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公开(公告)号:US07266097B2
公开(公告)日:2007-09-04
申请号:US10675945
申请日:2003-10-02
申请人: Louis Mimis Christodoulides , Howard Ray Feldman , Eyal Trachtman , Siu Wah Wong , Hok Shuen Wong
发明人: Louis Mimis Christodoulides , Howard Ray Feldman , Eyal Trachtman , Siu Wah Wong , Hok Shuen Wong
IPC分类号: H04B7/185
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 signaling information (SU), or only signaling 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 synchronizing 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。
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公开(公告)号:US06665361B1
公开(公告)日:2003-12-16
申请号:US09262064
申请日:1999-03-04
申请人: Louis Mimis Christodoulides , Howard Ray Feldman , Eyal Trachtman , Siu Wah Wong , Hok Shuen Wong
发明人: Louis Mimis Christodoulides , Howard Ray Feldman , Eyal Trachtman , Siu Wah Wong , Hok Shuen Wong
IPC分类号: H04L706
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 synchronizing 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。
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公开(公告)号:US07043196B1
公开(公告)日:2006-05-09
申请号:US08904312
申请日:1997-07-31
IPC分类号: H04B7/185
CPC分类号: H04L1/1685 , H04B7/18523 , H04B7/18582 , H04L1/1809 , H04L1/187 , H04L1/1887 , H04L2001/0093
摘要: Data relating to the status of users 12 in a mobile communications system is broadcast via satellite 8 from a network register 4 to local registers 10 in an HDLC format. Each of the local registers 10 requests retransmission of any HDLC frames which are incorrectly received. The network register 4 records the earliest transmitted frame not yet acknowledged by all of the local registers and inhibits transmission of new frames if they fall outside a transmission window relative to the earliest transmitted frame. The network register 4 polls the local registers 10 for retransmission requests and the local registers 10 also send unsolicited requests to the network register 4. The network register 4 only retransmits a frame once if multiple requests for that frame are transmitted within a predetermined period. When a new local register 10 enters the broadcast reception group, the network register 4 informs the new local register 10 which new frame will next be transmitted. The number of bits used for frame sequence numbers is greater than that defined in the HDLC protocols.
摘要翻译: 与移动通信系统中的用户12的状态有关的数据通过卫星8从网络寄存器4以HDLC格式广播到本地寄存器10。 每个本地寄存器10请求重新发送未正确接收的任何HDLC帧。 网络寄存器4记录所有本地寄存器尚未确认的最早发送帧,如果它们相对于最早发送的帧落在传输窗口之外,则禁止发送新帧。 网络寄存器4轮询本地寄存器10以进行重传请求,并且本地寄存器10还向网络寄存器4发送未经请求的请求。 网络寄存器4仅在预定时段内发送对该帧的多个请求时才重新发送帧1次。 当新的本地寄存器10进入广播接收组时,网络寄存器4通知新的本地寄存器10接下来将发送哪个新的帧。 用于帧序列号的位数大于HDLC协议中定义的位数。
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