空间调制预编码MIMO系统性能研究

发布时间：2018-01-14 22:06

本文关键词：空间调制预编码MIMO系统性能研究　出处：《五邑大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着无线通信的发展和移动电话的增多,给用户提供无处不在的高质量通信服务是无线通信技术发展的根本动力,但是无线频谱资源的有限性、稀缺性使得探求高速、可靠的通信系统,成为了无线通信领域研究的热点和难点课题。多输入多输出(Multiple Input Multiple Output,MIMO)技术作为下一代无线通信领域的核心技术,与传统的单输入单输出(Single Input Single Output,SISO)技术相比,在配置、功耗和频谱带宽相同的情况下MIMO系统具有更出色的性能。由于大规模的MIMO系统中配置多根发送和接收天线,这样使得接收端在检测时复杂度大大提高。为了降低接收端检测时的计算复杂度,同时又不损失分集增益。本文设计了基于MMSE预编码空间调制MIMO系统,在接收端知道信道状态信息的情况下,选择适合的接收天线进行数据接收,这样既保证了系统的分集增益,又降低了系统的检测复杂度。空间调制(Spatial Modulation,SM)技术在利用传统调制符号携带信息的同时,还利用发送天线的空间位置携带信息。因此SM系统可以用较少的天线,发送较多的比特信息。为了提高SM-MIMO通信系统误码性能,本文提出了一种使用线性分组码设计发射天线星座图的MIMO系统方案,以(5,2)汉明码为例设计了两组最小码距分别为2和3的发射天线星座。仿真结果表明在传输速率相同时,本文设计的多天线通信系统在发射功率低于文献[27]时具有更好的误码性能,在实际应用在由于使用更少的发射链路,从而节约了硬件成本。为了进一步提高MIMO通信系统的误码性能,本文将以现有的理论知识为基础,结合空间调制、预编码、线性分组码和天线选择等技术,设计了误码性能更好的MIMO系统。本文设计的辅助天线协助发送码字的空间调制MIMO系统,并在瑞利衰落信道下计算了该MIMO系统的容量。仿真实验得出的系统误码率曲线表明:在功耗相同时辅助天线协助空间调制MIMO系统和传统的SM-MIMO系统相比,当误码率为410-时,有约4.8dB的增益。
[Abstract]:With the development of wireless communication and the increase of mobile phones, providing users with ubiquitous high-quality communication services is the fundamental driving force for the development of wireless communication technology, but the wireless spectrum resources are limited. Scarcity makes it possible to explore high-speed and reliable communication systems. It has become a hot and difficult topic in the field of wireless communication. Multiple Input Multiple Output. As the core technology of the next generation wireless communication field, Mimo technology is compared with the traditional single input and single output Input Single Output. SISO technology has better performance than MIMO systems with the same configuration, power consumption and spectrum bandwidth, due to the configuration of multiple transmit and receive antennas in large scale MIMO systems. In order to reduce the computational complexity of the receiver detection, the complexity of detection is greatly increased. At the same time, the diversity gain is not lost. This paper designs a MIMO system based on MMSE precoding space modulation. When the receiver knows the channel state information, it selects the appropriate receiving antenna to receive the data. This not only guarantees the diversity gain of the system, but also reduces the detection complexity of the system. Spatial modulation spatial Modulation. SMtechnology uses the traditional modulation symbols to carry information, and also uses the space position of the transmitting antenna to carry the information. Therefore, the SM system can use fewer antennas. In order to improve the BER performance of SM-MIMO communication system, this paper presents a scheme of MIMO system using linear block codes to design the transmit antenna constellation diagram in order to improve the BER performance of SM-MIMO communication system. 2) two groups of transmit antenna constellations with minimum code distances of 2 and 3 are designed for example. The simulation results show that the transmission power of the multi-antenna communication system designed in this paper is lower than that of the literature when the transmission rate is the same. [In order to further improve the error performance of MIMO communication system, the hardware cost is saved by using fewer transmission links. Based on the existing theoretical knowledge, this paper combines spatial modulation, precoding, linear block codes and antenna selection techniques. The MIMO system with better BER performance is designed. The auxiliary antenna is designed in this paper to assist in the spatial modulation MIMO system of code word transmission. The capacity of the MIMO system is calculated in Rayleigh fading channel. At the same power consumption, the auxiliary antenna assists the spatial modulation MIMO system compared with the traditional SM-MIMO system. When the BER is 410 -, the gain is about 4.8 dB.
【学位授予单位】：五邑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3

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