公开(公告)号：US5384793A

公开(公告)日：1995-01-24

申请号：US826944

申请日：1992-01-28

申请人： Richard L. Zinser

发明人： Richard L. Zinser

IPC分类号： G11B20/18 ,  H04B1/66 ,  H04L1/08

CPC分类号： G11B20/1803 ,  H04B1/667 ,  H04L1/08

摘要： A method for correcting random errors, and detecting and replacing fading errors in radio frequency (RF) digital transmissions, such as voice transmission. In a Dynamic Bit Allocation Sub-Band Coder (DBASBC), bits corresponding to sub-band energy levels are protected before transmission. In the received signal, errors in the protected bits are corrected at the bit level using a correction algorithm. Where this correction algorithm fails, the failure is detected and an estimated energy value is synthetically regenerated for the corrupted energy value.

摘要翻译： 一种用于校正随机误差以及检测和替换诸如语音传输的射频（RF）数字传输中的衰落误差的方法。 在动态位分配子带编码器（DBASBC）中，对应于子带能级的位在传输之前被保护。 在接收到的信号中，使用校正算法在位电平校正受保护位中的错误。 在这种校正算法失败的情况下，检测到故障，并且对于损坏的能量值综合地再生估计的能量值。

公开(公告)号：US5377183A

公开(公告)日：1994-12-27

申请号：US226470

申请日：1994-04-11

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/26 ,  H04W68/00 ,  H04B7/216

CPC分类号： H04W68/00 ,  H04B7/2628 ,  Y02B60/50

摘要： A Code Division Multiple Access (CDMA) communication system which contains a calling channel which is used to inform silent mobiles that they are being called. In the system, the calling channel is chosen to be the strongest overlapping signal so that it reaches mobiles which are located on the cells extreme boundaries. The interference other signals experience because they overlap with the calling channel may be avoided by having the mobiles first demodulate the calling channel signal and then subtract it out before demodulating their own signal.

摘要翻译： 一种码分多址（CDMA）通信系统，其包括用于通知静默移动台他们正被呼叫的呼叫信道。 在该系统中，主叫信道被选择为最强的重叠信号，使其到达位于小区极限边界的移动台。 通过使移动台首先对呼叫信道信号进行解调，然后在解调其自己的信号之前将其减去，可以避免其他信号遇到的与呼叫信道重叠的干扰。

公开(公告)号：US5353352A

公开(公告)日：1994-10-04

申请号：US866865

申请日：1992-04-10

申请人： Paul W. Dent ,  Gregory E. Bottomley

发明人： Paul W. Dent ,  Gregory E. Bottomley

IPC分类号： H04Q7/38 ,  H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04L1/00 ,  H04L9/00 ,  H04K1/00

CPC分类号： H04L1/0057 ,  H04B1/707 ,  H04J13/0048 ,  H04L9/00 ,  H04L2209/04 ,  H04L2209/34

摘要： Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation properties. The set of scrambling masks is selected such that the correlation between the modulo-2 sum of two masks with any codeword in the block code is a constant magnitude, independent of the mask set and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scrambling masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.

摘要翻译： 对具有公共块纠错码编码的个别信息信号被分配从具有所选相关特性的一组加扰掩码中获得的唯一加密掩码或签名序列。 选择这组加扰掩码，使得两个掩模的模2之和与块码中的任何码字之间的相关性是恒定的幅度，与掩模集合和被比较的各个掩码无关。 在一个实施例中，当使用模2算术对任何两个掩模求和时，该和的沃尔什变换导致最大平均沃尔什频谱。 对于使用减法CDMA解调技术的蜂窝无线电话系统，双层加密系统通过使用伪随机生成的代码密钥来选择蜂窝系统级别中的安全性，以选择特定小区中所有移动台公共的加扰掩码之一。 此外，通过在加扰操作之前使用伪随机生成的加密密钥来加密各个信息信号来确保个人移动用户级别的隐私。

公开(公告)号：US5331666A

公开(公告)日：1994-07-19

申请号：US894933

申请日：1992-06-08

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/005 ,  H04L25/03 ,  H03D1/00 ,  G06F11/10 ,  H03M13/12 ,  H04L27/06

CPC分类号： H04B7/005 ,  H04L25/03184

摘要： An adaptive maximum likelihood demodulator for demodulating digital radio signals on a channel which contains impairments like inter-symbol interference, frequency errors or distortion, that vary with time. The demodulator does not employ channel models to generate signal predictions but rather directly updates the signal predictions for each state without going through the intermediate step of updating a channel model.

摘要翻译： 一种用于解调信道上的数字无线电信号的自适应最大似然解调器，该信道包含诸如符号间干扰，频率误差或失真等随时间变化的损伤。 解调器不使用信道模型来产生信号预测，而是直接更新每个状态的信号预测，而不经历更新信道模型的中间步骤。

公开(公告)号：US5327580A

公开(公告)日：1994-07-05

申请号：US70030

申请日：1993-06-01

申请人： Claude L. Vignali ,  John R. Martin ,  Rodney L. Nickel ,  Daniel I. Schwed

发明人： Claude L. Vignali ,  John R. Martin ,  Rodney L. Nickel ,  Daniel I. Schwed

IPC分类号： H04B1/40 ,  H04B7/24 ,  H04B7/15

CPC分类号： H04B1/40 ,  H04B7/24

摘要： A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being devoted to CTCSS encode, and another microcomputer interrupt service routine being devoted to CTCSS decode). Such encoding and decoding of CTCSS signalling is accomplished using minimal external control hardware (e.g., two flip flops and an inexpensive conventional multipurpose counter/timer chip). The resulting arrangement is inexpensive, reliable and requires only a few components in addition to the appropriately programmed microcomputer in order to provide simultaneous encoding and decoding of CTCSS signals in a full duplex RF transceiver context.

摘要翻译： 双工RF收发器中的微型计算机以中断驱动的方式工作，以同时编码和解码CTCSS信令（一个专用于CTCSS编码的一个微计算机中断服务程序，另一个专用于CTCSS解码的微计算机中断服务程序）。 使用最小的外部控制硬件（例如，两个触发器和廉价的常规多用途计数器/定时器芯片）来实现CTCSS信令的这种编码和解码。 所得到的布置是廉价的，可靠的，并且除了适当编程的微计算机之外仅需要少量组件，以便在全双工RF收发器环境中提供CTCSS信号的同时编码和解码。

公开(公告)号：USD347426S

公开(公告)日：1994-05-31

申请号：US917449

申请日：1992-07-23

申请人： Richard Culbertson ,  Steven L. Sands ,  Ralph R. Sherman

设计人： Richard Culbertson ,  Steven L. Sands ,  Ralph R. Sherman

公开(公告)号：US5305349A

公开(公告)日：1994-04-19

申请号：US54028

申请日：1993-04-29

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/22 ,  H04B1/7107 ,  H04B1/712 ,  H04L27/30

CPC分类号： H04B1/7107 ,  H04B1/712

摘要： An implementation of coherent diversity combining in a RAKE receiver that uses energy in signal echoes by integrating information from main-path and bit-period-delayed signal propagation paths to remove echo distortion, or time dispersion, is described. If delayed by one chip in a CDMA system, such echoes appear as uncorrelated interference. The RAKE receiver correlates a despreading code with the current (main-path) signal samples and with the signal samples delayed by 1, 2, 4, . . . bit periods, and combines the correlation results to determine the information content of the signal. After appropriate conditioning, the received signal is digitized and the signal samples are stored. Groups of samples are Fast Walsh Transformed, and the real and imaginary transforms are scaled according to a table of coefficients; the scaled results are stored. Weighted, scaled transforms of groups shifted by 1, 2, 4, . . . samples are accumulated, and the index of the largest-magnitude accumulation is used to select real and imaginary transform values. The selected values are transferred to a RAKE coefficient computer and quantizer that determines from the sequence of values presented the mean value and trend of the real and imaginary components. A Kalman filter may use these values to estimate the values that will occur during the next group analysis period.

摘要翻译： 描述了通过对来自主路径和位周期延迟的信号传播路径的信息进行积分以消除回波失真或时间色散的，在使用信号回波中的能量的RAKE接收机中组合相干分集的实现。 如果在CDMA系统中延迟了一个芯片，则这种回波出现为不相干的干扰。 RAKE接收器将解扩码与当前（主路径）信号采样相关联，并将信号采样延迟了1,2,4。 。 。 并且将相关结果组合以确定信号的信息内容。 在适当调节之后，接收到的信号被数字化并且存储信号样本。 样本组是快速沃尔什变换，并且根据系数表对真实和虚拟变换进行缩放; 缩放的结果被存储。 加权，按比例变换的组移动了1,2,4。 。 。 样本被累积，最大幅度累积的索引用于选择实数和虚变换值。 所选择的值被传送到RAKE系数计算机和量化器，其根据值序列确定实部和虚部的平均值和趋势。 卡尔曼滤波器可以使用这些值来估计在下一组分析期间将发生的值。

公开(公告)号：US5304947A

公开(公告)日：1994-04-19

申请号：US30725

申请日：1993-03-12

申请人： John T. Carlsson

发明人： John T. Carlsson

IPC分类号： H04B1/04 ,  H03F1/30 ,  H03G3/20 ,  H04B7/26 ,  H03G3/30

CPC分类号： H03G3/3047 ,  H03F1/303

摘要： A high frequency power amplifier amplifies periodic signals in the form of HF bursts. The power output of the amplifier is adjusted by a control loop which produces a control signal in response to a comparison made between a set-point value (BV) and the actual power output (Put) of the amplifier and applies the signal to the power amplifier. The control loop includes a differential amplifier. A correction circuit measures the output voltage of the differential amplifier over a time period (t.sub.1 to t.sub.2) prior to each HF burst and stores in a memory (C) a magnitude proportional to this output voltage. During the following HF burst, this magnitude is used to introduce into the control loop a correction magnitude (Ukorr) for correction of offset voltages (Uoff) occurring in the control loop.

摘要翻译： 高频功率放大器以HF脉冲串的形式放大周期信号。 放大器的功率输出由控制回路调节，该控制回路根据放大器的设定值（BV）和实际功率输出（Put）之间的比较产生控制信号，并将该信号施加到功率 放大器 控制回路包括差分放大器。 校正电路在每个HF突发之前的时间段（t1至t2）内测量差分放大器的输出电压，并将其存储在与该输出电压成比例的存储器（C）中。 在以下HF突发期间，该幅度用于将控制回路中发生的偏移电压（Uoff）的校正量值（Ukorr）引入到控制回路中。

公开(公告)号：US5274882A

公开(公告)日：1994-01-04

申请号：US845184

申请日：1992-03-03

申请人： Per-Hakan Persson

发明人： Per-Hakan Persson

IPC分类号： E05D11/10 ,  E05F1/06 ,  E05F1/12 ,  H04M1/02 ,  E05D7/10

CPC分类号： H04M1/0216 ,  E05D11/1078 ,  E05F1/061 ,  E05F1/1223 ,  E05Y2900/606 ,  Y10T16/527 ,  Y10T16/5357 ,  Y10T16/5387 ,  Y10T16/540254 ,  Y10T16/54035 ,  Y10T16/557

摘要： In a hinge mechanism, a first hinge portion and a second hinge portion are urged toward predetermined angular relationships relative to one another. A force, directed outwardly from the first hinge portion, is applied by an axle pivotally connecting the first and second hinge portions and having a V-shaped tip against a V-shaped groove in the second hinge portion, urging the V-shaped tip and groove to engage. In addition to being urged toward predetermined angular relationships, the first and second hinge portions are kept in predetermined angular relationships until a torsional force is applied to one of the hinge portions to overcome forces keeping the V-shaped tip and groove in engagement.

摘要翻译： 在铰链机构中，第一铰链部分和第二铰链部分相对于彼此被推向预定的角度关系。 从第一铰链部分向外引导的力通过枢转地连接第一和第二铰链部分并且具有V形尖端的轴抵靠第二铰链部分中的V形槽施加，推动V形尖端和 沟槽搞定 除了被推向预定的角度关系之外，第一和第二铰链部分保持预定的角度关系，直到向其中一个铰链部分施加扭转力以克服维持V形尖端和凹槽啮合的力。

公开(公告)号：US5274838A

公开(公告)日：1993-12-28

申请号：US913906

申请日：1992-07-16

申请人： Jeffrey S. Childress ,  Houston H. Hughes, III

发明人： Jeffrey S. Childress ,  Houston H. Hughes, III

IPC分类号： H04L1/16 ,  H04W84/08 ,  H04B1/60

CPC分类号： H04W84/08 ,  H04L1/1614

摘要： A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During normal system operations, a primary site controller performs most or all system control functions while signal processing functions are performed in a distributed manner by trunking cards associated with individual repeater channel receivers and transmitters. In the event the site controller fails, the trunking cards also begin performing trunking and other control functions. The trunking cards cease attempting to communicate with the failed site controller, and begin communicating directly with one another via a high speed backup serial link. Through the distributed processing routines performed by the various trunking cards and interaction between the trunking cards over the backup serial link, trunking and other capabilities are maintained even though the primary site controller has failed (although advanced features such as call logging and the like are lost). Because trunking capability is maintained, failure of the primary site controller has little or no effect on ongoing communications and is virtually transparent to mobile unit operators.

摘要翻译： 用于集群无线电频率通信系统的站点架构提供比包括冗余硬件的架构可用的更好的容错功能。 在正常系统操作期间，主站点控制器执行大部分或所有系统控制功能，同时通过与各个中继器信道接收机和发射机相关联的中继卡以分布式方式执行信号处理功能。 如果站点控制器发生故障，集群卡也将开始执行中继和其他控制功能。 中继卡停止尝试与故障站点控制器进行通信，并通过高速备份串行链路直接相互通信。 通过各种中继卡执行的分布式处理程序以及通过备用串行链路进行的中继卡之间的交互，即使主站点控制器出现故障（尽管诸如呼叫记录等的高级功能丢失）仍能维护中继和其他功能 ）。 由于中继能力得到维护，主站点控制器的故障对正在进行的通信几乎没有影响，对于移动单元运营商实际上是透明的。