论文部分内容阅读
据日本邮政省称:从1996年冬季起与国内外通信厂家合作,着手开发下一代移动通信系统。这种系统与以往的便携式电话系统不同,即使在自己国家购买的终端也能在世界任何地方使用,不仅有声音,而且还能够交换图像信息。参加这项研究的不仅有日本的厂家,美国、瑞典、加拿大等欧美的主要通信厂家也将参加。 邮政省计划,与日前的便携式电话(5.6 kbit/s)相比,将大幅度提高传送容量,使其达到2 Mbit的水平。传送方式将采用宽频带码分多址(CDMA)方式,这种方式不仅电波的
According to Japan’s Ministry of Post and Communications said: Since the winter of 1996 with domestic and foreign communications manufacturers to start developing the next generation of mobile communications systems. Unlike conventional cellular phone systems, this system can be used anywhere in the world, even in the terminals it purchases in its own country, not only in sound but also in the exchange of image information. Participate in this study not only Japanese manufacturers, the United States, Sweden, Canada and other major telecommunications manufacturers in Europe and America will also participate. The Ministry of Posts and Telecommunications plans to significantly increase the transmission capacity to 2 Mbit compared to the previous cellular phones (5.6 kbit / s). Transmission method will use wideband code division multiple access (CDMA), this way not only radio waves