公开(公告)号：US06456644B1

公开(公告)日：2002-09-24

申请号：US08880578

申请日：1997-06-23

申请人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

发明人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

IPC分类号： H04L2730

CPC分类号： H04B1/70752 ,  H04B1/70757 ,  H04B1/708

摘要： A spread spectrum signal is processed after it is sampled at a selected sampling rate and tuned to a center frequency lower than the sampling rate and greater than zero. The signal is multiplied against a reference signal to produce a corresponding product output, and an accumulation output is formed by combining the product output with a phase-shifted version of the accumulation output.

摘要翻译： 在以选定的采样率对其进行采样并调谐到低于采样率的中心频率并大于零时，对其进行处理。 信号与参考信号相乘以产生相应的乘积输出，并且通过将积积输出与累积输出的相移版本组合来形成累加输出。

公开(公告)号：US06263009B1

公开(公告)日：2001-07-17

申请号：US08881549

申请日：1997-06-23

申请人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

发明人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

IPC分类号： H04L2730

CPC分类号： H04B1/70752 ,  H04B1/707 ,  H04B1/708

摘要： A spread spectrum signal is detected at an unknown spreading signal phase by sampling the signal at a selected sampling rate and performing a despreading function on the sampled signal using multiple reference signals, each of which represents one of multiple search phases of the spreading signal. Accumulation outputs then are produced by combining each despreading output with a phase-shifted version of the corresponding accumulation output.

摘要翻译： 通过以选定的采样率对信号进行采样来检测扩频信号，并使用多个参考信号对采样信号执行解扩功能，每个参考信号表示扩频信号的多个搜索相位之一。 然后通过将每个去扩展输出与相应的累加输出的相移版本组合来产生累加输出。

公开(公告)号：US06047016A

公开(公告)日：2000-04-04

申请号：US880634

申请日：1997-06-23

申请人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

发明人： Erik A. Ramberg ,  Robert K. Froelich ,  Forrest F. Fulton

IPC分类号： H04B1/707 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/69

CPC分类号： H04B1/70752 ,  H04B1/707 ,  H04B1/708

摘要： A spread spectrum signal sampled at a selected sampling rate is despread and accumulated in an accumulation element at a center frequency lower than the sampling rate and higher than zero. A frequency adjustment element may be used to adjust the accumulation element to have a resonant frequency approximately equal to the center frequency.

摘要翻译： 以选择的采样率采样的扩频信号在低于采样率的中心频率并且高于零的情况下被累积在累积元件中。 可以使用频率调节元件来调整累积元件以使谐振频率近似等于中心频率。

公开(公告)号：US5604768A

公开(公告)日：1997-02-18

申请号：US361799

申请日：1994-12-21

申请人： Forrest F. Fulton

发明人： Forrest F. Fulton

IPC分类号： H04B1/40 ,  H04B1/56 ,  H04B7/26 ,  H04J1/06 ,  H04J3/06 ,  H04L7/033 ,  H04L25/03 ,  H04L25/06 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233 ,  H04L27/38 ,  H04B1/38 ,  H04L5/16

CPC分类号： H04L27/3854 ,  H04B1/56 ,  H04B7/2675 ,  H04J1/065 ,  H04L25/061 ,  H04L27/2332 ,  H04W56/0035 ,  H04B1/408 ,  H04L2027/0028 ,  H04L2027/0057

摘要： A bidirectional radio system for low-cost high-throughput accumulation of data from a large number of site units. Frequency synchronization is achieved at low cost by transmitting a high accuracy carrier and clock signal at a base station, and using receiving circuitry at remote stations to extract the base clock signal and base carrier frequency and a phase-lock loop to stabilize the remote station carriers. A burst demodulator at a base station receiver can decode a short remote station response by scaling the response with the phase and amplitude of an initial segment of the response. The burst demodulator may continuously update the decoding threshold based on a comparison of the signal amplitude and the current value of the decoding threshold. In an alternate embodiment, the carrier synthesizer is not part of a phase-lock loop, but the transmitted signal is rotated by a phase proportional to a frequency error to provide an accurate carrier frequency. In yet another alternate embodiment only a frequency-control loop is implemented, and again the transmitted signal is rotated by a phase ramp proportional to a frequency error to provide an accurate carrier frequency. In this embodiment separate rotators may be used on both the transmission and reception sides of the circuit, or a single rotator may be switched between the transmission and reception sides of the circuit for half-duplex operation.

摘要翻译： 一种双向无线电系统，用于从大量站点单元的低成本高吞吐量积累数据。 通过在基站发送高精度载波和时钟信号，并且使用远端站处的接收电路来提取基本时钟信号和基本载波频率以及锁相环路以稳定远程站载波，以低成本实现频率同步 。 在基站接收机处的突发解调器可以通过响应的初始段的相位和幅度缩放响应来解码短的远程站响应。 突发解调器可以基于信号幅度和解码阈值的当前值的比较来连续更新解码阈值。 在替代实施例中，载波合成器不是锁相环路的一部分，而是传输的信号被旋转与频率误差成比例的相位，以提供精确的载波频率。 在又一替代实施例中，仅实现频率控制环路，并且再次将发射的信号旋转与频率误差成比例的相位斜坡以提供精确的载波频率。 在该实施例中，可以在电路的发送侧和接收侧上使用单独的旋转器，或者可以在用于半双工操作的电路的发送侧和接收侧之间切换单个旋转器。

公开(公告)号：US5068863A

公开(公告)日：1991-11-26

申请号：US512296

申请日：1990-04-17

申请人： Forrest F. Fulton

发明人： Forrest F. Fulton

IPC分类号： H01S5/042 ,  H01S5/062 ,  H04B10/155

CPC分类号： H04B10/58 ,  H01S5/06213 ,  H04B10/504 ,  H01S5/042

摘要： A circuit which improves the linearity of a high power laser diode is disclosed. A electrical diode is coupled to the anode of the laser diode and a filter/bias network back biases the laser diode and forward biases the PN diode. At lower current levels the amount of current flowing through the laser diode is lowered. At higher current levels, rolloff in the PN diode allows more current through the laser diode. The rolloff performance of the laser diode and PN diode mirror each other closely enough to improve the laser's linear performance by 3 dB to 5 dB.

摘要翻译： 公开了一种提高高功率激光二极管的线性度的电路。 电二极管耦合到激光二极管的阳极，滤波器/偏置网络背部偏置激光二极管，并向前偏置PN二极管。 在较低的电流水平下，流过激光二极管的电流量降低。 在较高的电流水平，PN二极管的降低允许更多的电流通过激光二极管。 激光二极管和PN二极管的滚降性能相当接近，足以将激光器的线性性能提高3 dB至5 dB。