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公开(公告)号：US07123941B2
公开(公告)日：2006-10-17
申请号：US10083508
申请日：2002-02-27
申请人： Tadayuki Fukuhara , Hiroyasu Ishikawa , Takayuki Warabino , Naoki Fuke , Keizo Sugiyama , Hideyuki Shinonaga
发明人： Tadayuki Fukuhara , Hiroyasu Ishikawa , Takayuki Warabino , Naoki Fuke , Keizo Sugiyama , Hideyuki Shinonaga
摘要： A radio LAN master station system which provides long distance communication and suffers from small interference by another system located inside and/or outside of a service area comprises a transceiver, and a plurality of directional antennas each directed to a respective section with some angular spacing, through a power distributor which couples said transceiver with said antennas. Polarization plane of any antenna is orthogonal to polarization plane of an adjacent antenna.
摘要翻译： 提供长距离通信并受到位于服务区域内部和/或外部的另一系统的小干扰的无线电LAN主站系统包括收发器和多个定向天线，每个定向天线各自指向具有一定角度间隔的相应部分， 通过将所述收发器与所述天线耦合的电力分配器。 任何天线的极化平面与相邻天线的极化平面正交。
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2.发明授权公开(公告)号：US06785248B2
公开(公告)日：2004-08-31
申请号：US09736318
申请日：2000-12-15
IPC分类号： H04Q700
摘要： In each of communication stations, among all of spread spectrum signal waves having the carrier frequencies separated from each other in units of an integer multiple of the frequency amount R, all the spread spectrum signal waves having the carrier frequencies separated from each other in units of an even-number multiple of the frequency amount R are converged into a first group; all the spread spectrum signal waves that are adjacent to the aforementioned spread spectrum signal waves and that have the carrier frequencies separated in units of an even-number multiple of the frequency amount R are converged into a second group; and the first and the second groups of spread spectrum signal waves are simultaneously transmitted according to orthogonal polarized waves to perform information transmission.
摘要翻译： 在每个通信站中，在以频率量R的整数倍为单位的载波频率彼此分离的全部扩频信号波中，具有彼此分离的载波频率的所有扩频信号波单位为 频率量R的偶数倍收敛到第一组中; 与上述扩频信号波相邻并且具有以频率量R的偶数倍为单位的载波频率分离的所有扩频信号波被收敛成第二组; 并且根据正交偏振波同时发送第一组和第二组扩频信号波，以执行信息传输。
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公开(公告)号：US6154506A
公开(公告)日：2000-11-28
申请号：US070931
申请日：1998-05-01
CPC分类号： H04L7/0334 , H04L7/0331
摘要： A timing recovery and tracking method and apparatus with respect to data signal in a digital communication system is provided. The method includes a step of setting a time window for making a decision based upon a predetermined threshold level, the time window having a time period corresponding to a transmission data rate in the digital communication system, a step of detecting a time duration positioned within the time window, a level of a received signal being higher than the predetermined threshold level during the time duration, a step of assuming a substantially middle point of the time duration as an optimum decision point of the received signal, and a step of updating the time window so that the updated time window has its center at a position of the assumed optimum decision point.
摘要翻译： 提供了一种关于数字通信系统中的数据信号的定时恢复和跟踪方法和装置。 该方法包括以下步骤：基于预定阈值水平设置用于进行判定的时间窗口，该时间窗口具有与数字通信系统中的传输数据速率对应的时间段，检测位于该数据通信系统内的时间段的步骤 在所述持续时间期间接收信号的电平高于所述预定阈值电平的步骤，将所述持续时间的大致中点作为所述接收信号的最佳判定点的步骤，以及更新所述时间窗口的步骤 窗口，使得更新的时间窗口的中心位于假定的最佳决策点的位置。
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公开(公告)号：US6104746A
公开(公告)日：2000-08-15
申请号：US925319
申请日：1997-09-08
CPC分类号： H04L27/2602 , H04B1/707 , H04B2201/70703
摘要： A combined channel or a composite channel is to be transformed into a plurality of element channels. The composite channel may be either shared by a plurality of communication stations on time division multiplex basis, or used by a single communication station. In a transmit side, a serial data information which is called a composite channel is transformed to parallel form associated with a plurality of element channels, each of which is spread by using a single common PN code. Each spread element channels are frequency converted to radio frequency so that the center carrier frequency is offset from that of adjacent element channel by an integer multiple of information transmission rate of each element channel, and frequency band occupied by spread element channels overlap with one another. Each element channels thus spread and frequency converted are combined on frequency axis, and transmitted to a receive side. Thus, all the element channels are synchronized with one another because of the use of a single common PN code, and receive level of signal of each element channel is uniform, irrespective of a number of communication stations, and therefore, high quality communication with no interference is obtained in a relatively narrow frequency band.
摘要翻译： 组合信道或复合信道将被转换成多个元素信道。 复合信道可以由多个通信站以时分复用为基础共享，或由单个通信站使用。 在发送侧，称为复合信道的串行数据信息被变换成与多个元素信道相关联的并行形式，每个元素信道通过使用单个公共PN码进行扩展。 每个扩展元素信道被频率转换为射频，使得中心载波频率与相邻元素信道的中心载波频率偏移每个元素信道的信息传输速率的整数倍，并且扩频元件信道占据的频带彼此重叠。 如此扩频和频率转换的每个元素信道在频率轴上组合，并传输到接收侧。 因此，由于使用单个公共PN码，所有元件信道彼此同步，并且每个元件信道的接收信号水平是均匀的，而与通信站数量无关，因此，高质量的通信没有 在相对窄的频带获得干扰。
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公开(公告)号：US5974082A
公开(公告)日：1999-10-26
申请号：US958094
申请日：1997-10-27
CPC分类号： H04J13/00 , H04B7/2618 , H04L5/06
摘要： A spread spectrum communications system includes at least one communication station for transmitting a plurality of digital information data sequences via a plurality of communication channels by using the same PN code sequence. The communication station spreads the respective digital information data sequences by the PN code sequence to provide spread spectrum signals, modulates the spread spectrum signals by respective carriers having different frequencies from each other to provide modulated signals, and then transmits the modulated signals via the communication channels respectively. A frequency interval of the carrier frequencies is determined to an even-numbered multiple of a symbol rate of the transmitted digital information data sequences.
摘要翻译： 扩展频谱通信系统包括至少一个通信站，用于通过使用相同的PN码序列经由多个通信信道发送多个数字信息数据序列。 通信站通过PN码序列扩展各个数字信息数据序列，以提供扩频信号，通过具有不同频率的各个载波调制扩频信号以提供调制信号，然后经由通信信道发送调制信号 分别。 载波频率的频率间隔被确定为发送的数字信息数据序列的符号率的偶数倍。
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公开(公告)号：US07336742B2
公开(公告)日：2008-02-26
申请号：US10424070
申请日：2003-04-28
IPC分类号： H04L27/06
CPC分类号： H04L27/2657 , H04L27/2613 , H04L27/2675 , H04L27/2684
摘要： A frequency error correction device for an OFDM receiver is proposed. The receiver receives an OFDM signal with a preamble section and a payload section including pilot carriers. The frequency error correction device includes a first frequency correction unit for correcting a relative phase error in a predetermined period of time based upon a frequency error in the preamble section of the OFDM signal in time domain, and a second frequency correction unit for correcting a remaining phase error in every predetermined period of time based upon the pilot carriers of the OFDM signal in frequency domain.
摘要翻译： 提出了一种用于OFDM接收机的频率纠错装置。 接收机接收具有前导码部分和包括导频载波的有效载荷部分的OFDM信号。 频率误差校正装置包括：第一频率校正单元，用于基于时域中的OFDM信号的前导码部分中的频率误差校正预定时间段中的相对相位误差;以及第二频率校正单元，用于校正剩余的 基于频域中的OFDM信号的导频载波，每个预定时间段的相位误差。
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7.发明授权
公开(公告)号：US5969669A
公开(公告)日：1999-10-19
申请号：US566737
申请日：1995-12-04
CPC分类号： G01S5/12 , H04B7/18547
摘要： A method is disclosed for uniquely determining the position of a mobile earth station in a mobile satellite communication system which employs a non-geostationary satellite with a multi-spot beams. A given point of a preknown position on the earth surface is defined as the center coordinate of a three-dimensional coordinate axis, information on the measured distance and Doppler shift amount between a mobile earth station of an unknown position and a non-geostationary satellite is used to repeat the estimation of the position of the mobile earth station a plurality of times, thereby obtaining the position of the earth station with high accuracy. Furthermore, by observing the estimated positions of the mobile earth station obtained as a plurality of solutions at proper time intervals, comparing with one another the movements of the respective estimated positions occurring with the local time proceeds and selecting the estimated position of the minimum movement, the estimated position of the mobile earth station is uniquely determined relative to its true position.
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8.发明授权公开(公告)号：US07391715B2
公开(公告)日：2008-06-24
申请号：US10686560
申请日：2003-10-17
IPC分类号： H04J11/00
CPC分类号： H04L1/0001 , H04L1/0003 , H04L1/0017 , H04L5/023 , H04L27/2601
摘要： A transmitter device comprises an OFDM transmission unit, a MC-CDMA transmission unit, and a control unit for selecting either the OFDM transmission unit or the MC-CDMA transmission unit at slot time assigned to a receiver device in response to propagation conditions for the receiver device. The propagation conditions are a distance from the receiver device and a CINR.
摘要翻译： 发射机装置包括OFDM传输单元，MC-CDMA传输单元和控制单元，用于响应于接收机的传播条件，在分配给接收机设备的时隙时间选择OFDM传输单元或MC-CDMA传输单元 设备。 传播条件是与接收机设备和CINR的距离。
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9.发明授权Surface acoustic wave-matched filter and differential detector for demodulating spread spectrum signals 失效用于解调扩频信号的表面声波匹配滤波器和差分检波器公开(公告)号：US06629121B1
公开(公告)日：2003-09-30
申请号：US09413946
申请日：1999-10-07
IPC分类号： G06G712
CPC分类号： G06G7/195
摘要： A surface acoustic wave-matched filter is disclosed which comprises: an input transducer provided on a piezoelectric substrate surface; a first output transducer, that is, a forward output transducer encoded in correspondence to a pseudo-noise code sequence for spectrum spreading and provided on the substrate surface; and a second output transducer, that is, a backward output transducer encoded in correspondence to the pseudo-noise sequence code and provided on the substrate surface at the succeeding to the forward output transducer by the length of the pseudo-noise code sequence as viewed from the input transducer. With the use of the surface acoustic wave-matched filter, it is possible to realize a differential detector for demodulating spread spectrum signals.
摘要翻译： 公开了一种表面声波匹配滤波器，其包括：设置在压电基片表面上的输入换能器; 第一输出换能器，即对应于用于频谱扩展的伪噪声码序列而被编码并提供在基板表面上的正向输出换能器; 以及第二输出换能器，即对应于伪噪声序列码编码的后向输出换能器，并且在正向输出换能器之后的基板表面上提供伪随机码序列的长度，如从 输入传感器。 通过使用表面声波匹配滤波器，可以实现用于解调扩频信号的差分检波器。
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10.发明授权Method for determining position of mobile earth station in satellite communication system 失效确定卫星通信系统中移动地球站位置的方法
公开(公告)号：US6166687A
公开(公告)日：2000-12-26
申请号：US353543
申请日：1999-07-14
CPC分类号： G01S5/12 , H04B7/18547
摘要： A method is disclosed for uniquely determining the position of a mobile earth station in a mobile satellite communication system which employs a non-geostationary satellite with a multi-spot beams. A given point of a preknown position on the earth surface is defined as the center coordinate of a three-dimensional coordinate axis, information on the measured distance and Doppler shift amount between a mobile earth station of an unknown position and a non-geostationary satellite is used to repeat the estimation of the position of the mobile earth station a plurality of times, thereby obtaining the position of the earth station with high accuracy. Furthermore, by observing the estimated positions of the mobile earth station obtained as a plurality of solutions at proper time intervals, comparing with one another the movements of the respective estimated positions occurring with the local time proceeds and selecting the estimated position of the minimum movement, the estimated position of the mobile earth station is uniquely determined relative to its true position.
摘要翻译： 公开了一种用于在采用具有多点波束的非对地静止卫星的移动卫星通信系统中唯一地确定移动地球站的位置的方法。 将地球表面上预先知道的位置的给定点定义为三维坐标轴的中心坐标，关于未知位置的移动地球站与非对地静止卫星之间的测量距离和多普勒频移量的信息是 用于多次重复对移动地球站的位置的估计，从而以高精度获得地球站的位置。 此外，通过以适当的时间间隔观察作为多个解决方案获得的移动地球站的估计位置，相对于当前时间发生的各个估计位置的移动进行并选择最小运动的估计位置， 移动地球站的估计位置相对于其真实位置是唯一确定的。
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