软件无线电在电离层电波探测中的应用

提出了应用软件无线电发展新的电离层电波探测技术,开发新一代电离层电波探测设备的思想,并针对广泛使用的电离层探测设备数字测高仪,详细讨论了软件化数字测高仪的系统结构、特色和可行性。结果表明：发展新的软件化电离层电波探测设备的理论和技术条件均已成熟,它所具有的开放性和灵活性,能更好的满足二十一世纪电离层空间大气研究的需要。     

Efficient FPGA implementation of a STBC-OFDM combiner for an IEEE 802.16 software radio receiver

In this paper, an efficient FPGA implementation of a 4×4 Space-Time Block Coding (STBC) combiner for MIMO-OFDM software radio receivers is considered. The proposed combiner is based on a low-complexity algorithm which reduces the interference due to the Quasi-Orthogonality of the STBC decoding. In the literature, feedback techniques have been proposed to solve this problem. However, the algorithm introduced in this paper has been conceived in order to avoid the transmission feedback, by estimating the interference factors and removing them. The proposed algorithm exhibits a low computational complexity and complies with the requirements of HW feasibility, considering the execution time/area occupation trade-off.     

Engineering the embedded software radio

Software-defined radios allow flexible implementation of different basebands in digital signal processors. For communications transceivers this introduces an engineering problem: how to manage the different protocol stacks that may be required to work above the baseband software. To solve this, we propose a consistent software architectural framework for the dynamic implementation of these different protocols within an embedded environment. We discuss its requirements and present one possible approach based on STREAMS     

Advances in software defined radio

Progress in software defined radio has been rapid, since the term was first coined in the mid 1990s. In this brief overview we summarise some of the recent advances in software defined radio from a range of technology perspectives — radio frequency design, baseband reconfigurability, reconfigurable applications and protocols and regulatory (and related network) aspects. Our frame of reference for this article is commercial mobile telecommunications, although many of the technology advances are of relevance and application in other arenas, such as defence, satellite communications and broadcasting. Software defined radio has come a long way very quickly, but in reality is still in its infancy — the next decade will see substantially further advances. This paper draws heavily upon two books on this subject recently edited by the author — the contributors to those books are listed at the end of this article and the work of these pioneers of software radio is fully and most gratefully acknowledged. Additional detail on issues covered in this article may be found in specific chapters of these books, referenced as [Name] within the text.     

The software radio concept

Since early 1980 an exponential blowup of cellular mobile systems has been observed, which has produced, all over the world, the definition of a plethora of analog and digital standards. In 2000 the industrial competition between Asia, Europe, and America promises a very difficult path toward the definition of a unique standard for future mobile systems, although market analyses underline the trading benefits of a common worldwide standard. It is therefore in this field that the software radio concept is emerging as a potential pragmatic solution: a software implementation of the user terminal able to dynamically adapt to the radio environment in which it is, time by time, located. In fact, the term software radio stands for radio functionalities defined by software, meaning the possibility to define by software the typical functionality of a radio interface, usually implemented in TX and RX equipment by dedicated hardware. The presence of the software defining the radio interface necessarily implies the use of DSPs to replace dedicated hardware, to execute, in real time, the necessary software. In this article objectives, advantages, problem areas, and technological challenges of software radio are addressed. In particular, SW radio transceiver architecture, possible SW implementation, and its download are analyzed     

The software radio architecture

As communications technology continues its rapid transition from analog to digital, more functions of contemporary radio systems are implemented in software, leading toward the software radio. This article provides a tutorial review of software radio architectures and technology, highlighting benefits, pitfalls, and lessons learned. This includes a closer look at the canonical functional partitioning of channel coding into antenna, RF, IF, baseband, and bitstream segments. A more detailed look at the estimation of demand for critical resources is key. This leads to a discussion of affordable hardware configurations, the mapping of functions to component hardware, and related software tools. This article then concludes with a brief treatment of the economics and likely future directions of software radio technology     

Speakeasy: the military software radio

The Speakeasy Phase II radio will use programmable processing to emulate more than 15 existing military radios. Speakeasy is a challenge, even with recent advancements in DSP technologies. The benefits, however, make the challenge highly worthwhile     

软件无线电中的MATLAB仿真应用

随着第四代、第五代移动通信的发展，软件无线电已经成为制约现代通信发展的关键性技术。如何解决软件无线电中存在的突出问题已成为当前社会各界广泛关注的焦点。在解决这些问题的时候，我们通常应用MATLAB仿真软件进行模拟仿真。本文着重介绍如何应用MATLAB来完成数字调制过程的仿真，并对MSK，GMSK这两种常用的调制方式进行了仿真分析。     

Technical challenges in the globalization of software radio

The software radio has emerged from the third-generation strategy for affordable, ubiquitous, global communications. This article reviews the concepts, architecture, technology challenges, and economics of the continuing productization and globalization of software radio     

软件无线电技术简介

1软件无线电的概念 1992年5月在美国通信系统会议上,Joe Mitola首次提出了“软件无线电”（Software Radio）的概念。软件无线电是一种实现无线通信的新的体系结构。它的基本概念是把硬件作为无线通信的基本平台,把尽可能多的无线通信及个人通信功能用软件实现。这样无线通信新系统、新产品的开发将逐步转到软件上来．而无线通信产品的价值将越来越多地体现在软件上．打破了传统通信功能的实现仅仅依赖于硬件发展的格局。     

Emerging technologies for software radio

Multimode, multiband transceivers were once seen as a desirable but unachievable goal, particularly when considering small, battery-powered terminals. There are, however, significant market-pulls requiring just such a device and dual-mode systems (albeit with largely separate hardware) are now a reality. The next revolution will be the production of so-called flexible architecture terminals, in which the same hardware is used for all modulation formats and bands, with the internal software determining the mode to be utilised. Considerable research is being directed toward this goal worldwide, and practical results are beginning to appear which indicate that the unachievable may soon become a reality     

一种软件无线电平台的设计及应用

引言 随着无线通信的发展,出现了多种模式的通信体制,为了满足互通性的问题,软件无线电的思想被提出来.所谓软件无线电,其中心思想是:构造一个具有开放性、标准化、模块化的通用硬件平台,将通信的各种功能通过软件来完成,并使宽带A/D和D/A转换器尽可能靠近天线,以研制出具有高度灵活性、开放性的新一代无线通信系统.     

软件无线电技术探讨

1概述 随着通信技术的迅猛发展,新的通信体制与标准不断推出,不同体制间互通要求日趋强烈,并且随着通信业务的不断增长,无线频谱变得越来越挤,这对现有通信系统的频带利用率及抗干扰能力提出了更高的要求.但沿着现有通信体制的发展方向,很难对频带重新规划.同时,若采用新的抗干扰方法,也要求对现有通信系统的结构作出很大调整,代价很大.软件无线电就是在这种情况下产生的.其基本思想是以硬件作为其通用的基本平台,把尽可能多的无线及个人通信的功能用软件来实现,从而将无线通信新系统、新产品的开发逐步转移到软件上来,其产值也在软件上体现出来.软件无线电技术的最终目的是使通信系统摆脱硬件布线结构的束缚,在系统结构相对稳定的情况下,通过软件来实现各种功能,使得系统的改进和升级都非常方便,且代价小,同时不同系统间很容易实现互连与兼容.     

Mobile middleware for the reconfigurable software radio

The maturing technologies and concepts for software radio mean that reconfigurability is fast becoming reality. The functions and RF configuration of the mobile terminal, the services it supports, and the applications accessible to it can all be selected, installed, and executed on demand. Mobile middleware provides the glue that matches the requirements of the applications and their users to the capabilities of the terminals and networks. The state of the art in distributed processing systems built on an Internet platform must be integrated with advanced telecommunications functions of the intelligent network and UMTS to provide the environment in which this middleware operates. We explore the issues of integration, the components of mobile middleware, and likely demands placed on such systems when mobile access comes to dominate personal communications     

AD6645型模/数转换器在软件无线电中的应用

AD6645是Analog Devices公司推出的新型高速、高性能14位A/D转换器.文中介绍AD6645的工作原理、特点及其在接收系统中的实际应用电路.     

软件无线电中的信道化技术研究

软件无线电通信利用多频段和多模式的无线通信进行互连互通,具有极大的灵活性和适应性。文章围绕无线电接收机的信道化技术、带通采样理论等展开论述,利用CIC,HBF和FIR级联设计下变频抽取系统的实际方案作为论据,对基于软件无线电技术的信道化技术等展开论述,探讨软件无线电多速率信号等处理技术要点。     

移动通信系统软件无线电研究进展

本文描述了近年来用于移动通信系统的软件无线电研究的进展。文中还介绍了软件无线电论坛确定的五层解决方案。作者建议我国信息产业界和国家管理当局注视这一领域的发展前景,不失时机地推进我国的这一产业。     

软件无线电技术综述

软件无线电是最近几年提出的一种实现无线电通信的体系结构,是继模拟到数字,固定到移动之后,无线通信领域的又一次重大突破。并从软件无线电的基本概念出发,讨论了其功能结构,关键技术和难点以及应用和发展前景。     

Sample rate conversion for software radio

Software radio terminals must be able to process many various communications standards. These standards are generally based on different master clock rates and thus employ different bit/chip rates. The most obvious solution to cope with the diversity of master clock rates in one terminal is to provide a dedicated master clock for each standard of operation. Not only too costly, this kind of solution limits the applicability of a realized terminal. Hence, it is much more elegant to run the terminal on a fixed clock rate, and perform digital sample rate conversion controlled by software