-
公开(公告)号：US20040179585A1
公开(公告)日：2004-09-16
申请号：US10809361
申请日：2004-03-26
IPC分类号： H04B001/707
CPC分类号： H04B1/70751 , H04B1/70752 , H04B1/70775 , H04B1/7093 , H04B1/7095
摘要： Multi-path effects are common in mobile communications. When coupled with spread-spectrum signals utilizing spreading code sequences, detection of more than one multi-path signal becomes a necessity in order to output a clean signal with little loss. In accord with the invention, a spread-spectrum sliding matched-filter searcher system comprises a partial matched-filter that receives the input spread-spectrum signal. The searcher matches samples of the input signal with a tap length m of the reference code and produces a first correlation value. The first correlation value is compared to a first threshold. When it equals or exceeds the first threshold, the first correlation value is integrated to produce a second correlation value. This second value is compared with a second threshold, which if met signifies the detection of the multi-path signal. The process is repeated until all significant multi-path signals are detected. This design of the present invention is flexible in nature because the searcher can be programmed to act like a matched-filter, a correlator, or a combination of both while significantly improving the search time and reducing the amount of hardware and complexity characteristic of a matched-filter.
-
公开(公告)号：US20040042429A1
公开(公告)日：2004-03-04
申请号：US10649816
申请日：2003-08-28
发明人： Emmanuel Kanterakis , Kourosh Parsa
IPC分类号： H04B007/216
CPC分类号： H04W52/48 , H04B1/707 , H04B7/2668 , H04J13/0051 , H04L1/0071 , H04L1/16 , H04L2001/0097 , H04W52/36 , H04W52/50 , H04W52/54
摘要： An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal, which includes a plurality of RS-preamble signals, RS-power-control signals, and RS-pilot signals, respectively, transmitted in time, at increasing power levels. The BS-spread-spectrum transmitter, responsive to the BS-spread-spectrum receiver receiving the access-burst signal, and detecting an RS-preamble signal, transmits an acknowledgment signal. In response to the first RS-spread-spectrum receiver receiving the Acknowledgment signal, the first RS-spread-spectrum transmitter transmits a spread-spectrum signal having data.
摘要翻译： 对CDMA系统具有基站（BS）和多个远程站的采用扩频调制的码分多址（CDMA）系统的改进。 基站具有BS扩频发射机和BS扩频接收机。 远程站具有RS扩频发射机和RS扩频接收机。 BS发射机发送包括帧定时信号的广播公共同步信道。 广播共同同步信道具有公共芯片序列信号，这是多个远程站所共有的信号。 响应于接收广播公共同步信道的RS扩频接收机，并根据帧定时信号确定帧定时，RS扩频发射机发送接入脉冲串信号，其包括多个RS- 前导信号，RS功率控制信号和RS导频信号，分别以增加的功率电平在时间上传输。 BS扩频发射机响应接收到接入突发信号的BS扩频接收机，并检测RS前同步信号，发送确认信号。 响应于接收到确认信号的第一RS扩频接收机，第一RS扩频发射机发送具有数据的扩频信号。
-
公开(公告)号：US20020136272A1
公开(公告)日：2002-09-26
申请号：US10096312
申请日：2002-03-13
发明人： Emmanuel Kanterakis , Kourosh Parsa
IPC分类号： H04B001/707
CPC分类号： H04W52/48 , H04B1/707 , H04B7/2668 , H04J13/0051 , H04L1/0071 , H04L1/16 , H04L2001/0097 , H04W52/36 , H04W52/50 , H04W52/54
摘要： An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal, which includes a plurality of RS-preamble signals, RS-power-control signals, and RS-pilot signals, respectively, transmitted in time, at increasing power levels. The BS-spread-spectrum transmitter, responsive to the BS-spread-spectrum receiver receiving the access-burst signal, and detecting an RS-preamble signal, transmits an acknowledgment signal. In response to the first RS-spread-spectrum receiver receiving the acknowledgment signal, the first RS-spread-spectrum transmitter transmits a spread-spectrum signal having data.
摘要翻译： 对CDMA系统具有基站（BS）和多个远程站的采用扩频调制的码分多址（CDMA）系统的改进。 基站具有BS扩频发射机和BS扩频接收机。 远程站具有RS扩频发射机和RS扩频接收机。 BS发射机发送包括帧定时信号的广播公共同步信道。 广播共同同步信道具有公共芯片序列信号，这是多个远程站所共有的信号。 响应于接收广播公共同步信道的RS扩频接收机，并根据帧定时信号确定帧定时，RS扩频发射机发送接入脉冲串信号，其包括多个RS- 前导信号，RS功率控制信号和RS导频信号，分别以增加的功率电平在时间上传输。 BS扩频发射机响应接收到接入突发信号的BS扩频接收机，并检测RS前同步信号，发送确认信号。 响应于接收到确认信号的第一RS扩频接收机，第一RS扩频发射机发送具有数据的扩频信号。
-
公开(公告)号：US20030223476A1
公开(公告)日：2003-12-04
申请号：US10412576
申请日：2003-04-14
发明人： Emmanuel Kanterakis , Kourosh Parsa
IPC分类号： H04B001/707
CPC分类号： H04B1/7075 , H04B1/707 , H04B7/2668 , H04B2201/70701 , H04B2201/70702 , H04J11/0069 , H04W4/06 , H04W24/00 , H04W52/325 , H04W52/362 , H04W52/367 , H04W52/48 , H04W56/00 , H04W74/00
摘要： An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The access-burst signal includes a collision-detection portion. In response to the BS-spread-spectrum receiver receiving the access-burst signal, the BS-spread-spectrum transmitter transmits an collision-detection signal with the collision detection portion. In response to the BS-spread-spectrum receiver not receiving the access-burst signal due to a collision with a collision access-burst signal, the BS-spread-spectrum transmitter transmits an collision-detection signal without the correct collision detection portion.
摘要翻译： 对CDMA系统具有基站（BS）和多个远程站的采用扩频调制的码分多址（CDMA）系统的改进。 基站具有BS扩频发射机和BS扩频接收机。 远程站具有RS扩频发射机和RS扩频接收机。 BS发射机发送包括帧定时信号的广播公共同步信道。 广播共同同步信道具有公共芯片序列信号，这是多个远程站所共有的信号。 响应于接收广播公共同步信道的RS扩频接收机，并根据帧定时信号确定帧定时，RS扩频发射机发送接入突发信号。 接入突发信号包括冲突检测部分。 响应于接收到接入突发信号的BS扩频接收机，BS扩频发射机与冲突检测部分发送冲突检测信号。 响应于由于与冲突接入突发信号的冲突而没有接收到接入突发信号的BS扩频接收机，BS扩频发射机发送没有正确的冲突检测部分的冲突检测信号。
-
公开(公告)号：US20020027947A1
公开(公告)日：2002-03-07
申请号：US09941756
申请日：2001-08-30
发明人： Emmanuel Kanterakis , Kourosh Parsa
IPC分类号： H04K001/00 , H04L027/06 , H04L027/30
CPC分类号： H04W52/48 , H04B1/707 , H04B7/2668 , H04J13/0051 , H04L1/0071 , H04L1/16 , H04L2001/0097 , H04W52/36 , H04W52/50 , H04W52/54
摘要： An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The BS-spread-spectrum transmitter, responsive to the BS-spread-spectrum receiver receiving the access-burst signal, transmits an acknowledgment signal. In response to the first RS-spread-spectrum receiver receiving the acknowledgment signal, the first RS-spread-spectrum transmitter transmits a spread-spectrum signal having data.
摘要翻译： 对CDMA系统具有基站（BS）和多个远程站的采用扩频调制的码分多址（CDMA）系统的改进。 基站具有BS扩频发射机和BS扩频接收机。 远程站具有RS扩频发射机和RS扩频接收机。 BS发射机发送包括帧定时信号的广播公共同步信道。 广播共同同步信道具有公共芯片序列信号，这是多个远程站所共有的信号。 响应于接收广播公共同步信道的RS扩频接收机，并根据帧定时信号确定帧定时，RS扩频发射机发送接入突发信号。 BS扩频发射机响应接收到接入突发信号的BS扩频接收机，发送确认信号。 响应于接收到确认信号的第一RS扩频接收机，第一RS扩频发射机发送具有数据的扩频信号。
-
公开(公告)号：US20040057397A1
公开(公告)日：2004-03-25
申请号：US10667665
申请日：2003-09-23
发明人： Emmanuel Kanterakis , Kourosh Parsa
IPC分类号： H04B007/216
CPC分类号： H04W52/48 , H04B1/707 , H04B7/2668 , H04J13/0051 , H04L1/0071 , H04L1/16 , H04L2001/0097 , H04W52/36 , H04W52/50 , H04W52/54
摘要： An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The BS-spread-spectrum transmitter, responsive to the BS-spread-spectrum receiver receiving the access-burst signal, transmits an acknowledgment signal. In response to the first RS-spread-spectrum receiver receiving the acknowledgment signal, the first RS-spread-spectrum transmitter transmits a spread-spectrum signal having data.
-
公开(公告)号：US20020015437A1
公开(公告)日：2002-02-07
申请号：US09970888
申请日：2001-10-05
IPC分类号： H04K001/00
CPC分类号： H04B7/2628 , H04B1/7105 , H04J13/004
摘要： A multi-channel spread-spectrum system separates a data stream, for example from a convolutional encoder and an interleaver, into sub-channel data-sequence signals. For each sub-channel data-sequence signal, m bits are translated to one code of a unique set of orthogonal chip-sequence signals. The other k bits of the same sub-channel data-sequence signal are translated to a distinct phasor. Each phasor is used to modulate the respective chip-sequence signal. A complex-signal combiner combines the real and imaginary components of all the phase-modulated chip-sequence signals into in-phase (I) and quadrature (Q) spread-spectrum multi-channel signals, which are spread by a cell-site specific signature-sequence. The receiver decorrelates the received spread-spectrum signal, preferably with a bank of matched filter (MF) joint-detectors, to recover the bits from all the spread-spectrum sub-channel signals for remultiplexing into the transmitted data stream. The multi-channel spread-spectrum system supports constant data rate throughout the cell by maintaining a large processing gain, at the multiplexed sub-channel data sequency level, thus a code-reuse-one type spread-spectrum system can be deployed with the aid of power control.
摘要翻译： 多通道扩频系统将例如从卷积编码器和交织器的数据流分离成子信道数据序列信号。 对于每个子信道数据序列信号，将m位转换为唯一的一组正交码片序列信号的一个码。 相同子信道数据序列信号的其他k位被转换为独立的相量。 每个相量用于调制相应的码片序列信号。 复信号组合器将所有相位调制芯片序列信号的实部和虚部组合到同相（I）和正交（Q）扩频多通道信号中，这些信号由小区站点特定 签名序列。 接收机将所接收的扩频信号优选地与一组匹配滤波器（MF）联合检测器去相关，以从所有扩频子信道信号中恢复比特，以便再次复用到所发送的数据流中。 多通道扩频系统通过在复用的子信道数据顺序级别保持大的处理增益来支持整个小区的恒定数据速率，从而可以借助于部署代码重用一类型扩频系统 的电源控制。
-
公开(公告)号：US20010033600A1
公开(公告)日：2001-10-25
申请号：US09729694
申请日：2000-12-06
发明人： Gang Yang , Don Li , Elmer Yuen
IPC分类号： H04K001/00 , H04B015/00 , H04L027/30 , H01Q003/00
摘要： A sectorized smart antenna system includes multiple sector antennas with a software control algorithm for flexible association of physical antennas to a logical serving sector to provide signal coverage in a particular region of the cell served by the base station. The control algorithm can adapt to different situations without requiring any, or only very limited, physical hardware changes to reconfigure a base station to balance the traffic load throughout the cell. The smart antenna system and method includes measuring and recording a mobile station's signal strengths and its rate of changes received by an antenna in a serving sector relative to other antennas in either the same serving sector or different serving sector to determine the mobile station location and its movement, determining when a threshold signal level is reached, and handing-off the mobile station to an adjacent antenna, serving sector, or cell.
摘要翻译： 分段智能天线系统包括具有软件控制算法的多个扇区天线，用于将物理天线灵活地关联到逻辑服务扇区，以在由基站服务的小区的特定区域中提供信号覆盖。 控制算法可以适应不同的情况，而不需要任何或仅有非常有限的物理硬件改变来重新配置基站以平衡整个小区的业务负载。 智能天线系统和方法包括测量和记录移动台的信号强度及其在服务扇区中相对于同一服务扇区或不同服务扇区中的其他天线所接收的改变速率，以确定移动站位置及其 移动，确定何时达到阈值信号电平，以及将移动台切换到相邻天线，服务扇区或小区。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.014 秒)
