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1. 发明授权

US5220564A Transmission control for a wireless local area network station 失效
标题翻译：无线局域网网络的传输控制
公开(公告)号：US5220564A
公开(公告)日：1993-06-15
申请号：US633699
申请日：1990-12-24
申请人： Bruce T. Tuch , Hans van Driest
发明人： Bruce T. Tuch , Hans van Driest
IPC分类号： H04B7/005 , H04L12/28
CPC分类号： H04W52/10
摘要： In a local area network station (12) for a wireless LAN, a threshold level circuit (62) includes a register (134) which stores a threshold value. The station receiver (42) monitors the transmission channel and provides a receive level signal indicative of the signal level received. Transmission of a data frame by the station transmitter (46) is permitted or deferred according as the receive level signal value is below or above the threshold level, regardless of whether or not the received signal derives from a transmission by a station in the receiving station's own LAN. The threshold is dynamically updated whenever the station (12) receives a data frame from its own LAN. An improved utilization of the wireless transmission channel is achieved.

2. 发明授权

US4998261A Spread spectrum signal demodulator 失效
标题翻译：扩频信号解调器
公开(公告)号：US4998261A
公开(公告)日：1991-03-05
申请号：US450891
申请日：1989-12-14
申请人： Hans van Driest , Jacobus C. Haartsen , Bruce T. Tuch , Maarten Visee
发明人： Hans van Driest , Jacobus C. Haartsen , Bruce T. Tuch , Maarten Visee
IPC分类号： H04B1/707
CPC分类号： H04B1/7093 , H04B1/70712
摘要： In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW device (100) which has first and second output transducers (142, 144) spaced apart on the SAW substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.

3. 发明授权

US06314145B1 Tracking carrier timing 有权
标题翻译：跟踪载波定时
公开(公告)号：US06314145B1
公开(公告)日：2001-11-06
申请号：US09168145
申请日：1998-10-07
申请人： Hans van Driest
发明人： Hans van Driest
IPC分类号： H04L2714
CPC分类号： H04L27/2332 , H03J7/04 , H04L7/0029 , H04L2027/003 , H04L2027/0046
摘要： The timing of a carrier signal is tracked in a receiver. The receiver receives a signal produced by a transmitter having a single frequency source which is used to generate a reference clock frequency and a carrier signal frequency, there being a fixed, predetermined relationship between the reference and carrier frequencies. In the receiver there is a single frequency source which is used to generate a reference clock frequency and a carrier reference signal frequency, there being a fixed, predetermined relationship between the reference and carrier reference frequencies. The fixed, predetermined relationship in the transmitter and the receiver is the same.
摘要翻译：载波信号的定时在接收机中被跟踪。接收机接收由具有单个频率源的发射机产生的信号，该单个频率源用于产生参考时钟频率和载波信号频率，在参考频率和载波频率之间存在固定的预定关系。在接收机中，存在用于产生参考时钟频率和载波参考信号频率的单个频率源，在参考和载波参考频率之间存在固定的预定关系。发射机和接收机中固定的预定关系是相同的。

4. 发明授权

US07010058B2 Wireless local area network apparatus 失效
公开(公告)号：US07010058B2
公开(公告)日：2006-03-07
申请号：US10681267
申请日：2003-10-09
申请人： Wilhelmus J. M. Diepstraten , Hendrik van Bokhorst , Hans van Driest
发明人： Wilhelmus J. M. Diepstraten , Hendrik van Bokhorst , Hans van Driest
IPC分类号： H04L27/04 , H04L7/00
CPC分类号： H04W52/0216 , H04L7/04 , H04L27/04 , H04W56/009 , H04W76/27 , H04W84/12 , H04W88/02 , H04W88/022 , Y02D70/142
摘要： A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.

5. 发明授权

US5917865A Digital automatic gain control employing two-stage gain-determination process 失效
标题翻译：采用两级增益确定过程的数字自动增益控制
公开(公告)号：US5917865A
公开(公告)日：1999-06-29
申请号：US777654
申请日：1996-12-31
申请人： Robert John Kopmeiners , Hans van Driest
发明人： Robert John Kopmeiners , Hans van Driest
IPC分类号： H03G3/00 , H03G3/30 , H04B1/16 , H03L5/00
CPC分类号： H03G3/3052 , H03G3/001
摘要： For use in an automatic gain control that receives a digital signal from a digital circuit having a given dynamic range and develops therefrom a gain signal to be applied to a variable gain amplifier, an analyzing circuit for, and method of, determining a magnitude of the gain signal. The analyzing circuit includes: (1) a peak sampling subcircuit that determines an average peak value of the digital signal over variable periods of time and (2) a gain signal adjustment subcircuit, coupled to the peak sampling subcircuit, that operates in a selected one of: (a) a search mode in which the gain signal adjustment subcircuit decreases the periods of time and adjusts the gain signal at a first rate until the average peak value falls within the dynamic range of the digital circuit and (b) a direct step mode in which the gain signal adjustment subcircuit increases the periods of time and adjusts the gain signal at a second rate as a function of a deviation of the average peak value from a target average peak value, the first rate being faster than the second rate, the analyzing circuit thereby applying a two-stage gain determination process to the digital signal to approach the target average peak value.
摘要翻译：用于从具有给定动态范围的数字电路接收数字信号的自动增益控制，并从其产生要施加到可变增益放大器的增益信号，分析电路和确定其的幅度的方法增益信号。分析电路包括：（1）确定在可变时间段内的数字信号的平均峰值的峰值采样子电路和（2）耦合到峰值采样子电路的增益信号调整子电路，其在所选择的一个中工作：（a）搜索模式，其中增益信号调节分支电路减小时间段，并以第一速率调整增益信号，直到平均峰值落入数字电路的动态范围内，并且（b）直接步骤模式，其中所述增益信号调节子电路增加所述时间段，并且以所述平均峰值与目标平均峰值的偏差为函数，以第二速率调整所述增益信号，所述第一速率快于所述第二速率，分析电路由此对数字信号应用两级增益确定处理以接近目标平均峰值。

6. 发明授权

US5909462A System and method for improved spread spectrum signal detection 失效
标题翻译：改进扩频信号检测的系统和方法
公开(公告)号：US5909462A
公开(公告)日：1999-06-01
申请号：US775737
申请日：1996-12-31
申请人： Adriaan Kamerman , Hans van Driest
发明人： Adriaan Kamerman , Hans van Driest
IPC分类号： H04L27/22 , H04L12/28 , H04B15/00
CPC分类号： H04B1/707
摘要： For use in a direct sequence spread spectrum ("DSSS") receiver adapted to receive a differential phase shift keyed ("DPSK") packet on a channel, the DPSK packet having a training preamble and a data portion, a system to improve detection of the packet under degraded channel conditions, comprising: (1) a detection circuit that derives phase information from symbols in the packet and a weight that is a function of an estimated power profile for the channel and (2) a computation circuit that computes a weighted average for the phase information using the weight, the weighted average being power profile-based to allow the receiver to detect the data contained in the packet more reliably under the degraded channel conditions.
摘要翻译：为了用于在信道上接收差分相移键控（“DPSK”）分组的直接序列扩频（“DSSS”）接收机，DPSK分组具有训练前同步码和数据部分，所述分组在恶化的信道条件下，包括：（1）从所述分组中的符号导出相位信息的检测电路和作为所述信道的估计功率分布的函数的权重，以及（2）计算加权的使用权重的相位信息的平均值，加权平均值是基于功率曲线的，以允许接收机在劣化信道条件下更可靠地检测包中包含的数据。

7. 发明申请

US20100034326A1 Receiver for receiving data symbols having a symbol period 有权
标题翻译：用于接收具有符号周期的数据符号的接收器
公开(公告)号：US20100034326A1
公开(公告)日：2010-02-11
申请号：US12373243
申请日：2006-07-12
申请人： Hans van Driest , Cornelis Adrianus Henricus Maria van Puijenbroek
发明人： Hans van Driest , Cornelis Adrianus Henricus Maria van Puijenbroek
IPC分类号： H04L27/06
CPC分类号： H04L1/06 , H04B7/0811
摘要： A receiver and method for receiving symbols having a symbol period with duration SP comprising. N antenna signals are selected equally in time over a symbol period to obtain a combined antenna signal. An autocorrelation is performed on the combined antenna signal to obtain a combined signal. The combined signal is split into the corresponding antenna signal parts and subjected to an integration function. The output of the integration function is used the select the antenna signal with the best signal quality. The invention enables to perform an efficient antenna diversity circuit, which can partially be used for simultaneously preamble detection and frequency offset estimation.
摘要翻译：一种用于接收具有持续时间SP的符号周期的符号的接收机和方法。 N个天线信号在符号周期内在时间上被相等地选择以获得组合的天线信号。对组合的天线信号执行自相关以获得组合信号。组合信号被分成相应的天线信号部分并进行积分功能。使用积分功能的输出来选择具有最佳信号质量的天线信号。本发明能够执行有效的天线分集电路，其可以部分地用于同步前导码检测和频率偏移估计。

8. 发明授权

US07289578B2 Wireless local area network apparatus 失效
标题翻译：无线局域网设备
公开(公告)号：US07289578B2
公开(公告)日：2007-10-30
申请号：US11331919
申请日：2006-01-13
申请人： Wilhelmus J. M. Diepstraten , Hendrik van Bokhorst , Hans van Driest
发明人： Wilhelmus J. M. Diepstraten , Hendrik van Bokhorst , Hans van Driest
IPC分类号： H04L27/00 , H04L7/00 , H04B1/16
CPC分类号： H04W52/0216 , H04L7/04 , H04L27/04 , H04W56/009 , H04W76/27 , H04W84/12 , H04W88/02 , H04W88/022 , Y02D70/142
摘要： A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
摘要翻译：无线局域网设备包括发射机和接收机，其中接收机的操作与来自发射机的周期性信号精确同步。周期性信号包含指示在发送包含该数据的信号时发送器中定时器的状态的定时数据，并且该定时数据在由接收器接收时被从信号中检索并被加载在用于控制接收器的操作的定时器中。

9. 发明授权

US6115411A System and method for spread spectrum code position modulation and wireless local area network employing the same 失效
标题翻译：用于扩频码位置调制的系统和方法以及采用该方法的无线局域网
公开(公告)号：US6115411A
公开(公告)日：2000-09-05
申请号：US775836
申请日：1996-12-31
申请人： Hans van Driest
发明人： Hans van Driest
IPC分类号： H03M7/14 , H04B1/69 , H04B14/02 , H04J13/00 , H04L12/28 , H04L25/49 , H04Q7/22 , H04Q7/28 , H04B15/00
CPC分类号： H04L25/4902 , H04B1/69 , H04B14/026 , H04J13/0003 , H04J13/0077
摘要： A system for, and method of, generating a spread spectrum code position modulated waveform and a wireless local area network (LAN) containing the system or the method. The system includes: (1) a spread-spectrum encoder that receives and encodes portions of an information signal with a multi-chip code having a predetermined length to create therefrom a stream of sequences, each of the sequences having the predetermined length and (2) a transmitter that periodically transmits the each of the sequences at a time interval that differs from the predetermined length, a data rate of transmission of the information signal thereby allowed to increase.
摘要翻译：用于生成扩频码位置调制波形的系统和方法以及包含该系统或方法的无线局域网（LAN）。该系统包括：（1）扩频编码器，用具有预定长度的多芯片码接收和编码信息信号的部分，从而产生序列流，每个序列具有预定长度和（2 ）发送器，其以与预定长度不同的时间间隔周期性地发送每个序列，从而允许信息信号的传输的数据速率增加。

10. 发明授权

US5706428A Multirate wireless data communication system 失效
标题翻译：多速率无线数据通信系统
公开(公告)号：US5706428A
公开(公告)日：1998-01-06
申请号：US615408
申请日：1996-03-14
申请人： Jan Boer , Wilhelmus Josephus Diepstraten , Adriaan Kamerman , Hendrik van Bokhorst , Hans van Driest
发明人： Jan Boer , Wilhelmus Josephus Diepstraten , Adriaan Kamerman , Hendrik van Bokhorst , Hans van Driest
IPC分类号： H04B1/707 , H04L12/28 , H04L12/56 , H04Q1/30
CPC分类号： H04B1/707 , H04B2201/70703 , H04W28/22 , H04W4/12 , H04W84/12
摘要： A wireless LAN includes first stations adapted to operate at a 1 or a 2 Mbps data rate and second stations adapted to operate at a 1,2,5 or 8 Mbps data rate. The 1 and 2 Mbps rates use DBPSK and DQPSK modulation, respectively. The 5 and 8 Mbps rates use PPM/DQPSK modulation. All four data rates use direct sequence spread spectrum (DSSS) coding. All transmitted messages start with a preamble and header at the 1 Mbps rate. The header includes fields identifying the data rate for the data portion of the message, and a length field. For a 2 Mbps transmission the length field identifies the number of bytes in the data field. For a 5 or 8 Mbps the length field identifies the number of bytes in the data field which, if transmitted at 2 Mbps, would take the same transmission time of the data field, and is thus a fraction 2/5 or 2/8 of the actual number of the bytes. With this arrangements, all the stations are interoperable in a co-existent manner in the LAN.
摘要翻译：无线LAN包括适于以1或2Mbps数据速率操作的第一站和适于以1,2,5或8Mbps数据速率操作的第二站。 1和2Mbps速率分别使用DBPSK和DQPSK调制。 5和8 Mbps速率使用PPM / DQPSK调制。所有四种数据速率都使用直接序列扩频（DSSS）编码。所有发送的消息以1 Mbps速率从前同步码和报头开始。标题包括标识消息的数据部分的数据速率的字段和长度字段。对于2Mbps传输，长度字段标识数据字段中的字节数。对于5或8 Mbps，长度字段标识数据字段中的字节数，如果以2 Mbps发送，则将占用数据字段的相同传输时间，因此为小数+ E，fra 2/5 + EE或+ E，fra 2/8 + EE的实际字节数。通过这种安排，所有的台站可以在局域网中以共存的方式进行互操作。

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