信息站与WM—CDMA系统的频谱叠加

对基于窄带码分多址（N-CDMA）方式的信息站系统与宽带多载波码分多址（WM-CDMA）系统的频谱重叠系统前后链路的容量进行了分析。建议将其作为窄带准高速移动信息系统（Infostations)向未来宽带多媒体移动信息系统过渡方案的一种选择，由于信息站是一种高效，低成本的信息传输方式，其多次/多地点的传输特性非常适合于未来高速铁路WAP业务的需要，所以本文的讨论有助于提高列车无线接入因特网的效率以及接入方式的优化，解决目前WAP业务中低于载速率和高上网成本这一亟待解决的问题。

Spectral overlay of Infostations on WM-CDMA cellular system

In this paper, we studied the spectral overlay of Infostations based on N-CDMA and WM-CDMA systems and analyzed the achievable capacity of I/WM-CDMA system in downlink. The scheme of overlay can be considered as a means of evolution from narrowband, quasihigh speed mobile information system, which we call “Infostations”, into a wide -band and high speed multimedia mobile information system based. Because the Infostations is a high-efficient,low-cost information transmission pattern, and its “manytime, many-where” communication paradigm is very suitable for WAP service.The study here is helpful for enhancing the efficiency of wireless access Internet，in order to resolve the problem of low download rate and high cost of access in WAP service.