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1.发明授权
公开(公告)号：US5982812A
公开(公告)日：1999-11-09
申请号：US856257
申请日：1997-05-14
CPC分类号： H03L7/095 , H03L7/18 , H04L27/0014 , H04L2027/0016
摘要： A frequency synthesizer circuit comprises a controller, a synthesizer and a voltage controlled oscillator are used to generate an oscillating signal in response to external commands. The synthesizer provides a lock detect signal to the controller when the synthesizer detects that the oscillating signal has reached a desired frequency following application of a load signal. A first timer, a second timer, and a counter are adapted to receive the load signal and the lock detect signal. The first timer provides a first measurement corresponding to an amount of time between the load signal and a first receipt of the lock detect signal. The second timer provides a second measurement corresponding to an amount of time between the load signal and a final receipt of the lock detect signal. The counter provides a count value corresponding to a total number of times that the lock detect signal is received inclusive of the first receipt and the final receipt of the lock detect signal. A memory device is coupled to each of the first timer, second timer, and counter, which has a data storage portion for storing the first measurement, second measurement and count value.
摘要翻译： 包括控制器，合成器和压控振荡器的频率合成器电路用于响应于外部命令产生振荡信号。 当合成器在施加负载信号后检测到振荡信号达到期望的频率时，合成器向控制器提供锁定检测信号。 第一定时器，第二定时器和计数器适于接收负载信号和锁定检测信号。 第一定时器提供对应于负载信号和锁定检测信号的第一次接收之间的时间量的第一测量。 第二定时器提供对应于负载信号和锁定检测信号的最终接收之间的时间量的第二测量。 计数器提供对应于接收到锁定检测信号的总次数的计数值，包括第一次接收和锁定检测信号的最终接收。 存储器件耦合到第一定时器，第二定时器和计数器中的每一个，其具有用于存储第一测量值，第二测量值和计数值的数据存储部分。
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2.发明授权RF receiver having frequency-hopping/direct-sequence spread spectrum signal discrimination 失效RF接收机具有跳频/直接序列扩频信号鉴别公开(公告)号：US06320896B1
公开(公告)日：2001-11-20
申请号：US09115286
申请日：1998-07-14
IPC分类号： H04B1707
CPC分类号： H04B1/71 , H04B1/69 , H04B1/692 , H04B1/715 , H04B2001/7152
摘要： A receiver is provided for use in an environment in which both frequency-hopping and direct-sequence spread spectrum radio frequency (RF) signals are present. The receiver includes a receive section adapted to receive and downconvert RF input signals. A detector is coupled to the receive section, and has a plurality of parallel filter stages with each tuned for a distinct frequency band. A discriminator compares the RF energy level passing through each of the filter stages to determine whether the RF input signals are frequency-hopping or direct-sequence spread spectrum signals. A controller is adapted to control the receive section in response to the discriminator.
摘要翻译： 提供接收机用于其中存在跳频和直接序列扩频射频（RF）信号的环境。 接收机包括适于接收和下变频RF输入信号的接收部分。 检测器耦合到接收部分，并且具有多个并行滤波器级，每个滤波器级被调谐到不同的频带。 鉴别器比较通过每个滤波器级的RF能量水平，以确定RF输入信号是跳频还是直接序列扩频信号。 控制器适于响应于鉴别器来控制接收部分。
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3.发明授权RF narrowband/wideband discriminating system for spread spectrum signal differentiation 失效用于扩频信号分化的RF窄带/宽带鉴别系统公开(公告)号：US06327312B1
公开(公告)日：2001-12-04
申请号：US09103422
申请日：1998-06-24
IPC分类号： H04L2706
CPC分类号： H04L27/0012
摘要： A radio receiver discriminates between narrowband and wideband radio frequency (RF) signals on the basis of the rate of increase of the integrated energy level of the received signal. The receiver comprises a receive section adapted to receive and downconvert RF input signals to intermediate frequency (IF) signals, and a received signal strength indicator coupled to the receive section and providing a receiver energy signal corresponding to the energy of the IF signals. A discrimination section receives the energy signal, and determines whether the RF input signals are narrowband or wideband by detecting the rate of increase of the integrated level of the receiver energy signal. The discrimination section further comprises a first threshold detector providing a first triggering signal upon the integrated level of the receiver energy signal reaching a first level, a second threshold detector providing a second triggering signal upon the integrated level of the receiver energy signal reaching a second level, and a timer providing a timing signal corresponding to elapsed time between the first and second triggering signal. The RF input signals comprise wideband signals when the timing signal is less than a predetermined value, and narrowband signals when the timing signal is at least equal to the predetermined value.
摘要翻译： 无线电接收机基于接收信号的积分能级的增加速率来区分窄带和宽带射频（RF）信号。 接收机包括适于接收和下变频RF输入信号到中频（IF）信号的接收部分，以及耦合到接收部分的接收信号强度指示符，并提供对应于IF信号的能量的接收机能量信号。 识别部分接收能量信号，并且通过检测接收机能量信号的积分电平的增加率来确定RF输入信号是窄带还是宽带。 鉴别部分还包括第一阈值检测器，在接收器能量信号的集成电平达到第一电平时提供第一触发信号;第二阈值检测器，在接收器能量信号的集成电平达到第二电平时提供第二触发信号 以及定时器，提供与第一和第二触发信号之间经过的时间相对应的定时信号。 当定时信号小于预定值时，RF输入信号包括宽带信号，当定时信号至少等于预定值时，窄带信号。
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4.发明授权Windowed digital matched filter circuit for power reduction in battery-powered CDMA radios 失效用于电池供电的CDMA无线电中的功率降低的窗口数字匹配滤波器电路
公开(公告)号：US6075807A
公开(公告)日：2000-06-13
申请号：US826347
申请日：1997-03-25
IPC分类号： H04B1/7093 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/7093
摘要： A digital matched filter for a CDMA radio comprises a digital delay line having a plurality of successive delay stages adapted to receive a digital signal and propagate the digital signal therethrough at a fixed rate. A correlator is coupled to the digital delay line to correlate the digital signal to a predefined spreading code to provide a correlation signal representing a degree of correlation of the digital signal to the spreading code. A window logic unit is coupled to the correlator to enable operation of the correlator only during successive discrete time periods of the correlation signal corresponding to a high degree of correlation of the digital signal to the spreading code.
摘要翻译： 用于CDMA无线电的数字匹配滤波器包括数字延迟线，其具有适于接收数字信号并以固定速率传播数字信号的多个连续的延迟级。 相关器耦合到数字延迟线，以将数字信号与预定义的扩展码相关联，以提供表示数字信号与扩展码相关程度的相关信号。 窗口逻辑单元耦合到相关器，以便仅在相应信号的连续离散时间段期间相关器的操作才能使数字信号与扩展码的高度相关。
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5.发明授权Adaptive power leveling of an RF transceiver utilizing information stored in non-volatile memory 失效利用存储在非易失性存储器中的信息，RF收发器的自适应功率调平
公开(公告)号：US6009119A
公开(公告)日：1999-12-28
申请号：US823611
申请日：1997-03-25
CPC分类号： H04W52/30 , H03F1/34 , H04W52/52 , H04B2001/0433
摘要： A radio frequency (RF) transceiver adaptively maintains power output level linearity across a broad spectrum of transmitting frequencies. The RF transceiver comprises a frequency synthesizer adapted to modulate an information signal across a plurality of distinct channels and an amplifier adapted to amplify the modulated information signal to a desired power level for transmission as an RF signal. The transceiver includes a table of offset values having individual entries corresponding to each of the distinct channels. A portion of the amplified and modulated information signal is sampled to provide binary values corresponding to instantaneous power levels of the transceiver. The offset values are calculated by comparing the sampled binary values to optimal binary values. Thereafter, an amount of amplification provided by the amplifier for an associated one of the channels is controlled in accordance with a corresponding one of the offset values from the table.
摘要翻译： 射频（RF）收发器在广泛的发射频率上自适应地维持功率输出电平线性度。 RF收发器包括适于调制跨多个不同通道的信息信号的频率合成器和适于将经调制的信号信号放大到期望功率电平以用于作为RF信号进行传输的放大器。 收发器包括具有对应于每个不同信道的各个条目的偏移值表。 被放大和调制的信息信号的一部分被采样以提供对应于收发器的瞬时功率电平的二进制值。 通过将采样的二进制值与最佳二进制值进行比较来计算偏移值。 此后，根据来自该表的偏移值的对应的一个来控制由放大器为相关联的一个信道提供的放大量。
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6.发明授权Methodology for discontinuous radio reception utilizing embedded frame length words 失效使用嵌入式帧长度字的不连续无线电接收方法
公开(公告)号：US6005885A
公开(公告)日：1999-12-21
申请号：US570982
申请日：1995-12-12
IPC分类号： H04B1/707
CPC分类号： H04B1/707
摘要： A radio receiver for direct sequence spread spectrum radio frequency (RF) signals is provided which discontinues radio reception when it is recognized that a received signal is intended for another such receiver. As a result, the receiving apparatus draws substantially less electrical current than conventional spread spectrum receivers. The apparatus provides for demodulation of an RF signal to recover digital information in the form of a transmitted message packet having a header portion and a data portion. The apparatus determines a message address and data length from the header portion. If the determined address does not correspond to the distinct apparatus address of the particular receiver, the apparatus disables the signal demodulation operation for a discrete period of time corresponding to the determined data length.
摘要翻译： 提供了一种用于直接序列扩频射频（RF）信号的无线电接收机，当识别出接收到的信号用于另一个这样的接收机时，其停止无线电接收。 结果，与传统的扩频接收机相比，接收设备的电流大大减少。 该装置提供RF信号的解调以以具有标题部分和数据部分的传输消息分组的形式恢复数字信息。 该装置从报头部分确定消息地址和数据长度。 如果所确定的地址不对应于特定接收机的不同装置地址，则装置在对应于确定的数据长度的离散时间段内禁止信号解调操作。
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公开(公告)号：US6005530A
公开(公告)日：1999-12-21
申请号：US961959
申请日：1997-10-31
摘要： A switched gain antenna array comprising a plurality of dipole elements disposed in series with a phasing stub coupled between adjacent ones of the dipole elements. An antenna feed line is coupled to a first one of the dipole elements to couple the RF signals into and out of the plurality of dipole elements. The phasing stubs are adapted to adjust phase of the RF signals provided to each of the dipole elements so that the dipole elements operate in phase. A switch is disposed between the first one of the dipole elements and a second one of the dipole elements. The switch is adapted to disconnect the first one of the dipole elements from remaining ones of the dipole elements during transmit operations of the antenna array and to connect each of the dipole elements together during receive operations of the antenna array. As a result, the antenna array has greater gain during receive operations than during transmit operations.
摘要翻译： 一种开关增益天线阵列，包括与耦合在相邻偶极子元件之间的相位短柱串联设置的多个偶极子元件。 天线馈电线耦合到偶极元件中的第一个，以将RF信号耦合到多个偶极子元件中和从多个偶极元件中抽出。 相位桩适于调整提供给每个偶极元件的RF信号的相位，使得偶极子元件同相工作。 开关设置在第一个偶极子元件和第二个偶极子元件之间。 开关适于在天线阵列的发射操作期间将偶极子中的第一个偶极子元件与剩余的偶极元件断开，并且在天线阵列的接收操作期间将每个偶极子元件连接在一起。 结果，天线阵列在接收操作期间比在发射操作期间具有更大的增益。
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8.发明授权Multiple-rate direct sequence architecture utilizing a fixed chipping rate and variable spreading code lengths 失效利用固定码片速率和可变扩展码长度的多速率直接序列架构
公开(公告)号：US5946344A
公开(公告)日：1999-08-31
申请号：US826777
申请日：1997-04-07
IPC分类号： H03H17/02 , H04B1/7093 , H04B15/00
CPC分类号： H04B1/7093
摘要： A spread spectrum communication system is provided in which a receiver is adapted to despread multi-bit digital signals transmitted with a fixed chipping rate using two or more different spreading code lengths. As a result, a longer spreading code could be utilized to transmit at a lower data rate for conditions in which jamming resistance is more critical, such as over longer distances, and a shorter spreading code could be utilized to transmit at a higher data rate for conditions in which jamming resistance is less critical, such as over shorter distances. The receiver further comprises a digital matched filter adapted to correlate to the two different spreading codes. The digital matched filter comprises a digital delay line having a plurality of successive delay stages that propagate the received digital signal therethrough at a fixed rate corresponding to the chipping rate of the digital signal. A first correlator compares the digital signal to a first spreading code having a length M, and a second correlator compares the digital signal to a second spreading code having a length N, in which N is less than M. A multiplexer is adapted to select an output from one of the two correlators.
摘要翻译： 提供了一种扩展频谱通信系统，其中接收机适于使用两个或多个不同的扩展码长度对以固定码片速率发射的多位数字信号进行解扩。 结果，可以利用较长的扩展码来以较低的数据速率发送干扰电阻更为关键的条件，例如较长的距离，并且较短的扩展码可以用于以更高的数据速率传输，以便 干扰电阻不太重要的条件，例如越来越短的距离。 接收机还包括适于与两个不同扩展码相关联的数字匹配滤波器。 数字匹配滤波器包括具有多个连续延迟级的数字延迟线，其以对应于数字信号的切片速率的固定速率传播所接收的数字信号。 第一相关器将数字信号与具有长度M的第一扩展码进行比较，第二相关器将数字信号与长度为N的第二扩展码进行比较，其中N小于M。多路复用器适于选择 从两个相关器之一输出。
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9.发明授权
公开(公告)号：US5912921A
公开(公告)日：1999-06-15
申请号：US915260
申请日：1997-08-20
摘要： A wireless local area network (WLAN) provides optimal data throughput by operating at multiple data rates simultaneously. The WLAN includes a network master communicating with a plurality of remote client transceiver nodes. The network master maintains a table of active client transceiver nodes. The table includes a current data rate for each of the active client transceiver nodes. Periodic high-speed and low-speed beacon signals are transmitted from the network master to the active client transceiver nodes. Each of the active client transceiver nodes receives and processes the beacon signals to determine an optimal data rate. Then, each of the active client transceiver nodes transmits a return signal to the network master which designates the determined optimal data rate. Thereafter, the network master updates the table to reflect the optimal data rate for each of the active client transceiver nodes. Subsequent messages from the network master to the active client transceiver nodes are thereby transmitted at the current data rate for each respective one of the active client transceiver nodes.
摘要翻译： 无线局域网（WLAN）通过同时以多个数据速率运行来提供最佳数据吞吐量。 WLAN包括与多个远程客户端收发器节点通信的网络主机。 网络主机维护活动客户端收发器节点的表。 该表包括每个活动客户端收发器节点的当前数据速率。 定期的高速和低速信标信号从网络主机传输到主动客户端收发器节点。 每个主动客户端收发器节点接收并处理信标信号以确定最佳数据速率。 然后，每个主动客户端收发器节点向指定所确定的最佳数据速率的网络主机发送返回信号。 此后，网络主机更新表以反映每个活动客户端收发器节点的最佳数据速率。 因此，从网络主设备到活动客户机收发器节点的后续消息由当前数据速率发送到每个相应的一个主动客户机收发器节点。
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10.发明授权Methodology for received signal enhancement utilizing delay diversity processing 失效使用延迟分集处理的接收信号增强方法
公开(公告)号：US6118807A
公开(公告)日：2000-09-12
申请号：US535947
申请日：1995-09-28
IPC分类号： H04B1/7073 , H04B1/7117 , H04N5/225 , A61F2/06 , H04L27/30
CPC分类号： H04B1/7073 , H04B1/7117
摘要： A delay diversity processor for use in receiving direct sequence spread spectrum data utilizes multipath signals to enhance bit synchronization performance by integrating the magnitude of each multipath signal to allow for erratic fluctuations in the multipath signal. As a result, the receiver is less prone to sudden signal strength variation that might trigger erroneous bit resynchronization. The delay diversity processor comprises a first circuit which determines a magnitude value for each of a plurality of correlated signal samples of individual data bits of plural data streams of the received spread spectrum data. A second circuit integrates each of the magnitude values over a period of time corresponding to receipt of a plurality of the individual data bits. The integrated magnitude values provide a measure of confidence of a particular one of the correlated signal samples with respect to remaining ones of the correlated signal samples. The correlated signal sample having the most consistently high measure of confidence is thus most likely to contain reliable and valid data. In an embodiment of the delay diversity processor, the digital delay circuit of the second circuit provides for resetting of the integrated magnitude values within following interruption of receipt of the spread spectrum data. The data values within the digital delay circuit can be reset either to zero, or to a predetermined value. The use of a predetermined value improves the ability of the delay diversity processor to generate valid data following an interruption of the spread spectrum data.
摘要翻译： 用于接收直接序列扩展频谱数据的延迟分集处理器利用多径信号来增强比特同步性能，通过对每个多路径信号的幅度进行积分以允许多径信号中的不稳定波动。 结果，接收机不太容易发生可能触发错误位重新同步的突发信号强度变化。 延迟分集处理器包括第一电路，其确定接收到的扩展频谱数据的多个数据流的各个数据比特的多个相关信号样本中的每一个的幅度值。 第二电路在对应于多个单独数据位的接收的一段时间内对每个幅度值进行积分。 集成的幅度值提供相对于相关信号样本中的特定一个相对于相关信号样本中的剩余信号样本的置信度的量度。 因此，具有最一致的高置信度的相关信号样本最有可能包含可靠且有效的数据。 在延迟分集处理器的实施例中，第二电路的数字延迟电路提供在接收扩展频谱数据的随后中断之前复位积分幅度值。 数字延迟电路内的数据值可以重置为零或预定值。 使用预定值提高延迟分集处理器在扩展频谱数据的中断之后产生有效数据的能力。
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