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1.发明公开IMPROVED SYNCHRONIZATION OF A RECEIVER WITH A TRANSMITTER USING NONLINEAR TRANSFORMATION METRICS 失效改进的同步接收机与非线性变换度量的发射机使用
公开(公告)号：EP0931390A2
公开(公告)日：1999-07-28
申请号：EP97911631.0
申请日：1997-10-07
申请人： ERICSSON INC.
CPC分类号： H04L7/042 , H04B7/2125 , H04L7/06
摘要： A synchronization method and apparatus for synchronizing a receiver, such as a radiotelephone operable in a cellular communication system with a transmitter. Synchronization signals are transmitted as parts of a control signal to the receiver. Such synchronization signals are of high margins and also permit synchronization of the radiotelephone responsive to a reduced number of calculations. The time for such synchronization is reduced by use of nonlinear transformation metrics, such as logarithmic metrics, which reduce the impact of a noise or error component within the control signal.
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2.发明公开SPREAD SPECTRUM RANDOM ACCESS SYSTEMS AND METHODS FOR TIME DIVISION MULTIPLE ACCESS RADIOTELEPHONE COMMUNICATIONS SYSTEMS 失效方法和系统与频带扩展与多址无线电话信息传输系统IN TIME区域的多个ACCESS
公开(公告)号：EP0893013A2
公开(公告)日：1999-01-27
申请号：EP97921098.0
申请日：1997-04-03
申请人： ERICSSON INC.
摘要： In a time division multiple access (TDMA) radiotelephone communications system, a spread spectrum random access channel signal representing a random access message is communicated from a radiotelephone to a central station according to a spreading sequence. In response, a TDMA radiotelephone communications channel is assigned to the radiotelephone. A time division multiplexed radiotelephone communications signal is communicated between the radiotelephone and the central station on the assigned TDMA radiotelephone communications channel over a time division multiplexed carrier frequency band. Preferably, in communicating the spread spectrum random access channel signal, a random access channel signal, representing the random access channel message, is direct sequence modulated according to the spreading sequence to produce a direct sequence modulated random access channel signal. According to a two-stage detection aspect, a synchronization sequence may be associated with a plurality of spreading sequences. The synchronization sequence may be first detected from the communicated spread spectrum random access channel signal, and in response to detection of the synchronization sequence, one of the plurality of spreading sequences associated with the detected synchronization sequence may be detected. A station identification may be assigned to the radiotelephone, with the station identification preferably represented by a digital station identification word. The synchronization sequence and the spreading sequence may be identified from the station identification word, thus associating the synchronization and spreading sequences. The spreading sequence may also be randomly generated from the station identification word.
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3.发明公开CIRCUITRY AND METHOD FOR IMPROVED SIGNAL RECEPTION ACKNOWLEDGMENT IN A RADIO COMMUNICATION SYSTEM 失效电路及方法改进收据信号接收时，在无线传输系统
公开(公告)号：EP0945040A2
公开(公告)日：1999-09-29
申请号：EP97950884.0
申请日：1997-12-09
申请人： ERICSSON INC.
CPC分类号： H04W68/02 , H04B7/18532 , H04L1/0009 , H04L1/1692 , H04L1/1867
摘要： A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. Upon reception, the acknowledgment signal is correlated using a multiplicity of correlators. An increased margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.
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4.发明公开IMPROVED SYNCHRONIZATION OF A RECEIVER WITH A TRANSMITTER USING EARLY-LATE TESTING DURING COARSE SYNCHRONIZATION 失效改进的同步接收机之严重在同步过程中Frue与正在测试的发射器中使用
公开(公告)号：EP0931391A2
公开(公告)日：1999-07-28
申请号：EP97945199.0
申请日：1997-10-07
申请人： ERICSSON INC.
发明人： WANG, Eric, Yi-Pin
CPC分类号： H04W56/001 , H04L7/007 , H04L7/06
摘要： A synchronization method and apparatus for synchronizing a receiver, such as a radiotelephone (24) operable in a cellular communication system (10) with a transmitter. A synchronization signal is transmitted within a multiframe (MF) of a control signal to the receiver, which upon powering up detects an undifferentiated digital bit stream and divides the bits into a succession of discrete portions or bins (b). Energy accumulations within each such portion are calculated, and a space-profile metric (M) of those portions falling within a synchronization burst pattern computed. Space-profile metrics of adjacent portions are also computed. Taking the differences between a given portion and portions prior to and after the given portion, a difference metric (D) is utilized to better predict the occurrence of a multiframe boundary, facilitating synchronization, despite the presence of other high-power bursts within the transmission.
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5.发明授权IMPROVED SYNCHRONIZATION OF A RECEIVER WITH A TRANSMITTER USING NONLINEAR TRANSFORMATION METRICS 失效改进的同步接收机与非线性变换度量的发射机使用
公开(公告)号：EP0931390B1
公开(公告)日：2001-12-19
申请号：EP97911631.6
申请日：1997-10-07
申请人： ERICSSON INC.
CPC分类号： H04L7/042 , H04B7/2125 , H04L7/06
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6.发明公开SYSTEMS AND METHODS FOR RANDOM ACCESS IN TIME DIVISION MULTIPLE ACCESS SATELLITE RADIOTELEPHONE COMMUNICATIONS 失效DEVICE AND METHOD FOR随机访问以卫星为基础的TDMA无线电话通讯，
公开(公告)号：EP0893012A2
公开(公告)日：1999-01-27
申请号：EP97920120.0
申请日：1997-04-03
申请人： ERICSSON INC.
发明人： HASSAN, Amer , RAMESH, Rajaram , REINHOLD, Stanley, L. , MASSENGILL, Larry, W. , WANG, Eric, Yi-Pin
CPC分类号： H04B7/212 , H04W74/0866
摘要： In a time division mutiple access (TDMA) satellite radiotelephone communications system, a radiotelephone communicates random access channel radiotelephone communications signals to a satellite over a dedicated random access channel uplink carrier frequency band. In response, a time division mutiple access channel on a time division multiplexed uplink carrier frequency band different from the dedicated random access channel uplink carrier frequency band is assigned. The radiotelephone communicates time division multiplexed radiotelephone communications signals to the satellite over the allocated time division multiple access channel. Random access channel radiotelephone communications signals may be communicated to the satellite from a first radiotelephone over a first dedicated random access channel uplink carrier frequency band or from a second radiotelephone over a second dedicated random access channel uplink carrier frequency band different from said first dedicated random access channel uplink carrier frequency band. For a system in which the satellite communicates radiotelephone communications signals to radiotelephones located in a first coverage area and communicates radiotelephone communications signals to radiotelephones located in a second coverage area, random access channel radiotelephone communications signals may be communicated over a first dedicated random access uplink carrier frequency band if the radiotelephone is located in the first coverage area or communicating random access radiotelephone communications signals over a second dedicated random access channel uplimk carrier frequency band different from the first dedicated random access uplink carrier band if the radiotelephone is located in the second coverage area.
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7.发明授权SPREAD SPECTRUM RANDOM ACCESS SYSTEMS AND METHODS FOR TIME DIVISION MULTIPLE ACCESS RADIOTELEPHONE COMMUNICATIONS SYSTEMS 失效方法和系统与频带扩展与多址无线电话信息传输系统IN TIME区域的多个ACCESS
公开(公告)号：EP0893013B1
公开(公告)日：2003-11-26
申请号：EP97921098.6
申请日：1997-04-03
申请人： ERICSSON INC.
摘要： In a time division multiple access (TDMA) radiotelephone communications system, a spread spectrum random access channel signal representing a random access message is communicated from a radiotelephone to a central station according to a spreading sequence. In response, a TDMA radiotelephone communications channel is assigned to the radiotelephone. A time division multiplexed radiotelephone communications signal is communicated between the radiotelephone and the central station on the assigned TDMA radiotelephone communications channel over a time division multiplexed carrier frequency band. Preferably, in communicating the spread spectrum random access channel signal, a random access channel signal, representing the random access channel message, is direct sequence modulated according to the spreading sequence to produce a direct sequence modulated random access channel signal. According to a two-stage detection aspect, a synchronization sequence may be associated with a plurality of spreading sequences. The synchronization sequence may be first detected from the communicated spread spectrum random access channel signal, and in response to detection of the synchronization sequence, one of the plurality of spreading sequences associated with the detected synchronization sequence may be detected. A station identification may be assigned to the radiotelephone, with the station identification preferably represented by a digital station identification word. The synchronization sequence and the spreading sequence may be identified from the station identification word, thus associating the synchronization and spreading sequences. The spreading sequence may also be randomly generated from the station identification word.
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8.发明授权SYSTEMS AND METHODS FOR RANDOM ACCESS IN TIME DIVISION MULTIPLE ACCESS SATELLITE RADIOTELEPHONE COMMUNICATIONS 失效DEVICE AND METHOD FOR随机访问以卫星为基础的TDMA无线电话通讯，
公开(公告)号：EP0893012B1
公开(公告)日：2001-09-05
申请号：EP97920120.9
申请日：1997-04-03
申请人： ERICSSON INC.
发明人： HASSAN, Amer , RAMESH, Rajaram , REINHOLD, Stanley, L. , MASSENGILL, Larry, W. , WANG, Eric, Yi-Pin
IPC分类号： H04B7/212
CPC分类号： H04B7/212 , H04W74/0866
摘要： In a time division mutiple access (TDMA) satellite radiotelephone communications system, a radiotelephone communicates random access channel radiotelephone communications signals to a satellite over a dedicated random access channel uplink carrier frequency band. In response, a time division mutiple access channel on a time division multiplexed uplink carrier frequency band different from the dedicated random access channel uplink carrier frequency band is assigned. The radiotelephone communicates time division multiplexed radiotelephone communications signals to the satellite over the allocated time division multiple access channel. Random access channel radiotelephone communications signals may be communicated to the satellite from a first radiotelephone over a first dedicated random access channel uplink carrier frequency band or from a second radiotelephone over a second dedicated random access channel uplink carrier frequency band different from said first dedicated random access channel uplink carrier frequency band. For a system in which the satellite communicates radiotelephone communications signals to radiotelephones located in a first coverage area and communicates radiotelephone communications signals to radiotelephones located in a second coverage area, random access channel radiotelephone communications signals may be communicated over a first dedicated random access uplink carrier frequency band if the radiotelephone is located in the first coverage area or communicating random access radiotelephone communications signals over a second dedicated random access channel uplimk carrier frequency band different from the first dedicated random access uplink carrier band if the radiotelephone is located in the second coverage area.
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9.发明授权IMPROVED SYNCHRONIZATION OF A RECEIVER WITH A TRANSMITTER USING EARLY-LATE TESTING DURING COARSE SYNCHRONIZATION 失效改进的同步接收机之严重在同步过程中Frue与正在测试的发射器中使用
公开(公告)号：EP0931391B1
公开(公告)日：2000-12-13
申请号：EP97945199.4
申请日：1997-10-07
申请人： ERICSSON INC.
发明人： WANG, Eric, Yi-Pin
CPC分类号： H04W56/001 , H04L7/007 , H04L7/06
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