【作者】 付雷；

【导师】 黄秋元；

【作者基本信息】 武汉理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 收发机是通信系统中不可缺少的一部分,而射频前端则是收发机的重中之重,应用十分广泛。在民用中,基站通信系统、车载通信系统都需要宽带射频前端。在军用中,以雷达为代表的导航系统同样对宽带系统有着广泛的需求。无论军用和民用,宽带射频技术在无线通信中都占据着日益重要的位置。随着技术的发展,特别是3G技术的提出,使得早前使用的模拟宽带收发系统无法满足现代通信的需求,如果将射频信号数字化称为收发系统发展首要问题。直接将射频信号数字化的技术仍然难以实现,但随着软件无线电理论的发展,将射频信号转换为可数字化的中频信号成为宽带数字收发机最为有效的方法,而射频前端的设计则是宽带数字收发机设计中的关键。本文借助基于TDSCDMA系统的基站收发机的设计阐述宽带数字收发机射频前端的设计原理和设计方法。本文所研究的主要内容包括:(1)结合本课题的设计要求,通过相关分析,提出了在接收机部分采用单中频结构,在发射机部分采用直接上变频结构的收发机系统方案。这种结构不仅大大节约了成本,而且减小了电路占用面积,使得设计更为简约,降低了射频系统的复杂度,同时也最大限度的降低了设计成本。(2)通过分析基站系统的技术指标,通过理论分析,确定系统各部分的参数需求,并结合当前芯片的发展水平,分别给出了单中频接收机和零中频发射机部分的芯片选型,并进行了相应的电路设计。(3)完成了收发信机前端PCB板的仿真与优化设计。本课题实现了2GHz频段的射频电路板设计。考虑到射频系统的设计成本较高,产品周期较长,本文借助射频仿真软件ADS软件对收发机系统进行仿真,验证系统的可行性。并在实际布板过程中,使用ADS软件对射频阻抗部分进行优化,提高了射频性能,并通过测试验证了设计的有效性。(4)使用相关测试仪器分别对系统的噪声系数、互调和端口阻抗等进行了测试,测试结果验证了系统设计的正确性,符合基站系统的参数要求。更多还原

【Abstract】 Transceiver machine communication system is an indispensable part of which is the front-end RF transceiver may be the most important application of a very wide range.In civilian,the base station communications systems,automotive communications systems require broadband RF front-end.In the military,as represented by the radar navigation system similar to the broadband system has a wide range of needs.Both military and civilian,broadband RF technology in wireless communications in both occupy an increasingly important position.As technology development,especially in the 3 G technology that makes use of earlier broadband transceiver simulation of modern communication systems can not meet the demand,if the radio signal known as digital transceiver system development a priority.RF signals directly to digital technology is still difficult to achieve,but with the development of software radio,the radio signal will be converted to digital signals into the IF broadband digital transceiver the most effective way,while the RF front-end design is the broadband digital transceiver Design of the key.TDSCDMA paper-based system with the base station transceiver on the design of broadband digital transceiver RF front-end design principle and design methods.The content of this paper are as follows:(1)In light of the subject design requirements,through the relevant analysis,in the part of a single-IF receiver structure,the use of direct part in the transmitter on the frequency of the transceiver system solutions.This structure not only greatly cost savings,but also reduces the circuit area occupied,making more compact design, reducing the complexity of RF systems,but also to maximize the reduction of the design costs.(2)Through analysis of the technical indicators of the base station,through theoretical analysis to determine the parameters of the system demand,combined with the current level of development of chips,were given a single-IF receiver and transmitter is part of the chip IF selection,and For the corresponding circuit design. (3)Completed a front-end transceiver PCB board the aircraft simulation and optimization of the design.The issue achieved a 2 GHz band RF circuit board design. Taking into account the radio frequency system design costs higher,longer product life cycle,the paper using simulation software radio transceiver ADS software system for simulation,verification system is feasible.And in the actual process of cloth panels,the use of ADS RF impedance part of the software to optimize and improve the RF performance,and tested the effectiveness of the design verification.(4)Were related to the use of test equipment for the noise factor,and mutual reconciliation,such as a port impedance test results proved the correctness of the system design,in line with the parameters of the base station system requirements.更多还原