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公开(公告)号：US5559788A
公开(公告)日：1996-09-24
申请号：US366198
申请日：1994-12-29
CPC分类号： H04J13/00 , H04J13/0022 , H04J13/10
摘要： A transmitter is provided which simultaneously transmits waveforms such as with different data rates. These transmissions are modulated (e.g. phase modulated) onto quadrature channels of a common carrier, and are then combined. The resulting composite modulated waveform is upconverted to RF, power amplified, split and routed to separate ports for transmission. The transmitted signals are then received, downconverted and demodulated to produce the original signals.
摘要翻译： 提供了一种发送器，它同时发送不同数据速率的波形。 这些传输被调制（例如，相位调制）到公共载波的正交信道上，然后被组合。 所得到的复合调制波形上变频到RF，功率放大，分离和路由到分离端口进行传输。 然后发送的信号被接收，下变频和解调以产生原始信号。
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公开(公告)号：US5696789A
公开(公告)日：1997-12-09
申请号：US399274
申请日：1995-03-06
CPC分类号： H04B1/707
摘要： A novel code division multiple access (CDMA) system and apparatus is provided which permits a plurality of encoded modulated data messages to be transmitted simultaneously on the same channel in one frequency band as a composite CDMA signal. An identification signal is generated and spread by a spreading signal having a duty cycle less than fifty percent to produce a combined signal which is transmitted to a receiver having a tapped delay with a plurality of taps each of which produce a replica of the received combined signal delayed by an odd multiple of the duty cycle of the spreading signal. Each of the replica signals is multiplied by a predetermined weighted value to produce weighted delayed signals and a controller responsive to the received combined signal, is employed for controlling individual weighted delayed signals which are then combined to suppress the spreading signal leaving the identification signal.
摘要翻译： 提供了一种新颖的码分多址（CDMA）系统和装置，其允许在作为复合CDMA信号的一个频带中的同一信道上同时发送多个编码调制数据消息。 通过占空比小于百分之五十的扩展信号产生并扩展识别信号，以产生组合信号，该组合信号被发送到具有抽头延迟的接收机，多个抽头每个抽头产生接收到的组合信号的副本 延迟了扩展信号占空比的奇数倍。 将每个复制信号乘以预定的加权值以产生加权的延迟信号，并且响应于接收到的组合信号的控制器被用于控制然后被组合的各个加权延迟信号，以抑制离开识别信号的扩展信号。
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公开(公告)号：US5724340A
公开(公告)日：1998-03-03
申请号：US382738
申请日：1995-02-02
CPC分类号： H04J13/00 , H04J7/00 , H04J13/0077
摘要： Apparatus and method are provided for adaptively modulating or combining a first signal with a second signal. A series of values of the first signal are taken and sequentially stored in a shift register. The maximum absolute value of the oldest N values (where N is an integer) stored in the shift register is then determined. Before, during or after that determination, the maximum absolute value of the remaining (newer) series of values of the shift register is also determined. The lesser of those two maximum absolute values is then determined. This lesser maximum absolute value is then multiplied by a gain factor representing the desired gain to produce a scale factor. The gain factor can be a preset constant, or can be based on the steady-state ratio of the power of the second signal to the power of the first signal. The second signal is then multiplied by the scale factor to produce a scaled signal. Meanwhile, the first signal has been delayed by an amount representative of the total time duration of the first N values in the shift register, or of the total time needed to obtain those first N values, or of the duration of the portion of the signal represented by those first N values. Considering the two peaks separately, combined with using this delay, in effect enables the resulting amplitude tracking to consider prospective as well as past values of the first signal. The scaled signal is then added to the delayed first signal. The amplitude of the scaled second signal thereby tracks the amplitude of the corresponding portion of the first signal, so that the scaled second signal cannot be readily detected unaided during any relatively low amplitude portion of the first signal.
摘要翻译： 提供了用于自适应地调制或组合第一信号与第二信号的装置和方法。 取第一个信号的一系列值并顺序地存储在移位寄存器中。 然后确定存储在移位寄存器中的最旧的N个值（其中N是整数）的最大绝对值。 在该确定之前，期间或之后，还确定移位寄存器的剩余（较新）系列值的最大绝对值。 然后确定那两个最大绝对值中较小的值。 然后将较小的最大绝对值乘以表示期望增益的增益因子，以产生比例因子。 增益因子可以是预设常数，或者可以基于第二信号的功率与第一信号的功率的稳态比。 然后将第二信号乘以比例因子以产生缩放信号。 同时，第一信号被延迟了代表移位寄存器中的前N个值的总持续时间的量，或者获得这些前N个值所需的总时间，或信号部分的持续时间 由前N个值表示。 考虑到两个峰值分开，结合使用该延迟，实际上使得所得到的幅度跟踪可以考虑第一信号的预期以及过去的值。 然后将缩放的信号添加到延迟的第一信号。 缩放的第二信号的幅度从而跟踪第一信号的对应部分的幅度，使得在第一信号的任何相对较低的振幅部分期间不能容易地检测到缩放的第二信号被无偿地检测。
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4.发明授权
公开(公告)号：US5598154A
公开(公告)日：1997-01-28
申请号：US348669
申请日：1994-12-02
CPC分类号： H04B1/707 , H04J13/0022 , H04J13/10
摘要： A set of independent pseudonoise (PN) component codes greater than two are combined in a manner which produces one or more I and Q uncorrelated orthogonal pairs of resulting combined PN sequences. At least two of the component codes in a resulting combined PN sequence are combined in a manner which produces an overall imbalance of ones and zeros in the binary expression of the resulting combined PN sequence so that the resulting composite code has a partial correlation with a predetermined one of the PN component codes. In the preferred embodiment, three component codes are combined to produce uncorrelated orthogonal pairs of composite codes wherein at least one of the pairs of composite codes is produced to have a partial correlation with one or more of the component codes.
摘要翻译： 大于2的独立伪噪声（PN）分量码的集合以产生所得到的组合PN序列的一个或多个I和Q不相关的正交对的方式组合。 所得到的组合PN序列中的至少两个分量代码以产生组合PN序列的二进制表达式中产生1和0的整体不平衡的方式组合，使得所得到的合成代码与预定的 一个PN组件代码。 在优选实施例中，组合三个分量代码以产生不相关的复合码正交对，其中产生所述复合码对中的至少一个与部分码中的一个或多个部分相关。
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公开(公告)号：US5231400A
公开(公告)日：1993-07-27
申请号：US883621
申请日：1992-05-12
IPC分类号： G01S13/78
CPC分类号： G01S13/782
摘要： An electronic identification system for use by vehicles on a battlefield comprises an interrogator circuit in an attack vehicle and a transponder circuit in several other vehicles which are friendly but could be mistaken for the enemy. In operation, the interrogator circuit transmits a time shifted code which is very difficult for an actual enemy to detect and/or jam, and which causes the transponder circuits to send a response from only a selected one of the other friendly vehicles that is being examined by the attack vehicle as a target.
摘要翻译： 用于战场上的车辆的电子识别系统包括攻击车辆中的询问器电路和其他若干其他车辆中的应答器电路，这些车辆是友好的，但可能被误认为是敌人。 在操作中，询问器电路传输对于实际的敌人难以检测和/或阻塞的时移代码，并且这使得应答器电路仅从正被检查的其他友好车辆中选择的一个发送响应 以攻击车为目标。
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