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    Power control and cell site location technique for CDMA systems with hierarchical architecture
    1.
    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

    申请人： Richard Dennis Gitlin ,  Howard C. Huang ,  Rajeev Krishnamoorthy ,  Reinaldo A. Valenzuela

    发明人： Richard Dennis Gitlin ,  Howard C. Huang ,  Rajeev Krishnamoorthy ,  Reinaldo A. Valenzuela

    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。

    Methods and apparatus for reducing cochannel interference in a mixed-rate communication system
    2.
    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

    申请人： Richard Dennis Gitlin ,  Howard C. Huang ,  Laurence Eugene Mailaender ,  Reinaldo A. Valenzuela

    发明人： Richard Dennis Gitlin ,  Howard C. Huang ,  Laurence Eugene Mailaender ,  Reinaldo A. Valenzuela

    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

    Recursive-like adaptive echo canceller
    4.
    发明授权
    Recursive-like adaptive echo canceller 失效
    递归式自适应回波消除器

    公开(公告)号：US4057696A

    公开(公告)日：1977-11-08

    申请号：US712518

    申请日：1976-08-09

    申请人： Richard Dennis Gitlin ,  John Stewart Thompson

    发明人： Richard Dennis Gitlin ,  John Stewart Thompson

    IPC分类号： H04B3/23 ,  H04L5/14 ,  H04B3/20

    CPC分类号： H04L5/14 ,  H04B3/23

    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。

    Code division multiple access system providing variable data rate access to a user
    7.
    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。

    Adaptive equalizer with fast convergence properties
    8.
    发明授权
    Adaptive equalizer with fast convergence properties 失效
    具有快速收敛性的自适应均衡器

    公开(公告)号：US4021738A

    公开(公告)日：1977-05-03

    申请号：US662528

    申请日：1976-03-01

    申请人： Richard Dennis Gitlin ,  Francis Robert Magee, Jr.

    发明人： Richard Dennis Gitlin ,  Francis Robert Magee, Jr.

    IPC分类号： H04L25/03 ,  H04B1/10

    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。

    System and method for machine-to-machine communication in an internet-of-things network
    9.
    发明授权
    System and method for machine-to-machine communication in an internet-of-things network 有权

    公开(公告)号：US10327123B1

    公开(公告)日：2019-06-18

    申请号：US16104412

    申请日：2018-08-17

    申请人： Richard Dennis Gitlin ,  Mohamed Elkourdi ,  Asim Mazin

    发明人： Richard Dennis Gitlin ,  Mohamed Elkourdi ,  Asim Mazin

    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.