求翻译：在通信技术日益发展的今天，人们对通信系统的性能和造价都提出了较高的要求，于是，仿真便应运而生。实际的通信系统是一个功能和结构相当复杂的系统，对这个系统做出的任何改变都可能影响到整个系统的性能和稳定。因此，在建立一个新系统或对原有通信系统进行改进之前，通常都需要对这个系统进行建模仿真，通过仿真结果可以分析方案的可行性并从中选择最合理的系统配置和参数设置，最后再应用到实际系统中。另外，仿真模型还具有较强的演示性和可视性。是什么意思？

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In the case of communications technology today, there is the growing development of communication system performance and cost requirements are a relatively high, thus, simulation thus came into being. Practical communication system is a functional and structural complexity of the system in this syst

Today flourishes more and more daily which in the communication, the people all set the high request to the communications system performance and the construction cost, therefore, the simulation then arises at the historic moment.The actual communications system is a function and the structure quite

Increasingly today with the development of communication technology, people's communication system's higher performance and cost requirements, so the simulation came into being. Practical communication system is a functional and structural complexity of the system, any change in the system can affec