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软件无线电(Software Radio)是通信系统中极具发展前途的技术。随着高速数字信号处理器的发展以及大规模可编程门阵(FPGA)的普及,软件无线电把诸多与具体信号类型紧密相关的处理任务软件化,从而使通信中的硬件设备更为通用。但是待传输的数据或已被接收的数据都需要通过局域网或其他类型的骨干网络与数据中心交换数据。多协议传输平台(MSTP)是一种融合数据业务与实时业务在SDH网络中传输的规范,是目前流行宽带数据接入形式,它为软件无线电提供了多种灵活的接入形式。作为MSTP,其关键技术之一是虚级联。与传统的连续级联相比,虚级联减小了带宽分配的颗粒度,使SDH传输管理更为灵活,提高了整体网络的资源利用率。本文介绍我们在MSTP芯片中VC-12虚级联模块的设计和理论分析过程。经过软件仿真和FPGA验证,这部分电路设计正确合理,可以稳定工作在预定工作速率。应用该设计的MSTP芯片目前已经完成加工,并被成功应用于MSTP网络设备中。相信我们的工作对软件无线电技术的未来发展有着积极的作用。
Software Radio is a promising technology in communications systems. With the development of high-speed digital signal processors and the popularization of large-scale programmable gate arrays (FPGAs), software radios softwareize many processing tasks closely related to specific signal types to make the hardware devices in communication more universal. However, data to be transmitted or received has to be exchanged with the data center over a local area network or other type of backbone network. Multi-Protocol Transport Platform (MSTP) is a specification for data services and real-time services in SDH networks. It is the popular form of broadband data access and provides a variety of flexible forms of access for software radios. As MSTP, one of the key technologies is Virtual Concatenation. Compared with the traditional continuous concatenation, Virtual concatenation reduces the granularity of bandwidth allocation, makes the SDH transmission management more flexible and improves the overall network resource utilization. This article describes our MSTP chip VC-12 virtual concatenation module design and theoretical analysis process. After software simulation and FPGA verification, this part of the circuit design is correct and reasonable, you can work at a predetermined rate of stability. The MSTP chip that uses this design has already finished processing at present, and has been successfully applied to MSTP network equipment. We believe our work will play a positive role in the future development of software radio technology.