专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 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。

2. 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。

3. 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。

4. 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。

5. 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。

6. 发明授权

US5577068A Generalized direct update viterbi equalizer 失效
标题翻译：广义直接更新维特比均衡器
公开(公告)号：US5577068A
公开(公告)日：1996-11-19
申请号：US274727
申请日：1994-07-18
申请人： Gregory E. Bottomley , Sandeep Chennakeshu , Paul W. Dent , R. David Koilpillai
发明人： Gregory E. Bottomley , Sandeep Chennakeshu , Paul W. Dent , R. David Koilpillai
IPC分类号： H04B7/005 , H03M13/23 , H04L25/03 , H04B1/10 , H04L27/01
CPC分类号： H04B7/005 , H04L25/03184 , H04L25/03292
摘要： A radio receiver for demodulating and equalizing digital information is disclosed. The receiver receives radio signals and processes the signals to produce data samples which are then stored. Reference values that model what the receiver should receive for various transmitted symbol sequence hypotheses are also stored. The receiver equalizes the received data using the stored reference values to produce symbol detection information, and updates the reference values based on the symbol detection information.
摘要翻译：公开了用于解调和均衡数字信息的无线电接收机。接收机接收无线电信号并处理信号以产生然后被存储的数据样本。对存储各种发送的符号序列假设的接收机应该接收什么的参考值也被存储。接收机使用所存储的参考值均衡接收到的数据以产生符号检测信息，并且基于符号检测信息来更新参考值。

7. 发明授权

US06314081B1 High power short message service using dedicated carrier frequency 失效
标题翻译：使用专用载波频率的大功率短信业务
公开(公告)号：US06314081B1
公开(公告)日：2001-11-06
申请号：US08588507
申请日：1996-01-18
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： H04J1100
CPC分类号： H04W4/14 , H04B7/18567
摘要： A communication system and method for transmitting relatively short data messages in the communication system. A dedicated frequency is sequentially switched into each of a plurality of satellite beams or traffic channels to transmit data messages at an increased power level to provide an increased signal margin. The increased power level of the dedicated frequency can be combined with coding and bit and message repetition to further increase the signal margin.
摘要翻译：一种用于在通信系统中发送相对短的数据消息的通信系统和方法。专用频率被顺序地切换到多个卫星波束或业务信道中的每一个以在增加的功率电平上发送数据消息以提供增加的信号余量。专用频率的增加的功率电平可以与编码和比特和消息重复组合以进一步增加信号余量。

8. 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。

9. 发明授权

US5467374A Low complexity adaptive equalizer for U.S. digital cellular radio receivers 失效
标题翻译：用于美国数字蜂窝无线电接收机的低复杂度自适应均衡器
公开(公告)号：US5467374A
公开(公告)日：1995-11-14
申请号：US143028
申请日：1993-10-29
申请人： Sandeep Chennakeshu , Paul W. Dent , Ravinder D. Koilpillai , Raymond L. Toy
发明人： Sandeep Chennakeshu , Paul W. Dent , Ravinder D. Koilpillai , Raymond L. Toy
IPC分类号： H04L25/03 , H03D1/00
CPC分类号： H04L25/03197 , H04L2025/0356 , H04L2025/03796
摘要： A low complexity adaptive equalizer for use in U.S. digital cellular radios demodulates .pi./4-shifted differentially encoded quadrature phase shift keyed (DQPSK) encoding in the presence of intersymbol interference (ISI) with reduced decoding complexity by employing an estimated received constellation which takes into account channel changes over time and ISI. The decoding complexity is reduced by tracking a reduced number of estimated reference constellation points and taking advantage of the geometry to estimate the remaining symbol constellation points. A slot of symbols is decoded, employing unique filtering, in segments from the beginning in a forward direction and from the end in a reverse direction meeting at a fade point. This isolates a fade and allows the equalizer to perform more reliably.
摘要翻译：用于美国数字蜂窝无线电的低复杂度自适应均衡器在存在码间干扰（ISI）的情况下，通过采用估计的接收星座来解调具有降低的解码复杂度的π/ 4位差分编码正交相移键控（DQPSK）编码帐户频道随时间变化和ISI。通过跟踪估计的参考星座点的数量减少并利用几何来估计剩余的符号星座点来降低解码复杂度。符号的时隙被解码，采用独特的滤波，从开始的前进方向开始，并且在反向方向的结束处，在渐变点处会聚。这样隔离了一个淡入淡出，并允许均衡器执行得更可靠。

10. 发明授权

US5335250A Method and apparatus for bidirectional demodulation of digitally modulated signals 失效
标题翻译：用于数字调制信号的双向解调的方法和装置
公开(公告)号：US5335250A
公开(公告)日：1994-08-02
申请号：US965848
申请日：1992-10-22
申请人： Paul W. Dent , Sandeep Chennakeshu
发明人： Paul W. Dent , Sandeep Chennakeshu
IPC分类号： H04B7/08 , H04L25/03 , H04L25/30 , H04L27/233 , H04L29/12 , H04Q1/20
CPC分类号： H04L27/2337 , H04B7/0857 , H04L25/03178 , H04L2025/0356
摘要： A method and apparatus for demodulating data symbols transmitted through a fading communication channel. A plurality of first predetermined data symbols, a plurality of unknown data symbols, and a plurality of second predetermined data symbols are sequentially received. The received pluralities of data symbols are stored, and first and second sets of reference signals from the stored pluralities of first and second predetermined data symbols, respectively, are determined. The stored unknown data symbols based on the first set of reference signals are forward-demodulated, beginning with unknown symbols received nearer the first predetermined data symbols. The stored unknown data symbols based on the second set of reference signals are backward-demodulated, beginning with the unknown data symbols received nearer the second predetermined data symbols. Quality values indicative of demodulation qualities of the forward- and backward-demodulated data symbols are determined. The quality values are compared, and either the forward- or backward-demodulated data symbols are selected based on the comparison of quality values.
摘要翻译：一种解调通过衰落通信信道发送的数据符号的方法和装置。依次接收多个第一预定数据符号，多个未知数据符号和多个第二预定数据符号。存储所接收的多个数据符号，并且分别确定来自存储的多个第一和第二预定数据符号的第一和第二组参考信号。基于第一组参考信号的存储的未知数据符号被正向解调，从接近第一预定数据符号的未知符号开始。基于第二组参考信号存储的未知数据符号被从第二预定数据符号更接近的未知数据符号开始被反向解调。确定表示前向和后向解调数据符号的解调质量的质量值。比较质量值，并且基于质量值的比较来选择前向或后向解调的数据符号。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式