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公开(公告)号：US4057696A
公开(公告)日：1977-11-08
申请号：US712518
申请日：1976-08-09
摘要： The circuit complexity of a closed-loop echo cancellation system for use in a two-way communication circuit is reduced by employing a second adjustable signal processing network of the transversal type positioned in the control loop to emulate the characteristic of a recursive adjustable signal processing network. The two signal processing networks in the control loop are adjusted simultaneously to effect echo cancellation. The second signal processing network compensates for the effect of transmission poles in the echo return path and reduces the duration of the impulse response of the echo return path significantly so that the first signal processing network in the control loop is greatly simplified. A third signal processing network of the recursive type is adjusted in accordance with the internal settings of the second network to perform signal processing inverse to that of the second network. The recursive network is utilized to provide a clear signal path through the echo cancellation system which is essentially free of echo.
摘要翻译： 用于双向通信电路的闭环回波消除系统的电路复杂度通过采用位于控制环路中的横向类型的第二可调信号处理网络来减小递归可调信号处理网络的特性 。 控制回路中的两个信号处理网络被同时调整以实现回声消除。 第二信号处理网络补偿了回波返回路径中传输极的影响，并显着减少了回波返回路径脉冲响应的持续时间，从而大大简化了控制回路中的第一个信号处理网络。 根据第二网络的内部设置来调整递归类型的第三信号处理网络，以执行与第二网络相反的信号处理。 递归网络用于通过基本上没有回波的回波消除系统提供清晰的信号路径。
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公开(公告)号：US09826541B1
公开(公告)日：2017-11-21
申请号：US14755841
申请日：2015-06-30
CPC分类号： H04W72/1236
摘要： The present invention provides a novel rate adaptation algorithm and QoS-aware MAC scheduling system and method that either maximizes user satisfaction or maximizes spectrum utilization while maintaining user satisfaction by trading off the spectral resource allocations of connections for the application-level QoS based on the user-specific requirements. An adaptive scheduler is presented that incorporates user specific QoS requirements in the spectral allocation of resources.
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3.发明授权Power control and cell site location technique for CDMA systems with hierarchical architecture 有权具有层次结构的CDMA系统的功率控制和小区站点定位技术公开(公告)号：US06438379B1
公开(公告)日：2002-08-20
申请号：US09322941
申请日：1999-05-28
IPC分类号： H04Q736
CPC分类号： H04W52/343 , H04W16/06 , H04W16/32 , H04W52/346
摘要： Multiple microcell base stations are located within a macrocell having single macrocell base station in an hierarchical architecture, and microcell users (&mgr;-users) and macrocell users (M-users) communicate respectively with the &mgr;-base and the M-base using the same frequency band, by appropriately (a) selecting the ratio of the radius r of each &mgr; cell and the average distance d from the M-base (r and d are measured by the “radio distance”, which includes the effects of shadowing), and (b) controlling the power level with which uplink (mobile to base) and downlink (base to mobile) messages are communicated. Typically, &mgr;-cell size and location are chosen such that d/r>10. With respect to uplink communications, the transmit powers of the &mgr;-users in a &mgr;-cell are controlled so that the total received power at the nearest M-base is equivalent to the received power from C M-users, where C is usually set to unity. As a result, the M-cell basically loses C users worth of capacity, but the total number of users is increased by virtue of the additional &mgr;-users. With respect to downlink communications, as long as the microbase and the macrobase are coordinated systems, the &mgr;-base transmit power is controlled so that at the point of handoff between a &mgr;-base and M-base, the received power at a user from the two bases is equivalent, and the received power at the bases from this user is also equivalent. With this arrangement, the &mgr;-base transmit power is increased as r grows and d decreases in order for this balance to occur. Where the M-base and &mgr;-base have no knowledge of each other and handoffs are not allowed between the two base types, a family of I/Q short codes which are quasi-orthogonal to the existing short (pilot) codes are generated, and these codes are used to distinguish between the M-base and &mgr;-base signals.
摘要翻译： 多个微小区基站位于具有分层架构的单个宏小区基站的宏小区内，并且微小区用户（mu用户）和宏小区用户（M用户）分别与使用相同的基站和M基站进行通信 通过适当地（a）选择每个mu单元的半径r与来自M基的平均距离d（r和d由“无线电距离”测量，包括阴影效应）的比率， 和（b）控制通信的上行链路（移动台到基站）和下行链路（基站到移动）消息的功率电平。 通常，选择mu单元格大小和位置使得d / r> 10。 对于上行链路通信，mu单元中的mu用户的发送功率被控制，使得最接近的M-base处的总接收功率等于来自C M用户的接收功率，其中C通常设置 团结 结果，M-cell基本上损失了C用户的容量，但是由于其他的mu用户，用户总数增加了。 对于下行链路通信，只要微基站和宏基站是协调系统，则控制mu基发射功率，使得在mu基和M基之间的切换点处，用户的接收功率 两个基地是等效的，并且从该用户的基地接收的功率也是等效的。 通过这种布置，随着r增长，mu基传输功率增加，d减小，以使得该平衡发生。 在M基和mu基不相互之间，两基类之间不允许切换的情况下，产生与现有短（导频）码准正交的一系列I / Q短码， 这些码用于区分M基和M基信号。
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公开(公告)号：US09451890B2
公开(公告)日：2016-09-27
申请号：US14801514
申请日：2015-07-16
申请人： Richard Dennis Gitlin , Gabriel Eduardo Arrobo , Peter Jeffrey Fabri , Thomas Petter Ketterl , Calvin Perumalla
发明人： Richard Dennis Gitlin , Gabriel Eduardo Arrobo , Peter Jeffrey Fabri , Thomas Petter Ketterl , Calvin Perumalla
CPC分类号： A61B5/04011 , A61B5/0006 , A61B5/04028 , A61B5/742 , A61B2560/0468 , A61N1/36514 , A61N1/37235 , A61N1/37288 , A61N1/3756 , A61N1/3962
摘要： An integrated vectorcardiogram (VCG) device having 3 pairs of electrodes placed in three orthogonal directions with the capability to continuously measure the electrical activity of the heart. All of the electrode pairs may be contained within a single miniaturized housing thereby eliminating the need for cumbersome wires required with current 12-lead ECG systems, while providing the same amount and quality of information as the 12-lead ECG system. The integrated VCG device also includes a communications function to allow the data collected by the electrodes to be transmitted wirelessly to a remote device, such as a pacemaker, to control its function or to a remote monitoring station for continuous real-time patient monitoring.
摘要翻译： 具有放置在三个正交方向上的具有3对电极的综合矢量心电图（VCG）装置，具有连续测量心脏电活动的能力。 所有电极对可以包含在单个小型化的外壳内，从而消除对当前12导联ECG系统所需的麻烦的电线的需要，同时提供与12导联ECG系统相同数量和质量的信息。 集成VCG设备还包括通信功能，以允许电极收集的数据被无线地传输到诸如起搏器的远程设备，以控制其功能，或者向远程监控站进行连续实时的患者监测。
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公开(公告)号：US5953331A
公开(公告)日：1999-09-14
申请号：US925876
申请日：1997-09-09
申请人： Thomas Duncan , Richard Dennis Gitlin , Thomas F. La Porta , Kazutaka Murakami , Krishan Kumar Sabnani , Anil S. Sawkar , David E. Smith
发明人： Thomas Duncan , Richard Dennis Gitlin , Thomas F. La Porta , Kazutaka Murakami , Krishan Kumar Sabnani , Anil S. Sawkar , David E. Smith
CPC分类号： H04W88/181
摘要： A telecommunications system is arranged to efficiently route digital information from a mobile network to a Public Switched Telephone Network (PSTN) and vice versa by interposing a packet network between the mobile network and PSTN so that digital information originating from the wireless network at a first data rate may be forwarded over the packet network at that rate and then sent over a direct connection from the packet network to the PSTN at a second data rate expected by the PSTN. In this way the conversion of the digital information from the first to the second data rate is performed only when needed, i.e., at the ATM switch connected to the PSTN.
摘要翻译： 电信系统被布置为通过在移动网络和PSTN之间插入分组网络来有效地将数字信息从移动网络路由到公共交换电话网（PSTN），反之亦然，使得以第一数据来自无线网络的数字信息 速率可以以该速率通过分组网络转发，然后以由PSTN预期的第二数据速率通过直接连接从分组网络发送到PSTN。 以这种方式，数字信息从第一数据速率到第二数据速率的转换仅在需要时进行，即在连接到PSTN的ATM交换机上进行。
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6.发明授权Code division multiple access system providing variable data rate access to a user 失效码分多址系统为用户提供可变数据速率访问
公开(公告)号：US5856971A
公开(公告)日：1999-01-05
申请号：US504481
申请日：1995-07-20
申请人： Richard Dennis Gitlin , Chih-Lin I
发明人： Richard Dennis Gitlin , Chih-Lin I
IPC分类号： H04B1/707 , H04B7/005 , H04B7/26 , H04J11/00 , H04J13/00 , H04J13/10 , H04J13/18 , H04J99/00 , H04L1/00 , H04L1/08
CPC分类号： H04L1/0041 , H04B7/264 , H04J13/0048 , H04J13/107 , H04J13/18 , H04L1/0022 , H04L1/08 , H04B2201/70705 , H04L1/0059 , H04L1/0071 , H04W52/26
摘要： A multi-code code division multiple access system allows a user at a radio transmitter unit to dynamically change its source data bit rate. In response to a user input selecting one of said plurality of source bit rates, an adjustable coding means in the transmitter spreads and transmits the user's digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates. The plurality of source bit rates includes a basic bit rate R and at least one bit rate which is a multiple M of the basic bit rate R, where M is an integer of at least 1. The user's input selects a particular user source bit rate by identifying a basic bit rate multiple M to a base station that is to receive the transmission.
摘要翻译： 多码分码多址系统允许无线电发射机单元的用户动态地改变其源数据比特率。 响应于选择所述多个源比特率之一的用户输入，发射机中的可调节编码装置将以所选比特率接收的用户数字比特流扩展并发送至至少等于最高比特率的信道比特率 的所述多个源比特率。 多个源比特率包括基本比特率R和至少一个比特率，其是基本比特率R的多M，其中M是至少为1的整数。用户的输入选择特定用户源比特率 通过向要接收传输的基站识别基本位速率M M。
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公开(公告)号：US4021738A
公开(公告)日：1977-05-03
申请号：US662528
申请日：1976-03-01
CPC分类号： H04L25/03057 , H04L25/03038 , H04L25/03133
摘要： An automatic and adaptive time-domain equalizer with a first transversal structure operating on received signal samples has its convergence properties improved by the addition of a second transversal structure operating on detected signal samples and having its tap-gain settings conjugate, i.e., reversed in time, with respect to those of the first transversal structure for effectively measuring the spread of tap gain values generated at the first transversal structure and a third transversal structure also operating on received signal samples but having its tap-gain settings determined by the spreading error. The matrix product of the spreading-error tap-gain values and received signal samples modifies the up-dating of the tap-gain values controlling the first transversal structure. The resultant faster convergence is particularly useful in the presence of severe amplitude distortion in the data transmission channel.
摘要翻译： 具有在接收信号样本上操作的第一横向结构的自动和自适应时域均衡器具有通过添加对检测到的信号样本进行操作并具有其抽头增益设置共轭的第二横向结构来改善其收敛特性，即时间反转 相对于用于有效测量在第一横向结构处产生的抽头增益值的扩展的第一横向结构的第一横向结构，以及也在接收信号样本上操作但具有由扩展误差确定的抽头增益设置的第三横向结构。 扩展误差抽头增益值和接收信号样本的矩阵积修改控制第一横向结构的抽头增益值的跟踪。 在数据传输通道中存在严重幅度失真的情况下，所得到的更快的收敛特别有用。
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公开(公告)号：US10327123B1
公开(公告)日：2019-06-18
申请号：US16104412
申请日：2018-08-17
IPC分类号： H04W4/70 , H04L12/66 , H04B7/0413 , H04L29/08
摘要： A system and method for Machine-to-Machine (M2M) communication over a transmission medium, including a novel random access protocol that is easy to implement, energy efficient, scalable and compatible with the limited-power and low complexity requirements of IoT devices. The proposed protocol utilizes a form of multiple hypothesis testing at the IoT gateway to determine the number of active IoT devices operating in the transmission medium to optimize the power levels of a Successive Interference Cancellation (SIC) receiver in order to distinguish between signals transmitted from different IoT devices on the same time and frequency. The use of beamforming exploits the power and spatial domains without excessively increasing the SIC power levels and address channel access delay problems by reducing the probability of collision and consequently lowering the average back-off delay.
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公开(公告)号：US09749086B1
公开(公告)日：2017-08-29
申请号：US15198490
申请日：2016-06-30
CPC分类号： H04K3/84 , H04K3/43 , H04L5/0048 , H04W12/08 , H04W12/12
摘要： In various embodiments, the present invention presents a physical layer (PHY) authentication technique for implantable medical devices (IMDs) that does not use existing methods of cryptology. Instead, a friendly jamming mechanism is established and malicious attempts by adversaries are prevented, without sharing any secured information, such as secret keys. In addition to ensuring authentication, the invention also provides advantages in terms of decreasing processing complexity of IMDs and enhances overall communications performance.
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10.发明授权Methods and apparatus for reducing cochannel interference in a mixed-rate communication system 有权用于减少混合速率通信系统中的同信道干扰的方法和装置公开(公告)号：US06188718B1
公开(公告)日：2001-02-13
申请号：US09138465
申请日：1998-08-21
IPC分类号： H04B110
CPC分类号： H04W52/267 , H04B1/7107
摘要： A method and apparatus for increasing system capacity in a mixed-rate wireless communication are disclosed. Improvements are obtained using multiuser detection or antenna array processing techniques or both to explicitly cancel or attenuate only the high power users. Multiuser detection may be combined with antenna array processing to recover capacity appropriated by the high-power users. By mitigating the interference effects of only the high-powered users, the computational burden is manageable. An antenna array algorithm or a multiuser detection algorithm or both, are applied only to n high rate users (n
摘要翻译： 公开了一种用于在混合速率无线通信中增加系统容量的方法和装置。 使用多用户检测或天线阵列处理技术或者仅仅显式地取消或衰减高功率用户来获得改进。 多用户检测可以与天线阵列处理相结合，以恢复高功率用户所适用的容量。 通过减轻只有大功率用户的干扰影响，计算负担是可控的。 天线阵列算法或多用户检测算法或两者都仅应用于n个高速率用户（n
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