公开(公告)号：US08442146B2

公开(公告)日：2013-05-14

申请号：US12911650

申请日：2010-10-25

申请人： Michael Mao Wang

发明人： Michael Mao Wang

IPC分类号： H04L27/10

CPC分类号： H04L25/0216 ,  H04L27/2647

摘要： Apparatus and methods for use in a wireless communication system are disclosed for reducing channel estimation noise in a device such as a wireless transceiver. A disclosed apparatus includes a processor that determines a channel activity portion and a noise portion of a channel estimation. The processor also determines a threshold noise level based on channel estimate values in the noise portion of the channel estimation. The processor compares channel estimate energy values in the channel estimation to the threshold noise level and sets each of the channel estimate energy values being less than the threshold noise level to a predetermined value such as zero in order to reduce or eliminate the noise. Similar methods are also disclosed.

摘要翻译： 公开了用于无线通信系统中的装置和方法，用于减少诸如无线收发器之类的装置中的信道估计噪声。 所公开的装置包括确定信道估计的信道活动部分和噪声部分的处理器。 处理器还基于信道估计的噪声部分中的信道估计值来确定阈值噪声电平。 处理器将信道估计中的信道估计能量值与阈值噪声电平进行比较，并将每个信道估计能量值小于阈值噪声电平设置为诸如零的预定值，以便减少或消除噪声。 还公开了类似的方法。

公开(公告)号：US08396151B2

公开(公告)日：2013-03-12

申请号：US11613955

申请日：2006-12-20

申请人： Michael Mao Wang

发明人： Michael Mao Wang

IPC分类号： H04B7/02

CPC分类号： H04B7/0837 ,  H04B17/327 ,  H04B17/364 ,  H04L25/0208 ,  H04L25/0212 ,  H04L27/2662 ,  H04L27/2695

摘要： Apparatus and methods for determining timing tracking in a multiple antenna wireless system are disclosed. Timing tracking is obtained, in particular, by determining at least two channel density profiles for signals respectively received by at least two antennas of multiple receive antenna wireless device. The channel density profiles are then combined, such as by summing, to form a composite channel density profile. The composite is, in turn, used by a timing tracking algorithm to determine a timing decision for setting the timing tracking in a transceiver device used in the multiple antenna wireless system. Use of a composite density profile affords the system increased resistance to channel dynamics such as fading, birth and death, which reduces degradation due to mistiming caused by such channel dynamics.

摘要翻译： 公开了一种用于确定多天线无线系统中的定时跟踪的装置和方法。 特别地，通过为由多个接收天线无线设备的至少两个天线分别接收的信号确定至少两个信道密度分布来获得定时跟踪。 然后，例如通过求和来组合信道密度分布，以形成复合信道密度分布。 该复合物又被定时跟踪算法用于确定用于在多天线无线系统中使用的收发器设备中设置定时跟踪的定时决定。 复合密度分布的使用使系统增加了对信道动力学的抵抗力，例如衰落，出生和死亡，从而减少由于这种信道动力学引起的错误导致的降级。

公开(公告)号：US08391410B2

公开(公告)日：2013-03-05

申请号：US11535940

申请日：2006-09-27

申请人： Michael Mao Wang

发明人： Michael Mao Wang

IPC分类号： H04L27/20 ,  H03K7/04 ,  H03K7/06 ,  H03K9/04 ,  H03K9/06 ,  H04L27/18

CPC分类号： H04L27/2613 ,  H03M13/271 ,  H03M13/2771 ,  H04L1/0041 ,  H04L1/0066 ,  H04L1/0069 ,  H04L1/0071 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/0083 ,  H04L25/0226 ,  H04L27/2626

摘要： Methods and apparatus for constructing a pilot symbol for a communication frame transmitted in a wireless communication system, such as an OFDM system, are disclosed. In particular, the methods and apparatus generate at least one pseudo-random noise sequence having at least a predetermined length, where the at least one pseudo-random noise sequence represents a system configuration of a wireless system. A time domain symbol sequence is modulated with the at least one pseudo-random noise sequence to create a timing acquisition pilot symbol. The modulated acquisition pilot symbol is further masked to a prescribed frequency profile and placed in a frame for wireless transmission. Accordingly, different system configurations can be communicated from a transmitter to a receiver with the acquisition pilot symbol modulated with correspondingly different pseudo-random noise sequences, while affording low complexity required to process the acquisition pilot symbol and a minimum peak to average power ratio when using QPSK modulation.

摘要翻译： 公开了在诸如OFDM系统的无线通信系统中发送的用于构建通信帧的导频符号的方法和装置。 特别地，所述方法和装置产生至少一个具有至少预定长度的伪随机噪声序列，其中至少一个伪随机噪声序列表示无线系统的系统配置。 利用至少一个伪随机噪声序列调制时域符号序列以产生定时获取导频符号。 调制获取导频符号被进一步屏蔽到规定的频率分布，并被放置在用于无线传输的帧中。 因此，不同的系统配置可以从发射机传送到接收机，其中采集导频符号用对应的不同的伪随机噪声序列进行调制，同时提供处理采集导频符号所需的低复杂度和使用时的最小峰均功率比 QPSK调制。

公开(公告)号：US08223623B2

公开(公告)日：2012-07-17

申请号：US11449945

申请日：2006-06-09

申请人： Michael Mao Wang

发明人： Michael Mao Wang

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/00

摘要： Systems and methods are provided for processing Time Domain Multiplexing Pilot symbols by employing complex accumulators to determine peak values which indicate the start of timing and frequency information. In an embodiment, a method is provided for timing acquisition in a wireless network. The method includes acquiring samples from an Orthogonal Frequency Division Multiplexing (OFDM) data packet over a predetermined period of time, where the samples include one or more TDM pilot symbols. The samples are then processed to determine a maximum value that indicates the TDM pilot symbol has been detected.

摘要翻译： 提供了系统和方法，用于通过采用复合累加器来确定指示定时和频率信息开始的峰值来处理时域多路复用导频符号。 在一个实施例中，提供了一种用于无线网络中的定时获取的方法。 该方法包括在预定时间段内从正交频分复用（OFDM）数据分组获取样本，其中样本包括一个或多个TDM导频符号。 然后处理样本以确定指示已经检测到TDM导频符号的最大值。

公开(公告)号：US08175123B2

公开(公告)日：2012-05-08

申请号：US11371837

申请日：2006-03-08

申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

IPC分类号： H04J3/08

CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

摘要： A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

摘要翻译： 公开了一种用于定位用于傅立叶变换函数的收集窗口的方法。 接收第一正交频分复用（OFDM）符号和第二OFDM符号。 第一OFDM符号包括多个频分复用（FDM）符号。 第一OFDM符号的特征在于以下至少两个：延迟扩展，第一到达路径（FAP）或最后到达路径（LAP）。 从信道脉冲响应估计信道位置。 选择相对于通道位置的点。 收集窗口的开始位于所选点处的第二OFDM符号。 或者，如果延迟扩展小于预定长度，则使用第一算法在相对于信道位置的第一位置处选择点。 如果延迟扩展大于预定长度，则使用第二算法在相对于信道位置的第二位置处选择所选择的点。

公开(公告)号：US20100027486A1

公开(公告)日：2010-02-04

申请号：US12446679

申请日：2007-10-24

申请人： Alexei Gorokhov ,  Aamod Khandekar ,  Michael Mao Wang

发明人： Alexei Gorokhov ,  Aamod Khandekar ,  Michael Mao Wang

IPC分类号： H04W72/12

CPC分类号： H04B1/7075 ,  H04B2201/70701

摘要： System(s) and method(s) are provided to facilitate generating and processing acquisition pilots in wireless communications. Acquisition pilots that convey timing and frequency synchronization information, wireless system acquisition and system determination information are modulated with pseudorandom sequences. The R bits of information carried by the acquisition pilot that conveys system determination information are augmented with T bits that convey a counter index associated with the system timing of superframes transmitted from an access point. The processing overhead resulting from the addition of the T bits is offset by the advantages afforded to a wireless communication. Salient advantages include: (i) processing gain at a receiver for communication in a specific sector during asynchronous operation, (ii) packet boundary determination through the counter field values, and (iii) initialization of various pseudorandom registers employed for communication.

摘要翻译： 提供系统和方法以便于在无线通信中生成和处理采集导频。 采用伪随机序列调制传送定时和频率同步信息的采集导频，无线系统采集和系统确定信息。 传送系统确定信息的采集导频携带的R位的信息用传递与从接入点发送的超帧的系统定时相关联的计数器索引的T比特来增大。 由于添加T位而产生的处理开销被提供给无线通信的优点所抵消。 显着的优点包括：（i）在异步操作期间处理在特定扇区中的通信处理增益，（ii）通过计数器字段值确定分组边界，以及（iii）用于通信的各种伪随机寄存器的初始化。

公开(公告)号：US20080130805A1

公开(公告)日：2008-06-05

申请号：US11613955

申请日：2006-12-20

申请人： Michael Mao Wang

发明人： Michael Mao Wang

IPC分类号： H04B1/10 ,  H04L27/06

CPC分类号： H04B7/0837 ,  H04B17/327 ,  H04B17/364 ,  H04L25/0208 ,  H04L25/0212 ,  H04L27/2662 ,  H04L27/2695

摘要： Apparatus and methods for determining timing tracking in a multiple antenna wireless system are disclosed. Timing tracking is obtained, in particular, by determining at least two channel density profiles for signals respectively received by at least two antennas of multiple receive antenna wireless device. The channel density profiles are then combined, such as by summing, to form a composite channel density profile. The composite is, in turn, used by a timing tracking algorithm to determine a timing decision for setting the timing tracking in a transceiver device used in the multiple antenna wireless system. Use of a composite density profile affords the system increased resistance to channel dynamics such as fading, birth and death, which reduces degradation due to mistiming caused by such channel dynamics.

摘要翻译： 公开了一种用于确定多天线无线系统中的定时跟踪的装置和方法。 特别地，通过为由多个接收天线无线设备的至少两个天线分别接收的信号确定至少两个信道密度分布来获得定时跟踪。 然后，例如通过求和来组合信道密度分布，以形成复合信道密度分布。 该复合物又被定时跟踪算法用于确定用于在多天线无线系统中使用的收发器设备中设置定时跟踪的定时决定。 复合密度分布的使用使系统增加了对信道动力学的抵抗力，例如衰落，出生和死亡，从而减少由于这种信道动力学引起的错误导致的降级。

公开(公告)号：US6125137A

公开(公告)日：2000-09-26

申请号：US151610

申请日：1998-09-11

申请人： Michael Mao Wang ,  Tyler Brown

发明人： Michael Mao Wang ,  Tyler Brown

IPC分类号： H04B1/7115 ,  H04B1/7117 ,  A61F2/06 ,  H04L27/30

CPC分类号： H04B1/7115 ,  H04B1/7117

摘要： A base station receiver assembly (400) for performing a signal search, which operates in a coherent code division multiple access (CDMA) wireless communication system conveying a mobile communication signal is disclosed. The assembly (400) includes a multipath signal searcher (200), a receiver (300), and an energy adjustment generator (490). The energy adjustment generator operates to combine an energy metric (241) from the multipath signal searcher (200) with a symbol match count (447) to yield a signal (448) for weighting inputs to a finger manager (260). The symbol match count (447) is based on a count, resulting from a comparison of a number of times an output from the multipath signal searcher (200) matched an output from the receiver (300). The symbol match count (447) is representative of a likelihood that a time offset selected by the finger manager (260) corresponds to a time offset of the mobile communication signal (107).

摘要翻译： 公开了一种用于执行在传送移动通信信号的相干码分多址（CDMA）无线通信系统中操作的信号搜索的基站接收机组件（400）。 组件（400）包括多径信号搜索器（200），接收器（300）和能量调节发生器（490）。 能量调节发生器操作以将来自多路径信号搜索器（200）的能量度量（241）与符号匹配计数（447）组合，以产生用于加权到手指管理器（260）的输入的信号（448）。 符号匹配计数（447）基于由来自多径信号搜索器（200）的输出与来自接收器（300）的输出相匹配的次数的比较而产生的计数。 符号匹配计数（447）表示由手指管理器（260）选择的时间偏移对应于移动通信信号（107）的时间偏移的可能性。

公开(公告)号：US6108324A

公开(公告)日：2000-08-22

申请号：US158486

申请日：1998-09-22

申请人： Tyler A. Brown ,  Michael Mao Wang

发明人： Tyler A. Brown ,  Michael Mao Wang

IPC分类号： H04B1/7075 ,  H04B1/711 ,  H04B1/7117 ,  H04B7/216

CPC分类号： H04B1/7075 ,  H04B1/711 ,  H04B1/7117

摘要： A search metric adjustor (401) for use in a base station receiver assembly (400) which operates in a CDMA wireless communication system conveying a mobile communication signal (107), is disclosed. The search metric adjustor (401) produces an adjusted energy value (490) that is utilized by a sorter (265) in a receiver signal searcher (200) to select a set of valid time offsets at which effective demodulation of the mobile communication signal (107) may occur. The search metric adjustor (401) compares a first plurality of Walsh symbol energy values (245), output from the receiver signal searcher (200), to a second plurality of Walsh symbol energy values (342), output from a spread spectrum receiver (300). The comparison yields a walsh symbol match count (470), correlated to a predetermined energy value (480) which is then added to an energy metric (241) to produce the adjusted energy value (490).

摘要翻译： 公开了一种用于在传送移动通信信号（107）的CDMA无线通信系统中操作的基站接收机组件（400）中的搜索度量调节器（401）。 搜索度量调节器（401）产生由接收机信号搜索器（200）中的分类器（265）利用的调整能量值（490），以选择一组有效的时间偏移量，在该时间偏移量处有效地解调移动通信信号 107）。 搜索度量调节器（401）将从接收机信号搜索器（200）输出的第一多个沃尔什符号能量值（245）与从扩展频谱接收器（200）输出的第二多个沃尔什符号能量值（342）进行比较 300）。 比较产生与预定能量值（480）相关联的沃尔什符号匹配计数（470），然后将其加到能量度量（241）以产生经调节的能量值（490）。

公开(公告)号：US6084904A

公开(公告)日：2000-07-04

申请号：US900269

申请日：1997-07-25

申请人： Michael Mao Wang ,  Fuyun Ling ,  Robert T. Love ,  Lee Michael Proctor

发明人： Michael Mao Wang ,  Fuyun Ling ,  Robert T. Love ,  Lee Michael Proctor

IPC分类号： H04B1/10 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

CPC分类号： H04W52/125 ,  H04B1/1027

摘要： A method of adjusting a power control setpoint threshold (216) in a wireless communication system is provided. The method includes the steps of receiving at a receiver, a communication signal from a mobile communication unit to form a received communication signal, generating a first signal quality indicator (193) based on the received communication signal, generating a second signal quality indicator (194) based on the received communication signal, and generating an estimated signal-to-noise ratio (98). The method further includes setting a predetermined reference region (605) centered around a second signal quality indicator reference (206) where the second signal quality indicator reference (206) is related to the first signal quality indicator (193), and adjusting the power control setpoint threshold (216) based on a comparison between the second quality indicator (194) and the predetermined reference region (605).

摘要翻译： 提供了一种在无线通信系统中调整功率控制设定点阈值（216）的方法。 该方法包括以下步骤：在接收机处接收来自移动通信单元的通信信号以形成接收到的通信信号;基于所接收的通信信号产生第一信号质量指示符（193）;产生第二信号质量指示符（194 ），并且产生估计的信噪比（98）。 该方法还包括设置以第二信号质量指示符参考（206）为中心的第二信号质量指示符参考（206）为中心的预定参考区域（605），其中第二信号质量指示符参考（206）与第一信号质量指示符（193）相关，并且调整功率控制 基于第二质量指示符（194）和预定参考区域（605）之间的比较的设定点阈值（216）。