公开(公告)号：US5504750A

公开(公告)日：1996-04-02

申请号：US283866

申请日：1994-08-01

申请人： Tracy L. Fulghum ,  Jimmy W. Cadd

发明人： Tracy L. Fulghum ,  Jimmy W. Cadd

IPC分类号： H04B1/713 ,  H04J13/00 ,  H04W72/02 ,  H04J3/16 ,  H04J3/06

CPC分类号： H04W72/02 ,  H04B1/713 ,  H04J13/00 ,  H04W24/00 ,  H04W28/26

摘要： A method and apparatus is provided for a operating a radio system (100) on shared communication channels. The system (100) has a sequence of communication channels (205), including a reservation channel, and a channel hopping protocol for operating on the sequence (205). A hop period is defined for the channel hopping protocol. The reservation channel is monitored for at least the channel hop period to find an open communication slot indicated by the absence of a reservation signal (320, 325, 330). Communications is then established within the open slot, and channel hopping occurs through the sequence of communication channels in the open slot (345, 350). The slot is preserved by transmitting a reservation signal on the reservation channel, when operating on the reservation channel (355, 360).

摘要翻译： 提供了一种用于在共享通信信道上操作无线电系统（100）的方法和装置。 系统（100）具有包括预留信道的通信信道序列（205）和用于在序列（205）上操作的信道跳频协议。 为跳频协议定义跳跃周期。 监视预约信道至少频道跳跃周期以找到由不存在预约信号（320,325,330）指示的开放通信时隙。 然后在开放时隙内建立通信，并且通过开放时隙（345,350）中的通信信道序列发生信道跳频。 当在预约信道上操作时，通过在预留信道上发送预约信号来保留时隙（355,360）。

公开(公告)号：US5353300A

公开(公告)日：1994-10-04

申请号：US71879

申请日：1993-06-07

申请人： Edward K. B. Lee ,  Jimmy Cadd ,  Tracy L. Fulghum ,  Robert S. Babayi

发明人： Edward K. B. Lee ,  Jimmy Cadd ,  Tracy L. Fulghum ,  Robert S. Babayi

IPC分类号： H04B1/7097 ,  H04L27/30

CPC分类号： H04B1/7097

摘要： A communication method in an adaptive CDMA communication system (100) capable of communicating a direct sequence spread spectrum communication signals which comprise bit sequences coded with spreading chip sequences. The method includes the steps of transmitting a DS-SS communication signal (30) having a training bit sequence (31) coded with spreading chip sequence. The method includes the step of despreading the DS-SS communication signal based on the training bit sequence (31) during a training interval. The DS-SS communication signals is despread by adaptively determining a despreading chip sequence. Then, following the training interval determining chip timing offset during a chip timing interval. Finally, bit timing offset is determined during a bit timing interval following the chip timing interval.

摘要翻译： 自适应CDMA通信系统（100）中的通信方法，其能够传送包括用扩展码片序列编码的比特序列的直接序列扩频通信信号。 该方法包括以下步骤：发送具有以扩展码片序列编码的训练比特序列（31）的DS-SS通信信号（30）。 该方法包括在训练间隔期间基于训练比特序列（31）解扩DS-SS通信信号的步骤。 通过自适应地确定解扩展码片序列来解扩DS-SS通信信号。 然后，在芯片定时间隔之后的训练间隔确定芯片定时偏移之后。 最后，在码片定时间隔之后的比特定时间隔期间确定比特定时偏移。

公开(公告)号：US08009722B2

公开(公告)日：2011-08-30

申请号：US11954460

申请日：2007-12-12

申请人： Tracy L. Fulghum

发明人： Tracy L. Fulghum

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B1/711 ,  H04B2201/709727

摘要： In a parametric G-Rake receiver, a method an apparatus computes initial estimates of one or more scaling parameters and initial combining weights for the parametric G-Rake receiver; estimates the SINR of a received signal based on a mean pilot symbol estimate and the initial combining weights; computes revised estimates for one or more scaling parameters based on the estimated SINR and the initial combining weights; and computes revised combining weights based on one or more revised scaling parameter estimates.

摘要翻译： 在参数G-Rake接收机中，方法和装置计算参数G-Rake接收机的一个或多个缩放参数和初始组合权重的初始估计; 基于平均导频符号估计和初始组合权重来估计接收信号的SINR; 基于估计的SINR和初始组合权重计算一个或多个缩放参数的修正估计; 并且基于一个或多个修正的缩放参数估计来计算修改的组合权重。

公开(公告)号：US07936839B2

公开(公告)日：2011-05-03

申请号：US12328199

申请日：2008-12-04

申请人： Tracy L. Fulghum

发明人： Tracy L. Fulghum

IPC分类号： H04B7/02

CPC分类号： H04L25/0204 ,  H04B7/0413 ,  H04L25/0214 ,  H04L25/0222 ,  H04L25/0232

摘要： A receive station of the present invention despreads a received signal over multiple successive symbol periods of an extended measurement period to determine individual channel estimates over each symbol period of an extended period for multiple pilot signals. In one example, the extended measurement period comprises two extended periods, each of which comprise two symbol periods. As a result, the present invention provides channel estimates sufficient for both slow and fast fading conditions. The receive station determines a combined channel estimate for the pilot signals over each symbol period of an extended period by despreading the received signal over each symbol period of an extended measurement period using a common spreading sequence. Based on the combined channel estimates, the receive station determines individual channel estimates for each pilot signal over each symbol period of the extended period.

摘要翻译： 本发明的接收站在扩展测量周期的多个连续符号周期上对接收到的信号进行解扩，以确定针对多个导频信号的延长周期的每个符号周期的各个信道估计。 在一个示例中，扩展测量周期包括两个延伸周期，每个延长周期包括两个符号周期。 结果，本发明提供了足够用于慢速和快速衰落条件的信道估计。 接收站通过使用公共扩展序列在扩展测量周期的每个符号周期上解扩接收信号来确定延长时段的每个符号周期上的导频信号的组合信道估计。 基于组合的信道估计，接收站在延长的周期的每个符号周期上确定每个导频信号的各个信道估计。

公开(公告)号：US07486716B2

公开(公告)日：2009-02-03

申请号：US11158665

申请日：2005-06-22

申请人： Tracy L. Fulghum ,  Gregory E. Bottomley

发明人： Tracy L. Fulghum ,  Gregory E. Bottomley

IPC分类号： H04B1/00

CPC分类号： H04B1/712 ,  H04B2201/709727

摘要： A wireless communication receiver obtains improved performance under certain fast fading conditions by basing one or more received signal processing operations on pre-despreading chip sample correlations rather than on post-despreading noise correlations, but preserves soft scaling information by determining one or more scaling factors that relate the chip sample correlations to the noise correlations. By way of non-limiting examples, a Generalized RAKE receiver circuit may base combining weight generation on chip sample correlations rather than on post-despreading pilot symbol noise correlations, but scale the combining weights as a function of the one or more scaling factors, or, equivalently, scale the combined values generated from the combining weights. Similar scaling may be performed with respect to chip equalization filter combining weights in a chip equalization receiver circuit. Further, Signal-to-Interference Ratio (SIR) estimation may be improved in terms of fast fading responsiveness by using chip sample correlations, while preserving the proper scaling.

摘要翻译： 无线通信接收机在某些快速衰落条件下通过将一个或多个接收到的信号处理操作基于预先解扩展芯片样本相关而不是后解扩噪声相关来获得改进的性能，但是通过确定一个或多个缩放因子来保留软缩放信息， 将芯片样本相关性与噪声相关性相关联。 作为非限制性示例，广义RAKE接收机电路可以基于片上样本相关的权重生成而不是去扩展导频符号噪声相关，但是将组合权重缩放为一个或多个缩放因子的函数，或 相等地，缩放从组合权重生成的组合值。 可以针对芯片均衡接收器电路中的码片均衡滤波器组合权重执行类似的缩放。 此外，通过使用芯片样本相关性，在保持适当的缩放的同时，可以在快速衰落响应性方面改善信号干扰比（SIR）估计。

公开(公告)号：US06813322B2

公开(公告)日：2004-11-02

申请号：US09843558

申请日：2001-04-26

申请人： Tracy L. Fulghum ,  Ali S. Khayrallah

发明人： Tracy L. Fulghum ,  Ali S. Khayrallah

IPC分类号： H03D100

CPC分类号： H03M13/4146 ,  H03M13/09 ,  H03M13/3738 ,  H03M13/3776 ,  H03M13/612 ,  H03M13/658 ,  H04L1/0054

摘要： Biasing soft output values based on a known or learned bit error rate function yields performance improvements in decoding algorithms adapted to work with soft values, such as soft output Viterbi algorithms (SOVA). For example, in a wireless receiver, the soft output values output from a signal demodulator may be biased to reflect the changes in bit error rate across a given burst or block of data. Such changes might arise, for example, due to increasing inaccuracies in the receiver's channel estimate, which is typically computed at the beginning or middle of a block of received data. The wireless receiver may store a table of scaling factors corresponding to the expected bit error rate distribution of the received signal. The table may be preloaded into the receiver, or may be determined during operation. In either case, the table may be updated during operation to reflect bit error incidence observed during operation.

摘要翻译： 基于已知或学习的误码率函数对软输出值进行偏移，可以在适用于软值（例如软输出维特比算法（SOVA））的解码算法中提高性能。 例如，在无线接收机中，从信号解调器输出的软输出值可能被偏置以反映给定突发或数据块的误码率的变化。 这种变化可能会出现，例如，由于接收机的信道估计的不准确性增加，这通常在接收数据块的开始或中间计算。 无线接收机可以存储与接收信号的预期误码率分布相对应的缩放因子表。 该表可以预加载到接收器中，或者可以在操作期间确定。 在任一情况下，在操作期间可以更新表以反映在操作期间观察到的位错误发生。

公开(公告)号：US5430775A

公开(公告)日：1995-07-04

申请号：US186938

申请日：1994-01-27

申请人： Tracy L. Fulghum ,  Jimmy W. Cadd

发明人： Tracy L. Fulghum ,  Jimmy W. Cadd

IPC分类号： H04B1/713 ,  H04B7/26 ,  H04J13/00 ,  H04L12/28

CPC分类号： H04B7/2621 ,  H04B1/713 ,  H04J13/0074 ,  H04W24/00 ,  H04W28/18 ,  H04W72/02

摘要： A radio communication system (10) operates over a sequence of communication channels using a synchronized channel hopping protocol. A first communication device (16) is provided which is capable of communicating over the sequence of communication channels using channel hopping, and which has an operating communication channel. A second communication device (13) is provided, which is capable of determining the operating communication channel and channel hopping parameters of the first communication device (16). The second communication device (13) can communicate over the sequence of communication channels using channel hopping synchronized with the channel hopping of the first communication device (16), while selecting an operating communication channel different from the operating communication channel of the first communication device (16) when both communication devices (13, 16) operate simultaneously.

摘要翻译： 无线电通信系统（10）使用同步信道跳频协议在一系列通信信道上操作。 提供第一通信设备（16），其能够通过使用信道跳频的通信信道序列进行通信，并且具有操作通信信道。 提供第二通信设备（13），其能够确定第一通信设备（16）的操作通信信道和信道跳频参数。 第二通信设备（13）可以在选择与第一通信设备的操作通信信道不同的操作通信信道的同时，使用与第一通信设备（16）的信道跳频同步的信道跳频，在通信信道序列上进行通信（ 16）当两个通信设备（13,16）同时操作时。

公开(公告)号：US5317593A

公开(公告)日：1994-05-31

申请号：US25494

申请日：1993-03-03

申请人： Tracy L. Fulghum ,  Edward K. B. Lee ,  Jimmy W. Cadd

发明人： Tracy L. Fulghum ,  Edward K. B. Lee ,  Jimmy W. Cadd

IPC分类号： H04J13/16 ,  H04K1/00

CPC分类号： H04J13/16

摘要： A code division multiple access (CDMA) communication system (10) for reuse of available spreading codes includes a first communication device (100) and a second communication device (106). The first and second communication devices (100, 106) are capable of identifying spreading codes and operating frequencies that are optimum for their respective radios. The identity of the optimum spreading code and the frequency of the optimum frequency is communicated from one communication device (100) to another (106), hence allowing the two devices to communicate with each other using their respective optimum codes and frequencies. These codes and frequencies may be periodically updated to provide reusability of codes. By dynamically updating codes and frequencies without the use of a central station, the efficiency and reusability of codes in the CDMA system (10) is significantly enhanced.

摘要翻译： 用于重用可用扩展码的码分多址（CDMA）通信系统（10）包括第一通信设备（100）和第二通信设备（106）。 第一和第二通信设备（100,106）能够识别对于它们各自的无线电设备是最佳的扩展码和工作频率。 最佳扩展码的标识和最佳频率的频率从一个通信设备（100）传送到另一个（106），从而允许两个设备使用它们各自的最佳代码和频率彼此进行通信。 可以周期性地更新这些代码和频率以提供代码的可重用性。 通过在不使用中心站的情况下动态地更新代码和频率，CDMA系统（10）中的代码的效率和可重用性显着增强。

公开(公告)号：US5297162A

公开(公告)日：1994-03-22

申请号：US73226

申请日：1993-06-04

申请人： Edward K. B. Lee ,  Jimmy Cadd ,  Tracy L. Fulghum ,  Robert S. Babayi

发明人： Edward K. B. Lee ,  Jimmy Cadd ,  Tracy L. Fulghum ,  Robert S. Babayi

IPC分类号： H04B1/7097 ,  H04B7/26 ,  H04J13/00 ,  H04L7/02 ,  H04L7/04 ,  H04L9/00

CPC分类号： H04J13/00 ,  H04B1/7097 ,  H04L7/041 ,  H04L7/046

摘要： In a CDMA communication system (100) capable of communicating between a receiver (20) and a transmitter (10) direct sequence spread spectrum communication signals (30), a system and method for synchronizing receiver bit timing and transmitter timing. Transmitter (10) transmits a training bit sequence (31) followed by a transmitter bit timing sequence (33). The receiver (20) adaptively determines a representation of a despreading chip sequence using a tapped delay line equalizer (400). Receiver bit timing offset is determined based on the representation of the despreading chip sequence and the transmitter bit timing sequence (33).

摘要翻译： 在能够在接收机（20）和发射机（10）之间进行通信的直接序列扩频通信信号（30）的CDMA通信系统（100）中，用于同步接收机比特定时和发射机定时的系统和方法。 发送器（10）发送训练比特序列（31），接着是发送器比特定时序列（33）。 接收器（20）使用抽头延迟线均衡器（400）自适应地确定解扩展码片序列的表示。 基于去扩展码片序列和发射机比特定时序列的表示来确定接收机比特定时偏移（33）。

公开(公告)号：US06778838B1

公开(公告)日：2004-08-17

申请号：US09686518

申请日：2000-10-11

申请人： Rajaram Ramesh ,  Tracy L. Fulghum

发明人： Rajaram Ramesh ,  Tracy L. Fulghum

IPC分类号： H04B1500

CPC分类号： H04W88/085 ,  H04H20/67

摘要： A method of mitigating phase nulls in a local wireless telephone system comprises inserting one or more random bits into a frame of a simulcast signal. The introduction of the random bits into the frame causes subsequent bits in the frame to be modulated differently, thereby reducing phase cancellation nulls. While particularly suited to localized wireless telephone systems, the methodology may be equally adapted to any mobile network wherein geographically proximate antennas broadcast the same signals.

摘要翻译： 一种减轻本地无线电话系统中的相位空值的方法包括将一个或多个随机比特插入到同播信号的帧中。 将随机比特的引入引入到帧中，使帧中的后续比特被不同地调制，从而减少相位消除的零点。 虽然特别适用于本地化的无线电话系统，该方法可以同样适用于任何移动网络，其中地理上邻近的天线广播相同的信号。