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在信息化高速发展的今天,由于2G系统及蜂窝网的普及带动了用户数的增加,更加由于3G的上市和4G技术的研发使得目前的通信系统已不能满足用户的需求。而现实的情况是,空中频率资源有限,新的利用有效利用频谱的技术还不成熟。因而,系统容量如何增加是一个非常重要的问题。于是从数字调制方式入手,能不能找到一种高效的调制方式使频谱利用率变高呢。基于比较成熟的调制方式而言,QAM调制能够达到这样的要求,合理有效的利用有限的频带,达到高效调制的母的。采用Verilog HDL语言编写程序,用FPGA进行实现QAM调制方式,文中采取全数字正交幅度调制方法。并采用QuartusII仿真工具进行了模拟仿真,得出正确的结论,作为全数字调制系统的实现,具有其可行性和先进性。
In today’s rapid development of information technology, the popularity of 2G systems and cellular networks has led to an increase in the number of users. More and more, due to the market launch of 3G and the development of 4G technologies, the current communication systems can no longer meet the needs of users. The reality is that the limited frequency of air resources, the new use of effective use of spectrum technology is not yet mature. Therefore, how to increase the system capacity is a very important issue. So start from the digital modulation, can find an efficient modulation to make the spectrum utilization rate higher. Based on the more mature modulation methods, QAM modulation can meet such a requirement that a reasonable and effective use of a limited frequency band can achieve a highly efficient modulation of the mother. Using Verilog HDL language programming, using FPGA to achieve QAM modulation, the article adopts all-digital quadrature amplitude modulation method. And the simulation is done by QuartusII simulation tool, and the correct conclusion is drawn. As the realization of digital modulation system, it has its feasibility and advanced.