公开(公告)号：US07209494B1

公开(公告)日：2007-04-24

申请号：US09694870

申请日：2000-10-24

申请人： Dan M Griffin ,  Samuel C. Kingston ,  Delon K. Jones ,  Randal R. Sylvester

发明人： Dan M Griffin ,  Samuel C. Kingston ,  Delon K. Jones ,  Randal R. Sylvester

IPC分类号： H04J3/06

CPC分类号： H04L27/0014 ,  H04B1/7085 ,  H04L2027/0022 ,  H04L2027/003 ,  H04L2027/0077

摘要： A Time Division Duplex (TDD), Code Division Multiple Access (CDMA) communication system includes a plurality of Customer Premises Equipment (CPE) and an Access Point (AP) that communicate through RF links. A CPE contains a receiver baseband subsystem and a transmitter baseband subsystem, and further contains receiver circuitry operable during a receive period for receiving an RF carrier from the AP and for deriving a receiver tracking signal that is indicative of a frequency and phase shift between the received RF carrier and a reference signal. The receiver circuitry further includes a frequency to phase accumulator (FPA) and a digital phase shifter (DPS) for correcting the frequency and phase of a receiver baseband signal by an amount and in a direction indicated by the receiver tracking signal. CPE transmitter circuitry is operable during a next transmission period for operating the FPA and DPS circuitry to correct the frequency of a transmitter baseband signal by an amount indicated by the receiver tracking signal, and in a direction opposite to the direction indicated by the receiver tracking signal.

摘要翻译： 时分双工（TDD），码分多址（CDMA）通信系统包括通过RF链路进行通信的多个客户驻地设备（CPE）和接入点（AP）。 CPE包含接收机基带子系统和发射机基带子系统，并且还包括在接收周期期间可操作以接收来自AP的RF载波的接收机电路，并且用于导出指示接收到的频率和相移之间的接收机跟踪信号 RF载波和参考信号。 接收器电路还包括频率相位累加器（FPA）和数字移相器（DPS），用于将接收器基带信号的频率和相位按接收器跟踪信号指示的量和量来校正。 在下一个传输周期期间，CPE发射机电路可操作，用于操作FPA和DPS电路，以将接收器跟踪信号指示的量校正发射机基带信号的频率，并且在与由接收机跟踪信号指示的方向相反的方向上 。

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：US08386543B1

公开(公告)日：2013-02-26

申请号：US11540340

申请日：2006-09-28

申请人： Johnny M. Harris ,  Thomas R. Giallorenzi ,  Matt Lake ,  Samuel C. Kingston ,  Randal R. Sylvester

发明人： Johnny M. Harris ,  Thomas R. Giallorenzi ,  Matt Lake ,  Samuel C. Kingston ,  Randal R. Sylvester

IPC分类号： G06F7/00

CPC分类号： G06F7/38 ,  G06F2207/3812

摘要： A technique for reducing memory usage during signal processing includes storing least significant portions of a plurality of intermediate results in a first memory. Most significant portions of a subset the plurality of intermediate results are stored in a second memory having a smaller length than the first memory. A data linkage is maintained between the most significant portions and corresponding least significant portions.

摘要翻译： 用于在信号处理期间减少存储器使用的技术包括将多个中间结果的最低有效部分存储在第一存储器中。 将多个中间结果的子集的最重要部分存储在具有比第一存储器更小的长度的第二存储器中。 在最重要部分和对应的最不重要部分之间保持数据连接。

公开(公告)号：US08036255B1

公开(公告)日：2011-10-11

申请号：US12383059

申请日：2009-03-18

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.

公开(公告)号：US5805584A

公开(公告)日：1998-09-08

申请号：US606378

申请日：1996-02-23

申请人： Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Randal R. Sylvester ,  David W. Matolak ,  Patrick J. Smith

发明人： Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Randal R. Sylvester ,  David W. Matolak ,  Patrick J. Smith

IPC分类号： H04B1/7075 ,  H04B1/7103 ,  H04B7/24 ,  H04B7/26 ,  H04B7/216 ,  H04J3/06

CPC分类号： H04B1/70755 ,  H04B1/70753 ,  H04B1/7103 ,  H04B2201/709709

摘要： Disclosed are methods for acquiring a forward channel in a point-to-multipoint CDMA system. One method includes the steps of (a) despreading a received CDMA signal with a first pn code that is known to be present in the received CDMA signal and obtaining a first measure of received signal level; (b) despreading the received CDMA signal with a second pn code that is known not to be present in the received CDMA signal and obtaining a second measure of received signal level; and (c) synchronizing to a desired channel using a difference between the first and second signal levels. In this method the first step of despreading despreads a continuously transmitted side-channel, and the step of synchronizing synchronizes to the side-channel. Also, the step of obtaining a first measure of received signal level obtains a correlation peak, and the step of obtaining a second measure of received signal level obtains a correlation null. Preferably, the steps of despreading and obtaining are accomplished iteratively over a range of n first pn code phase states and over a range of n second pn code phase states.

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：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：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：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。