公开(公告)号：US07164733B1

公开(公告)日：2007-01-16

申请号：US10273929

申请日：2002-10-17

申请人： Dan M. Griffin ,  Randal R. Sylvester

发明人： Dan M. Griffin ,  Randal R. Sylvester

IPC分类号： H04L27/00

CPC分类号： H04L27/227 ,  H04L2027/003 ,  H04L2027/0055 ,  H04L2027/0067

摘要： A method and system for compensating digital data demodulation phase uncertainty is provided. The method includes the steps of identifying a phase reference quadrant, the phase reference quadrant having a phase reference axis and four quadrants, I, II, III, and IV; receiving known digital data; and forming a phase vector from the known digital data, determining which quadrant the phase vector is located in and rotating the phase vector to the phase reference quadrant if it is determined that the phase vector is not located in the phase reference quadrant. The last step generates a phase error signal proportional to the resulting angle by rotating the phase vector −45° and measuring the resulting angle between the phase vector and the phase reference axis.

摘要翻译： 提供了一种用于补偿数字数据解调相位不确定性的方法和系统。 该方法包括以下步骤：识别相位参考象限，相位参考象限具有相位参考轴和四个象限I，II，III和IV; 接收已知的数字数据; 以及如果确定相位矢量不位于相位参考象限中，则从已知的数字数据形成相位矢量，确定相位矢量所在的象限，并将相位矢量旋转到相位参考象限。 最后一步通过旋转相位矢量-45°并测量相位矢量和相位参考轴之间产生的角度，产生与所得到的角度成比例的相位误差信号。

公开(公告)号：US07126982B1

公开(公告)日：2006-10-24

申请号：US09620888

申请日：2000-07-21

申请人： Steven T. Barham ,  Samuel Kingston ,  Randal R. Sylvester ,  Ronald Leahy

发明人： Steven T. Barham ,  Samuel Kingston ,  Randal R. Sylvester ,  Ronald Leahy

IPC分类号： H04B1/69 ,  H04B1/707 ,  H04B1/713

CPC分类号： H04B1/70751 ,  H04B1/70735 ,  H04B1/7077

摘要： An apparatus and method of determining a signal code. The method comprising steps of acquiring and correlating a signal with a first code sequence. In response to the correlation of the signal with a first code sequence a timing lock is achieved. Also in response to the signal correlation, an acknowledgement from a receiver of the signal to a transmitter of the signal is sent where upon the receiver and transmitter change to a second code sequence.

摘要翻译： 一种确定信号码的装置和方法。 该方法包括以下步骤：获取信号与第一代码序列相关联。 响应于信号与第一代码序列的相关性，实现定时锁定。 同样响应于信号相关，发送信号的接收机对信号的发射机的确认，其中接收机和发射机改变为第二码序列。

公开(公告)号：US06654365B1

公开(公告)日：2003-11-25

申请号：US09256716

申请日：1999-02-24

申请人： Randal R. Sylvester ,  Thomas R. Giallorenzi

发明人： Randal R. Sylvester ,  Thomas R. Giallorenzi

IPC分类号： H04J1300

CPC分类号： H04L25/03331 ,  H04B1/7103 ,  H04L25/0204 ,  H04L25/021 ,  H04L25/0242 ,  H04L25/03184 ,  H04L25/03216 ,  H04L25/0328 ,  H04L25/03299

摘要： A maximum likelihood (ML) detector provides improved performance in the presence of multiple user interference (MUI), particularly performance of a multiuser receiver for asynchronous CDMA. The detector can be implemented using a Viterbi algorithm, this greatly reducing system sensitivity to MUI. An approximation to the ML detector provides a sparse trellis search based on the structure of the ML detector. The resulting detector, which may be referred to as a reduced-complexity recursive detector (RCRD), has a dynamic structure that allows a trade-off between complexity and performance. Use is made of a unique metric to define the trellis-structure and the M-algorithm to reduce the number of surviving paths. The metric calculation is then repeated at decision points to provide soft-decision information for further signal processing, soft-decision decoding of an error-correction code, or iterative reception of the multiuser signal.

摘要翻译： 最大似然（ML）检测器在多用户干扰（MUI）的存在下提供改进的性能，特别是用于异步CDMA的多用户接收机的性能。 检测器可以使用维特比算法实现，大大降低了系统对MUI的敏感度。 ML检测器的近似值提供了基于ML检测器结构的稀疏网格搜索。 所得到的检测器（其可以被称为降低复杂度递归检测器（RCRD））具有允许在复杂度和性能之间进行权衡的动态结构。 使用唯一的度量来定义网格结构和M算法来减少幸存路径的数量。 然后在决策点重复度量计算，以提供用于进一步的信号处理，纠错码的软判决解码或多用户信号的迭代接收的软判决信息。

公开(公告)号：US07539239B2

公开(公告)日：2009-05-26

申请号：US11533509

申请日：2006-09-20

申请人： Steven T. Barham ,  Samuel Kingston ,  Randal R. Sylvester ,  Ronald Leahy

发明人： Steven T. Barham ,  Samuel Kingston ,  Randal R. Sylvester ,  Ronald Leahy

IPC分类号： H04B1/69 ,  H04B1/707 ,  H04B1/713

CPC分类号： H04B1/70751 ,  H04B1/70735 ,  H04B1/7077

摘要： An apparatus and method of determining a signal code. The method comprising steps of acquiring and correlating a signal with a first code sequence. In response to the timing lock is achieved. Also in response to the signal correlation, an acknowledge from a receiver of the signal to a transmitter change to a second code sequence.

摘要翻译： 一种确定信号码的装置和方法。 该方法包括以下步骤：获取信号与第一代码序列相关联。 响应时序锁定实现。 同样响应于信号相关性，来自发射机的信号的接收机的确认变为第二码序列。

公开(公告)号：US07313164B1

公开(公告)日：2007-12-25

申请号：US10675184

申请日：2003-09-30

申请人： Michael L. Wilson ,  Randal R. Sylvester ,  Patricia F. Batzer

发明人： Michael L. Wilson ,  Randal R. Sylvester ,  Patricia F. Batzer

IPC分类号： H04B1/69

CPC分类号： H04B1/7075 ,  H04B1/70735 ,  H04B1/709

摘要： A method and system is disclosed for generating and detecting variable sequence PN codes. PN-Code sequence changes based on varying interceptor threat levels are generated at a rate fast enough to avoid exploitation while maintaining a reasonable correlation search window. The PN code sequence is phase shifted by N-chips based on the severity of the threat environment. A synchronized receiver demodulates the PN encoded signal by correlating over every possible phase of the PN code sequence. The receiver includes first and second correlators and threshold detectors adapted to detect PN signals with varying PN code sequence changes.

摘要翻译： 公开了用于产生和检测可变序列PN码的方法和系统。 基于不同的拦截器威胁级别的PN代码序列变化以足够快的速度产生，以避免利用，同时保持合理的相关搜索窗口。 基于威胁环境的严重性，PN码序列被N码相移。 同步接收机通过将PN码序列的每个可能相位相关联来解调PN编码信号。 该接收机包括第一和第二相关器和阈值检测器，其适于检测具有变化的PN码序列改变的PN信号。

公开(公告)号：US07130333B2

公开(公告)日：2006-10-31

申请号：US09995095

申请日：2001-11-27

申请人： Leroy Andrew Gibson, Jr. ,  Dan M. Griffin ,  Lyman D. Horne ,  Randal R. Sylvester

发明人： Leroy Andrew Gibson, Jr. ,  Dan M. Griffin ,  Lyman D. Horne ,  Randal R. Sylvester

IPC分类号： H04B1/707

CPC分类号： H04B1/7075

摘要： A method and device for frame sync detection using signal combining and correlation. The method comprises the steps of despreading PN coded signals to provide in-phase I1–In, and quadrature phase Q1–Qn signals, wherein each I1–In and each Q1–Qn signal contains at least one sync bit and n≧2. The at least one sync bit from each I1–In, and quadrature phase Q1–Qn signals are summed to form sums Is1 and Qs1, respectively. The next step provides a reference sync having at least one bit and compares each sum Is1 and Qs1 with the at least one reference bit. The results of each Is1 and Qs1 comparison are accumulated so as to form two accumulates, IA and QA, respectively. Each accumulate IA and QA, is squared to form IA2 and QA2 from which the sum IA2 and QA2 is formed. The sum IA2+QA2 is compared with a predetermined threshold and as a result of the comparison a determination of whether frame sync has been achieved is made.

摘要翻译： 一种使用信号组合和相关的帧同步检测的方法和装置。 该方法包括以下步骤：对PN编码信号进行解扩，以提供同相I 1 -I N n N，以及正交相位Q 1 -Q 1， 其中每个I 1 -I n个和每个Q 1 -Q N n个/ N个 >信号包含至少一个同步位，n> = 2。 来自每个I 1 -I N SUB的至少一个同步位以及正交相位Q 1 -Q N n N 信号被相加以形成和分别分别为I S 1和S 2。 下一步骤提供具有至少一个比特的参考同步，并将每个和I 1和S 1和S 1＆lt; S 1＆lt;和＆lt; S 1＆lt;＆gt;和至少一个参考比特进行比较。 每个I＆lt; s1＆gt;和＆lt; s1＆lt;比较比较的结果被累积，以便形成两个累加， SUB>。 每个累加I A和A A A均被平方以形成I A 2和Q A 2， 总和2和/或2＆lt; 2＆gt;和＆lt; 2＆gt; 2＆lt; 2＆gt; 形成了。 将总和与预定阈值进行比较，并作为比较的结果。 确定是否已经实现帧同步。

公开(公告)号：US06603368B1

公开(公告)日：2003-08-05

申请号：US10092865

申请日：2002-03-06

申请人： Ronald S. Leahy ,  Randal R. Sylvester ,  James M. Simkins

发明人： Ronald S. Leahy ,  Randal R. Sylvester ,  James M. Simkins

IPC分类号： H03D300

CPC分类号： H04L27/38 ,  H04L7/0054

摘要： A demodulator for demodulating clear mode waveforms such as Phase Shift Keyed and Quadrature Amplitude Modulated waveforms, is capable of demodulating signals with much greater data rates than the clock rate of the device in which the demodulator resides by converting serial input samples into vectors. The input vectors are converted to “soft-decision” (data estimate) vectors which are input to a parallel-to-serial multiplexer, and the vector elements are output serially at the symbol clock rate to represent demodulated data. In the preferred embodiment, the vector demodulator at least includes a preprocessor, a digital phase shifter, and a symbol demodulator which, inter alia, outputs a phase rotator command signal to control the carrier recover phase rotation process in the digital phase shifter. As a result, the maximum symbol rate—and hence the maximum data rate—is raised up to N times the device maximum clock rate for waveforms such as Biphase Shift Keying, where N represents the number of data elements in the vectors, and 2N for waveforms such as Quadrature Phase Shift Keyed. The data rate is increased by a factor of N for one sample per symbol, and by a factor of N/2 for 2 samples per symbol, etc.

摘要翻译： 用于解调诸如相移键控和正交幅度调制波形的清除模式波形的解调器能够通过将串行输入样本转换为向量来解调比解调器所在设备的时钟速率高得多的数据速率的信号。 将输入矢量转换为输入到并行到串行多路复用器的“软判决”（数据估计）向量，并且以符号时钟速率串行地输出向量元素以表示解调数据。 在优选实施例中，矢量解调器至少包括预处理器，数字移相器和符号解调器，其特别地，输出相位旋转器命令信号以控制数字移相器中的载波恢复相位旋转处理。 结果是，最大符号速率（因此最大数据速率）升高到诸如双相移键控等波形的器件最大时钟速率的N倍，其中N表示向量中的数据元素的数量，2N表示 波形如正交相移键控。 对于每个符号的一个样本，数据速率增加一个因子N，对于每个符号的2个样本等于N / 2的因子。

公开(公告)号：US07978747B1

公开(公告)日：2011-07-12

申请号：US11351370

申请日：2006-02-09

申请人： Johnny M. Harris ,  Thomas R. Giallorenzi ,  Randal R. Sylvester ,  Richard Galindez ,  Kevin L. Hyer ,  Larry S. Thomson ,  Samuel C. Kingston

发明人： Johnny M. Harris ,  Thomas R. Giallorenzi ,  Randal R. Sylvester ,  Richard Galindez ,  Kevin L. Hyer ,  Larry S. Thomson ,  Samuel C. Kingston

IPC分类号： H04B1/00

CPC分类号： H04J13/0074 ,  H04B1/707 ,  H04J13/0077 ,  H04J13/107

摘要： A method of transmitting a spread spectrum signal in a single communication session between a transmitter and a receiver, stores a series of N unique waveform designs and a hopping sequence in a transmitter memory. A signal is transmitted to a receiver according to the hopping sequence using the plurality of N unique waveform designs. Preferably, each waveform design is characterized by a unique composite spreading code that is formed by at least some of a plurality of constituent code segments. Alternatively or additionally, the waveform designs may differ by any one or more of code length, symbol or chip timing or phase, frame or burst structure, chip offset, modulation, error control coding, encryption scheme, or scrambling code. A transmitter and receiver are also disclosed, as is the concept of appending chips between symbols to expand the universe of unique spreading codes without incurring an increase in processing gain.

摘要翻译： 在发射机和接收机之间的单个通信会话中发送扩频信号的方法在发射机存储器中存储一系列N个唯一波形设计和跳频序列。 使用多个N个唯一波形设计，根据跳频序列将信号发送到接收机。 优选地，每个波形设计的特征在于由多个构成代码段中的至少一些构成的独特的复合扩展码。 替代地或附加地，波形设计可以由码长，符号或码片定时或相位，帧或突发结构，码片偏移，调制，错误控制编码，加密方案或扰码中的任何一个或多个来区分。 还公开了发射机和接收机，以及在符号之间附加码片的概念，以扩展独特扩展码的宇宙，而不会增加处理增益。

公开(公告)号：US07321609B1

公开(公告)日：2008-01-22

申请号：US10675185

申请日：2003-09-30

申请人： Merle L. Keller ,  Dale D. Fonnesbeck ,  Kenneth C. Bark ,  Randal R. Sylvester

发明人： Merle L. Keller ,  Dale D. Fonnesbeck ,  Kenneth C. Bark ,  Randal R. Sylvester

IPC分类号： H04B1/69

CPC分类号： H04B1/7075

摘要： A system for verifying composite pseudo-noise (PN) encoded signals. The system provides at least three PN component codes, wherein the at least three PN component codes are relatively prime. The system partially correlates a received PN composite encoded signal with a first minor epoch derived from the at least three PN component codes. The system searches for phase alignment of the received PN composite encoded signal with a second minor epoch derived from the at least three PN component codes. The system correlates the received PN composite encoded signal with a receiver PN composite code phase when the first minor epoch and the searched second minor epoch are separated by a predetermined phase.

摘要翻译： 一种用于验证复合伪噪声（PN）编码信号的系统。 该系统提供至少三个PN分量代码，其中至少三个PN分量代码是相对素数。 系统将接收的PN复合编码信号与从至少三个PN分量代码导出的第一次要时段部分地相关。 该系统搜索所接收的PN复合编码信号与从至少三个PN分量代码导出的第二小时序的相位对准。 当第一次要时期和搜索到的第二次要时期被预定相位隔开时，系统将接收到的PN复合编码信号与接收机PN复合码相位相关。

公开(公告)号：US07161920B2

公开(公告)日：2007-01-09

申请号：US10292141

申请日：2002-11-12

申请人： Harold L. Simonsen ,  Kent R. Bruening ,  Randal R. Sylvester

发明人： Harold L. Simonsen ,  Kent R. Bruening ,  Randal R. Sylvester

IPC分类号： H04Q7/28 ,  H04B1/69

CPC分类号： H04B1/707 ,  H04B2201/70701 ,  H04L27/18

摘要： A novel MODEM and method of operating a MODEM usable in spread spectrum communication utilizing multiple waveforms in orthogonal spread signals imbeds a tracking signal in one of the spread signals for efficient tracking by a receiver so that both spread signals can have wideband characteristics. Therefore, one spread signal contains a tracking channel and a wideband channel, allowing for higher order modulation in the wideband channel for transmitting information, while still providing good tracking features. The second spread signal is an orthogonal wideband channel serving as the main high data rate conduit. In the preferred embodiment, the first portion of the waveform (in the first spread signal) is modulated using Bi-Bi-Phase Shift Keying (Bi-BPSK), while the second portion of the waveform (in the second spread signal) is modulated using Multiple Phase Shift Keying (MPSK). The two waveform portions are Time Division Multiplexed (TDM) at the chipping rate. A higher overall data bandwidth can be achieved for the Bi-BPSK modulation technique using the same channel bandwidth.

摘要翻译： 使用在正交扩展信号中利用多个波形的可用于扩展频谱通信的MODEM的新型MODEM和方法在一个扩展信号中嵌入跟踪信号，以便接收机有效跟踪，使得两个扩展信号都可以具有宽带特性。 因此，一个扩展信号包含跟踪信道和宽带信道，允许宽带信道中的更高阶调制用于传输信息，同时仍然提供良好的跟踪特征。 第二扩展信号是用作主高数据速率管道的正交宽带信道。 在优选实施例中，波形的第一部分（在第一扩展信号中）使用Bi-Bi相移键控（Bi-BPSK）进行调制，而波形的第二部分（在第二扩展信号中）被调制 使用多相移键控（MPSK）。 两个波形部分是切分率的时分复用（TDM）。 对于使用相同信道带宽的Bi-BPSK调制技术，可以实现更高的总体数据带宽。