公开(公告)号：US20070019900A1

公开(公告)日：2007-01-25

申请号：US11424012

申请日：2006-06-14

Applicant: Geoff Taylor ,  Jianhong Cai ,  Daniel Upp

Inventor： Geoff Taylor ,  Jianhong Cai ,  Daniel Upp

IPC: G02B6/12

CPC classification number: H01Q1/525 ,  H03M3/43 ,  H03M3/454 ,  H03M3/456 ,  H04B1/525

Abstract: Interference caused by the propagation of a transmit signal transmitted from a transmit antenna to a receive antenna is effectively cancelled by an improved signal cancellation system. The system includes an interference cancellation signal generator that generates a time-delayed and amplitude-reduced representation of said transmit signal. A summing stage is operably coupled to the interference cancellation signal generator and the receive antenna. The summing stage subtracts the time-delayed and amplitude-reduced representation of the transmit signal from a receive signal to substantially cancel the interference. The interference cancellation signal generator preferably includes a novel programmable optical delay line that introduces a variable amount of optical delay to an optical signal derived from said transmit signal in addition to a thyristor-based sigma delta modulator that converts samples of the transmit signal to into a digital signal in the optical domain.

Abstract translation: 通过改进的信号消除系统有效地消除由从发射天线发射到接收天线的发射信号的传播引起的干扰。 该系统包括产生所述发射信号的时间延迟和幅度减小的表示的干扰消除信号发生器。 求和级可操作地耦合到干扰消除信号发生器和接收天线。 求和级从接收信号中减去发射信号的时间延迟和幅度减小的表示，以基本上消除干扰。 干扰消除信号发生器优选地包括一种新颖的可编程光学延迟线，其将可变量的光学延迟引入到从所述发射信号导出的光学信号，以及基于可控硅的Σ-Δ调制器，其将发射信号的采样转换为 光域中的数字信号。

公开(公告)号：US20060039415A1

公开(公告)日：2006-02-23

申请号：US10924046

申请日：2004-08-23

Applicant: Daniel Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

Inventor： Daniel Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

IPC: H04J3/04

CPC classification number: H04J3/0623

Abstract: Methods for retiming SONET signals include demultiplexing STS-1 signals from an STS-N signal, buffering each of the STS-1 signals in a FIFO, determining the FIFO depth over time, and determining a pointer leak rate based in part on FIFO depth and also based on the rate of received pointer movements. According to the presently preferred embodiment, each FIFO is 29 bytes deep. If FIFO depth is 12-17 bytes, no leaking is performed. If the depth is 8-12 bytes or 17-21 bytes, a slow leak rate is set. If the depth is 4-8 bytes or 21-25 bytes, a fast leak rate is set. If the depth is 0-4 bytes or 25-29 bytes, pointer movements are immediate. The calculated leak rates are based on the net number of pointer movements (magnitude of positive and negative movements summed) received during a sliding window of n×32 seconds (n×256,000 frames).

Abstract translation: 重新定时SONET信号的方法包括从STS-N信号中解复用STS-1信号，缓冲FIFO中的每个STS-1信号，确定随时间的FIFO深度，以及部分地基于FIFO深度确定指针泄漏率， 也基于接收到的指针移动速率。 根据当前优选的实施例，每个FIFO是29字节深。 如果FIFO深度为12-17字节，则不会发生泄漏。 如果深度为8-12字节或17-21字节，则设置缓慢的泄漏率。 如果深度为4-8字节或21-25字节，则设置快速泄漏率。 如果深度为0-4字节或25-29字节，则指针移动立即。 计算的泄漏率基于在nx32秒（nx256,000帧）的滑动窗口期间接收到的指针移动的净数（正和负移动相加的大小）。