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1. 发明授权

US06571083B1 Method and apparatus for automatic simulcast correction for a correlation detector 失效
标题翻译：用于相关检测器的自动联播校正的方法和装置
公开(公告)号：US06571083B1
公开(公告)日：2003-05-27
申请号：US09306663
申请日：1999-05-05
申请人： Clinton C Powell, II , James David Hughes , Chun-Ye Susan Chang , Christopher T. Thomas , Mahibur Rahman , Edgar Herbert Callaway, Jr. , James A. Kimball
发明人： Clinton C Powell, II , James David Hughes , Chun-Ye Susan Chang , Christopher T. Thomas , Mahibur Rahman , Edgar Herbert Callaway, Jr. , James A. Kimball
IPC分类号： H04B100
CPC分类号： H04W88/022
摘要： An automatic simulcast correction method (300) for a selective call receiver (100) includes the steps of measuring a received signal (304) for a received signal strength indication measurement and then determining if a protocol indicates a simulcast signal (310). If the received signal strength indication measurement is above a predefined threshold and the protocol indicates the simulcast signal, then the selective call receiver is optimized for simulcast delay spread distortion (312). If the received signal strength indication measurement is below a predefined threshold or the protocol does not indicate the simulcast signal, then the selective call receiver is optimized for static sensitivity (314).
摘要翻译：用于选呼接收机（100）的自动同步播放校正方法（300）包括以下步骤：测量接收信号强度指示测量的接收信号（304），然后确定协议是否指示同播信号（310）。如果接收到的信号强度指示测量值高于预定阈值，并且协议指示同播信号，则选择呼叫接收机被优化用于联播延迟扩展失真（312）。如果接收到的信号强度指示测量值低于预定阈值，或该协议不指示同播信号，则选择呼叫接收机针对静态灵敏度进行了优化（314）。

2. 发明授权

US06853693B1 Method and apparatus for gain normalization of a correlation demodulator 有权
标题翻译：相关解调器增益归一化的方法和装置
公开(公告)号：US06853693B1
公开(公告)日：2005-02-08
申请号：US09560967
申请日：2000-04-28
申请人： Christopher T. Thomas , Chun-Ye Susan Chang , Clinton C Powell, II
发明人： Christopher T. Thomas , Chun-Ye Susan Chang , Clinton C Powell, II
IPC分类号： H04L7/04 , H04L27/156 , H04L27/38 , H04L27/06 , H03K9/00
CPC分类号： H04L27/156 , H04L7/042 , H04L27/3809
摘要： A correlation demodulator unit (20) having gain normalization includes a correlation demodulator (12) for receiving a signal from a receiver (8). The correlation demodulator has a plurality of correlators (C1-CN) corresponding to a plurality of N correlator outputs. A gain normalizer (15) is coupled to the correlation demodulator for accumulating symbol energy on a symbol by symbol basis for each of the plurality of correlator outputs based upon a current symbol decision providing at least an accumulated value within an accumulator (43) for the plurality of correlators and for normalizing the plurality of N correlator outputs using the accumulated value(s).
摘要翻译：具有增益归一化的相关解调器单元（20）包括用于从接收器（8）接收信号的相关解调器（12）。相关解调器具有对应于多个N个相关器输出的多个相关器（C1-CN）。增益归一化器（15）被耦合到相关解调器，用于基于当前符号判定提供每个符号基础的符号基础累积符号能量，所述当前符号决定至少提供累加器（43）内的累积值，用于多个相关器，并且使用累积值对多个N个相关器输出进行归一化。

3. 发明授权

US06487260B1 Method and apparatus for efficient correlation detection 有权
标题翻译：用于高效相关检测的方法和装置
公开(公告)号：US06487260B1
公开(公告)日：2002-11-26
申请号：US09285977
申请日：1999-04-05
申请人： Robert K. Schweickert , Mahibur Rahman , Christopher T. Thomas , Clinton C Powell, II
发明人： Robert K. Schweickert , Mahibur Rahman , Christopher T. Thomas , Clinton C Powell, II
IPC分类号： H04L2706
CPC分类号： H04L27/148
摘要： A full serial implementation of a M-level correlation based demodulator (100) includes a two's complement, pass-through, zero-out complex conjugate multiplier element (102), a boxcar filter (104) coupled to the multiplier element, a complex magnitude approximater element (106) coupled to the boxcar filter and a maximum value and index holding element (108). The multiplier element reuses common products along an M-level of cross-correlation to reduce multiplication functions at a rate 2 times M faster than a sampling rate at an input of the demodulator.
摘要翻译：基于M电平相关的解调器（100）的完整串行实现包括二进制补码，直通，零输出复共轭乘数元素（102），耦合到乘法器元件的箱式滤波器（104），复数量级耦合到箱式过滤器的近似元件（106）和最大值和指标保持元件（108）。乘法器元件沿着互相关的M级重复使用公共产品，以比解调器的输入端的采样速率快2倍的速率来减少乘法函数。

4. 发明授权

US06560447B2 DC offset correction scheme for wireless receivers 有权
公开(公告)号：US06560447B2
公开(公告)日：2003-05-06
申请号：US09798216
申请日：2001-03-05
申请人： Mahibur Rahman , Christopher T. Thomas , Robert Schweickert , James Mittel , Clinton C. Powell, II
发明人： Mahibur Rahman , Christopher T. Thomas , Robert Schweickert , James Mittel , Clinton C. Powell, II
IPC分类号： H04B106
CPC分类号： H04B1/30 , H03D3/006 , H03D7/161 , H04L25/061
摘要： A DC offset correction circuit (68) provides DC offset correction within a receiver (50) for receiving and processing a radio frequency signal (28) within a radio communication system (30). The DC offset correction circuit (68) includes a feedback loop (88) for shifting a digital signal (80) by a programmable amount; and a coarse DC offset correction path (104) coupled to the feedback loop (88) for performing coarse DC offset correction.

5. 发明授权

US06275500B1 Method and apparatus for dynamic control of talk groups in a wireless network 有权
标题翻译：无线网络中通话组动态控制的方法和装置
公开(公告)号：US06275500B1
公开(公告)日：2001-08-14
申请号：US09370539
申请日：1999-08-09
申请人： Edgar Herbert Callaway, Jr. , Christopher T. Thomas
发明人： Edgar Herbert Callaway, Jr. , Christopher T. Thomas
IPC分类号： H04L1242
CPC分类号： H04W74/06 , H04W84/18
摘要： A transceiver device (50) acting as a master (2) among a plurality of communication devices (1 and 12) potentially acting as slaves to the master (2). The transceiver device (50) includes a transmitter (68), a receiver (54) coupled to the transmitter (68), and a processor (58) coupled to the transmitter (68) and the receiver (54). The processor (58) is programmed to poll the slaves at a first interval and then receive a communication request while polling from a first slave of the plurality of communication devices to communicate with at least a second slave of the plurality of communication devices. The master (2) then designates communication parameters for communication between the first slave and at least the second slave and then polls at a re-polling interval the first slave and at least the second slave to confirm the termination of communication between the first slave and at least the second slave.
摘要翻译：在可能充当主机（2）的从站的多个通信设备（1和12）中用作主机（2）的收发机设备（50）。收发器设备（50）包括发射器（68），耦合到发射器（68）的接收器（54）和耦合到发射器（68）和接收器（54）的处理器（58）。处理器（58）被编程为以第一间隔轮询从站，然后在从多个通信设备中的第一从站轮询时接收通信请求，以与多个通信设备中的至少第二从站通信。主（2）然后指定用于第一从机和至少第二从机之间的通信的通信参数，然后以重新轮询间隔轮询第一从机和至少第二从机以确认第一从机和第二从机之间的通信的终止至少第二个奴隶。

6. 发明授权

US06470365B1 Method and architecture for complex datapath decimation and channel filtering 有权
标题翻译：复杂数据路径抽取和信道过滤的方法和架构
公开(公告)号：US06470365B1
公开(公告)日：2002-10-22
申请号：US09378932
申请日：1999-08-23
申请人： Mahibur Rahman , Christopher T. Thomas
发明人： Mahibur Rahman , Christopher T. Thomas
IPC分类号： G06F1710
CPC分类号： H03H17/0664 , H03H17/0671 , H03H2218/04
摘要： A decimation and channel filter (100 or 23) in an oversampled system includes a combined decimation and channel filtering architecture for simultaneously processing in-phase and quadrature phase complex input signals. A decimation filter (24) of the combined decimation and channel filter provides sampled outputs to a memory (108) to provide an intermediate result (604), which is stored in the memory (108) in a first format (608). A channel filter (26) of the combined decimation and channel filter processes (610) a decimation final result of the decimation filter in a second format in the memory to provide a final result. This architecture minimizes cost and current drain in a complex signal path decimation and channel filtering process. In addition, a channel filtering algorithm is used to ideally minimize current drain by a factor of 2.
摘要翻译：过采样系统中的抽取和信道滤波器（100或23）包括用于同时处理同相和正交相位复数输入信号的组合抽选和信道滤波架构。组合抽取和通道滤波器的抽取滤波器（24）向存储器（108）提供采样输出以提供以第一格式（608）存储在存储器（108）中的中间结果（604）。组合抽取和通道滤波器的通道滤波器（26）处理（610）存储器中第二格式的抽取滤波器的抽取最终结果，以提供最终结果。该架构在复杂信号路径抽取和信道滤波过程中最大限度地降低了成本和电流消耗。此外，使用信道滤波算法将电流消耗理想地最小化为2倍。

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