基于VOFDM的编码调制系统在IMT-Advanced信道中的性能研究

发布时间：2018-04-22 15:50

本文选题：IMT-Advanced信道模型 + VOFDM　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：在第四代移动通信系统标准的高级国际移动通信(IMT-Advanced)中,我们采用的信道是以空间信道模型(Space Channel Model,SCM)为基础进行场景扩展与修正之后得到的信道模型。IMT-Advanced信道模型充分结合了空间传输特性,采用了几何射线跟踪法对信号在信道中的传输过程进行模拟,从而可以充分体现IMT-Advanced信道在空间、时间以及频率上的特性。本文首先完成的研究工作是根据国际电信联盟(ITU)M.2135标准文件中的参数要求通过软件设计实现的方式对IMT-Advanced空间信道模型进行具体的建模,具体的软件建模方式是通过使用Windows环境下的C/C++来完成。其中对信道模型的编程设计内容主要是围绕大、小尺度衰落模型两部分,然后通过两部分计算结果的整合进行信道相应的计算从而完成对信道特性的仿真分析与研究。其次,本论文研究该模型下基于矢量正交频分复用(VOFDM)的宽带无线传输技术的性能。由于VOFDM系统主要是用于对抗多径效应对信号传输造成的影响,而高斯信道基于VOFDM和OFDM采用编码调制系统的性能应该是一致的,我们首先通过一次仿真来说明。接下来我们在已经建好的IMT-Advanced信道模型基础上进行多径信道的扩展,并分别采用VOFDM技术结合频域均衡方法以及OFDM技术结合频域均衡方法来对抗多径效应恢复原始信号,并通过采用不同编码方案下进行了具体的系统仿真。最后对仿真得到的结果进行对比分析,得出VOFDM系统抗衡多径效应的能力优于OFDM系统的结论。
[Abstract]:In IMT-Advanced, the fourth-generation standard for mobile communication systems, The channel we adopt is based on the space Channel model (SCM). The channel model. IMT-Advanced channel model, which is based on the scene expansion and modification, fully integrates the spatial transmission characteristics. The geometric ray tracing method is used to simulate the transmission process of the signal in the channel, so that the characteristics of the IMT-Advanced channel in space, time and frequency can be fully reflected. The first research work of this paper is to model the IMT-Advanced spatial channel model by software design and implementation according to the requirements of the parameters in ITU M.2135 standard document of the International Telecommunication Union (ITU). Specific software modeling is done by using C / C in the Windows environment. The programming design of channel model is mainly focused on two parts: large scale and small scale fading model. Then the channel characteristic is simulated and studied by integrating the results of the two parts. Secondly, this paper studies the performance of wideband wireless transmission technology based on vector orthogonal frequency division multiplexing (VOFDM). Because VOFDM system is mainly used to counter the influence of multipath effect on signal transmission, the performance of coding modulation system based on VOFDM and OFDM in Gao Si channel should be consistent. Then we extend the multipath channel based on the established IMT-Advanced channel model, and adopt VOFDM technology combined with frequency domain equalization method and OFDM technology combined frequency domain equalization method to counteract the multipath effect to recover the original signal, respectively. And through adopting different coding scheme to carry on the concrete system simulation. Finally, the simulation results are compared and analyzed, and it is concluded that the VOFDM system is superior to the OFDM system in its ability to counteract the multipath effect.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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