公开(公告)号：US07130343B2

公开(公告)日：2006-10-31

申请号：US10259711

申请日：2002-09-27

申请人： Michael Schmidt ,  Eric Sachse ,  Uwe Eckhardt

发明人： Michael Schmidt ,  Eric Sachse ,  Uwe Eckhardt

IPC分类号： H03H7/40 ,  H03D1/04

CPC分类号： H04L25/03025 ,  H04L23/02 ,  H04L25/0202 ,  H04L2025/0349 ,  H04L2025/0377 ,  H04W84/12

摘要： A wireless local area network receiver is provided that has an interference reduction unit for reducing interchip interference in a received signal that is modulated using a complementary code keying technique such as CCK-11. The interference reduction unit comprises a decision feedback equalizer that has a feedforward filter for reducing precursor interference and a feedback filter for reducing postcursor interference in the received signal. The receiver may perform channel estimation to optimize the filter coefficients during the preambles of the incoming sequence.

公开(公告)号：US07242711B2

公开(公告)日：2007-07-10

申请号：US10464987

申请日：2003-06-19

申请人： Uwe Eckhardt ,  Michael Schmidt ,  Eric Sachse

发明人： Uwe Eckhardt ,  Michael Schmidt ,  Eric Sachse

IPC分类号： H03H7/40

CPC分类号： H04L25/03057 ,  H03H17/0294 ,  H04L2025/0349 ,  H04L2025/03617

摘要： An improved decision feedback equalization technique is provided that may be used in data communications receivers such as those in WLAN (Wireless Local Area Network) systems. The decision feedback equalizer comprises a feedforward filter that is connected to receive an input data signal and output a filter representation thereof. The feedforward filter has a filter characteristic that depends on filter coefficient data. The decision feedback equalizer further comprises a filter coefficient computation unit for generating the filter coefficient data and outputting the generated data to the feedforward filter. At least one data processing circuit is provided that receives a mode switch signal for switching its operational mode. The data processing circuit is arranged for performing a feedforward filter function in one operational mode and a filter coefficient computation function in another operational mode.

摘要翻译： 提供了可用于诸如WLAN（无线局域网）系统中的数据通信接收机的改进的判决反馈均衡技术。 判决反馈均衡器包括前馈滤波器，其被连接以接收输入数据信号并输出​​其滤波器表示。 前馈滤波器具有取决于滤波器系数数据的滤波器特性。 决策反馈均衡器还包括滤波器系数计算单元，用于产生滤波器系数数据并将生成的数据输出到前馈滤波器。 提供至少一个数据处理电路，其接收用于切换其操作模式的模式切换信号。 数据处理电路被配置为在一个操作模式下执行前馈滤波器功能，并且在另一操作模式中执行滤波器系数计算功能。

公开(公告)号：US07167535B2

公开(公告)日：2007-01-23

申请号：US10327156

申请日：2002-12-20

申请人： Eric Sachse ,  Uwe Eckhardt ,  Ingo Kühn

发明人： Eric Sachse ,  Uwe Eckhardt ,  Ingo Kühn

IPC分类号： H03D3/24

CPC分类号： H04L27/0014 ,  H04L27/227 ,  H04L2027/0034 ,  H04L2027/004 ,  H04L2027/0069

摘要： A WLAN (Wireless Local Area Network) receiver with a synchronization unit is provided, wherein the synchronization unit comprises a frequency error correction unit configured to perform a frequency error correction process, a phase error correction unit configured to perform a phase error correction process, a filter circuit capable of applying one of at least two different filter transfer functions, wherein a first one of said at least two different filter transfer functions is a frequency error correction filter transfer function for use in said frequency error correction process and a second one of said at least two different filter transfer functions is a phase error correction filter transfer function for use in said phase error correction process, and a controller unit connected to said filter circuit to select one of said at least two different filter transfer functions.

摘要翻译： 提供了具有同步单元的WLAN（Wireless Local Area Network，无线局域网））接收机，其中同步单元包括：频率误差校正单元，被配置为执行频率误差校正处理;相位误差校正单元，被配置为执行相位误差校正处理; 滤波器电路，其能够应用至少两个不同的滤波器传递函数中的一个，其中所述至少两个不同的滤波器传递函数中的第一个是用于所述频率误差校正处理的频率误差校正滤波器传递函数，并且所述第二个 至少两个不同的滤波器传递函数是用于所述相位误差校正处理的相位误差校正滤波器传递函数，以及连接到所述滤波器电路以选择所述至少两个不同滤波器传递函数之一的控制器单元。

公开(公告)号：US07184496B2

公开(公告)日：2007-02-27

申请号：US10464965

申请日：2003-06-19

申请人： Uwe Eckhardt ,  Eric Sachse ,  Ingo Kühn

发明人： Uwe Eckhardt ,  Eric Sachse ,  Ingo Kühn

IPC分类号： H03D1/00

CPC分类号： H04B1/708 ,  H04B1/709 ,  H04B1/7093 ,  H04L23/02

摘要： A complementary code decoder technique is provided where the encoded input data is first parallelized. From the parallelized data, correlation values are generated by a correlator circuit that is capable of changing its correlation characteristics depending on at least one control signal. Different control signals are sequentially provided to the correlator circuit thereby driving the correlator circuit to sequentially generate multiple correlation values from the parallelized data, based on different correlation characteristics. From the multiple correlation values, the correlation value that represents the optimum correlation is identified. This technique significantly reduces the gate count of the decoder structure, thus saving chip area and manufacturing costs.

摘要翻译： 提供互补码解码技术，其中编码的输入数据首先并行化。 根据并行化数据，相关值由能够根据至少一个控制信号改变其相关特性的相关器电路产生。 根据不同的相关特性，将不同的控制信号顺序地提供给相关器电路，从而驱动相关器电路从并行数据顺序地产生多个相关值。 从多个相关值中，识别表示最佳相关性的相关值。 该技术显着降低了解码器结构的门数，从而节省了芯片面积和制造成本。

公开(公告)号：US07187724B2

公开(公告)日：2007-03-06

申请号：US10285925

申请日：2002-11-01

申请人： Menno Mennenga ,  Uwe Eckhardt ,  Michael Schmidt

发明人： Menno Mennenga ,  Uwe Eckhardt ,  Michael Schmidt

IPC分类号： H03K9/00

CPC分类号： H04L27/2647

摘要： An average tracking mechanism for a data communication receiver is provided. The average tracking mechanism of the receiver is connected to receive an input stream of data samples and is adapted to keep track of an average over a predefined number of most recently received data samples. The average tracking mechanism comprises a calculation unit that is adapted to calculate an approximate value of the average and a storage unit for storing calculated approximate values. The calculation unit is adapted to calculate the approximate value by retrieving a previously calculated approximate value from the storage unit and calculating a weighted sum of the retrieved approximate value and a current data sample. The average approximation technique may be used in a comb filter of a preamble detector in a WLAN receiver.

摘要翻译： 提供了一种数据通信接收机的平均跟踪机制。 接收机的平均跟踪机制被连接以接收数据采样的输入流，并且适于在预定数量的最近接收的数据样本上跟踪平均值。 平均跟踪机构包括适于计算平均值的近似值的计算单元和用于存储计算出的近似值的存储单元。 计算单元适于通过从存储单元检索先前计算的近似值并计算检索到的近似值和当前数据样本的加权和来计算近似值。 平均近似技术可以用在WLAN接收机中的前同步码检测器的梳状滤波器中。

公开(公告)号：US07327717B2

公开(公告)日：2008-02-05

申请号：US10185354

申请日：2002-06-27

申请人： Jörg Borowski ,  Uwe Eckhardt ,  Michael Schmidt ,  Frank Poegel ,  Menno Mennenga

发明人： Jörg Borowski ,  Uwe Eckhardt ,  Michael Schmidt ,  Frank Poegel ,  Menno Mennenga

IPC分类号： H04Q7/24 ,  H04B1/00 ,  H04J3/06

CPC分类号： H04L27/0014 ,  H04B1/7073 ,  H04B1/70758 ,  H04B7/0811 ,  H04L2025/0349 ,  H04L2027/0065 ,  H04L2027/0095 ,  H04W88/08

摘要： A WLAN (Wireless Local Area Network) receiver is provided that provides at least two acquisition units and at least two tracking units. The acquisition units perform a synchronization acquisition process, and the tracking units perform a synchronization tracking process. The acquisition units are arranged for being operated sequentially while the tracking units are arranged for being operated simultaneously. In an embodiment, frequency and phase error correction may be performed separately, and those units that operate at higher sampling rates may be located before lower-rate units. The synchronization process may include data-aided as well as non data-aided algorithms.

摘要翻译： 提供了WLAN（无线局域网）接收器，其提供至少两个采集单元和至少两个跟踪单元。 采集单元执行同步捕获处理，并且跟踪单元执行同步跟踪处理。 采集单元被布置成顺序地操作，而跟踪单元被布置成同时操作。 在一个实施例中，可以分别执行频率和相位误差校正，并且以较低速率单元位于较高采样速率下工作的那些单元。 同步过程可以包括数据辅助以及非数据辅助算法。

公开(公告)号：US07418054B2

公开(公告)日：2008-08-26

申请号：US10464990

申请日：2003-06-19

申请人： Uwe Eckhardt ,  Matthias Lenk ,  Michael Grell

发明人： Uwe Eckhardt ,  Matthias Lenk ,  Michael Grell

IPC分类号： H04L27/04 ,  H04B7/005

CPC分类号： H04L25/05 ,  H04W52/08

摘要： A WLAN (Wireless Local Area Network) transmitter or another data communications apparatus is provided that includes a transmission section that is configured to generate signals to be transmitted, and a control section that is connected to the transmission section to control the transmission section dependent on at least two transmission parameters. The control section comprises a state transition controller that is configured to step through a plurality of predefined control states. The control section is configured to apply different transmission parameter modification mechanisms in different control states. The state transition controller is configured to determine the respective next control states based on transmission success and failure statistics.

摘要翻译： 提供了一种WLAN（Wireless Local Area Network，无线局域网）发射机或另一数据通信装置，该装置包括被配置为产生要发送的信号的发送部分，以及连接到发送部分的控制部分， 至少两个传输参数。 控制部分包括状态转移控制器，其被配置成跨越多个预定义的控制状态。 控制部分被配置为在不同的控制状态下应用不同的传输参数修改机制。 状态转移控制器被配置为基于传输成功和失败统计来确定相应的下一个控制状态。

公开(公告)号：US07180964B2

公开(公告)日：2007-02-20

申请号：US10286133

申请日：2002-11-01

申请人： Joerg Borowski ,  Uwe Eckhardt ,  Menno Mennenga

发明人： Joerg Borowski ,  Uwe Eckhardt ,  Menno Mennenga

IPC分类号： H03D3/22 ,  H04L27/22 ,  H04L27/18 ,  H04L27/10

CPC分类号： H04L27/0014 ,  H04L2027/0028 ,  H04L2027/0067

摘要： An error correction technique for data communication receivers such as WLAN (Wireless Local Area Network) receivers is provided. The error correction technique is for correcting a frequency and/or phase error in an incoming digitally modulated signal. A constellation manipulator is provided that is adapted to manipulate the phase constellation system of the incoming digitally modulated system by mapping each constellation point of the phase constellation system to a predefined range of phase angles. The predefined range has a width of less than 2π. Further, an error detector is provided that is connected to receive data from the constellation manipulator. The data pertains to the manipulated phase constellation system. The error detector is adapted to evaluate the data to detect the frequency and/or phase error.

摘要翻译： 提供了诸如WLAN（无线局域网）接收机之类的数据通信接收机的纠错技术。 误差校正技术用于校正输入的数字调制信号中的频率和/或相位误差。 提供了一种星座操纵器，其适于通过将相位星座系统的每个星座点映射到预定义的相位角范围来操纵输入的数字调制系统的相位星座系统。 预定范围的宽度小于2pi。 此外，提供了一个连接以从星座操纵器接收数据的误差检测器。 数据属于操纵相星座系统。 误差检测器适于评估数据以检测频率和/或相位误差。

公开(公告)号：US20050169480A1

公开(公告)日：2005-08-04

申请号：US10899200

申请日：2004-07-26

申请人： Ingo Kuehn ,  Uwe Eckhardt ,  Axel Wachtler ,  Falk Tischer

发明人： Ingo Kuehn ,  Uwe Eckhardt ,  Axel Wachtler ,  Falk Tischer

IPC分类号： H04K1/04 ,  H04L9/28 ,  H04L12/28 ,  H04L29/06

CPC分类号： H04L63/0435 ,  H04L63/06 ,  H04W12/02 ,  H04W12/04 ,  H04W84/12

摘要： A ciphering key management technique for use in a WLAN receiver is provided where a hash table is stored that has a first and a second table portion. The first table portion stores transmitter address data and the second table portion stores at least one cipher key. It is determined whether a transmitter address matches transmitter address data in the first table portion, and if so, a corresponding cipher key stored in the second table portion is determined for use in decrypting the received data. The hash table technique allows for a fast search for the correct cipher key. Embodiments are described that allow for dynamically adding and removing keys without blocking the search.

摘要翻译： 提供了一种在WLAN接收机中使用的加密密钥管理技术，其中存储具有第一和第二表部分的哈希表。 第一表部分存储发射机地址数据，第二表部分存储至少一个加密密钥。 确定发射机地址是否匹配第一表部分中的发射机地址数据，如果是，则确定存储在第二表部分中的相应密码密钥用于解密所接收的数据。 散列表技术允许快速搜索正确的密钥。 描述了允许动态地添加和移除键而不阻止搜索的实施例。

公开(公告)号：US08811618B2

公开(公告)日：2014-08-19

申请号：US10899200

申请日：2004-07-26

申请人： Ingo Kuehn ,  Uwe Eckhardt ,  Axel Wachtler ,  Falk Tischer

发明人： Ingo Kuehn ,  Uwe Eckhardt ,  Axel Wachtler ,  Falk Tischer

IPC分类号： H04L29/06

CPC分类号： H04L63/0435 ,  H04L63/06 ,  H04W12/02 ,  H04W12/04 ,  H04W84/12

摘要： A ciphering key management technique for use in a WLAN receiver is provided where a hash table is stored that has a first and a second table portion. The first table portion stores transmitter address data and the second table portion stores at least one cipher key. It is determined whether a transmitter address matches transmitter address data in the first table portion, and if so, a corresponding cipher key stored in the second table portion is determined for use in decrypting the received data. The hash table technique allows for a fast search for the correct cipher key. Embodiments are described that allow for dynamically adding and removing keys without blocking the search.

摘要翻译： 提供了一种在WLAN接收机中使用的加密密钥管理技术，其中存储具有第一和第二表部分的哈希表。 第一表部分存储发射机地址数据，第二表部分存储至少一个加密密钥。 确定发射机地址是否匹配第一表部分中的发射机地址数据，如果是，则确定存储在第二表部分中的相应密码密钥用于解密所接收的数据。 散列表技术允许快速搜索正确的密钥。 描述了允许动态地添加和移除键而不阻止搜索的实施例。