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    • 81. 发明授权
    • Energy based communication rate detection system and method
    • 基于能量的通信速率检测系统及方法
    • US06347080B2
    • 2002-02-12
    • US09150493
    • 1998-09-09
    • Yu-Cheun JouAmnon SilbergerJulien Nicolas
    • Yu-Cheun JouAmnon SilbergerJulien Nicolas
    • H04J116
    • H04B17/318H04B7/216
    • A system and method for the detection of zero-rate communication frames on forward and reverse communication links is described herein. In a first embodiment, the rate determination process begins upon receiving pilot and traffic channel signals. The system then compares the received traffic channel energy with the pilot signal to obtain a metric. The metric is then compared with a predetermined threshold to detect the presence of a zero-rate traffic channel frame. In a second embodiment, the process begins with the receipt of a reverse communication link frame having first and second portions. The system then detects the energy contained in the first and second portions. The system compares the detected energy in the first portion with the detected energy in the second portion to obtain a metric. The system then compares the metric with a predetermined threshold to detect the presence of the zero-rate frame. The selection of the predetermined threshold in both embodiments is based on the probability of detection of a transmitted zero-rate frame and the probability of erroneously detecting a zero-rate frame.
    • 本文描述了用于检测正向和反向通信链路上的零速率通信帧的系统和方法。 在第一实施例中,速率确定处理在接收到导频和业务信道信号后开始。 然后,系统将所接收的业务信道能量与导频信号进行比较以获得度量。 然后将度量与预定阈值进行比较以检测零速率业务信道帧的存在。 在第二实施例中,该过程开始于接收具有第一和第二部分的反向通信链路帧。 然后,系统检测包含在第一和第二部分中的能量。 该系统将检测到的第一部分的能量与第二部分中检测到的能量进行比较以获得度量。 然后,该系统将该度量与预定阈值进行比较,以检测零速率帧的存在。 在两个实施例中,预定阈值的选择基于检测到发送的零速率帧的概率和错误检测零速率帧的概率。
    • 84. 发明授权
    • Method and apparatus for testing a digital communication channel
    • 用于测试数字通信信道的方法和装置
    • US5802105A
    • 1998-09-01
    • US347526
    • 1994-11-30
    • Edward G. Tiedemann, Jr.Yu-Cheun JouLindsay A. Weaver, Jr.Gwain Bayley
    • Edward G. Tiedemann, Jr.Yu-Cheun JouLindsay A. Weaver, Jr.Gwain Bayley
    • H04L1/00H04B3/46H04B7/26H04B17/00H04L1/20H04L1/24H04L27/00H04L29/08H04L29/14
    • H04L1/20H04L1/241H04L1/242H04L2027/0034
    • A system and method for testing signal transmission quality within a digital communication system is disclosed herein. The system may be incorporated within a digital cellular communication system in which information is exchanged over spread spectrum communication channels, among a plurality of mobile users, via at least one cell-site. The system contemplates testing a digital communication channel by transmitting a test sequence of digital data over the communication channel. The test sequence of digital data transmitted over the communication channel is received at a receiving station, within which is also generated a replica of the test sequence of digital data. The accuracy of transmission over the communication channel is then determined by comparing the replica of the test sequence of digital data to the test sequence of data received over the communication channel. The system allows the test sequence of digital data to be transmitted at one of a set of known data rates, with the receive station being disposed to identify the data rate associated with each test sequence of digital data. In a preferred implementation transmission of the test sequence involves generating a first plurality of data packets, which collectively comprise the test sequence of digital data. Each data packet is assigned one of a multiplicity of data rates in accordance with a first pseudorandom process, and is then transmitted at the data rate assigned thereto.
    • 本文公开了一种用于测试数字通信系统内的信号传输质量的系统和方法。 该系统可以并入到数字蜂窝通信系统中,其中通过至少一个小区站点在多个移动用户之间通过扩频通信信道交换信息。 该系统考虑通过在通信信道上发送数字数据的测试序列来测试数字通信信道。 通过通信信道发送的数字数据的测试序列在接收站处被接收,在接收站中也产生数字数据的测试序列的副本。 然后通过将数字数据的测试序列的副本与通过通信信道接收的数据的测试序列进行比较来确定通信信道上的传输的准确性。 该系统允许数字数据的测试序列以一组已知数据速率中的一种传输,其中接收站被设置为识别与数字数据的每个测试序列相关联的数据速率。 在优选实施例中,测试序列的传输涉及生成第一多个数据分组,其共同地包括数字数据的测试序列。 每个数据分组根据第一伪随机过程分配多个数据速率中的一个,然后以分配给它的数据速率发送。
    • 85. 发明授权
    • Increasing capacity in wireless communications
    • 增加无线通信的容量
    • US09014152B2
    • 2015-04-21
    • US12424050
    • 2009-04-15
    • Yu-Cheun JouPeter J. BlackRashid Ahmed A. Attar
    • Yu-Cheun JouPeter J. BlackRashid Ahmed A. Attar
    • H04J3/00H04L12/43H04J3/24H04W52/44H04L1/16H04W52/58H04L1/00
    • H04W52/44H04B2201/709709H04L1/0002H04L1/0025H04L1/0027H04L1/0029H04L1/0045H04L1/1607H04L1/1854H04L1/1887H04L2001/0092H04W52/58
    • Techniques to increase capacity in a wireless communications system. Systematic non-transmission, or “blanking,” of minimal-rate frames transmitted in a communications system is provided. In an exemplary embodiment, eighth rate frames in a cdma2000 voice communications system are systematically substituted with null-rate frames carrying zero traffic bits. The receiver detects the presence of null rate or non-null rate transmissions and processes the received frames accordingly. Techniques for changing the pilot transmission gating pattern to assist the receiver in detecting null rate frames are provided. In another aspect, early termination of a signal transmission over a wireless communications link is provided. In an exemplary embodiment, a base station (BS) transmits power control groups (PCG's) for a frame over a forward link (FL) to a mobile station (MS) until accurate reception of the frame is acknowledged by the MS over a reverse link (RL), possibly before all PCG's of the frame are received.
    • 提高无线通信系统容量的技术。 提供了在通信系统中发送的最小速率帧的系统性非传输或“消隐”。 在示例性实施例中,cdma2000语音通信系统中的第八速率帧被系统地替换为带有零业务位的零速率帧。 接收机检测到零速率或非零速率传输的存在,并相应地处理接收到的帧。 提供了用于改变导频传输门控模式以辅助接收机检测零速率帧的技术。 在另一方面,提供了通过无线通信链路的信号传输的提前终止。 在示例性实施例中,基站(BS)通过前向链路(FL)向移动站(MS)发送用于帧的功率控制组(PCG),直到MS通过反向链路确认帧的准确接收 (RL),可能在所有PCG的帧被接收之前。
    • 87. 发明授权
    • Methods and apparatus for interference cancellation
    • 干扰消除的方法和装置
    • US08854944B2
    • 2014-10-07
    • US12614436
    • 2009-11-08
    • Yu-Cheun JouRashid A. AttarPeter J. Black
    • Yu-Cheun JouRashid A. AttarPeter J. Black
    • H04B1/10H04B1/7107
    • H04B1/7107H04B1/10
    • Disclosed are methods and apparatus for interference cancellation in a wireless communication system. In particular, the disclosed methods and apparatus provide for interference cancellation in a wireless device, including extending linear interference cancellation techniques, such as quasi-linear interference cancellation (QLIC), in the wireless device to a first orthogonal set, which may be a first quasi orthogonal function (QOF) set for a cdma2000 system to cancel interference from that set upon another desired QOF set. QLIC may also be extended to cancellation of signals from non-intended base stations as well. Accordingly, the present methods and apparatus afford reduced interference through QLIC by canceling signals due to either undesired QOF sets or non-intended base stations, which in turn results in an increase in forward link capacity.
    • 公开了一种用于无线通信系统中的干扰消除的方法和装置。 具体地,所公开的方法和装置提供无线设备中的干扰消除,包括将无线设备中的线性干扰消除技术(诸如准线性干扰消除(QLIC))扩展到第一正交集合,其可以是第一正交集合 为cdma2000系统设置的准正交函数(QOF),以消除来自该组的另一个所需QOF集的干扰。 也可以将QLIC扩展到从非预定基站消除信号。 因此,本方法和装置通过消除由于不期望的QOF组或非预期基站导致的信号,通过QLIC降低了干扰,这又导致前向链路容量的增加。