公开(公告)号：US5535432A

公开(公告)日：1996-07-09

申请号：US305780

申请日：1994-09-14

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H03L7/197 ,  H03L7/23 ,  H04B1/40 ,  H04B7/155 ,  H04B7/185

CPC分类号： H04B7/18563 ,  H03L7/1974 ,  H03L7/23 ,  H04B1/406

摘要： A radio telephone which is capable of switching between operating through a land based cellular network and an orbiting satellite system is disclosed. First antenna and radio frequency circuits receive transmitted signals from the land-based network and form first conditioned signals for subsequent numerical decoding. Second antenna and radio frequency circuits receive transmitted signals from the orbiting satellite system and form second condition signals for subsequent numerical decoding. Numerical decoders process either the first condition signals or the second conditioned signals to provide an automatic frequency control signal. Reference frequency oscillators controlled by the automatic frequency control signal provide a reference frequency signal. Radio frequency synthesizers using the reference frequency signal and having a first output at a first programmable frequency connected to the first radio frequency circuits determine reception of a channel frequency of the land-based network and a second output at a second programmable frequency connected to the second radio frequency circuits determine reception of a channel frequency of the orbiting satellite system.

摘要翻译： 公开了能够通过基于陆地的蜂窝网络和轨道卫星系统进行切换的无线电话。 第一天线和射频电路接收来自陆基网络的发射信号，并形成用于后续数字解码的第一条件信号。 第二天线和射频电路接收来自轨道卫星系统的传输信号，并形成第二条件信号用于随后的数字解码。 数字解码器处理第一条件信号或第二条件信号以提供自动频率控制信号。 由自动频率控制信号控制的参考频率振荡器提供参考频率信号。 使用参考频率信号并且具有连接到第一射频电路的第一可编程频率的第一输出的射频合成器确定陆基网络的信道频率的接收和连接到第二射频电路的第二可编程频率的第二输出 射频电路确定轨道卫星系统的信道频率的接收。

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。

公开(公告)号：US5430760A

公开(公告)日：1995-07-04

申请号：US222008

申请日：1994-04-04

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/005 ,  H04B7/26 ,  H04B15/00 ,  H04L7/00 ,  H04W16/14 ,  H04W52/48 ,  H04W52/50 ,  H04W74/08 ,  H04J13/04 ,  H04B7/216

CPC分类号： H04W56/0045 ,  H04J13/004 ,  H04W52/48 ,  H04W52/50 ,  H04B2201/709709 ,  Y02B60/50

摘要： The present invention includes a system and method for minimizing interference between two radio stations, e.g., a mobile radio telephone and a fixed base station, at the initiation of a radio communication. A mobile station initiates a random access at the lowest power level and increases the transmission power level until the base station detects the access signal. Once detected, the power level of the message is maintained at the detected level so that the signal interference is avoided. The present invention also provides a mechanism for synchronizing random access communications between mobile stations and the base station despite variation in distances between the mobile and base stations.

摘要翻译： 本发明包括在无线电通信开始时最小化两个无线电台（例如移动无线电话和固定基站）之间的干扰的系统和方法。 移动台在最低功率电平下发起随机接入，并增加发射功率电平直到基站检测到接入信号。 一旦检测到，则消息的功率电平保持在检测到的电平，从而避免信号干扰。 本发明还提供了用于在移动站和基站之间的距离变化的情况下使移动站和基站之间的随机接入通信同步的机制。

公开(公告)号：US5428668A

公开(公告)日：1995-06-27

申请号：US148828

申请日：1993-11-04

申请人： Paul W. Dent ,  Jacobus C. Haartsen

发明人： Paul W. Dent ,  Jacobus C. Haartsen

IPC分类号： H04J3/00 ,  H04B15/00 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04W12/06 ,  H04W16/16 ,  H04W16/32 ,  H04W28/26 ,  H04W74/08 ,  H04W84/14 ,  H04Q7/22 ,  H04Q7/30

CPC分类号： H04W16/16 ,  H04W12/06 ,  H04W74/006 ,  H04W16/32 ,  H04W28/26 ,  H04W74/0833 ,  H04W84/045 ,  H04W84/14

摘要： Transceiver frequency and optionally power level are allocated to a radio personal communications system which includes a base station connected to a wire telephone network and a cellular terminal operating within a region of a wide area cellular network to minimize interference between communications over the wide area cellular network and communications between the base station and the cellular terminal. The same cellular terminal may thus be used to communicate over the lower cost wire network when within range of the base station and over the wide area cellular network otherwise. The frequency for communications between the cellular terminal and the base station are optionally assigned by the operator of the wide area cellular network so appropriate frequencies and power levels can be assigned for base stations, to minimize same channel interference with the wide area cellular network.

摘要翻译： 收发机频率和可选的功率电平被分配给无线电个人通信系统，该无线电个人通信系统包括连接到有线电话网络的基站和在广域蜂窝网络的区域内操作的蜂窝终端，以最小化在广域蜂窝网络上的通信之间的干扰 以及基站和蜂窝终端之间的通信。 因此，相同的蜂窝终端可以用于在基站的范围内以及广域蜂窝网络上通过较低成本的有线网络进行通信。 蜂窝终端和基站之间的通信频率可选地由广域蜂窝网络的运营商分配，从而可以为基站分配适当的频率和功率电平，以最小化与广域蜂窝网络的相同信道干扰。

公开(公告)号：US5425049A

公开(公告)日：1995-06-13

申请号：US140468

申请日：1993-10-25

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B1/713 ,  H04B1/715 ,  H04J13/00 ,  H04W16/02 ,  H04W16/12

CPC分类号： H04W16/12 ,  H04B1/713 ,  H04B1/715 ,  H04J13/00 ,  H04W16/02 ,  H04B2001/7154

摘要： A communication system having a frequency hopping scheme which provides increased interferer diversity without increased system delay is disclosed. The frequency hopping scheme includes providing a staggered offset period between hops of neighboring or adjacent base stations so as to create additional interference situations (diversity).

摘要翻译： 公开了一种具有跳频方案的通信系统，其提供增加的干扰源分集而不增加系统延迟。 跳频方案包括在相邻或相邻基站的跳跃之间提供交错的偏移周期，以便产生额外的干扰情况（分集）。

公开(公告)号：US5390245A

公开(公告)日：1995-02-14

申请号：US43758

申请日：1993-04-07

申请人： Paul W. Dent ,  Alex K. Raith ,  Jan. E. A. S. Dahlin

发明人： Paul W. Dent ,  Alex K. Raith ,  Jan. E. A. S. Dahlin

IPC分类号： H04W12/06 ,  H04L9/32

CPC分类号： H04W12/06 ,  H04W12/12

摘要： Methods for carrying out an authentication check in a mobile telephone system in which an authentic base station serves a plurality of mobile stations. A prior method carried out a unidirectional check from the base to a calling mobile, permitting a false base to carry out a false authentication check by collecting a number of so-called RAND-Response pairs. To avoid this problem, another unidirectional, base-to-mobile, authentication check and an authentication check from the mobile to the base are carried out. In one embodiment, only the bi-directional authentication check is carried out.

摘要翻译： 在真实基站服务于多个移动台的移动电话系统中执行认证检查的方法。 先前的方法执行从基地到呼叫移动台的单向检查，允许假基地通过收集许多所谓的RAND-响应对来执行虚假认证检查。 为了避免这个问题，进行了从移动到基地的另一个单向，基站到移动的认证检查和认证检查。 在一个实施例中，仅执行双向认证检查。

公开(公告)号：US5361404A

公开(公告)日：1994-11-01

申请号：US61038

申请日：1993-05-14

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/08 ,  H04L1/06 ,  H04B17/02

CPC分类号： H04L1/06 ,  H04B7/0857

摘要： Two or more signal paths are provided for receiving a radio frequency signal. One or more signal paths include conventional bandpass filters for eliminating interference and noise signals. One or more remaining signal paths include reduced filtering devices for increasing the sensitivity of a radio frequency receiver to the desired signal. Each of the receiving paths is coupled to a respective radio frequency amplifier. Provided that each radio frequency amplifier has equivalent current-source output impedances, the output signals from each amplifier are added constructively if they are in-phase. If the output signals are out-of-phase, a phase inverter inverts the phase of one signal so that the signals may be added constructively. The combined signals of the two or more radio frequency amplifiers pass through various signal processing components associated with conventional superheterodyne receivers. A control unit produces gain variation signals for controlling the gain of each radio frequency amplifier. Accordingly, the control unit controls whether the desired signal is received from a first signal path, a second signal path, or as a weighted combination of two or more signal paths.

摘要翻译： 提供两个或更多个信号路径用于接收射频信号。 一个或多个信号路径包括用于消除干扰和噪声信号的常规带通滤波器。 一个或多个剩余的信号路径包括用于增加射频接收机对期望信号的灵敏度的减小的滤波装置。 每个接收路径耦合到相应的射频放大器。 如果每个射频放大器具有等效的电流源输出阻抗，则如果它们同相，则来自每个放大器的输出信号被建设性地添加。 如果输出信号异相，则相位反相器将一个信号的相位反相，从而可以建设性地添加信号。 两个或更多个射频放大器的组合信号通过与常规超外差接收器相关联的各种信号处理部件。 控制单元产生用于控制每个射频放大器的增益的增益变化信号。 因此，控制单元控制是否从第一信号路径，第二信号路径或两个或更多个信号路径的加权组合接收期望的信号。

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。

公开(公告)号：US5230003A

公开(公告)日：1993-07-20

申请号：US652544

申请日：1991-02-08

申请人： Paul W. Dent ,  Alex K. Raith

发明人： Paul W. Dent ,  Alex K. Raith

IPC分类号： H03M13/00 ,  H04L1/00

CPC分类号： H04L1/0059 ,  H03M13/00 ,  H04L1/0046 ,  H04L1/0071

摘要： A decoding system discriminates between different types of communications traffic signals. Each type of traffic signal is encoded using a different error correction code. Plural, parallel decoders each decode a received traffic signal using a different decoding technique. Each decoding technique operates in accordance with one of the error correction codes. A quantitative measurement of the reliability of a decoded result is generated by each decoder. A comparison processor accumulates the quantitative measurements made by each decoder and compares the accumulated values. That decoder having the most reliable, accumulated value is selected to decode the current traffic signals. The remaining decoders are deactivated to conserve processing time.

摘要翻译： 解码系统区分不同类型的通信业务信号。 每种类型的交通信号都使用不同的纠错码进行编码。 多个并行解码器使用不同的解码技术对接收到的交通信号进行解码。 每个解码技术根据纠错码之一进行操作。 每个解码器产生解码结果的可靠性的定量测量。 比较处理器累积由每个解码器进行的定量测量并比较累积值。 选择具有最可靠的累加值的解码器来解码当前的交通信号。 剩余的解码器被禁用以节省处理时间。

公开(公告)号：US5095288A

公开(公告)日：1992-03-10

申请号：US611523

申请日：1990-11-13

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H03L7/093 ,  H03L7/089 ,  H03L7/107

CPC分类号： H03L7/0893 ,  H03L7/107 ,  H03L2207/04 ,  H03L7/0898

摘要： The invention relates to a phase-locked loop having a variable bandwidth and comprising a controlled oscillator, a phase comparison device, two current generating devices (21-22, 25-26) and a loop filter (23-24). Each of the current generating devices is intended to produce a positive or a negative pulsed current in response to signals from the phase comparison device. The outputs of the current generating devices are each connected to a respective point in the loop filter. The loop bandwidth can be varied continuously while maintaining a desired damping factor, by increasing the amplitude of the currents from each of the current generating devices (21-22, 25-26) when the bandwidth is to be increased, and vice versa.