基于MB-OFDM UWB的短距离无线多媒体传输

Short-range Wireless Multimedia Transmission with Ultra-wideband Based MB-OFDM Technology

超宽带(UWB)是实现高速无线个域网(WPAN)多媒体传输的关键技术。UWB以超短周期脉冲进行调制,并使用超宽的RF频谱带宽传递数据,可通过重叠的原则共享已占用的频谱资源;其具有频谱利用率高、抗多径衰落能力强、发送功率极小、系统安全性好等特点。UWB可为消费类电子设备提供高速无线连接解决方案,使视频连接和桌面应用等能在通用射频平台上运行。因此,研究UWB的标准化、产品化与市场化进程,剖析其主流技术,对于制订我国相关标准,促进UWB技术与系统产品在中国的发展和实施,具有积极的现实意义。为使UWB主流技术能被进一步了解,在跟踪研究UWB标准化的基础上,分析了作为国际上第1个商用UWB标准的多频带正交频分复用(MB-OFDM)方案的原理与技术特征,并阐述了基于该方案的无线多媒体超宽带(WiMedia UWB)平台与应用环境、产品整合进展及应用前景。

Uhra-Wideband（UWB） is a radio technology to accomplish multi-media transmitting for HR-WPAN （high-rate wireless personal area network）. Being modulated by a group of sharp pulse, UWB sends data through an ultra wide RF and shares in the spectrum with overlapping. UWB possesses excellent characteristics： high spectrum utilization ratio, ambition performance of anti multi-path attenuation, very low emission power and good system security. UWB provides the high-rate wireless connect scheme for consuming electronic devices, make the video connection and desktop application executing on common RF platform. Studying the development of UWB has realistic meaning that includes standardization, products, market and leading trend＇ s technology. The paper provides an overview on UWB specifications, analyses the principle of MB-OFDM （multi-band orthogonal frequency division multiplexing） technology, and introduces the RF platform and its applications based on WiMedia UWB.