constellation points,which can obtain a gain of about 4 dB,while the latter can improve the performance of detection algorithm through power index at the receiver end,which can obtain a gain of about 2 dB.
作者
王相相
冯兴乐
韩佳倩
WANG Xiangxiang;FENG Xingle;HAN Jiaqian(School of Information Engineering,Chang’an University,Xi’an 710064,China)
出处
《数据采集与处理》
CSCD
北大核心
2021年第6期1157-1166,共10页
Journal of Data Acquisition and Processing
关键词
双模广义空间调制
索引调制
星座模式
功率分配
传输速率
dual-mode generalized spatial modulation
index modulation
constellation pattern
power splitting
transmission speed