公开(公告)号：US06643321B1

公开(公告)日：2003-11-04

申请号：US09162995

申请日：1998-09-30

申请人： Michael Joshua Genossar ,  Natan Mizrahi ,  Max Gotman ,  Naftali Chayat

发明人： Michael Joshua Genossar ,  Natan Mizrahi ,  Max Gotman ,  Naftali Chayat

IPC分类号： H04B138

CPC分类号： H04L25/03038 ,  H04L27/2273 ,  H04L2025/03477 ,  H04L2025/03617 ,  H04L2025/03668 ,  H04L2027/0028 ,  H04L2027/0046 ,  H04L2027/0067 ,  H04L2027/0069

摘要： A modem for more efficiently processing a received analog signal into a digital output. The modem preferably features an adaptive equalizer with coefficients which are saved and reused for processing of subsequent analog signals, in order to reduce the time required to reach convergence. In addition, preferably the modem features an automatic carrier frequency control which adjusts the sampled digital signal according to both the carrier phase offset and the carrier frequency offset. Again, in order to process the signal more quickly and efficiently, preferably the carrier frequency offset is stored and reused for processing subsequent signals.

摘要翻译： 用于将接收的模拟信号更有效地处理成数字输出的调制解调器。 调制解调器优选地具有自适应均衡器，其具有被保存和重新用于后续模拟信号的处理的系数，以便减少达到收敛所需的时间。 此外，优选地，调制解调器具有自动载波频率控制，其根据载波相位偏移和载波频率偏移来调整采样的数字信号。 再次，为了更快速和有效地处理信号，优选地，载波频率偏移被存储并重新用于处理后续信号。

公开(公告)号：US06628707B2

公开(公告)日：2003-09-30

申请号：US09849687

申请日：2001-05-04

申请人： Manouchehr S. Rafie ,  Jun Lu ,  Dengwei Fu ,  Tushar Shah

发明人： Manouchehr S. Rafie ,  Jun Lu ,  Dengwei Fu ,  Tushar Shah

IPC分类号： H03H740

CPC分类号： H04L25/03038 ,  H04L2025/03477 ,  H04L2025/03668

摘要： A method for an adaptive equalization apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive variable-length bursts of radio signals on the plurality of radio links and equalizing amplitude and phase variations of a slow channel for each radio link from a received burst on the radio link. Further, the method includes storing the estimated tap coefficients pertinent to each radio link and using the tap weights of the current burst of the radio link to reliably pre-compensate the channel amplitude and phase distortion of a next received burst on the radio link.

公开(公告)号：US06597733B2

公开(公告)日：2003-07-22

申请号：US09800268

申请日：2001-03-05

申请人： Stephen C. Pollmann ,  Eli Arviv ,  Jacques Behar ,  Timothy L. Gallagher ,  David Gazelle ,  Frederick W. Price

发明人： Stephen C. Pollmann ,  Eli Arviv ,  Jacques Behar ,  Timothy L. Gallagher ,  David Gazelle ,  Frederick W. Price

IPC分类号： H04B138

CPC分类号： H04L1/20 ,  H04L1/0003 ,  H04L1/0036 ,  H04L1/004 ,  H04L7/0029 ,  H04L7/042 ,  H04L25/03057 ,  H04L27/0012 ,  H04L27/3809 ,  H04L2025/03401 ,  H04L2025/0342 ,  H04L2025/03668 ,  H04L2025/03783

摘要： A system and method for enhancing the performance of an equalizer in a modem. Multiple techniques are disclosed which improve the modem performance. A first technique uses stored parameters for each burst from each remote site to demodulate a received data stream. A second technique compensates for the gain droop caused by storing parameters across each burst. A third technique minimizes errors caused by adapting the equalizer coefficients for each data burst by analyzing the SN ratio and error rate of the received burst. A fourth technique improves the convergence of the equalizer by using a two-part preamble, whereby both parts are transmitted using different modulation techniques. A fifth technique is provided which performs a soft reset of the modem without performing a complete reset of the modem. A sixth technique determines a modem adaptation factor based on the expected modulation type of an incoming burst transmission. A seventh technique calculates a phase correction value for the stored tap values and applies the value to the incoming signal.

公开(公告)号：US06590872B1

公开(公告)日：2003-07-08

申请号：US09176182

申请日：1998-10-21

申请人： Dong-Chang Shiue ,  Kumar Ramaswamy ,  Paul Gothard Knutson

发明人： Dong-Chang Shiue ,  Kumar Ramaswamy ,  Paul Gothard Knutson

IPC分类号： H04Q700

CPC分类号： H04B1/709 ,  H04B1/7085 ,  H04L7/0029 ,  H04L2025/03668

摘要： A receiver of a handset transceiver, in a wireless telephone system having a plurality of wireless handset and a base unit having a base transceiver. Each handset has a handset transceiver for establishing a time-division multiple access (TDMA) link over a shared channel with the base unit via the base transceiver, in which each handset communicates during an exclusive time slot of a TDMA scheme that allocates time slots to handsets during an exclusive time slot of a TDMA scheme that allocates time slots to active handsets for receiving a spread spectrum signal comprising successive chips representing successive symbols. Each receiver has one or more demodulation loops for demodulating the received spread spectrum signal, wherein each demodulation loop is characterized by one or more demodulation loop parameters. A parallel correlator of the receiver detects a peak bin and provides the peak bin and two adjacent bins. An error estimator of the receiver adjusts the demodulation parameters in accordance with the peak bin and the two adjacent bins to optimize demodulation of the spread spectrum signal.

摘要翻译： 在具有多个无线手机的无线电话系统和具有基地收发信机的基站单元的手持收音机的接收机中。 每个手机具有手持机收发器，用于经由基站收发器通过基本单元在共享信道上建立时分多址（TDMA）链路，其中每个手机在分配时隙的TDMA方案的专用时隙期间进行通信 在TDMA方案的专用时隙中的手机，其向有源手机分配时隙以接收包括表示连续符号的连续码片的扩频信号。 每个接收机具有用于解调所接收的扩展频谱信号的一个或多个解调回路，其中每个解调循环由一个或多个解调循环参数表征。 接收机的并行相关器检测峰值仓，并提供峰值仓和两个相邻的仓。 接收机的误差估计器根据峰仓和两个相邻的箱来调整解调参数，以优化扩频信号的解调。

公开(公告)号：US20020154688A1

公开(公告)日：2002-10-24

申请号：US09800268

申请日：2001-03-05

发明人： Stephen C. Pollmann ,  Eli Arviv ,  Jacques Behar ,  Timothy L. Gallagher ,  David Gazelle ,  Frederick W. Price

IPC分类号： H04B001/10

CPC分类号： H04L1/20 ,  H04L1/0003 ,  H04L1/0036 ,  H04L1/004 ,  H04L7/0029 ,  H04L7/042 ,  H04L25/03057 ,  H04L27/0012 ,  H04L27/3809 ,  H04L2025/03401 ,  H04L2025/0342 ,  H04L2025/03668 ,  H04L2025/03783

摘要： A system and method for enhancing the performance of an equalizer in a modem. Multiple techniques are disclosed which improve the modem performance. A first technique uses stored parameters for each burst from each remote site to demodulate a received data stream. A second technique compensates for the gain droop caused by storing parameters across each burst. A third technique minimizes errors caused by adapting the equalizer coefficients for each data burst by analyzing the SN ratio and error rate of the received burst. A fourth technique improves the convergence of the equalizer by using a two-part preamble, whereby both parts are transmitted using different modulation techniques. A fifth technique is provided which performs a soft reset of the modem without performing a complete reset of the modem. A sixth technique determines a modem adaptation factor based on the expected modulation type of an incoming burst transmission. A seventh technique calculates a phase correction value for the stored tap values and applies the value to the incoming signal.

摘要翻译： 一种用于增强调制解调器中的均衡器的性能的系统和方法。 公开了改进调制解调器性能的多种技术。 第一种技术使用来自每个远程站点的每个突发的存储参数来解调所接收的数据流。 第二种技术补偿了通过在每个突发之间存储参数而引起的增益下降。 第三种技术通过分析接收到的突发的SN比和错误率来最小化通过针对每个数据突发调整均衡器系数而引起的误差。 第四种技术通过使用两部分前导码来改善均衡器的收敛，由此两部分都使用不同的调制技术进行发送。 提供了在不执行调制解调器的完全复位的情况下执行调制解调器的软复位的第五技术。 第六种技术基于输入突发传输的预期调制类型来确定调制解调器适配因子。 第七种技术计算存储的抽头值的相位校正值，并将该值应用于输入信号。

公开(公告)号：US4351060A

公开(公告)日：1982-09-21

申请号：US199904

申请日：1980-10-23

申请人： Robert Treiber

发明人： Robert Treiber

IPC分类号： H03H21/00 ,  H03H11/28 ,  H03H11/36 ,  H03H17/00 ,  H04B1/58 ,  H04B3/00 ,  H04B3/03 ,  H04B3/14 ,  H04B3/20 ,  H04B3/23 ,  H04L25/03 ,  H03H17/02

CPC分类号： H04B3/23 ,  H04B1/586 ,  H04L2025/03668

摘要： A circuit for automatically digitally synthesizing an output impedance, which may be a matching line terminating impedance, is provided. The means for establishing the desired output impedance characteristic is accomplished using a simplified recursive digital filter arrangement. In addition, means are provided for eliminating the effects of incidental undesirable shunting impedances.

摘要翻译： 提供用于自动数字合成输出阻抗的电路，其可以是匹配线路终端阻抗。 使用简化的递归数字滤波器布置来实现用于建立期望的输出阻抗特性的装置。 此外，提供了用于消除偶然的不期望的分流阻抗的影响的装置。