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1. 发明授权

US5838267A Method and apparatus for encoding and decoding digital information 失效
标题翻译：用于对数字信息进行编码和解码的方法和装置
公开(公告)号：US5838267A
公开(公告)日：1998-11-17
申请号：US728158
申请日：1996-10-09
申请人： Yi-Pin Eric Wang , Sandeep Chennakeshu , Paul W. Dent , Kumar Balachandran
发明人： Yi-Pin Eric Wang , Sandeep Chennakeshu , Paul W. Dent , Kumar Balachandran
IPC分类号： H03M13/37 , G06F11/10 , H03M13/00 , H03M13/29 , H04L1/00 , H04L1/06 , H04L1/18 , G06F11/00
CPC分类号： H04L1/0057 , H03M13/00 , H03M13/2927 , H03M13/293 , H03M13/2942 , H03M13/3769 , H04L1/06 , H03M13/1505 , H03M13/6306 , H04L1/0071
摘要： A method for encoding and decoding the digital information sequence uses a combination of two block codes to simultaneously correct and detect errors. The information sequence is encoded by a first stage of the encoder to produce an information code word including an information vector and a primary redundancy vector. The primary redundancy vector is encoded in a second stage of the encoder to obtain a redundancy code word. The information code word and redundancy code word are interleaved and transmitted to the receiver. At the receiver, the information code word and redundancy code word are decoded in a first stage of the decoder to obtain a first estimate of the information code word. The first estimate of the information code word is decoded in the second stage of the decoder to produce a second estimate of the information code word. The distance between the first and second estimates of the information code word is evaluated. If the distance is more than one, the received code word is erased. In another embodiment, the information sequence is repeated at the receiver. Each repetition includes a parity check resulting from the same code or from different codes. The received information vectors are selectively combined and then individually decoded using the individual parity vectors to generate multiple estimates of the information sequence. The estimates are then combined using hard or soft combining techniques.
摘要翻译：用于对数字信息序列进行编码和解码的方法使用两个块码的组合来同时校正和检测错误。信息序列由编码器的第一级编码，以产生包括信息向量和主冗余向量的信息码字。主冗余矢量被编码在编码器的第二级以获得冗余码字。信息码字和冗余码字被交织并发送到接收机。在接收机处，信息码字和冗余码字在解码器的第一级解码，以获得信息码字的第一估计。在解码器的第二级解码信息码字的第一估计，以产生信息码字的第二估计。评估信息码字的第一和第二估计之间的距离。如果距离大于1，则接收到的代码字被擦除。在另一个实施例中，在接收器处重复信息序列。每个重复都包括由相同代码或不同代码产生的奇偶校验。选择性地组合所接收的信息向量，然后使用各个奇偶校验向量单独解码以生成信息序列的多个估计。然后使用硬或软组合技术组合估计值。

2. 发明授权

US5918174A Circuitry and method for initiating communication between communication stations of a radio communication system 失效
标题翻译：用于发起无线电通信系统的通信站之间的通信的电路和方法
公开(公告)号：US5918174A
公开(公告)日：1999-06-29
申请号：US626182
申请日：1996-03-29
申请人： Sandeep Chennakeshu , Yi-Pin Eric Wang , Kumar Balachandran
发明人： Sandeep Chennakeshu , Yi-Pin Eric Wang , Kumar Balachandran
IPC分类号： H04B7/185 , H04W68/00 , H04W68/02 , H04W88/18
CPC分类号： H04B7/18558 , H04W68/00 , H04W68/02 , H04W88/185
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. 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.
摘要翻译：一种用于发起无线电通信系统（诸如卫星蜂窝通信系统）的网络站和用户终端之间的通信的方法和相关电路。当要发起通信时，网络站向用户终端发送寻呼信号。当用户终端检测到寻呼信号时，用户终端产生一个确认信号并进行编码以增加确认信号的余量。发送确认寻呼信号的接收的增加的裕度确认信号以促进确认信号的通信回到网络站。

3. 发明授权

US06415154B1 METHOD AND APPARATUS FOR COMMUNICATING AUXILLIARY INFORMATION AND LOCATION INFORMATION BETWEEN A CELLULAR TELEPHONE NETWORK AND A GLOBAL POSITIONING SYSTEM RECEIVER FOR REDUCING CODE SHIFT SEARCH TIME OF THE RECEIVER 有权
标题翻译：用于通信蜂窝电话网络和全球定位系统接收器之间的辅助信息和位置信息的方法和装置，用于减少代码移位接收器的搜索时间
公开(公告)号：US06415154B1
公开(公告)日：2002-07-02
申请号：US09167077
申请日：1998-10-06
申请人： Yi-Pin Eric Wang , Sandeep Chennakeshu
发明人： Yi-Pin Eric Wang , Sandeep Chennakeshu
IPC分类号： H04Q720
CPC分类号： G01S5/0036 , G01S19/25 , G01S19/37 , G01S2205/008
摘要： A method and apparatus for communicating auxiliary information between a cellular telephone network and a GPS receiver positioned within a mobile station and identifying the location of the mobile station. A dedicated channel between the mobile station and the network is assigned by the network and uplink timing between the mobile station and the network is adjusted. The network requests auxiliary information and also requests the GPS receiver to perform a GPS code shift search at a common reference time. Upon receiving the auxiliary information, the network transmits the auxiliary information to the GPS receiver which then performs the GPS code shift search. The GPS receiver incorporates a bank of correlators and accumulators to perform multiple parallel searches for various Doppler frequency shifts resulting from a moving GPS receiver. The mobile station subsequently transmits the location information to the cellular telephone network.
摘要翻译：一种用于在蜂窝电话网络和位于移动站内的GPS接收机之间传送辅助信息并识别移动台的位置的方法和装置。通过网络分配移动台与网络之间的专用信道，调整移动台与网络之间的上行定时。网络请求辅助信息，并请求GPS接收机在公共参考时间执行GPS码移动搜索。在接收到辅助信息时，网络将辅助信息发送到GPS接收机，然后执行GPS码移动搜索。 GPS接收机包含一组相关器和累加器，以对移动的GPS接收机产生的各种多普勒频移进行多次并行搜索。移动台随后将位置信息发送到蜂窝电话网络。

4. 发明授权

US6046990A High-penetration transmission method for a radiocommunication system 失效
标题翻译：用于无线电通信系统的高穿透传输方法
公开(公告)号：US6046990A
公开(公告)日：2000-04-04
申请号：US559692
申请日：1995-11-15
申请人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
发明人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
IPC分类号： H04B7/185 , H04L1/08 , H04W68/00 , H04W68/02 , H04W88/18 , H04B7/212
CPC分类号： H04L1/08 , H04B7/18567 , H04W68/00 , H04W68/02 , H04W88/185
摘要： A method and system for increasing the signal margin of a radiocommunication link to provide a short message service which is reliable, even under non-ideal conditions. According to the method, an increase in transmission power is used in combination with bit repetition to increase signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.
摘要翻译：一种用于增加无线电通信链路的信号余量以提供即使在非理想条件下也是可靠的短消息服务的方法和系统。根据该方法，与比特重复结合使用传输功率的增加以增加信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。

5. 发明授权

US6005887A Despreading of direct sequence spread spectrum communications signals 失效
标题翻译：直接序列扩频通信信号的解扩
公开(公告)号：US6005887A
公开(公告)日：1999-12-21
申请号：US748755
申请日：1996-11-14
申请人： Gregory E. Bottomley , Rajaram Ramesh , Paul W. Dent , Sandeep Chennakeshu
发明人： Gregory E. Bottomley , Rajaram Ramesh , Paul W. Dent , Sandeep Chennakeshu
IPC分类号： H04B7/26 , H04B1/707 , H04B1/709 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/709 , H04B1/707
摘要： The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.
摘要翻译：本公开提出了用于解扩直接序列扩频通信信号的许多降低的复杂度架构。在用于序列去除单元的第一解扩架构中，根据复扩展序列的处理相位，接收的码片间隔复数样本被否定。此外，同相和正交相位采样值根据处理相位彼此切换。在第二解扩架构中，在序列去除单元中，在对数域中处理接收的码片间隔复数样本，其中复扩展序列的相位被加到检测相位，并且所得到的复信号然后转换回笛卡尔坐标。在用于相关器的第三解扩架构中，在对数域中执行序列去除和相关，其中所得复数信号的幅度和相位被算术平均，然后转换回笛卡尔坐标。用于相关器的架构，使用循环平均在对数域中执行序列去除和相关。在用于相关器的第五解扩架构中，其中将多个分量序列组合在一起以形成整个序列，并且其中所述多个分量序列之一由所有信道共享，提供共同的序列去除以从所有频道然后将所得到的信号发送到多个单独的相关器，以去除信道特定序列。

6. 发明授权

US5822310A High power short message service using broadcast control channel 失效
标题翻译：使用广播控制信道的大功率短信业务
公开(公告)号：US5822310A
公开(公告)日：1998-10-13
申请号：US579015
申请日：1995-12-27
申请人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
发明人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
IPC分类号： H04B7/15 , H04B7/185 , H04J3/00 , H04L1/08 , H04Q7/22 , H04B7/204
CPC分类号： H04L1/08 , H04B7/18567
摘要： A method and system for increasing the signal margin of a radiocommunication link to provide a short message service which is reliable, even under non-ideal conditions. According to the method, short alphanumeric messages can be transmitted over the broadcast control channel of a digital radiocommunication link, or another communication channel consisting of one or more slots from successive frames in a TDMA communication link. An increase in transmission power is used in combination with repetition to increase effective signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.
摘要翻译：一种用于增加无线电通信链路的信号余量以提供即使在非理想条件下也是可靠的短消息服务的方法和系统。根据该方法，可以通过数字无线电通信链路的广播控制信道或由TDMA通信链路中的连续帧的一个或多个时隙组成的另一通信信道来传送短的字母数字消息。传输功率的增加与重复结合使用以增加有效信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。

7. 发明授权

US5809141A Method and apparatus for enabling mobile-to-mobile calls in a communication system 失效
标题翻译：用于在通信系统中实现移动电话到移动电话的方法和装置
公开(公告)号：US5809141A
公开(公告)日：1998-09-15
申请号：US681916
申请日：1996-07-30
申请人： Paul W. Dent , Sandeep Chennakeshu , Rajaram Ramesh , Stanley L. Reinhold
发明人： Paul W. Dent , Sandeep Chennakeshu , Rajaram Ramesh , Stanley L. Reinhold
IPC分类号： H04L9/08 , H04B7/15 , H04B7/185 , H04B7/26 , H04Q7/38 , H04K1/00
CPC分类号： H04B7/18532 , H04B7/18558 , H04B7/18565
摘要： A communication system is disclosed which reduces loop delay when a first wireless phone calls a second wireless phone wherein the first and second phones are served by the same relay station. The communication system includes a relay station for communicating with the first and second wireless phones. A transponder located in the relay station relays signals received from one mobile station on a first frequency band to another mobile station on a second frequency band. In addition, the transponder sends the received signals to a controller which controls the operation of the transponder using control information.
摘要翻译：公开了一种通信系统，其在第一无线电话呼叫第二无线电话时减少环路延迟，其中第一和第二电话由相同的中继站服务。通信系统包括用于与第一和第二无线电话进行通信的中继站。位于中继站的应答器将在第一频带上从一个移动台接收的信号中继到第二频带上的另一个移动台。此外，应答器将接收的信号发送到使用控制信息控制应答器的操作的控制器。

8. 发明授权

US06414945B1 High power short message service using TDMA frames and/or broadcast control channel 有权
标题翻译：使用TDMA帧和/或广播控制信道的大功率短消息业务
公开(公告)号：US06414945B1
公开(公告)日：2002-07-02
申请号：US09166793
申请日：1998-10-06
申请人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
发明人： Sandeep Chennakeshu , Nils Rydbeck , Amer A. Hassan , Paul W. Dent
IPC分类号： H04B7212
CPC分类号： H04W68/00 , H04B7/18567 , H04L1/08 , H04W4/14 , H04W28/06 , H04W52/06 , H04W52/48
摘要： A method and system for transmitting short data messages in a control station-based TDMA radiocommunication system. Selected TDMA frames are assigned as message frames, and one or more data slots from each message frame are assigned to transmitter/receivers. Data messages can be encoded and transmitted multiple times, at an increased power level, from a control station to a transmitter/receiver over the appropriate data slots in each message frame. The selected TDMA frames are preferably slow associated control channel frames. Also, short alphanumeric messages can be transmitted over the broadcast control channel of a digital radiocommunication link, or another communication channel consisting of one or more slots from successive frames in a TDMA communication link. An increase in transmission power is used in combination with repetition to increase effective signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.
摘要翻译：一种用于在基于控制站的TDMA无线电通信系统中发送短数据消息的方法和系统。所选TDMA帧被分配为消息帧，并且来自每个消息帧的一个或多个数据时隙被分配给发射机/接收机。在每个消息帧中的数据消息可以通过适当的数据时隙从控制站到发射机/接收机以增加的功率电平被多次编码和传输。选择的TDMA帧优选地是慢关联的控制信道帧。此外，可以通过数字无线电通信链路的广播控制信道或由TDMA通信链路中的连续帧的一个或多个时隙组成的另一个通信信道来传送短的字母数字消息。传输功率的增加与重复结合使用以增加有效信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。

9. 发明授权

US6137843A Methods and apparatus for canceling adjacent channel signals in digital communications systems 失效
标题翻译：用于消除数字通信系统中相邻信道信号的方法和装置
公开(公告)号：US6137843A
公开(公告)日：2000-10-24
申请号：US901693
申请日：1997-07-28
申请人： Sandeep Chennakeshu , Rajaram Ramesh , Gregory E. Bottomley , Paul W. Dent
发明人： Sandeep Chennakeshu , Rajaram Ramesh , Gregory E. Bottomley , Paul W. Dent
IPC分类号： H04J1/00 , H01Q1/24 , H01Q21/08 , H01Q21/28 , H04B1/10 , H04B1/12 , H04B7/005 , H04B7/08 , H04B7/10 , H04B7/185 , H04B7/195 , H04B7/204 , H04B7/212 , H04B7/26 , H04J1/12 , H04J3/00 , H04L1/00 , H04L1/06 , H04L25/02 , H04L25/03 , H04W16/02 , H04W16/14 , H04W74/08 , H04W84/02 , H04W84/04 , H04W84/06 , H04L25/08
CPC分类号： H01Q1/246 , H01Q21/08 , H01Q21/28 , H04B1/126 , H04B7/0851 , H04B7/10 , H04B7/18513 , H04B7/18515 , H04B7/18532 , H04B7/18567 , H04B7/2041 , H04L1/06 , H04L25/0204 , H04L25/021 , H04L25/03331 , H04W16/02 , H04W84/025 , H04B7/0837 , H04L1/007 , H04L25/03203 , H04L25/0328 , H04L25/03299 , H04W16/14 , H04W74/08 , H04W84/042 , H04W84/06
摘要： A multi-signal cancelling demodulator in which signals of interest are demodulated using information obtained during demodulation of adjacent signals. By utilizing detected information in an across-channel fashion, exemplary cancelling demodulators provide superior adjacent channel interference rejection. The cancelling demodulation is conducted in either serial or parallel fashion. In exemplary parallel demodulation embodiments, two channels are demodulated simultaneously in iterative fashion. Detected information obtained at each step in the iterative process is used as a priori information for demodulation in a following step. In exemplary serial demodulation embodiments, the stronger of two received signals is demodulated, and the resulting detected information is used as a priori information for demodulation of the weaker of the two received signals. For both the serial and parallel demodulation embodiments, novel techniques are disclosed for transforming symbols detected in one frequency band to corresponding symbols in adjacent frequency bands. Such inter-channel transformations are also applied in the context of channel estimation. In an exemplary channel estimator, multiple channel parameter estimates for a particular frequency channel are provided based on a received baseband signal corresponding to that frequency channel. Since inter-channel information is used in providing the channel parameter estimates, the exemplary channel estimator provides superior adjacent channel interference rejection.
摘要翻译：一种多信号消除解调器，其中使用在相邻信号的解调期间获得的信息来解调感兴趣的信号。通过利用跨信道方式的检测信息，示例性的消除解调器提供了优越的相邻信道干扰抑制。取消解调以串行或并行方式进行。在示例性并行解调实施例中，两个信道以迭代方式同时被解调。在迭代处理中的每个步骤获得的检测信息被用作以下步骤中的解调的先验信息。在示例性串行解调实施例中，两个接收信号中的较强者被解调，并且所得到的检测信息被用作用于解调两个接收信号较弱的先验信息。对于串行和并行解调实施例，公开了用于将在一个频带中检测的符号变换为相邻频带中的相应符号的新颖技术。这样的信道间变换也在信道估计的上下文中应用。在示例性信道估计器中，基于对应于该频率信道的接收基带信号来提供针对特定频率信道的多信道参数估计。由于在提供信道参数估计中使用信道间信息，所以示例性信道估计器提供了优越的相邻信道干扰抑制。

10. 发明授权

US06975582B1 Dual mode satellite/cellular terminal 失效
标题翻译：双模卫星/蜂窝终端
公开(公告)号：US06975582B1
公开(公告)日：2005-12-13
申请号：US09261209
申请日：1999-03-03
申请人： Peter D. Karabinis , Paul W. Dent , Sandeep Chennakeshu
发明人： Peter D. Karabinis , Paul W. Dent , Sandeep Chennakeshu
IPC分类号： H04B7/185 , H04J9/00 , H04W88/06
CPC分类号： H04B7/18563 , H04W88/06
摘要： A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information.
摘要翻译：公开了使用时分多址和自适应发送和接收来传送信息的方法和装置。信号突发从TDMA发射机发送到TDMA接收机，其中发射机对信息进行编码，并使用重复的TDMA帧周期中的多个时隙的两个时隙中的至少一个时隙向接收机发送编码信息。无论发射机是使用一个或两个时隙发射，并且接收到的信号被分类为预期和非目的，两个时隙都被接收。然后将分类为预期的随后接收信号组装成用于解码的块以再现信息。

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