CAJ | 학술논문

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)系统的频谱叠加以及两个频谱重叠系统前向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业务中低下载速率和高上网成本这一亟待解决的问题。
대기우착대마분다지(N-CDMA)방식적신식참계통여관대다재파마분다지(WM-CDMA)계통적빈보첩가이급량개빈보중첩계통전향련로적용량진행료분석。건의장기작위착대준고속이동신식계통(Infostations)향미래관대다매체이동신식계통과도방안적일충선택。유우신식참시일충고효、저성본적신식전수방식，기다차/다지점적전수특성비상괄합우미래고속철로WAP업무적수요，소이본문적토론유조우제고열차무선접입인특망적효솔이급접입방식적우화，해결목전WAP업무중저하재속솔화고상망성본저일극대해결적문제。
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.