发明授权
- 专利标题: Methods and apparatus for broadcasting regional information over a satellite communication system
- 专利标题(中): 通过卫星通信系统广播区域信息的方法和装置
-
申请号: US09650513申请日: 2000-08-29
-
公开(公告)号: US06594469B1公开(公告)日: 2003-07-15
- 发明人: John Serri , Michael J. Sites , Vijaya Gallagher
- 申请人: John Serri , Michael J. Sites , Vijaya Gallagher
- 主分类号: H04Q720
- IPC分类号: H04Q720
摘要:
In a communication satellite constellation which uses CDMA and multiple spot beams for point-to-point communication, a system is provided for broadcasting regionally related information within a spot beam by establishing a Frequency/Walsh Code Tiling over the Earth's surface, and enabling a user terminal at a given position to tune to an appropriate frequency and Walsh Code to receive the information broadcast from a satellite over a forward beam downlink. The information, e.g. regional messages such as local weather or traffic, is transmitted to the satellite from a ground station or gateway that receives the information from a Broadcast Processing Center. In a preferred embodiment a dedicated Frequency Division Multiplex (FDM) channel within each spot beam transmits the regional broadcast messages at the Tiles in accordance with the Walsh Code designations of the Tiles.