-
公开(公告)号:US20040114547A1
公开(公告)日:2004-06-17
申请号:US10675945
申请日:2003-10-02
申请人: Inmarsat, Ltd.
发明人: Louis Mimis Christodoulides , Howard Ray Feldman , Eyal Trachtman , Siu Wah Wong , Hok Shuen Wong
IPC分类号: H04B007/185
CPC分类号: H04L29/06 , H04B7/18513 , H04B7/18532 , H04L1/0042 , H04L1/0066 , H04L1/0072 , H04L1/0078 , H04L1/0083 , H04L27/3466 , H04L69/324 , H04W4/18 , H04W28/22 , H04W48/08 , H04W72/00 , H04W84/06
摘要: A set of formats and protocols is proposed for a satellite communications system. In these formats, a pilot signal (PS) is inserted after every 25 or 29 data symbols. The formats consist of SCPC frames (F) which may contain either data (D) and in-band signalling information (SU), or only signalling information (SU). In either case, the contents of each frame (F) are error-correction coded before transmission with the same coding rate. Each data frame (F) carries the data content of an integral number of input user data frames (M), each of which comprises four subframes. Different symbol transmission rates are used for different input data rates, the symbol transmission rates being selected so that their different synchronising clock rates can easily be obtained from a common clock. Data bursts may be preceded by a constant power level preamble (P). The formats and protocols satisfy the requirements of a high data rate satellite communications system.
摘要翻译: 为卫星通信系统提出了一套格式和协议。 在这些格式中,每25或29个数据符号插入导频信号(PS)。 这些格式包括可以包含数据(D)和带内信令信息(SU)的SCPC帧(F),或只包含信令信息(SU)。 在这两种情况下,每帧(F)的内容在具有相同编码率的传输之前进行纠错编码。 每个数据帧(F)携带整数个输入用户数据帧(M)的数据内容,每个数据帧包括四个子帧。 对于不同的输入数据速率使用不同的符号传输速率,选择符号传输速率使得它们可以容易地从公共时钟获得不同的同步时钟速率。 数据脉冲串之前可以有恒定的功率电平前导码(P)。 格式和协议满足高数据速率卫星通信系统的要求。