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公开(公告)号：US07592878B2
公开(公告)日：2009-09-22
申请号：US11696875
申请日：2007-04-05
IPC分类号： H03L1/00
CPC分类号： H03L1/022 , H03B5/06 , H03B5/1265 , H03B2200/0066 , H03B2200/0094 , H03L3/00 , H04B2001/6908
摘要： An apparatus for generating an oscillating signal that includes a circuit to accelerate the time in which an oscillating signal reaches a defined steady-state condition from a cold start. The apparatus includes an oscillating circuit to generate an oscillating signal; a first circuit to supply a first current to the oscillating circuit; and a second circuit to supply a second current to the oscillating circuit, wherein the first and second currents are adapted to reduce the time duration for the oscillating signal to reach a defined steady-state condition. The apparatus may be useful in communication systems that use low duty cycle pulse modulation to establish one or more communications channels, whereby the apparatus begins generating an oscillating signal at approximately the beginning of the pulse and terminates the oscillating signal at approximately the end of the pulse.
摘要翻译： 一种用于产生振荡信号的装置，其包括用于加速从冷启动振荡信号达到确定的稳态状态的时间的电路。 该装置包括产生振荡信号的振荡电路; 向振荡电路提供第一电流的第一电路; 以及向振荡电路提供第二电流的第二电路，其中第一和第二电流适于减小振荡信号达到所定义的稳态条件的持续时间。 该装置在使用低占空比脉冲调制以建立一个或多个通信信道的通信系统中可能是有用的，由此该装置在大约开始的脉冲处开始产生振荡信号，并在脉冲的大致末端终止振荡信号 。
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公开(公告)号：US07515580B2
公开(公告)日：2009-04-07
申请号：US10866296
申请日：2004-06-10
IPC分类号： H04J3/24
CPC分类号： H04W52/24 , H04W52/26 , H04W52/267 , H04W52/286 , H04W68/00 , H04W72/1231
摘要： In a data communication system capable of variable rate transmission, the data rate is determined by the largest C/I measurement of the forward link signals as measured at the Access Terminal. In one embodiment, the data transmission is scheduled based on an Access Terminal initiated forward power control, which reduces forward link rate quantization loss due to excess transmit power. The Access Terminal reports to the Access Point the excess C/I estimate for the selected rate. The Access Point then reduces its transmit power by an appropriate amount when serving that Access Terminal. In another embodiment, the data transmission is scheduled based on an Access Point initiated forward power control. The Access Point varies its transmit power over time either randomly or in synchronism with neighboring Access Points in the communication system, which enables an increase in the throughput achieved by users that receive a significant amount of interference.
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53.发明授权Method and apparatus for performing mobile assisted hard handoff between communication systems 有权用于在通信系统之间执行移动辅助硬切换的方法和装置公开(公告)号：US06810254B2
公开(公告)日：2004-10-26
申请号：US09946910
申请日：2001-09-04
IPC分类号： H04Q722
CPC分类号： H04W36/0094 , H04W36/0061 , H04W36/0066 , H04W36/14 , H04W36/30 , Y02D70/00
摘要： A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.
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54.发明授权Method and apparatus for controlling transmission power in a potentially transmission gated or capped communication system 有权用于控制潜在传输门控或封顶通信系统中的发射功率的方法和装置公开(公告)号：US06373823B1
公开(公告)日：2002-04-16
申请号：US09239454
申请日：1999-01-28
申请人： Tao Chen , Jack M. Holtzman , Keith Saints , Charles E. Wheatley, III , Fuyun Ling , Nagabhushana Sindhushayana
发明人： Tao Chen , Jack M. Holtzman , Keith Saints , Charles E. Wheatley, III , Fuyun Ling , Nagabhushana Sindhushayana
IPC分类号： H04J314
摘要： A power control system for controlling the transmission power in a system wherein the transmission power may be gated or capped. The receiver employs a combination of closed loop and outer loop power control. The outer loop is frozen upon detection by the receiver that the signal has been capped or gated.
摘要翻译： 一种用于控制系统中的发射功率的功率控制系统，其中发射功率可以选通或加盖。 接收机采用闭环和外环功率控制的组合。 接收机检测到外部环路信号已被封顶或门控时被冻结。
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公开(公告)号：US5722053A
公开(公告)日：1998-02-24
申请号：US683004
申请日：1996-07-16
IPC分类号： H04B1/40 , H04B1/38 , H04B7/005 , H04B7/12 , H04B7/208 , H04B7/26 , H04J1/04 , H04L1/04 , H04L5/06 , H04Q11/02 , H04W36/14 , H04W36/18 , H04B1/50
摘要： The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.
摘要翻译： 本发明的双频带码分多址无线电在传输或接收的同时在多个频率上工作。 发射路径通过分离发射中频（IF）路径（103）并使用两个频率合成器（140和145）将IF混合到两个不同的发射频率来操作。 接收路径（104）具有与由合成器（140和145）生成的频率混合的两个RF信道（116和117）并且相加到一个IF条带中。 因此，本发明的无线电装置可以同时在与两个基站通信的同时执行软切换。 如果需要同时与两个以上的基站进行通信，则可以添加其他混合路径和合成器。
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公开(公告)号：US5577265A
公开(公告)日：1996-11-19
申请号：US351853
申请日：1994-12-07
摘要： A system for mitigating the effect of fading in a digital communication system. Deep signal nulls occur when signals from multiple paths are precisely aligned in amplitude and phase canceling the signal at the receiving antenna and creating a fade. In an indoor system, moving either transmitter or receiver a short distance can shift a fade away from the frequency of interest. This invention provides an actual or perceived movement of an antenna such that the effects of fading can be averaged over a time interval. The signal processing capability of modern digital transceivers can correct errors due to the time varying fades using the present invention. Thus, a dual-antenna element using the system of this invention can provide diversity receive and transmit paths to maintain capacity. The present invention may also provide improved capacity to due enhanced stability in power control.
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57.发明授权
公开(公告)号：US5469471A
公开(公告)日：1995-11-21
申请号：US190517
申请日：1994-02-01
CPC分类号： H04W52/226 , H04W52/225 , H04W52/54
摘要： A link quality improvement system for a cellular communication system in which portable units are used to facilitate communication of information signals between system users, via at least one cell-site, using code division multiple access spread spectrum communication signals. The system enables users to improve the quality of reverse communication links from the portable units to the cell-site by providing to each system user a link quality signal indicative of power received at the cell-site relative to an optimum level of received power. At a cell-site communicating with a portable unit associated with a particular system user, the portable unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the portable unit for adjusting portable unit transmitter power. The command signals are also accumulated in order to enable generation of a link quality signal in response thereto. In a preferred implementation the link quality signal is an audible interference signal inducing the system user to adjust orientation of the portable communication unit so as to improve signal quality on the reverse link.
摘要翻译： 一种用于蜂窝通信系统的链路质量改进系统，其中使用便携式单元来通过至少一个小区站点使用码分多址扩展频谱通信信号促进系统用户之间的信息信号的通信。 该系统使用户能够通过向每个系统用户提供指示在小区站点处相对于接收功率的最佳等级接收的功率的链路质量信号来提高从便携式设备到小区站点的反向通信链路的质量。 在与与特定系统用户相关联的便携式单元进行通信的小区站点处，便携式单元发射功率是在小区现场接收的。 在小区站点生成指令信号并发送到便携式单元，用于调节便携式单元发射机功率。 还累积了命令信号，以便响应于此产生链路质量信号。 在优选实施例中，链路质量信号是可听干扰信号，引起系统用户调整便携式通信单元的方位，从而提高反向链路上的信号质量。
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58.发明授权Antenna system for multipath diversity in an indoor microcellular communication system 失效用于室内微蜂窝通信系统中多径分集的天线系统
公开(公告)号：US5437055A
公开(公告)日：1995-07-25
申请号：US72640
申请日：1993-06-03
摘要： A system for mitigating the effect of fading in a digital communication system. Deep signal nulls occur when signals from multiple paths are precisely aligned in amplitude and phase canceling the signal at the receiving antenna and creating a fade. In an indoor system, moving either transmitter or receiver a short distance can shift a fade away from the frequency of interest. This invention provides an actual or perceived movement of an antenna such that the effects of fading can be averaged over a time interval. The signal processing capability of modern digital transceivers can correct errors due to the time varying fades using the present invention. Thus, a dual-antenna element using the system of this invention can provide diversity receive and transmit paths to maintain capacity. The present invention may also provide improved capacity to due enhanced stability in power control.
摘要翻译： 一种用于减轻数字通信系统中衰落影响的系统。 当来自多个路径的信号在幅度上精确地对准并且相位消除接收天线处的信号并产生衰落时，会产生深度信号零点。 在室内系统中，将发射器或接收器移动一短距离可以将偏离偏离感兴趣的频率。 本发明提供天线的实际或感知的移动，使得可以在一段时间间隔内对衰落的影响进行平均。 现代数字收发器的信号处理能力可以通过使用本发明来校正由于时变渐变造成的误差。 因此，使用本发明的系统的双天线元件可以提供分集接收和发送路径以维持容量。 本发明还可以提供改善的功率，从而提高功率控制的稳定性。
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公开(公告)号：US4646032A
公开(公告)日：1987-02-24
申请号：US191648
申请日：1980-09-22
IPC分类号： H03B29/00
CPC分类号： H03B29/00
摘要： Method and apparatus for varying the output signal frequency of a controlled oscillator. The oscillator control signal is formed by filtering the output of a random number generator in such a way that the oscillatory output signal has a random frequency walk phase characteristic having predetermined, controlled characteristics.
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公开(公告)号：US08477742B2
公开(公告)日：2013-07-02
申请号：US12772792
申请日：2010-05-03
IPC分类号： H04W56/00
CPC分类号： H04W56/002 , H04B7/2668 , H04B2201/70702 , H04W56/001 , H04W56/0015 , H04W56/0045 , H04W92/20
摘要： Schemes to time-align transmissions from multiple base stations to a terminal. To achieve time-alignment, differences between the arrival times of transmissions from the base stations, as observed at the terminal, are determined and provided to the system and used to adjust the timing at the base stations such that terminal-specific radio frames arrive at the terminal within a particular time window. In one scheme, a time difference between two base stations is partitioned into a frame-level time difference and a chip-level time difference. Whenever requested to perform and report time difference measurements, the terminal measures the chip-level timing for each candidate base station relative to a reference base station. Additionally, the terminal also measures the frame-level timing and includes this information in the time difference measurement only if required. Otherwise, the terminal sets the frame-level part to a predetermined value (e.g., zero).
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