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    • 3. 发明授权
    • Time and bandwidth scalable slot for mobile data system
    • 移动数据系统的时间和带宽可扩展槽
    • US06721267B2
    • 2004-04-13
    • US09760984
    • 2001-01-16
    • Bradley M. HibenKevin G. DobersteinDonald G. NewbergRobert D. Logalbo
    • Bradley M. HibenKevin G. DobersteinDonald G. NewbergRobert D. Logalbo
    • H04J1100
    • H04W99/00H04L5/0007H04L5/0048H04L5/0051H04L5/0053H04W74/04
    • A scalable slot format defining positions of synchronization symbols, pilot symbols and data symbols for various numbers of sub-channels and various lengths of time in a multi-carrier communication system. An initial pattern (500) and one or more follow-on patterns (600, 700) are defined identifying positions of data symbols, synchronization symbols and pilot symbols for a first number of sub-channels corresponding to a first bandwidth. An extended pattern is constructed from the one or more follow-on patterns. The extension pattern is appended to the initial pattern to form a base pattern (810, 910, 1010). The base pattern (810, 910, 1010) is replicated zero or more times to form an expanded pattern (812, 910, 1015) identifying positions of data symbols, synchronization symbols and pilot symbols for an expanded number of sub-channels corresponding to a second bandwidth. The slot format may be implemented by a transmitter (100) having subdivided an original information signal into M bit streams and having encoded each of the M bit streams to 16QAM symbols to form M symbol streams, by inserting synchronization and pilot symbols into each of the M symbol streams at positions determined by the expanded pattern.
    • 在多载波通信系统中定义不同数量的子信道和不同时间长度的同步符号,导频符号和数据符号的位置的可扩展时隙格式。 定义初始模式(500)和一个或多个跟随模式(600,700),用于识别对应于第一带宽的第一数量子信道的数据符号,同步符号和导频符号的位置。 从一个或多个后续模式构建扩展模式。 扩展模式被附加到初始模式以形成基本模式(810,910,1010)。 基本模式(810,910,1010)被复制零次或更多次,以形成识别用于扩展数目的子信道对应的数据符号,同步符号和导频符号的位置的扩展模式(812,910,1015) 第二个带宽。 时隙格式可以由已经将原始信息信号细分为M个比特流并已通过将每个M比特流编码为16QAM符号以形成M个符号流来实现,通过将同步和导频符号插入到每个 M符号流在由扩展模式确定的位置处。
    • 4. 发明授权
    • Mechanism for repeater error mitigation
    • 中继器误差减轻机制
    • US5805612A
    • 1998-09-08
    • US524491
    • 1995-09-07
    • Donald G. NewbergBradley M. HibenRobert D. LoGalbo
    • Donald G. NewbergBradley M. HibenRobert D. LoGalbo
    • H04L1/00
    • H04L1/0057
    • An APCO 25 radio communication system 200 includes a repeater 101 arranged to receive signals from an inbound repeater link 103, thereby forming received signals. The repeater 101 is arranged to forward the received signals to a subscriber 121 via an outbound radio frequency path 113. The received signals include two types of packets, namely, packets 105 with correctable errors 107, and "erasure packets"109 with detectable-but-uncorrectable errors 111. The inbound repeater link is equipped with error correcting means 110 for correcting the correctable errors 107. The inbound repeater link is also equipped with error mitigating means 130 for mitigating the detectable-but-uncorrectable errors 111. The error mitigation is performed in accordance with the improved multi-band excitation ("IMBE") process.
    • APCO 25无线电通信系统200包括被布置成从入站中继器链路103接收信号的中继器101,从而形成接收信号。 中继器101被布置成经由出站射频路径113将接收到的信号转发给用户121.接收到的信号包括两种类型的分组,即具有可校正错误的分组105,以及具有可检测但是的“擦除分组”109 入站中继器链路配备有用于校正可校正错误107的错误校正装置110.入站中继器链路还配备有用于减轻可检测但不可校正的错误111的误差减轻装置130.错误减轻是 根据改进的多频带激励(“IMBE”)过程进行。
    • 5. 发明授权
    • Method and apparatus for modifying amplitude of at least one symbol
    • 用于修改至少一个符号的振幅的方法和装置
    • US5796784A
    • 1998-08-18
    • US624042
    • 1996-03-27
    • Robert D. LoGalboDonald G. NewbergBradley M. Hiben
    • Robert D. LoGalboDonald G. NewbergBradley M. Hiben
    • H04L27/34H04L27/36H04L27/20
    • H04L27/3488
    • In a modulator (300), a symbol weight determiner (301) determines a scaling factor (310) for at least one symbol (308). An integrator (303) and a complex symbol generator (305) operate to produce at least one complex symbol (314) based on the at least one symbol. The scaling factor (310) is used to scale the at least one complex symbol. In one embodiment, a scaler (307) comprises a gain-modifiable amplifier (609) and, in a second embodiment, the scaler comprises a gain-modifiable filter (809). When such a modulator is incorporated into an RF communication device (600, 800), the energy used to transmit any given symbol can be varied according to the relative importance of that symbol. Additionally, the overall received sensitivity of a communication, at a given signal strength, can be improved.
    • 在调制器(300)中,符号权重确定器(301)确定至少一个符号(308)的缩放因子(310)。 基于该至少一个符号,积分器(303)和复合符号发生器(305)操作以产生至少一个复合符号(314)。 缩放因子(310)用于缩放至少一个复合符号。 在一个实施例中,缩放器(307)包括可增益修改的放大器(609),并且在第二实施例中,缩放器包括增益可修改的滤波器(809)。 当这种调制器被并入RF通信设备(600,800)中时,用于发送任何给定符号的能量可以根据该符号的相对重要性而变化。 此外,可以提高在给定信号强度下的通信的总体接收灵敏度。