专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5151920A Radio LAN station with improved frame delimiter detection in a spread spectrum environment 失效
标题翻译：无线局域网站，在扩展频谱环境中具有改进的帧定界符检测
公开(公告)号：US5151920A
公开(公告)日：1992-09-29
申请号：US757392
申请日：1991-09-10
申请人： Johannes P. N. Haagh , Hans van Driest , Gerrit Smit
发明人： Johannes P. N. Haagh , Hans van Driest , Gerrit Smit
IPC分类号： H04B1/707 , H04B1/709 , H04J13/16 , H04L7/04 , H04L12/28
CPC分类号： H04B1/709 , H04B1/707 , H04J13/16 , H04L7/042 , H04W4/18 , H04W84/12 , H04W88/02
摘要： A radio LAN station is provided for receiving information frames including start and end delimiters and user data therebetween. The start and end delimiters include both data symbols and special non-data symbols. The data symbols and non-data symbols being transmitted to the radio LAN station are sent thereto via a spread spectrum signal. The data symbols and the non-data symbols are spread via first and second spreading codes, respectively. The receiving radio LAN station includes first and second correlators which respectively correlate the received spread spectrum signal against the first spreading code to retrieve the data symbols and against the second spreading code to retrieve the non-data symbols. Rectangular representations of the received data and non-data symbols are thus produced and are converted to polar form via appropriate rectangular to polar converters. The polar representations of the data and non-data symbols respectively exhibit a vector length Z and a vector length Z'. The receiving LAN station includes circuitry for determining that a symbol is a data symbol if Z - Z' is greater than or equal to a constant A, or that a symbol is a non-data symbol if Z - Z1 is less than said constant A. In this manner, the data and non-data symbols representing the start and end delimiters are detected.
摘要翻译：提供无线电站用于接收包括起始和终止分隔符以及它们之间的用户数据的信息帧。起始和终止分隔符包括数据符号和特殊非数据符号。发送到无线电局域网站的数据符号和非数据符号通过扩频信号发送给它。数据符号和非数据符号分别通过第一和第二扩展码进行扩展。接收无线电LAN站包括第一和第二相关器，它们分别使接收到的扩频信号与第一扩展码相关，以检索数据符号，并针对第二扩展码检索非数据符号。因此产生接收数据和非数据符号的矩形表示，并通过适当的矩形到极化转换器转换成极性形式。数据和非数据符号的极性表示分别表示向量长度Z和向量长度Z'。如果Z-Z'大于或等于常数A，则接收LAN站包括用于确定符号是数据符号的电路，或者如果Z-Z1小于所述常数A，则符号是非数据符号以这种方式，检测表示开始和结束分隔符的数据和非数据符号。

2. 再颁专利

USRE40032E1 Wireless data communication system having power saving function 有权
标题翻译：具有省电功能的无线数据通信系统
公开(公告)号：USRE40032E1
公开(公告)日：2008-01-22
申请号：US10368018
申请日：2003-02-19
申请人： Hendrik van Bokhorst , Albertus M. G. Claessen , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Leo Monteban , Rienk Mud
发明人： Hendrik van Bokhorst , Albertus M. G. Claessen , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Leo Monteban , Rienk Mud
IPC分类号： H04B7/14
CPC分类号： H04W52/0216 , Y02D70/142 , Y02D70/22
摘要： A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (20) communicate via a base station access point (16), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (20) that are to receive data messages. In another embodiment all stations (220) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (220) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (220), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.
摘要翻译：无线数据通信系统在省电模式下可操作，其中站同步处于唤醒状态以接收同步消息（TIM，PSYNC）和业务指示符信息，并且如果它们不接收数据消息，则其被改变为打盹状态。在一个实施例中，所有站（20）经由基站接入点（16）进行通信，基站接入点（16）以规则的间隔广播同步消息（TIM），以识别要接收数据消息的站（20）。在另一个实施例中，所有站（220）彼此直接通信，一个站承担主站的作用并广播同步消息（PSYNC），并且期望发送数据消息的站（220）将业务指示符消息（PTIM）发送到预期在下一个同步消息（PSYNC）之前的同步唤醒时段期间，适当的目的地站（220）将到达。

3. 发明授权

US5553316A Power control method in a wireless communication system 失效
标题翻译：无线通信系统中的功率控制方法
公开(公告)号：US5553316A
公开(公告)日：1996-09-03
申请号：US587172
申请日：1996-01-16
申请人： Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh
发明人： Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh
IPC分类号： H04B7/005 , H04L12/28 , H04W52/24 , H04B7/26
CPC分类号： H04W52/24
摘要： A wireless local area network (10) including a plurality of stations (12) utilizes dynamic transmit power level control such that only the power level needed for reliable transmission to a particular station (12) is utilized. Each transmitted information packet (80) contains a byte (92) representing the power level at which the packet (80) was transmitted. The power level at which the packet (80) is received is measured and a path attenuation value is calculated, averaged over a plurality of packets and utilized, together with a measured interference level also transmitted in the packet (80), to determined a transmit power level for that path. Also determined is an associated defer threshold level. The transmit power levels and associated defer threshold levels are stored in a table (270).
摘要翻译：包括多个站（12）的无线局域网（10）利用动态发射功率电平控制，使得仅利用对于特定站（12）的可靠传输所需的功率电平。每个发送的信息分组（80）包含表示发送分组（80）的功率电平的字节（92）。测量接收到分组（80）的功率电平，并且计算路径衰减值，并在多个分组中进行平均，并与在分组（80）中发送的测量的干扰电平一起使用，以确定传输该路径的功率级别。还确定了相关的延迟阈值水平。发射功率电平和相关联的延迟阈值电平存储在表（270）中。

4. 发明授权

US06278877B1 Handover method for mobile wireless station 失效
标题翻译：移动无线站切换方法
公开(公告)号：US06278877B1
公开(公告)日：2001-08-21
申请号：US08065328
申请日：1993-05-21
申请人： Loeke Brederveld , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Jan Hoogendoorn
发明人： Loeke Brederveld , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Jan Hoogendoorn
IPC分类号： H04B700
CPC分类号： H04W36/30
摘要： A wireless local area network system includes a plurality of base stations connected in a wired local area network. A mobile wireless station can roam through communication cells defined by the base stations. The base stations transmit beacon messages at regular intervals. The mobile station determines the communications quality of the beacon message for the cell in which the mobile station is currently located and if this quality becomes unacceptable, switches to a search mode wherein beacon messages from any base station are received and their communications quality is determined. The mobile station switches to communicate with a base station providing a beacon message with an acceptable communications quality.
摘要翻译：无线局域网系统包括连接在有线局域网中的多个基站。移动无线站可以漫游由基站定义的通信小区。基站以规则的间隔发送信标消息。移动台确定移动台当前所在小区的信标消息的通信质量，如果该质量变得不可接受，则切换到其中接收来自任何基站的信标消息并确定其通信质量的搜索模式。移动台切换到与提供具有可接受通信质量的信标消息的基站通信。

5. 发明授权

US06192230B1 Wireless data communication system having power saving function 失效
标题翻译：具有省电功能的无线数据通信系统
公开(公告)号：US06192230B1
公开(公告)日：2001-02-20
申请号：US08127268
申请日：1993-09-27
申请人： Hendrik van Bokhorst , Albertus M. G. Claessen , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Leo Monteban , Rienk Mud
发明人： Hendrik van Bokhorst , Albertus M. G. Claessen , Wilhelmus J. M. Diepstraten , Johannes P. N. Haagh , Hendrik Moelard , Leo Monteban , Rienk Mud
IPC分类号： H04B714
CPC分类号： H04W52/0216 , H04W88/022 , Y02D70/142 , Y02D70/22
摘要： A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (20) communicate via a base station access point (16), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (20) that are to receive data messages. In another embodiment all stations (220) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (220) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (220), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.
摘要翻译：无线数据通信系统在省电模式下可操作，其中站同步处于唤醒状态以接收同步消息（TIM，PSYNC）和业务指示符信息，并且如果它们不接收数据消息，则其被改变为打盹状态。在一个实施例中，所有站（20）经由基站接入点（16）进行通信，基站接入点（16）以规则的间隔广播同步消息（TIM），以识别要接收数据消息的站（20）。在另一个实施例中，所有站（220）彼此直接通信，一个站承担主站的作用并广播同步消息（PSYNC），并且期望发送数据消息的站（220）将业务指示符消息（PTIM）发送到预期在下一个同步消息（PSYNC）之前的同步唤醒时段期间，适当的目的地站（220）将到达。

6. 发明授权

US5519834A Method of transmitting selected message frames without individual destination address in non-overlapping sequential time intervals from host computer to terminals via bridges and retransmitting thereafter 失效
标题翻译：以非重叠的连续时间间隔从主计算机通过网桥传输所选择的消息帧而不是单独的目的地地址的方法，然后重传
公开(公告)号：US5519834A
公开(公告)日：1996-05-21
申请号：US927986
申请日：1992-08-11
申请人： Adriaan Kamerman , Johannes P. N. Haagh
发明人： Adriaan Kamerman , Johannes P. N. Haagh
IPC分类号： H04L12/28 , G06F13/12 , G06F13/14
CPC分类号： H04L12/462 , H04W4/12 , H04W84/12 , H04W88/14
摘要： A local area network system (10) includes a host computer (14) connected in a wired LAN (12) with a plurality of bridges (18). The bridges (18) further connect with respective wireless LANs (100, 200, . . . , 600) which operate on a common wireless communication channel and contain respective pluralities of terminals (102, 202, . . . , 602). When a download operation is effected for initially starting up a new added terminal (e.g. 102-1), the bridges (18) are adapted to identify download message frames issued by the host computer (14) and retransmit each such frame (400) over the wireless communication channel in non-overlapping time intervals by applying respective different delays. Also, each download message frame is transmitted twice by each of the bridges (18).
摘要翻译：局域网系统（10）包括连接在具有多个桥（18）的有线LAN（12）中的主计算机（14）。桥接器（18）进一步与在公共无线通信信道上操作并包含相应多个终端（102,202，...，602）的相应无线LAN（100,200，...，600）连接。当进行用于初始启动新添加的终端（例如，102-1）的下载操作时，网桥（18）适于识别由主计算机（14）发出的下载消息帧，并将每个这样的帧（400）重传通过应用各自的不同延迟，以非重叠时间间隔的无线通信信道。此外，每个下载消息帧由桥接器（18）发送两次。

7. 发明授权

US4860308A Modem communication system having main and secondary channels 失效
标题翻译：调制解调器通信系统具有主要和次要信道
公开(公告)号：US4860308A
公开(公告)日：1989-08-22
申请号：US175375
申请日：1988-03-30
申请人： Adriaan Kamerman , Johannes P. N. Haagh
发明人： Adriaan Kamerman , Johannes P. N. Haagh
IPC分类号： H04L1/24 , H04M11/06
CPC分类号： H04L1/24 , H04M11/06
摘要： A data modem communication system includes a data modem transmitter adapted to transmit data on a main channel at a relatively high bit rate and to transmit data at a relatively low bit rate on a secondary channel. At the receiver, a single analog-to-digital converter (54) supplies digital signals via a notch filter (58) to the main channel receiver (60) and to the secondary channel receiver (62) wherein a single IIR low-pass digital filter (110) is utilized for processing at three different sample rates to eliminate the main channel signal with frequency conversion taking place between processing at the first and second sample rates. The invention enables the provision of a reliable secondary channel while using a minimum amount of circuitry for complex-valued digital signal processing.
摘要翻译：数据调制解调器通信系统包括数据调制解调器发送器，其适于以相对高的比特率在主信道上发送数据，并且在次信道上以相对低的比特率发送数据。在接收机处，单个模数转换器（54）通过陷波滤波器（58）将数字信号提供给主信道接收机（60）和辅助信道接收机（62），其中单个IIR低通数字滤波器（110）用于以三种不同的采样率进行处理，以消除在第一和第二采样率的处理之间发生频率转换的主信道信号。本发明使得能够提供可靠的辅助信道，同时使用用于复值数字信号处理的最小量的电路。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式