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    • 4. 发明授权
    • Method and apparatus for organizing and scheduling multimedia data transfers over a wireless channel
    • 通过无线信道组织和调度多媒体数据传输的方法和装置
    • US07002985B2
    • 2006-02-21
    • US09760985
    • 2001-01-16
    • Gregory A. DertzAlan P. ConradRobert D. LoGalboJohn B. PrestonTyrone D. BekiaresDonald G. Newberg
    • Gregory A. DertzAlan P. ConradRobert D. LoGalboJohn B. PrestonTyrone D. BekiaresDonald G. Newberg
    • H04L12/43
    • H04W72/1242
    • A radio frequency communications system (100) includes wireless terminals (102) and base sites (104). The wireless terminals communicate with the base sites over a radio frequency channel (106). The base sites are interconnected to each other and other network elements via a packet network. The communication system has a radio frequency channel (400) with time slots (406, 408) for transmission of both delay-sensitive data, such as streaming audio and video, and non-delay-sensitive data. A method and apparatus are provided for determining whether a time slot in the radio frequency channel is to be allocated to delay-sensitive data or non-delay-sensitive data (704, 706, 708). Each packet of data transmitted over the wireless channel has a type of service field (900). The type of service field has a precedence or priority value (902) and a service type (904). The priority values are used to determine which packet should be transmitted across the radio frequency channel next and the service type determines the transmission protocol.
    • 射频通信系统(100)包括无线终端(102)和基站(104)。 无线终端通过射频信道(106)与基站通信。 基站经由分组网络彼此互连和其它网络元件。 通信系统具有用于传输诸如流式音频和视频之类的延迟敏感数据以及非延迟敏感数据的具有时隙(406,408)的射频信道(400)。 提供一种方法和装置,用于确定射频信道中的时隙是否被分配给延迟敏感数据或非延迟敏感数据(704,706,708)。 通过无线信道发送的每个数据分组具有一种服务字段(900)。 服务类型具有优先级或优先权值(902)和服务类型(904)。 优先级值用于确定哪个分组应在下一个射频信道上传输,业务类型决定传输协议。
    • 8. 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。
    • 9. 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。