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公开(公告)号：US5222100A
公开(公告)日：1993-06-22
申请号：US903407
申请日：1992-06-24
IPC分类号： H04B1/7075 , H04B1/7077 , H04B1/708 , H04B1/709
CPC分类号： H04B1/70775 , H04B1/70758 , H04B1/709 , H04B1/70755 , H04B1/708
摘要： A novel range based acquisition system includes a receiver for receiving PN encoded signals coupled to a novel range based variable dwell correlator which detects and acquires uniquely timed received transmitter PN encoded signals employing different search dwell times for each of the estimated ranges from which the receiver transmitted PN encoded signals are being propagated so as to enhance the speed of acquisition of said PN encoded signals.
摘要翻译： 一种新颖的基于范围的采集系统包括一个接收器，用于接收耦合到新的基于范围的可变驻留相关器的PN编码信号，该相关器检测并获取对于接收器发射的估计范围中的每一个采用不同搜索驻留时间的唯一定时接收的发射机PN编码信号 正在传播PN编码的信号以增强所述PN编码信号的采集速度。
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公开(公告)号：US5299229A
公开(公告)日：1994-03-29
申请号：US10723
申请日：1993-01-29
IPC分类号： H04K1/02 , H04B1/7085 , H04L27/30
CPC分类号： H04B1/7085
摘要： A high PN code rate receiving system is provided for receiving, recovering and tracking a high rate PN composite code comprising a low rate PN code combined with a high rate PN code and wherein the receiving system comprises a broad band receiver for receiving the high rate PN composite code and further includes a data recovery channel and a tracking loop channel. The data recovery channel comprises a high rate mixer and a low rate mixer for removing the high data rate component code and the low data rate component code to provide a low data rate data stream. The tracking loop channel comprises a high rate early-late tracking system for producing a high rate error signal and further comprises a low rate portion of the tracking loop for producing a low rate error signal which is combined with the data output to provide a clock error signal. The clock error signal is applied to a voltage controlled oscillator to produce a low data rate clock and a high data rate clock which are coupled to a low data rate code generator and a high data rate code generator which synchronize the tracking loop and said data channel.
摘要翻译： 提供高PN码率接收系统用于接收，恢复和跟踪包括与高速率PN码组合的低速率PN码的高速率PN复合码，并且其中接收系统包括用于接收高速率PN 并且还包括数据恢复通道和跟踪循环通道。 数据恢复通道包括用于去除高数据速率分量代码和低数据速率分量代码以提供低数据速率数据流的高速率混频器和低速率混频器。 跟踪环通道包括用于产生高速率误差信号的高速率早期跟踪系统，并且还包括用于产生低速率误差信号的跟踪环路的低速率部分，该低速率误差信号与数据输出相结合以提供时钟误差 信号。 时钟误差信号被施加到压控振荡器以产生低数据速率时钟和高数据速率时钟，该数据速率时钟和高数据速率时钟耦合到低数据速率代码发生器和高数据速率代码发生器，其使跟踪环路和所述数据通道同步 。
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公开(公告)号：US5414730A
公开(公告)日：1995-05-09
申请号：US170604
申请日：1993-12-21
IPC分类号： H04B1/7073 , H04B1/7075 , H04B1/708 , H04B1/709 , H04K1/00
CPC分类号： H04B1/70752 , H04B1/708 , H04B1/70735 , H04B1/709
摘要： A novel PN code acquisition and demodulation circuit comprise an analog receiver coupled to an analog to digital converter. The digital output of the converter is passed through an N chip width parallel correlator. The parallel outputs are coherently accumulated to provide N soft decision data values one of which is indicative of the proper replica code for locking onto the data. All of the soft decision data values are stored in a high speed memory in real time. Subsequently non-coherent accumulated soft decision data is employed to detect the proper PN replica code. Logic selection means accesses the soft decision data stored in the high speed memory in non real time and selects the best estimate for the soft decision data and applies the soft decision data to a demodulator in non-real time to recover the hard data encoded in the received PN coded data.
摘要翻译： 一种新颖的PN码采集和解调电路包括耦合到模数转换器的模拟接收器。 转换器的数字输出通过N个芯片宽度的并行相关器。 并行输出被相干地累积以提供N个软判决数据值，其中一个指示用于锁定到数据上的适当副本代码。 所有软判决数据值实时存储在高速存储器中。 随后采用非相干累加软判决数据来检测正确的PN复制码。 逻辑选择装置以非实时的方式存取高速存储器中的软决策数据，并选择软判决数据的最佳估计，并以非实时的方式将软决策数据应用于解调器，以恢复编码在 接收到PN编码数据。
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公开(公告)号：US4817113A
公开(公告)日：1989-03-28
申请号：US44632
申请日：1987-05-01
CPC分类号： H04B1/7075 , G01S11/02
摘要： A method of rapidly reacquiring a pseudonoise spread spectrum coded signal after short outages includes calculating the new positions of the moving stations relative to the old positions of the moving stations and for determining the accurate displacement and the accurate direction the platforms have moved in their new direction after a short time outage. The method includes calculating a triangle which includes the displacement between the moving stations' old position and the moving stations new position and the included angle between the direction of movement and the line of sight between said moving platforms at the time of outage. A range displacement adjustment is calculated on the basis of the triangle for each moving station and the range factor resulting from this calculation is applied to the PN generators of the receiver and transmitter in each of the moving stations to independently adjust for each station's movement. The directional antennas of the moving stations are pointed in new directions toward the area in which the other moving station will be found. The directional antennas are moved simultaneously toward each other and a sweep or reacquisition adjustment of the PN generators of each moving station is made employing a small window of uncertainty which results in reacquisition of the PN coded signal being transmitted from the other station.
摘要翻译： 在短暂停机后快速重新获取伪噪声扩频编码信号的方法包括计算移动站相对于移动站的旧位置的新位置，并确定平台在新方向上移动的精确位移和准确方向 经过短暂的中断。 该方法包括计算三角形，该三角形包括移动台的旧位置与移动台之间的新位置之间的位移以及在停机时所述移动平台之间的运动方向与视线之间的夹角。 基于每个移动站的三角形来计算范围位移调整，并且由该计算得到的范围因子被应用于每个移动站中的接收机和发射机的PN发生器，以独立地调整每个站的运动。 移动台的定向天线指向另一个移动站将被发现的区域的新方向。 定向天线同时朝向彼此移动，并且使用小的不确定窗口来进行每个移动站的PN发生器的扫描或重新捕获调整，这导致从另一个站发送的PN编码信号的重新获取。
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公开(公告)号：US5495509A
公开(公告)日：1996-02-27
申请号：US216746
申请日：1994-03-23
IPC分类号： H04B1/708 , H04B1/7085 , H04L7/00 , H04B1/707 , H04J3/06
CPC分类号： H04B1/708 , H04B1/7085
摘要： Apparatus for rapidly acquiring a high performance gain long PN code having a preamble header in real time includes appratus for rapid acquiring and tracking a short PN code in said preamble header and further includes apparatus for demodulating and tracking a long PN code which follows said preamble header. After acquiring the short PN code, the short PN replica code is applied to the long code demodulation and tracking apparatus. The short PN code is employed to synchronize the long code demodulation and tracking apparatus by detecting the time of occurrence of a sync word in said preamble header and is employed to generate a switch point signal and switch from a short PN replica code to a long PN replica code at the input to the long code demodulation and tracking device in real time.
摘要翻译： 用于快速获取具有前导码头的高性能增益长PN码的设备包括用于在所述前同步码报头中快速获取和跟踪短PN码的装置，并且还包括用于解调和跟踪跟随所述前同步头的长PN码的装置 。 在获取短PN码之后，将短PN复制码应用于长码解调和跟踪装置。 短PN码用于通过检测所述前同步码报头中同步字的出现时间来同步长码解调和跟踪装置，并用于产生切换点信号并从短PN复制码切换到长PN 复制代码在输入到长码解调和跟踪设备的实时。
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公开(公告)号：US4852121A
公开(公告)日：1989-07-25
申请号：US111372
申请日：1987-10-16
IPC分类号： H04B1/7085
CPC分类号： H04B1/7085
摘要： A coherent pseudonoise code (PN) tracking loop is provided with apparatus for sensing the absence of PN transition in the incoming data stream to the tracking loop and for switching OFF the data stream to prevent phase error distortion and inherent noise from entering the tracking loop which could be sensed as false or incorrect phase error signals. The apparatus includes a transition switch in the incoming data stream that is responsive to transition gate control logic coupled to the output of the PN replica generator in the tracking loop for switching OFF the incoming data stream when no PN transitions are occurring.
摘要翻译： 提供了一种相干伪噪声码（PN）跟踪环路，该装置用于感测在进入数据流中的跟踪环路中不存在PN转换，并且关闭数据流以防止相位误差失真和固有噪声进入跟踪环路 可以被感测为假或不正确的相位误差信号。 该装置包括输入数据流中的转换开关，其响应于在跟踪环路中耦合到PN复制发生器的输出的转换门控制逻辑，用于在没有发生PN转换时切换输入数据流。
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公开(公告)号：US4441194A
公开(公告)日：1984-04-03
申请号：US379597
申请日：1982-05-19
IPC分类号： H04B1/7093 , H04L25/06 , H04L27/233 , H03D3/06
CPC分类号： H04B1/7093 , H04L25/067 , H04L27/2334
摘要： A non-coherent receiving system is provided with a novel triple-bit matched filter detector system which provides two outputs indicative of the data stream being detected. A preliminary or soft decision is made concerning the state of the bits in the data stream. One of the outputs provides a best estimate of state of the data bit being detected and the other output provides the second best estimate of the state of the data bits being detected. The incoming data stream is processed and modified as it is shifted through a plurality of shift registers in real time employing the data bits subsequently detected. A controller is provided to make a plurality of predetermined evaluations of the state of the bits in the data stream and to provide a final or hard decision of the correct state of the data bits previously detected.
摘要翻译： 非相干接收系统具有新颖的三比特匹配滤波器检测器系统，其提供指示被检测的数据流的两个输出。 对数据流中的位的状态进行初步或软判决。 其中一个输出提供了被检测的数据位的状态的最佳估计，而另一个输出提供了正被检测的数据位的状态的第二最佳估计。 当采用随后检测到的数据位实时地移入多个移位寄存器时，对输入数据流进行处理和修改。 提供控制器以对数据流中的位的状态进行多个预定评估，并提供对先前检测到的数据位的正确状态的最终或硬判决。
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公开(公告)号：US4776012A
公开(公告)日：1988-10-04
申请号：US39340
申请日：1987-04-17
IPC分类号： H04B1/7075 , H04L9/04
CPC分类号： H04B1/70756
摘要： The present invention is concerned with an apparatus and a method of jumping a composite PN code from a current phase position to a desired predetermined phase position so as to enhance acquisition of a composite PN code. The apparatus includes a plurality of individual PN code generators which are connected to a code combiner to produce a composite PN code. Each of the individual PN code generators is driven by its own timing gate for supplying synchronized clock pulses to its own PN code generator. A master clock is connected to a timing gate before being connected to the individual PN code generators. An inhibit input at each of the individual timing gates is provided so that the individual PN generators may be inhibited a predetermined number of clock pulses which causes the PN code generated to be inhibited and has the effect of jumping the PN code a desired number of phase positions.
摘要翻译： 本发明涉及将复合PN码从当前相位位置跳转到期望的预定相位位置的装置和方法，以便增强复合PN码的采集。 该装置包括多个单独的PN码发生器，其连接到码组合器以产生复合PN码。 每个PN码发生器由其自己的定时门驱动，用于向其自身的PN码发生器提供同步的时钟脉冲。 在连接到各个PN码发生器之前，主时钟连接到定时门。 提供每个各个定时门处的禁止输入，使得各个PN发生器可以被禁止预定数量的时钟脉冲，这导致产生的PN码被禁止并且具有跳转PN码所需数量的相位的效果 职位
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公开(公告)号：US07558238B1
公开(公告)日：2009-07-07
申请号：US11335439
申请日：2006-01-18
IPC分类号： H04B7/216
CPC分类号： H04B7/2615 , H04B7/2618 , H04W74/02
摘要： A method for partitioning communication resource among multiple users partitions a portion of an available communication resource into a series of time-frequency slots, and allows multiple users to transmit in one of at least two available modes within a time-frequency slot. Preferably, one mode is time division of the time-frequency slot into time sub-slots, and another mode is code division of the time-frequency slot according to different spreading codes that spread an individual user's signal only within the subject time-frequency slot. Further details as to pilot signals, guard intervals, and payloads are described.
摘要翻译： 一种用于在多个用户中分配通信资源的方法将可用通信资源的一部分划分成一系列时隙，并且允许多个用户以时隙内的至少两种可用模式之一进行发送。 优选地，一种模式是时间 - 时隙到时间子时隙的时分，另一种模式是根据不同的扩展码对时间 - 时隙进行码分割，这些扩展码仅在主体时隙内扩展单个用户的信号 。 对导频信号，保护间隔和有效负载的进一步细节进行了说明。
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公开(公告)号：US5499236A
公开(公告)日：1996-03-12
申请号：US291648
申请日：1994-08-16
申请人： Thomas R. Giallorenzi , Mark T. Rafter , Kenneth C. Greenwood , Harry B. Press , Samuel C. Kingston
发明人： Thomas R. Giallorenzi , Mark T. Rafter , Kenneth C. Greenwood , Harry B. Press , Samuel C. Kingston
IPC分类号： H04B1/7085 , H04B1/7103 , H04J3/06 , H04J13/00 , H04J14/00 , H04J13/02 , H04L7/00
CPC分类号： H04J13/00 , H04B1/7085 , H04B1/7103 , H04J3/0682 , H04B2201/709709 , H04J14/005
摘要： A multipoint-to-point CDMA communication system comprises a plurality of CDMA transmitting stations and a single CDMA receiving station, all of which are intercoupled to each other over one CDMA channel and one feedback channel. On the one CDMA channel, the plurality of CDMA transmitting stations simultaneously send respective CDMA signals to the receiving station. In the receiving station, respective time differences are measured between a reference clock signal and the spreading codes in the CDMA signals from each of the CDMA transmitting stations; and these time differences are indicated in respective error signals which the CDMA receiving station sends on the feedback channel to each of the CDMA transmitting stations. Each CDMA station responds to its error signals by time shifting its spreading code such that it arrives in the receiving station in synchronization with the reference clock signal. This synchronization enables interference between the spreading codes at the receiving station to be reduced by using codes which have minimal cross-correlation when their time difference is zero; and consequently, the maximum number of stations that can simultaneously transmit is increased.
摘要翻译： 多点对点CDMA通信系统包括多个CDMA发射站和单个CDMA接收站，它们都通过一个CDMA信道和一个反馈信道相互耦合。 在一个CDMA信道上，多个CDMA发送站同时向接收站发送各自的CDMA信号。 在接收站中，在来自每个CDMA发射站的CDMA信号中的参考时钟信号和扩展码之间测量各自的时间差; 并且这些时间差在CDMA接收站在反馈信道上向每个CDMA发射站发送的各个误差信号中指示。 每个CDMA站通过对其扩展码进行时移来响应其误差信号，使得它们与参考时钟信号同步地到达接收站。 该同步使得当它们的时间差为零时，通过使用具有最小互相关的代码来减少接收站处的扩展码之间的干扰; 因此，可以同时发送的站的最大数量增加。
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