公开(公告)号：US20080101210A1

公开(公告)日：2008-05-01

申请号：US11613823

申请日：2006-12-20

申请人： Robert J. Thompson ,  Michael J. Cooper ,  Charles S. Moore ,  John L. Moran III

发明人： Robert J. Thompson ,  Michael J. Cooper ,  Charles S. Moore ,  John L. Moran III

IPC分类号： H04J9/00

CPC分类号： H04B10/0775 ,  H04B10/079 ,  H04L1/0003 ,  H04L1/002

摘要： The available modulation schemes of a network are analyzed to determine which ones contain excessive phase noise or narrowband interference. A network element is selected and assigned to a test channel at a first modulation scheme at a predetermined power level to achieve a predetermined PER. The network element transmits a test signal and the network controller measures the signal to noise ratio (SNR) in the received test signal. If the SNR is not within a predetermined tolerance range of an estimated SNR for the modulation scheme at the predetermined PER, the modulation scheme is determined to have excessive phase noise or narrowband interference. Each available modulation scheme is tested by instructing the network element to transmit the test signal using each modulation scheme and assigning the power level of each modulation scheme. The suitable modulation schemes may be determined.

摘要翻译： 分析网络的可用调制方案以确定哪些包含过多的相位噪声或窄带干扰。 以预定功率电平选择并以第一调制方案将测试信道分配给测试信道以实现预定的PER。 网络元件发送测试信号，网络控制器测量接收到的测试信号中的信噪比（SNR）。 如果SNR在预定的PER下不在调制方案的估计SNR的预定公差范围内，则调制方案被确定为具有过大的相位噪声或窄带干扰。 每个可用的调制方案通过指示网络单元使用每个调制方案发送测试信号并分配每个调制方案的功率电平来测试。 可以确定合适的调制方案。

公开(公告)号：US5732104A

公开(公告)日：1998-03-24

申请号：US355939

申请日：1994-12-14

申请人： William Leslie Brown ,  John L. Moran III ,  Manickam R. Sridhar

发明人： William Leslie Brown ,  John L. Moran III ,  Manickam R. Sridhar

IPC分类号： H04M11/06 ,  H04B1/38

CPC分类号： H04M11/06

摘要： The present method (200,300, 400) and device (500, 600, 700) modify phase two of the format set forth in the V.34 Recommendation of the International Telecommunication Union-Telecommunication Standardization Sector to prevent premature disconnection of calls between a call modem and an answer modem. The method and device efficiently ensure connection of the call for high speed data transmission over voiceband channels, by modification of one of: a phase preliminary to phase one and phase two. One implementation, in the answer modem, includes transmitting a signal having first information, followed by a Signal S comprising of aguard tone and a signal S1, wherein an energy of a predetermined guard tone is greater than an energy of a predetermined range of frequencies of the Signal S1; and continuing transmitting and receiving in accordance with the modified V.34 operation.

摘要翻译： 本方法（200,300,400）和设备（500,600,700）修改了国际电信联盟 - 电信标准化部门V.34建议书中阐述的格式的第二阶段，以防止呼叫调制解调器之间的呼叫过早断开 和一个应答调制解调器。 该方法和设备有效地确保通过语音频带信道进行高速数据传输的呼叫的连接，通过修改以下之一：初步到阶段1和阶段2之一。 在应答调制解调器中的一个实施方式包括发送具有第一信息的信号，随后是包括aguard音和信号S1的信号S，其中预定保护音的能量大于预定保护音的预定频率的能量 信号S1; 并根据经修改的V.34操作继续发送和接收。