宽带WLAN多天线射频前端设计与实现

发布时间：2018-06-13 14:38

  本文选题：宽带WLAN + 射频前端　； 参考：《电子科技大学》2015年硕士论文

【摘要】：无线局域网(WLAN)是解决无线设备和互联网在短距离连接完成业务数据传输的最有效方法之一,随着无线互联网业务扩展和无线终端设备的快速普及,在面对高密集度接入和高并行的情况下,IEEE 802.11ac作为下一代WLAN标准之一,能够满足多用户对高速率、高吞吐量的需求。802.11ac标准主要特征包括:工作在5G频段、信道带宽最高支持160MHz、最多支持8空间流、理论最高传输速率达到6.93Gbps等。本文依据802.11ac标准物理层要求,主要研究宽带WLAN系统的射频前端部分,提出工作带宽665MHz和8发8收MIMO结构的宽带多天线射频前端具体设计与实现方案。主要工作内容包括:首先,总结了无线收发机常用结构优缺点和MIMO技术特点,根据802.11ac标准物理层要求对射频前端工作带宽、前端架构、噪声系数等主要技术参数进行分析,提出收发通道工程技术指标。其次,根据射频前端的功能需求划分子功能模块,采用八路相同的收发通道,讨论收发、本振模块链路结构设计方案和主要指标的具体实现方式,根据链路杂散要求提出定制介质滤波器的技术指标。再次,在总体设计要求下对射频前端进行详细设计。按照性能需求选择合适器件,对收发链路增益、线性度和杂散抑制等指标进行预算分析。完成校正链路收发切换、本振和增益控制等主要功能设计,同时对混频器、LNA和末级功放等关键器件进行优化。最后,完成射频前端的组装和调试,对主要功能和性能进行测试。通过测试验证,射频前端具备665MHz宽带信号收发、通道选择和通道校正功能,接收噪声系数为4.1dB,发射饱和功率29dBm,镜像抑制达到70dBc。本射频前端平台覆盖802.11ac全频段、采用8×8的MIMO架构,支持灵活的信道配置和空间流配置,为验证下一代WLAN技术提供了射频前端硬件支持,对WLAN技术的发展起到一定的推动作用。
[Abstract]:WLAN (WLAN) is one of the most effective methods to realize data transmission between wireless devices and Internet in short distance connection. With the expansion of wireless Internet services and the rapid popularization of wireless terminal devices, WLAN is one of the most effective methods to solve the problem. In the face of high density access and high parallelism, IEEE 802.11ac, as one of the next generation WLANs, can meet the demand of multi-user for high speed and high throughput. The main features of 802.11ac standard include: working in 5G band. The channel bandwidth can support up to 160 MHz and up to 8 spatial streams, and the theoretical maximum transmission rate is 6.93 Gbps. According to the requirements of 802.11ac standard physical layer, this paper mainly studies the RF front-end part of broadband WLAN system, and proposes a design and implementation scheme of broadband multi-antenna RF front-end with a bandwidth of 665MHz and 8 transmit / receive MIMO architecture. The main work includes: firstly, the advantages and disadvantages of wireless transceiver structure and the characteristics of MIMO technology are summarized. According to the requirements of 802.11ac standard physical layer, the main technical parameters such as RF front-end bandwidth, front-end architecture, noise coefficient and so on are analyzed. The technical specifications of the transceiver channel are put forward. Secondly, according to the functional requirements of the RF front-end, the sub-functional modules are divided, and eight channels of the same transceiver are used to discuss the design scheme of the link structure of the transceiver, the local oscillator module and the specific implementation mode of the main indexes. According to the requirements of link spurious, the technical specifications of customized dielectric filter are presented. Thirdly, the RF front end is designed in detail under the overall design requirements. According to the requirements of performance, the appropriate devices are selected, and the parameters such as gain, linearity and spurious suppression of the transceiver link are analyzed. The main functions of correction link transceiver switching, local oscillator and gain control are designed, and the key devices such as LNA and final stage power amplifier are optimized. Finally, the assembly and debugging of RF front-end are completed, and the main functions and performance are tested. The test results show that the RF front-end has the functions of 665 MHz broadband signal transceiver, channel selection and channel correction. The received noise coefficient is 4.1 dB, the transmission saturation power is 29 dBm, and the mirror image suppression is 70 dBc. The RF front-end platform covers the full frequency band of 802.11ac and adopts 8 脳 8 MIMO architecture to support flexible channel configuration and spatial stream configuration. It provides RF front-end hardware support for the verification of the next generation WLAN technology, and plays a certain role in promoting the development of 802.11ac technology.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN925.93
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本文编号：2014355