公开(公告)号：US5652748A

公开(公告)日：1997-07-29

申请号：US436452

申请日：1995-05-22

申请人： Petri Jolma ,  Risto Uola

发明人： Petri Jolma ,  Risto Uola

IPC分类号： H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04W36/18 ,  H04W52/40 ,  H04W56/00 ,  H04L27/30

CPC分类号： H04W36/18 ,  H04B1/7115 ,  H04B7/2628 ,  H04W52/40 ,  H04W56/00

摘要： A mobile station, and a method for making a handover in a CDMA cellular radio system, which includes in each cell at least one base station connected to the mobile stations in the cell. The connection includes both a traffic channel and one or more control channels. The transmissions of the base stations are not synchronized with each other. A mobile station, after having established a simultaneous connection with two or more of the base stations while making a handover, transmits to the base stations using the same spreading code. The signals received by the base stations are combined in a base station controller, or the like. The base stations with which the mobile station communicates simultaneously, transmit to the mobile station each using a different spreading code. The mobile station receives and demodulates each of the signals, transmitted with different spreading codes, by a different rake receiving unit independent of the other units, each receiving unit being synchronized with the signal from the base station it is receiving. The mobile station combines the signals it has received from the base stations and demodulated by using its plural rake receiving units.

摘要翻译： PCT No.PCT / FI94 / 00415 Sec。 371日期：1995年5月22日 102（e）日期1995年5月22日PCT 1994年9月19日PCT公布。 公开号WO95 / 08901 日期1995年3月30日A移动台以及在CDMA蜂窝无线电系统中进行切换的方法，其在每个小区中包括连接到小区中的移动站的至少一个基站。 连接包括业务信道和一个或多个控制信道。 基站的传输不是彼此同步的。 移动站在进行切换之后已经与两个或更多个基站建立了同时连接之后，使用相同的扩展码向基站发送。 由基站接收的信号在基站控制器等中组合。 移动台同时进行通信的基站，使用不同的扩展码向移动台发送。 移动台接收和解调用不同的扩展码发送的每个信号，由独立于其他单元的不同的rake接收单元，每个接收单元与其正在接收的基站的信号同步。 移动台组合从基站接收到的信号，并通过使用其多个耙式接收单元进行解调。

公开(公告)号：US5604765A

公开(公告)日：1997-02-18

申请号：US363773

申请日：1994-12-23

申请人： Ronald Bruno ,  Leonard Schuchman ,  Lloyd Engelbrecht

发明人： Ronald Bruno ,  Leonard Schuchman ,  Lloyd Engelbrecht

IPC分类号： G01S1/00 ,  G01S5/14 ,  G01S19/09 ,  G01S19/46 ,  G01S19/48 ,  H04W4/06 ,  H04W28/04 ,  H04W48/08 ,  H04W64/00 ,  H04W72/12 ,  H04W84/04 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04B1/69 ,  G01C21/206 ,  G01S1/68 ,  G01S19/21 ,  G01S19/46 ,  H04L27/103

摘要： A cellular telephone system having three or more cell sites with each cell site having a source of cellular communication signals and an RF transmitter and antenna for broadcasting the cellular communication signals. A direct sequence spread spectrum waveform carrying navigation signals is embedded in the cellular communication signals, including controlling the signal strength of the navigation signals so that the combined energy of the navigation signals from all cell sites at any location is at least a predetermined energy level below the energy level of the cellular communication signals. Each cell site includes timing for timing the operation of a GPS receiver. An RF signpost system comprising a plurality of low powered RF broadcast stations, one each at a plurality of scattered geographic locations, each low powered RF broadcast station broadcasting a direct sequence spread spectrum digital RF waveform and a modulator to modulate the digital RF waveform with location information identifying the geographic locations, respectively.

摘要翻译： 具有三个或更多个小区站点的蜂窝电话系统，每个小区站点具有蜂窝通信信号源，以及用于广播蜂窝通信信号的RF发射机和天线。 携带导航信号的直接序列扩展频谱波形嵌入到蜂窝通信信号中，包括控制导航信号的信号强度，使得来自任何位置的所有小区站点的导航信号的组合能量至少在下面的预定能量水平 蜂窝通信信号的能级。 每个小区站点包括用于对GPS接收机的操作进行定时的定时。 一种RF路标系统，包括多个低功率RF广播站，每个在多个分散的地理位置，每个低功率射频广播站广播直接序列扩频数字RF波形和调制器，用于调制具有位置的数字RF波形 分别标识地理位置的信息。

公开(公告)号：US5602833A

公开(公告)日：1997-02-11

申请号：US358425

申请日：1994-12-19

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04B7/15 ,  H04B7/216 ,  H04J11/00 ,  H04L1/12 ,  H04L27/30 ,  H04Q7/22 ,  H04Q7/24 ,  H04Q7/26 ,  H04Q7/30 ,  H04J13/02 ,  H04L27/28

CPC分类号： H04J13/0074 ,  H04B7/216 ,  H04J13/0048 ,  H04J13/102

摘要： Method and apparatus for generating orthogonally encoded communication signals for communication system subscribers using multiple orthogonal functions for each orthogonal communication channel. Digital data symbols for signal recipients are M-ary modulated using at least two n-length orthogonal modulation symbols, which are generally Walsh functions normally used within the communication system. These symbols are provided by a modulation symbol selector (124) typically from one or more code generators (126, 128), and the modulation is such that M equals a product of a total number of orthogonal functions and the number used to generate individual modulation symbols. Each group of log M encoded data symbols from data processing elements (100, 102) are mapped into one modulation symbol using the modulation symbol selection element (124) according to their binary values. In some embodiments, a fast Hadamard transformer is used for symbol mapping. The resulting communication signals are demodulated by correlating them with the preselected number of orthogonal functions, in parallel, and demodulating the results into M energy values representing each orthogonal modulation symbol. The energy values are mapped into energy metric data using a dual maximum metric generation process. The correlation and demodulation can be accomplished using at least two sets of N correlators (142), N being the number of functions used, and applying correlated signals to one demodulator for each set of correlators (144). Each demodulator outputs M energy values representing each of the M mutually orthogonal modulation symbols, which are then combined into a single set of M energy values. In further configurations, coherent demodulators (172, 174) can be used to produce amplitude values for received signals which are then combined (178) with dual maximum metric results (170) to produce composite metric values for data symbols (178).

公开(公告)号：US5594718A

公开(公告)日：1997-01-14

申请号：US413306

申请日：1995-03-30

申请人： Lindsay A. Weaver, Jr. ,  Gwain Bayley ,  Edward G. Tiedemann, Jr. ,  Klein S. Gilhousen

发明人： Lindsay A. Weaver, Jr. ,  Gwain Bayley ,  Edward G. Tiedemann, Jr. ,  Klein S. Gilhousen

IPC分类号： H04W36/14 ,  H04L27/30

CPC分类号： H04W36/0066 ,  H04W48/12

摘要： A method and system for providing a reliable means to perform handoff from a code division multiple access (CDMA) system using a pilot signal to an alternative access communication technique system. Simple pilot box circuitry is added to a set of border base stations. The border base stations are base stations which operate only in the alternative access communication technique and which have coverage areas which are contiguous with coverage areas of CDMA operation base stations. The mobile unit monitors for the pilot signal from the border base stations in the same manner as it monitors for pilot signals from the CDMA operation base stations. When the mobile unit detects the pilot signal corresponding to a border base station, it notifies a system controller in accordance with standard operation. The system controller is aware that the pilot signal corresponds to a border base station and thus triggers a hard handoff process to the alternative access communication technique system in response thereto.

摘要翻译： 一种用于提供从使用导频信号的码分多址（CDMA）系统到替代的接入通信技术系统执行切换的可靠装置的方法和系统。 简单的导频箱电路被添加到一组边界基站。 边界基站是仅在替代接入通信技术中工作的基站，其具有与CDMA操作基站的覆盖区域相邻的覆盖区域。 移动单元以与监视来自CDMA操作基站的导频信号相同的方式监视来自边界基站的导频信号。 当移动单元检测到与边界基站相对应的导频信号时，它根据标准操作通知系统控制器。 系统控制器知道导频信号对应于边界基站，从而触发对其进行的替代接入通信技术系统的硬切换过程。

公开(公告)号：US5592506A

公开(公告)日：1997-01-07

申请号：US324478

申请日：1994-10-17

申请人： Jimmy K. Omura ,  Paul T. Yang ,  Gurgen H. Khachatrian ,  Karen M. Nikogossian ,  Karen S. Hovakimian ,  Armen L. Vartapetian

发明人： Jimmy K. Omura ,  Paul T. Yang ,  Gurgen H. Khachatrian ,  Karen M. Nikogossian ,  Karen S. Hovakimian ,  Armen L. Vartapetian

IPC分类号： H04B1/707 ,  H04L27/233 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04B1/707 ,  H04L27/2332

摘要： A method for demodulating a received spread-spectrum signal using a minimum-shift-keyed (MSK) receiver. Using the method, an in-phase-component signal and a quadrature-phase-component signal are generated from a received spread-spectrum signal. The in-phase-component signal and the quadrature-phase-component signal are then processed and combined in such a way as to estimate data of the received-spread-spectrum signal.

摘要翻译： 一种使用最小移位键控（MSK）接收机来解调接收的扩频信号的方法。 使用该方法，从接收的扩频信号产生同相分量信号和正交相位分量信号。 然后对同相分量信号和正交分量信号进行处理和组合，以便估计接收扩展频谱信号的数据。

公开(公告)号：US5590160A

公开(公告)日：1996-12-31

申请号：US387031

申请日：1995-02-10

申请人： Kjell Ostman

发明人： Kjell Ostman

IPC分类号： H04B7/26 ,  H03H21/00 ,  H04B1/707 ,  H04B7/005 ,  H04B7/216 ,  H04J3/00 ,  H04L7/00 ,  H04L7/04 ,  H04L7/08 ,  H04L27/22 ,  H04Q7/38 ,  H04L7/02 ,  H04L27/30

CPC分类号： H04B1/7085 ,  H04L7/042 ,  H04L7/043 ,  H04B1/70735

摘要： A digital radio communication system includes a receiver for receiving a signal stream that includes data frames, each frame including a data signal sequence and a synchronizing signal sequence. The communication system synchronizes the receiver by employing the signal stream. The receiver comprises: a sampling circuit for sampling symbol levels in the synchronizing signal sequence; cross correlation circuitry for comparing values derived from the sampled symbol levels with an expected set of values and producing an error value output; and correction circuitry that is responsive to the error output and produces a sample control output to the sample circuitry to alter the times of sampling of the symbol levels so as to reduce the error output and achieve time synchronization with the received synchronizing signal sequence. A further embodiment of the invention is described in relation to a CDMA receiving system.

摘要翻译： 数字无线电通信系统包括用于接收包括数据帧的信号流的接收机，每个帧包括数据信号序列和同步信号序列。 通信系统通过采用信号流来同步接收机。 接收机包括：采样电路，用于对同步信号序列中的符号电平进行采样; 互相关电路，用于将从采样符号级别导出的值与期望的值集合进行比较并产生误差值输出; 以及校正电路，其响应于所述误差输出并且产生对所述采样电路的采样控制输出，以改变所述符号电平的采样次数，以便减少所述误差输出并实现与所接收的同步信号序列的时间同步。 关于CDMA接收系统描述本发明的另一实施例。

公开(公告)号：US5579335A

公开(公告)日：1996-11-26

申请号：US534574

申请日：1995-09-27

申请人： Philip H. Sutterlin ,  J. Marcus Stewart

发明人： Philip H. Sutterlin ,  J. Marcus Stewart

IPC分类号： H04B1/707 ,  H04B3/54 ,  H04L25/03 ,  H04L27/30

CPC分类号： H04B1/707 ,  H04B3/54 ,  H04L25/03019 ,  H04B2203/5408 ,  H04B2203/542

摘要： A method and apparatus for compensating for distortion in a spread spectrum communications system particularly useful where the spread spectrum is transmitted over a power line. The information carrying signal (ICS) is split into two sub-bands and the ICS in one sub-band (or a correlation value determined from the ICS in that sub-band) is delayed relative to the other sub-band. The ICS (or correlation values) from the two sub-bands are recombined after the delay and processed in an ordinary manner. The time delay is selected so as to compensate for the distortion. In one embodiment, the correlation peaks in each of the sub-bands are examined and the time delay is determined by, in effect, aligning the peaks in the two sub-bands in time so that when the two sub-bands are combined, a sharper correlation peak is obtained.

摘要翻译： 一种用于补偿扩频通信系统中的失真的方法和装置，其特征在于在电力线上传播扩频。 信息携带信号（ICS）被分成两个子带，并且一个子带中的ICS（或从该子带中的ICS确定的相关值）相对于另一个子带延迟。 来自两个子带的ICS（或相关值）在延迟之后重新组合并以常规方式处理。 选择时间延迟以补偿失真。 在一个实施例中，检查每个子带中的相关峰值，并且通过实际上确定时间上两个子带中的峰值来确定时间延迟，使得当两个子带被组合时， 获得更锐利的相关峰值。

公开(公告)号：US5481533A

公开(公告)日：1996-01-02

申请号：US241928

申请日：1994-05-12

申请人： Michael L. Honig ,  Upamanyu Madhow

发明人： Michael L. Honig ,  Upamanyu Madhow

IPC分类号： H04B7/26 ,  H04J13/16 ,  H04B7/204 ,  H04B15/00 ,  H04J13/04 ,  H04L27/30

CPC分类号： H04J13/16 ,  H04B7/2618

摘要： In a cellular network, a multiple-access methodology and concomitant circuitry in which TDMA is used inside each cell and CDMA signals, having pulse shapes with low cross-correlations, are assigned to adjacent cells. For example, these pulses could be Direct-Sequence Spread-Spectrum pulses. Such a hybrid system combines the high intra-cell capacity of TDMA with the inter-cell and multipath interference rejection capabilities of CDMA.

摘要翻译： 在蜂窝网络中，在每个小区内使用TDMA的多址方法和伴随电路以及具有低互相关的脉冲形状的CDMA信号被分配给相邻小区。 例如，这些脉冲可以是直接序列扩频脉冲。 这样的混合系统将TDMA的高小区容量与CDMA的小区间和多径干扰抑制能力相结合。

公开(公告)号：US5469471A

公开(公告)日：1995-11-21

申请号：US190517

申请日：1994-02-01

申请人： Charles E. Wheatley, III

发明人： Charles E. Wheatley, III

IPC分类号： H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04L27/30 ,  H04J13/02

CPC分类号： H04W52/226 ,  H04W52/225 ,  H04W52/54

摘要： A link quality improvement system for a cellular communication system in which portable units are used to facilitate communication of information signals between system users, via at least one cell-site, using code division multiple access spread spectrum communication signals. The system enables users to improve the quality of reverse communication links from the portable units to the cell-site by providing to each system user a link quality signal indicative of power received at the cell-site relative to an optimum level of received power. At a cell-site communicating with a portable unit associated with a particular system user, the portable unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the portable unit for adjusting portable unit transmitter power. The command signals are also accumulated in order to enable generation of a link quality signal in response thereto. In a preferred implementation the link quality signal is an audible interference signal inducing the system user to adjust orientation of the portable communication unit so as to improve signal quality on the reverse link.

摘要翻译： 一种用于蜂窝通信系统的链路质量改进系统，其中使用便携式单元来通过至少一个小区站点使用码分多址扩展频谱通信信号促进系统用户之间的信息信号的通信。 该系统使用户能够通过向每个系统用户提供指示在小区站点处相对于接收功率的最佳等级接收的功率的链路质量信号来提高从便携式设备到小区站点的反向通信链路的质量。 在与与特定系统用户相关联的便携式单元进行通信的小区站点处，便携式单元发射功率是在小区现场接收的。 在小区站点生成指令信号并发送到便携式单元，用于调节便携式单元发射机功率。 还累积了命令信号，以便响应于此产生链路质量信号。 在优选实施例中，链路质量信号是可听干扰信号，引起系统用户调整便携式通信单元的方位，从而提高反向链路上的信号质量。

公开(公告)号：US5461610A

公开(公告)日：1995-10-24

申请号：US938072

申请日：1992-08-31

申请人： Vijitha Weerackody

发明人： Vijitha Weerackody

IPC分类号： H04Q7/38 ,  H04B7/26 ,  H04L27/30

CPC分类号： H04J11/0036 ,  H04B7/2628 ,  H04J13/10

摘要： A technique for reducing multiple access interference (MAI) experienced by receivers of transmissions from a transmitter, e.g., a base station, in a direct-sequence code division multiple access communication system, e.g., a cellular radio system, is disclosed. The technique provides for the precoding of user signature sequences for use in spreading information signals to be transmitted. The use of precoded signature sequences significantly reduces the average level of MAI experienced by the receivers. Despreading of received signals by receivers may be accomplished with the original (i.e., non-precoded) signature sequences. Thus, no changes to receivers are required. The technique includes a feature for determining a set of sequences for both transmitter and receiver from a smaller set of orthogonal sequences.

摘要翻译： 公开了用于减少来自发射机（例如基站）的传输的接收机经历的直接序列码分多址通信系统（例如蜂窝无线电系统）中经历的多址接入干扰（MAI）的技术。 该技术提供用于在要发送的信息信号的扩展中使用的用户签名序列的预编码。 使用预编码签名序列显着降低了接收机经历的MAI的平均水平。 接收机对接收到的信号的去扩展可以用原始（即非预编码的）签名序列完成。 因此，不需要更改接收器。 该技术包括用于从较小的正交序列组确定发射机和接收机的一组序列的特征。