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11. 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。

12. 发明授权

US5933763A Circuitry and method for improved signal reception acknowledgment in a radio communication system 失效
标题翻译：一种用于在无线电通信系统中改善信号接收确认的电路和方法
公开(公告)号：US5933763A
公开(公告)日：1999-08-03
申请号：US764672
申请日：1996-12-11
申请人： Eric Yi-Pin Wang , Kumar Balachandran , Amer Hassan , Sandeep Chennakeshu
发明人： Eric Yi-Pin Wang , Kumar Balachandran , Amer Hassan , Sandeep Chennakeshu
IPC分类号： H04B7/15 , H04B7/185 , H04L1/00 , H04L1/16 , H04L1/18 , H04W68/00 , H04W68/02 , H04Q7/08 , H04Q7/10 , H04Q7/12
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.
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。在接收时，确认信号使用多个相关器进行相关。发送确认寻呼信号的接收的增加的余量确认信号以促进确认信号的通信回到网络站。

13. 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。

14. 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。

15. 发明授权

US5488635A Low complexity adaptive equalizer radio receiver employing reduced complexity branch metric calculation 失效
标题翻译：低复杂度自适应均衡器无线电接收机采用降低复杂度的分支度量计算
公开(公告)号：US5488635A
公开(公告)日：1996-01-30
申请号：US143027
申请日：1993-10-29
申请人： Sandeep Chennakeshu , Ravinder D. Koilpillai , Raymond L. Toy
发明人： Sandeep Chennakeshu , Ravinder D. Koilpillai , Raymond L. Toy
IPC分类号： H04L25/03 , H03D1/00 , H04L27/06
CPC分类号： H04L25/03197 , H04L2025/03401 , 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 complexity is reduced by tracking a reduced number of estimated reference symbol constellation points and taking advantage of the geometry to estimate the remaining symbol constellation points. Branch metrics are also determined with a reduced number of computations.
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。通过跟踪减少数量的估计参考符号星座点并利用几何来估计剩余的符号星座点来减少复杂度。分支度量也用减少的计算数量确定。

16. 发明授权

US5151926A Sample timing and carrier frequency estimation circuit for sine-cosine detectors 失效
标题翻译：正弦余弦检波器的采样定时和载波频率估计电路
公开(公告)号：US5151926A
公开(公告)日：1992-09-29
申请号：US703516
申请日：1991-05-21
申请人： Sandeep Chennakeshu , Gary J. Saulnier
发明人： Sandeep Chennakeshu , Gary J. Saulnier
IPC分类号： H03D3/00 , H04L7/04 , H04L27/233
CPC分类号： H04L27/2338 , H03D3/007 , H04L7/042 , H03D2200/0035 , H03D2200/005 , H03D2200/0062 , H03D3/006
摘要： A digital radio receiver for synchronization of radiowave transmissions for digital and analog FM signals in TDMA systems such as cellular telephones uses a Sine/Cosine detector that minimizes the bit error rate. The detector employs an A/D converter, a sorter circuit that produces a predetermined number of samples to be used in the decoding based upon a sample timing adjustment, and a sample and phase adjustment circuit that selects samples based on a sample timing adjustment and adds a carrier phase adjustment to the samples. A cosine detector and a sine detector each decode samples into signals that are measured by a cosine level check circuit and a sine level check circit respectively. A decision logic circuit produces a pair of bits from the levels detected by the cosine level check circuit and the sine level check circuit as the decoded transmitted information. Adjustments to the sample timing and carrier phase are performed by an adjustment circuit that monitors the phase error between the decoded information and a predetermined information set in the preamble of each TDMA slot. The adjustment circuit sends the sample timing and carrier phase adjustments to the SPA circuit which selects different samples to be decoded and uses the carrier phase adjustment to recalculate different coefficients from these samples and pass the signal through the remainder of the circuit and eventually to the adjustment circuit. The signal is iteratively cycled through this loop until the best sample timing and carrier phase adjustments are reached.
摘要翻译：用于在诸如蜂窝电话的TDMA系统中用于数字和模拟FM信号的无线电波传输的同步的数字无线电接收机使用最小化误码率的正弦/余弦检测器。检测器采用A / D转换器，分选器电路，其基于采样定时调整产生将用于解码中的预定数量的采样，以及采样和相位调整电路，其基于采样定时调整来选择采样，并且添加样品的载体相位调整。余弦检测器和正弦检测器各自将样本解码为由余弦电平检查电路和正弦电平检查电路测量的信号。决定逻辑电路从由余弦电平检查电路和正弦电平检查电路检测的电平产生一对位作为解码的发送信息。对采样定时和载波相位的调整由监视解码信息与每个TDMA时隙的前导码中设置的预定信息之间的相位误差的调整电路来执行。调整电路将采样定时和载波相位调整发送到SPA电路，该电路选择不同的待解码样本，并使用载波相位调整从这些采样中重新计算不同的系数，并将信号通过电路的其余部分并最终调整电路。信号通过该循环迭代循环，直到达到最佳采样定时和载波相位调整。

17. 发明授权

US07099410B1 Reduced complexity MLSE equalizer for M-ary modulated signals 失效
标题翻译：降低复杂度MLSE均衡器用于M-ary调制信号
公开(公告)号：US07099410B1
公开(公告)日：2006-08-29
申请号：US09237356
申请日：1999-01-26
申请人： Sandeep Chennakeshu , Kambiz Zangi , Gregory E. Bottomley
发明人： Sandeep Chennakeshu , Kambiz Zangi , Gregory E. Bottomley
IPC分类号： H04L27/06
CPC分类号： H04L25/03197 , H04L25/03299
摘要： The present invention involves demodulation of radio signals modulated with M-ary modulation in the presence of intersymbol interference distortion. The invention presents a method for reducing the number of multiplications needed to implement a maximum-likelihood-sequence-estimation (MLSE) equalizer for signals modulated with M-ary modulation. In exemplary embodiments of the present invention, the number of multiplications is reduced by pre-computing certain values needed for the determination of the branch metric and storing these pre-computed values in a product table. When a branch metric computation is to be made, whether it is an Euclidean branch metric computation or an Ungerboeck branch metric computation, certain multiplication operations are replaced by simple table look-up operations. As a result, the power efficiency and speed of the system are increased. Any receiver that demodulates signals that are modulated with M-ary modulation can be implemented using the present invention. The resulting demodulator will have a lower complexity than existing demodulators.
摘要翻译：本发明涉及在存在符号间干扰失真的情况下解调用M进制调制的无线电信号。本发明提出了一种用于减少对用M-ary调制调制的信号实现最大似然序列估计（MLSE）均衡器所需的乘法次数的方法。在本发明的示例性实施例中，通过预先计算确定分支度量所需的某些值并将这些预先计算的值存储在产品表中来减少乘法次数。当进行分支度量计算时，无论是欧几里德分支度量计算还是Ungerboeck分支度量计算，某些乘法运算都被简单的表查找操作所取代。结果，系统的功率效率和速度增加。可以使用本发明来实现解调通过M进制调制调制的信号的任何接收机。所产生的解调器将具有比现有解调器更低的复杂度。

18. 发明授权

US06563861B1 Doppler spread estimation system 有权
标题翻译：多普勒扩展估计系统
公开(公告)号：US06563861B1
公开(公告)日：2003-05-13
申请号：US09273480
申请日：1999-03-22
申请人： Leonid Krasny , Sandeep Chennakeshu , David Koilpillai
发明人： Leonid Krasny , Sandeep Chennakeshu , David Koilpillai
IPC分类号： H04B1500
CPC分类号： H04B7/01 , H04B1/707 , H04B1/709 , H04B2201/70701
摘要： A receiving apparatus Doppler spread estimator includes a receiver receiving signals over a transmission channel that varies over time due to fading and converting the signals to digital samples for processing. A stationarizer operatively associated with the receiver stationarizes the digital samples. An estimator is operatively associated with the stationarizer for estimating spectral density of the stationarized digital samples. The correlator is operatively coupled to the estimator for correlating the spectral density estimates with functions corresponding to hypotheses of plural Doppler spread values to select one of the Doppler spread values as an estimate of actual Doppler spread.
摘要翻译：接收装置多普勒扩展估计器包括接收器，其通过传输信道接收由于衰落而随时间变化的信号，并将信号转换为数字样本进行处理。与接收器可操作地相关联的台式计算机将数字样本平均化。估计器可操作地与台式计算机相关联，用于估计平台化数字样本的频谱密度。相关器可操作地耦合到估计器，用于将频谱密度估计与对应于多个多普勒扩展值的假设的函数相关联，以选择多普勒扩展值中的一个作为实际多普勒扩展的估计。

19. 发明授权

US06532374B1 Distributed radio telephone for use in a vehicle 有权
标题翻译：用于车辆的分布式无线电话
公开(公告)号：US06532374B1
公开(公告)日：2003-03-11
申请号：US09595318
申请日：2000-06-16
申请人： Sandeep Chennakeshu , David Townsend , David R. Irvin , Randy Bright
发明人： Sandeep Chennakeshu , David Townsend , David R. Irvin , Randy Bright
IPC分类号： H04B106
CPC分类号： H04B1/3822 , B60R11/0241 , H04M1/6091 , H04M2250/02
摘要： A radiotelephone includes a base unit mounted within the vehicle having a wide area transceiver for communicating with a station outside the vehicle, a control unit disposed in the vehicle remotely from the base unit, and a local area network for establishing a communication link between the base unit and the control unit. The local area network is adapted to transmit control and data signals between the base unit and the control unit. The control unit includes a keypad for entering commands and data that are transmitted to the base unit via the local area network, and a display for displaying information to the user. The control unit may also include a speaker and microphone. Alternatively, the speaker and microphone may be contained in a remote audio unit that is linked to the base unit via the local area network. The control unit may, for example, be incorporated into the steering wheel of a vehicle while the base unit is concealed in the trunk or under the seat of the vehicle.
摘要翻译：无线电话机包括安装在车辆内的基座单元，其具有用于与车辆外部的站通信的广域收发器，远离基本单元设置在车辆中的控制单元和用于在基座之间建立通信链路的局域网单元和控制单元。局域网适于在基本单元和控制单元之间传输控制和数据信号。控制单元包括用于输入通过局域网发送到基本单元的命令和数据的键盘，以及用于向用户显示信息的显示器。控制单元还可以包括扬声器和麦克风。或者，扬声器和麦克风可以包含在经由局域网链接到基本单元的远程音频单元中。例如，控制单元可以被结合到车辆的方向盘中，同时基座单元被隐藏在车厢的后备箱或座椅下方。

20. 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。

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