公开(公告)号：US20070058623A1

公开(公告)日：2007-03-15

申请号：US11301522

申请日：2005-12-13

申请人： Rajendra Moorti ,  Rohit Gaikwad ,  Amit Bagchi

发明人： Rajendra Moorti ,  Rohit Gaikwad ,  Amit Bagchi

IPC分类号： H04L12/56

CPC分类号： H04W28/18 ,  H04W24/00

摘要： Frame processing for a wireless communication system. The frame processing includes detecting reception of a frame based on a portion of a preamble of a frame, wherein the frame includes a preamble and a data payload. With detecting the reception of a frame, determining a frame type of a plurality of frame types from at least the portion of the preamble. Processing a remaining portion of the preamble in accordance with the frame type to determine payload processing parameters, and processing the data payload based on the payload processing parameters.

摘要翻译： 无线通信系统的帧处理。 帧处理包括基于帧的前导码的一部分来检测帧的接收，其中该帧包括前同步码和数据有效载荷。 通过检测帧的接收，从前导码的至少一部分确定多种帧类型的帧类型。 根据帧类型处理前导码的剩余部分以确定有效载荷处理参数，以及基于有效载荷处理参数来处理数据有效载荷。

公开(公告)号：US20060164971A1

公开(公告)日：2006-07-27

申请号：US11188803

申请日：2005-07-26

申请人： Rajendra Moorti ,  Rohit Gaikwad

发明人： Rajendra Moorti ,  Rohit Gaikwad

IPC分类号： H04J11/00

CPC分类号： H04L27/2613 ,  H04B7/04 ,  H04B2201/70701 ,  H04J13/10 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0226

摘要： A network device for transmitting a set of known pilot symbols in a communications system utilizing a plurality of transmit sources. The network device includes generating means for generating the set of known pilot symbols to be transmitted for each of the plurality of transmit sources and inserting means for inserting pilot symbols for each of the plurality of transmit sources. The network device also includes creating means for creating a near to full orthogonal matrix over time and frequency using the fewest number of pilot symbols. The pilot symbols are used for at least one of channel, frequency, and phase tracking at a receiving station.

摘要翻译： 一种用于在利用多个发射源的通信系统中发送一组已知导频符号的网络设备。 网络设备包括产生装置，用于产生要针对多个发射源中的每一个发送的已知导频符号组，以及用于插入用于多个发射源中的每一个的导频符号的插入装置。 网络设备还包括创建用于使用最少数量的导频符号在时间和频率上创建接近完全正交矩阵的装置。 导频符号用于接收站的信道，频率和相位跟踪中的至少一个。

公开(公告)号：US20070019749A1

公开(公告)日：2007-01-25

申请号：US11402571

申请日：2006-04-12

申请人： Rohit Gaikwad ,  Rajendra Moorti ,  Jason Trachewsky

发明人： Rohit Gaikwad ,  Rajendra Moorti ,  Jason Trachewsky

IPC分类号： H04L27/28 ,  H04L27/06

CPC分类号： H04L27/2657

摘要： Carrier detection applicable for SISO, MIMO, MISO, and SIMO communications. A novel approach is presented to perform carrier detection for a signal found in any of a wide variety of communication systems including single-input-multiple-output (SISO), multiple-input-multiple-output (MIMO), multiple-input-single-output (MISO) single-input-multiple-output (SIMO), communication systems. This novel approach to performing carrier detection is more robust than those approaches existent in the art. By employing normalization with respect to power in determined a modified correlation function, there is less susceptibility to false detects. Also, this approach is quite robust to any circuitry DC offsets that may undesirably exist within a communication device that undergoes operational changes due to a variety of factors including environmental perturbations and/or changes in processing circuitry within the communication device (e.g., changes in gain control).

摘要翻译： 载波检测适用于SISO，MIMO，MISO和SIMO通信。 提出了一种新颖的方法来对在各种各样的通信系统中发现的信号执行载波检测，包括单输入多输出（SISO），多输入多输出（MIMO），多输入单 - 输出（MISO）单输入多输出（SIMO），通信系统。 执行载波检测的这种新颖的方法比本领域中存在的那些方法更加鲁棒。 通过在确定修正的相关函数中使用关于功率的归一化，对错误检测的敏感性较小。 此外，该方法对于由于各种因素（包括环境扰动和/或通信设备内的处理电路的变化）而经历操作改变的通信设备中可能不期望地存在的任何电路DC偏移是相当鲁棒的 控制）。

公开(公告)号：US20060285478A1

公开(公告)日：2006-12-21

申请号：US11312512

申请日：2005-12-21

申请人： Rohit Gaikwad ,  Rajendra Moorti

发明人： Rohit Gaikwad ,  Rajendra Moorti

IPC分类号： H04J11/00

CPC分类号： H04L27/2657 ,  H04B7/04 ,  H04L27/2675 ,  H04L27/2679

摘要： A method is disclosed for correcting carrier frequency offset (CFO) in a received data packet that includes one or more M data streams. The data packet has a payload portion preceded by a preamble portion, the payload portion having a plurality of data symbols (L) each of which include a plurality of data tones (K). The method comprises, making a per-stream preamble CFO estimate for each data stream by correlating repeated preamble portions that precede the data packet. The per-stream preamble CFO estimates are weighted and averaged to obtain a single preamble CFO estimate. Any CFO in each received data stream is then corrected according to the preamble CFO estimate. Additionally, for an lth data symbol in a data packet, a per-tone CFO estimate is derived and successively averaged over frequency (tones), time (symbols) and space (data steams) to derive data CFO estimate pdata. Any CFO in each received data stream may be corrected according to the data CFO estimate, and/or the preamble CFO estimate.

摘要翻译： 公开了一种用于校正包括一个或多个M个数据流的接收数据分组中的载波频率偏移（CFO）的方法。 数据分组具有前导码部分之前的有效载荷部分，该有效载荷部分具有多个数据符号（L），每个数据符号包括多个数据音调（K）。 该方法包括：通过将在数据分组之前的重复前同步码部分相关联，为每个数据流进行每流前导码CFO估计。 对每流前导性CFO估计进行加权和平均，以获得单个前导CFO估计。 然后根据前导CFO估计来校正每个接收到的数据流中的任何CFO。 此外，对于数据分组中的第一个数据符号，导出每音调CFO估计，并且通过频率（音调），时间（符号）和空间（数据流）连续平均以导出数据 CFO估计p _{数据。 可以根据数据CFO估计和/或前导CFO估计来校正每个接收到的数据流中的任何CFO。}

公开(公告)号：US20070019750A1

公开(公告)日：2007-01-25

申请号：US11402572

申请日：2006-04-12

申请人： Rohit Gaikwad ,  Rajendra Moorti

发明人： Rohit Gaikwad ,  Rajendra Moorti

IPC分类号： H04K1/10 ,  H04L1/02 ,  H04L27/06

CPC分类号： H04B7/0851

摘要： Multiple-input-multiple-output (MIMO) timing recovery. A novel approach is presented to perform timing recovery when processing the multiple received signals within a MIMO communication device. This may be implemented for a singular received signal, or a plurality of received signal streams. In addition, this timing recovery may be performed in conjunction with carrier detection to provide more robust performance. Alternatively, indicia and/or signals corresponding to carrier detection of these signals may be provided to timing recovery functionality from carrier detection functionality external to the timing recovery functionality. Certain processing and analysis is performed on a modified correlation function that is generated using samples of moving windows that pass over symbols of a packet. Based on this analysis of the modified correlation function, and sometimes in conjunction with one or more carrier detect signals, timing recovery may be performed thereby locating the point at which decoding of the packet may be performed.

摘要翻译： 多输入多输出（MIMO）定时恢复。 提出了一种新颖的方法来在MIMO通信设备中处理多个接收信号时执行定时恢复。 这可以针对单个接收信号或多个接收信号流来实现。 此外，该定时恢复可以结合载波检测来执行，以提供更强大的性能。 或者，可以将与这些信号的载波检测对应的标记和/或信号提供给定时恢复功能，从定时恢复功能外部的载波检测功能。 对使用通过分组的符号的移动窗口的样本生成的修改的相关函数执行某些处理和分析。 基于对修正的相关函数的这种分析，并且有时结合一个或多个载波检测信号，可以执行定时恢复，从而定位可以执行分组的解码的点。

公开(公告)号：US20070002981A1

公开(公告)日：2007-01-04

申请号：US11312510

申请日：2005-12-21

申请人： Rohit Gaikwad ,  Rajendra Moorti

发明人： Rohit Gaikwad ,  Rajendra Moorti

IPC分类号： H03D1/04

CPC分类号： H04L27/2657 ,  H04L27/2675 ,  H04L27/2679 ,  H04L2027/003 ,  H04L2027/0059 ,  H04L2027/0067 ,  H04L2027/0095

摘要： A method is described for correcting sampling frequency offset (SFO) of a data packet in a communications system where carrier frequency (fc) and sampling frequency (fs) are driven by a common clock source. The method comprises, for each lth symbol in the data packet, estimating carrier frequency offset (CFO) in a received data packet. From the CFO estimate, an SFO estimate is derived, wherein the SFO is approximately equal to fs multiplied by said CFO estimate, and divided by fc. An SFO phase correction is generated according to the SFO estimate for each kth tone in a data stream. The SFO phase correction is then applied to each received data stream.

摘要翻译： 描述了一种用于校正通信系统中的数据分组的采样频率偏移（SFO）的方法，其中驱动载波频率（f SUB）和采样频率（f> s） 由公共时钟源。 对于数据分组中的每个第l0个符号，该方法包括估计接收的数据分组中的载波频率偏移（CFO）。 根据CFO估计，导出SFO估计，其中SFO近似等于所述CFO估计的乘积，并除以f C c。 根据数据流中的每个第k个音调的SFO估计来生成SFO相位校正。 然后将SFO相位校正应用于每个接收到的数据流。

公开(公告)号：US20070140212A1

公开(公告)日：2007-06-21

申请号：US11705146

申请日：2007-02-12

申请人： Rohit Gaikwad ,  Rajendra Moorti

发明人： Rohit Gaikwad ,  Rajendra Moorti

IPC分类号： H04J3/06

CPC分类号： H04L27/2657 ,  H04L27/2675 ,  H04L27/2679 ,  H04L2027/003 ,  H04L2027/0059 ,  H04L2027/0067 ,  H04L2027/0095

摘要： A communication system, including a receiver, is described having a common clock source that drives both carrier frequency (fc) and sampling frequency (fs). The receiver comprises a first signal processing stage for down converting a received data stream to baseband, a demodulation module coupled to the first signal processing stage for demodulating the down-converted data stream, and a second signal processing stage coupled to the demodulation module for decoding the demodulated data stream. Additionally, the receiver includes a carrier frequency offset (CFO) estimation module and a sampling frequency offset (SFO) correction module. The SFO correction module receives an estimated CFO, and then determines an SFO correction based on the estimated CFO, and applies the SFO correction to the received data stream.

摘要翻译： 描述了包括接收器的通信系统，其具有驱动载波频率（f SUB）和采样频率（f SUB）的公共时钟源。 接收机包括用于将接收的数据流下变频到基带的第一信号处理级，耦合到第一信号处理级的解调模块以解调下变频数据流的解调模块，以及耦合到解调模块的第二信号处理级，用于解码 解调的数据流。 另外，接收机包括载频偏移（CFO）估计模块和采样频率偏移（SFO）校正模块。 SFO校正模块接收估计的CFO，然后基于估计的CFO确定SFO校正，并将SFO校正应用于接收到的数据流。

公开(公告)号：US20060223472A1

公开(公告)日：2006-10-05

申请号：US11392868

申请日：2006-03-30

申请人： Amit Bagchi ,  Rohit Gaikwad

发明人： Amit Bagchi ,  Rohit Gaikwad

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H03F1/26 ,  H03D3/008 ,  H03F1/34 ,  H03F3/24 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/294 ,  H03F2200/372 ,  H04B1/30

摘要： The present invention relates to a DC offset canceling circuit. In one aspect of the invention, a DC offset canceling circuit with independently configurable gain and roll-off frequency is provided. In one embodiment of the present invention, the DC offset canceling circuit is used in the receive path of a down-conversion wireless receiver. In another aspect of the invention, a method for independently varying the gain and the roll-off frequency of the DC offset canceling circuit is provided. In one embodiment, the method is used to independently operate a gain control scheme and a DC offset cancellation strategy in a DC canceling circuit.

摘要翻译： 本发明涉及一种DC偏移抵消电路。 在本发明的一个方面，提供了具有独立可配置的增益和滚降频率的DC偏移消除电路。 在本发明的一个实施例中，DC偏移消除电路用于下变频无线接收机的接收路径。 在本发明的另一方面，提供一种用于独立地改变DC偏移消除电路的增益和滚降频率的方法。 在一个实施例中，该方法用于独立地操作DC消除电路中的增益控制方案和DC偏移消除策略。

公开(公告)号：US20060198477A1

公开(公告)日：2006-09-07

申请号：US11132939

申请日：2005-05-19

申请人： R. Moorti ,  Rohit Gaikwad ,  Amit Bagchi

发明人： R. Moorti ,  Rohit Gaikwad ,  Amit Bagchi

IPC分类号： H04B7/10 ,  H04B7/02 ,  H04L27/04

CPC分类号： H04L1/0631 ,  H04B7/10 ,  H04L1/0059 ,  H04L27/00

摘要： The present invention provides a method for carrier detection associated with the receipt of MIMO RF packet communications. This involves receiving multiple MIMO RF packet communications with multiple receiver pathways, wherein the RF packet communications each comprise a preamble and data. The RF packet communications are sampled by a carrier detector before, during or after conversion to baseband. The carrier detectors are used to produce a set of carrier detection metrics for each reception pathway. These carrier detection metrics may be combined arithmetically with those of other reception pathways to produce a multi-reception pathway carrier detect. Alternatively, these carrier detection metrics can be processed to produce a logical decision or binary detection signal value associated with each reception pathway, which is then logically combined with the logical decisions of other reception pathways to produce a multi-reception pathway carrier detect.

摘要翻译： 本发明提供了一种与接收MIMO RF分组通信相关联的载波检测方法。 这包括接收与多个接收机路径的多个MIMO RF分组通信，其中RF分组通信各自包括前导码和数据。 在转换到基带之前，期间或之后，载波检测器对RF分组通信进行采样。 载波检测器用于为每个接收路径产生一组载波检测度量。 这些载波检测度量可以与其他接收路径的载波检测度量进行算术计算，以产生多接收路径载波检测。 或者，可以处理这些载波检测度量以产生与每个接收路径相关联的逻辑判决或二进制检测信号值，然后逻辑判定或二进制检测信号值与其他接收路径的逻辑决策逻辑组合以产生多接收路径载波检测。

公开(公告)号：US07917114B2

公开(公告)日：2011-03-29

申请号：US11392868

申请日：2006-03-30

申请人： Amit Bagchi ,  Rohit Gaikwad

发明人： Amit Bagchi ,  Rohit Gaikwad

IPC分类号： H04B1/06 ,  H04B7/00 ,  H04B1/28

CPC分类号： H03F1/26 ,  H03D3/008 ,  H03F1/34 ,  H03F3/24 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/294 ,  H03F2200/372 ,  H04B1/30

摘要： The present invention relates to a DC offset canceling circuit. In one aspect of the invention, a DC offset canceling circuit with independently configurable gain and roll-off frequency is provided. In one embodiment of the present invention, the DC offset canceling circuit is used in the receive path of a down-conversion wireless receiver. In another aspect of the invention, a method for independently varying the gain and the roll-off frequency of the DC offset canceling circuit is provided. In one embodiment, the method is used to independently operate a gain control scheme and a DC offset cancellation strategy in a DC canceling circuit.

摘要翻译： 本发明涉及一种DC偏移抵消电路。 在本发明的一个方面，提供了具有独立可配置的增益和滚降频率的DC偏移消除电路。 在本发明的一个实施例中，DC偏移消除电路用于下变频无线接收机的接收路径。 在本发明的另一方面，提供一种用于独立地改变DC偏移消除电路的增益和滚降频率的方法。 在一个实施例中，该方法用于独立地操作DC消除电路中的增益控制方案和DC偏移消除策略。