公开(公告)号：US06898212B1

公开(公告)日：2005-05-24

申请号：US09713778

申请日：2000-11-14

申请人： Dexter Chun ,  Manoj Deshpande ,  Steve Hicks ,  Bob Knight ,  KC Lee ,  Ravi Palakodety ,  Ramesh Ramaswamy ,  Gustavo Serena ,  Dave Walker ,  Jun Zhang

发明人： Dexter Chun ,  Manoj Deshpande ,  Steve Hicks ,  Bob Knight ,  KC Lee ,  Ravi Palakodety ,  Ramesh Ramaswamy ,  Gustavo Serena ,  Dave Walker ,  Jun Zhang

IPC分类号： H04B7/26 ,  H04J3/06

CPC分类号： H04B7/2628

摘要： A Base Station Controller (BSC) that reduces the occurrence of audible noise in a Code Division Multiple Access (CDMA) radio network is provided. The BSC according to one embodiment of the present invention comprises a Media Stream Board (MSB) for compressing groups of 160 PCM speech samples from a Public Switch Telephone Network (PSTN) into vocoded frames, and a Special Purpose Board (SPB) for reformatting the vocoded frames from the MSB into over-the-air CDMA vocoded frames. The MSB and SPB each have a local timer that is slave to “PSTN time”. The BSC further comprises a Timing Unit Board (TUB) connected to a GPS receiver. The TUB receives “GPS time” from the GPS receiver. The TUB generates timing cells, each containing time-of-day information according to “GPS time”. The TUB distributes the timing cells to the MSB and the SPB over an Asynchronous Transfer Mode (ATM) network. The MSB and SPB use the received timing cells to compare their local timer, which tracks “PSTN time”, to “GPS time”. The MSB and the SPB realign their local timer with “GPS time” whenever their local timer drifts from “GPS time” outside of a predetermined time window.

摘要翻译： 提供了一种在码分多址（CDMA）无线电网络中减少可听噪声的发生的基站控制器（BSC）。 根据本发明的一个实施例的BSC包括用于将来自公共交换电话网（PSTN）的160个PCM语音样本的组压缩为声码帧的媒体流板（MSB），以及专用板（SPB），用于重新格式化 从MSB到无线CDMA语音码帧的声码帧。 MSB和SPB每个都有一个本地定时器，从站到“PSTN时间”。 BSC还包括连接到GPS接收机的定时单元板（TUB）。 TUB从GPS接收机接收“GPS时间”。 TUB产生定时单元，每个单元包含根据“GPS时间”的日期信息。 TUB通过异步传输模式（ATM）网络将定时单元分配给MSB和SPB。 MSB和SPB使用接收到的定时单元将其“PSTN时间”跟踪的本地定时器与“GPS时间”进行比较。 当本地定时器从预定时间窗口之外的“GPS时间”漂移时，MSB和SPB将其本地定时器重新对准“GPS时间”。

公开(公告)号：US07092409B2

公开(公告)日：2006-08-15

申请号：US09814658

申请日：2001-03-21

申请人： Dexter Chun ,  Steve Hicks ,  Bob Knight ,  KC Lee ,  Ravi Palakodety ,  Dave Walker ,  Jun Zhang

发明人： Dexter Chun ,  Steve Hicks ,  Bob Knight ,  KC Lee ,  Ravi Palakodety ,  Dave Walker ,  Jun Zhang

IPC分类号： H04L12/42

CPC分类号： H04B7/2693 ,  H04J3/0685 ,  H04J3/0688

摘要： A timing network for a wireless communication network includes first and second Timing Unit Board (TUB) and processor boards for processing speech channels of the radio network, each processor board having a local timer that is slave to “PSTN time” from a Public Switch Telephone Network (PSTN). The first and second TUB each alternately transmits a timing cell containing time information to each processor board over a transport network. Each processor board realigns its local timer with the time information contained in a received timing cell whenever its local timer drifts from the time information contained in the received timing cell by a predetermined time offset. When one of the TUBs fails to transmit timing cells to the processor boards or transmits timing cells containing erroneous time information, the processor boards rely on the remaining TUB for timing cells to realign their local timers.

公开(公告)号：US07680420B1

公开(公告)日：2010-03-16

申请号：US10872850

申请日：2004-06-21

申请人： Dave Walker ,  Kim B. Roberts ,  Maurice O'Sullivan ,  Leo Strawczynski ,  James Whiteaway ,  Christopher Fludger ,  Han Henry Sun ,  Adrien Comeau

发明人： Dave Walker ,  Kim B. Roberts ,  Maurice O'Sullivan ,  Leo Strawczynski ,  James Whiteaway ,  Christopher Fludger ,  Han Henry Sun ,  Adrien Comeau

IPC分类号： H04B10/00

CPC分类号： H04B10/5051 ,  H04B10/25137

摘要： A method of synthesizing a modulated optical signal using a laser cascaded with an amplitude modulator. A phase drive signal VF(t) is derived for driving the laser to generate an optical carrier signal with a desired phase φ(t). An amplitude drive signal VS(t) is then derived for driving the amplitude modulator to impose a desired amplitude S(t) onto the optical carrier signal generated by the laser. The amplitude drive signal VS(t) is compensated for amplitude modulation of the optical carrier signal generated by the laser.

摘要翻译： 使用与幅度调制器级联的激光来合成调制光信号的方法。 导出相位驱动信号VF（t），用于驱动激光器以产生具有期望相位（t）的光载波信号。 然后导出幅度驱动信号VS（t），用于驱动幅度调制器，以将期望的振幅S（t）施加到由激光器产生的光载波信号上。 振幅驱动信号VS（t）被补偿由激光器产生的光载波信号的幅度调制。