公开(公告)号：US6160799A

公开(公告)日：2000-12-12

申请号：US709432

申请日：1996-09-06

申请人： David J. Krause ,  Brian D. Storm ,  William F. Taranowski ,  Michael A. Eberhardt

发明人： David J. Krause ,  Brian D. Storm ,  William F. Taranowski ,  Michael A. Eberhardt

IPC分类号： H04W36/18 ,  H04W48/16 ,  H04Q7/38

CPC分类号： H04W36/18 ,  H04W48/16

摘要： An apparatus (100) maintains a Pilot Set in a digital communication system that utilizes Code Division Multiple Access. The apparatus comprises a logic and control circuit (113) for providing instructions to a searcher receiver (109). The searcher receiver, in response to the instructions, sequentially scans active pilots, then candidate pilots, and then pre-candidate pilots. The scan of the pre-candidate pilots continues until all but a predetermined number of pre-candidate pilots have been promoted or demoted. Then the searcher receiver alternately scans the predetermined number of pre-candidate pilots and the neighbor pilots. The searcher receiver terminates alternate scans of the predetermined number of pre-candidate pilots and the neighbor pilots when a one of the neighbor pilots is promoted, and resumes the scan of the pre-candidate pilots.

摘要翻译： 一种装置（100）将导频组保持在利用码分多址的数字通信系统中。 该装置包括用于向搜索者接收机（109）提供指令的逻辑和控制电路（113）。 搜索者接收机响应于指令，顺序地扫描主动飞行员，然后扫描候选飞行员，然后预先候选飞行员。 候选候选飞行员的扫描继续进行，直到所有预定数量的候选候选飞行员已经被提升或降级为止。 然后，搜索者接收机交替地扫描预定数量的候选候选导频和相邻导频。 当一个相邻导频被促进时，搜索者接收机终止预定数量的候选前导频和相邻导频的交替扫描，并恢复预候选导频的扫描。

公开(公告)号：US5930288A

公开(公告)日：1999-07-27

申请号：US770468

申请日：1996-12-20

申请人： Michael A. Eberhardt

发明人： Michael A. Eberhardt

IPC分类号： H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04B17/00 ,  H04B1/69

CPC分类号： H04W52/42 ,  H04B1/707 ,  H04B17/318 ,  H04B1/7115 ,  H04B1/7117 ,  H04W52/225 ,  H04W52/228 ,  H04W52/40 ,  H04W52/56

摘要： A communication device (100) includes a plurality of receiver fingers (112, 114, 116) for receiving a spread spectrum communication signal. Each receiver finger includes a received signal strength indication (RSSI) circuit (400). The RSSI circuit (400) includes an energy calculator (406) and a filter (410, 412) for producing a filtered signal which indicates signal quality. A first comparator (414) produces a primary lock indication when the filtered signal exceeds a primary lock threshold. A second comparator (418) produces a secondary lock indication when the filtered signal exceeds a secondary lock threshold. The bandwidth of the RSSI circuit (400) can be varied between a first bandwidth for providing the primary lock indication for traffic channel decoder and a second bandwidth for providing the secondary lock indication for the power control bit decoder. This allows performance to be tailored to the individual requirements of the traffic channel decoding and the power control channel decoding.

摘要翻译： 通信设备（100）包括用于接收扩频通信信号的多个接收器指（112,114,116）。 每个接收器手指包括接收信号强度指示（RSSI）电路（400）。 RSSI电路（400）包括能量计算器（406）和用于产生指示信号质量的滤波信号的滤波器（410,412）。 当滤波的信号超过主锁定阈值时，第一比较器（414）产生主锁指示。 当滤波的信号超过辅助锁定阈值时，第二比较器（418）产生辅助锁定指示。 RSSI电路（400）的带宽可以在用于提供业务信道解码器的主锁定指示的第一带宽和用于为功率控制位解码器提供辅助锁定指示的第二带宽之间变化。 这允许根据业务信道解码和功率控制信道解码的个体要求来定制性能。

公开(公告)号：US5754583A

公开(公告)日：1998-05-19

申请号：US646710

申请日：1996-05-06

申请人： Michael A. Eberhardt ,  Colin D. Frank ,  Phillip D. Rasky

发明人： Michael A. Eberhardt ,  Colin D. Frank ,  Phillip D. Rasky

IPC分类号： H04B1/707 ,  H04B1/7115 ,  H04B1/7117 ,  H04B7/005 ,  H04B17/00 ,  H04B1/69

CPC分类号： H04W52/42 ,  H04B1/707 ,  H04B1/7115 ,  H04B1/7117 ,  H04B17/318 ,  H04W52/225 ,  H04W52/228 ,  H04W52/40 ,  H04W52/56

摘要： A communication device (100) includes a plurality of receiver fingers (112, 114, 116) for receiving a spread spectrum communication signal. Each receiver finger includes a received signal strength indication (RSSI) circuit (130). The RSSI circuit (130) includes a filter (135) for filtering a pilot sample signal and producing a filtered signal. A comparator (144) producing a lock indication when the filtered signal exceeds lock threshold. A combiner (118) combines the traffic signal from each receiver finger in response to the lock indication from each finger. The unlock threshold for the finger is reduced to a level above the noise floor of the receiver finger, to reduce the likelihood of a finger unlocking during a fade. Also traffic symbols are immediately combined after a finger assignment using a weighted channel estimate to permit assigning a finger as locked.

摘要翻译： 通信设备（100）包括用于接收扩频通信信号的多个接收器指（112,114,116）。 每个接收器手指包括接收信号强度指示（RSSI）电路（130）。 RSSI电路（130）包括用于对导频采样信号进行滤波并产生滤波信号的滤波器（135）。 比较器（144）当滤波信号超过锁定阈值时产生锁定指示。 组合器（118）响应于来自每个手指的锁定指示组合来自每个接收器手指的交通信号。 手指的解锁阈值降低到高于接收器手指的本底的水平，以减少在褪色期间手指解锁的可能性。 此外，在使用加权信道估计的手指分配之后立即组合业务符号，以允许将手指分配为锁定。

公开(公告)号：US6078611A

公开(公告)日：2000-06-20

申请号：US931149

申请日：1997-09-16

申请人： Christopher P. La Rosa ,  Michael J. Carney ,  Christopher J. Becker ,  Michael A. Eberhardt ,  Colin D. Frank ,  Phillip D. Rasky

发明人： Christopher P. La Rosa ,  Michael J. Carney ,  Christopher J. Becker ,  Michael A. Eberhardt ,  Colin D. Frank ,  Phillip D. Rasky

IPC分类号： H04B1/7113 ,  H04B1/7115 ,  H04B1/7117 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04B1/7117 ,  H04B1/7115 ,  H04B1/7113

摘要： A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.

摘要翻译： RAKE接收器（112）包括多个指状物（122,124,126,128）。 每个手指包括用于解调多径信号的射线的解调器（402）和用于根据射线的时间位置控制手指的时间位置的时间跟踪电路（404）。 检测到低延迟扩展状态，并且控制两个相邻手指的位置以防止两个或更多个手指围绕公共时间位置的会聚。 通过保持手指定时分离，即使在低延迟扩展条件期间，RAKE接收机也利用路径分集来提高接收机性能。