公开(公告)号：US08290450B2

公开(公告)日：2012-10-16

申请号：US12939600

申请日：2010-11-04

申请人： Joachim Hammerschmidt ,  Rajendra Moorti

发明人： Joachim Hammerschmidt ,  Rajendra Moorti

IPC分类号： H04B1/04 ,  H04B17/00 ,  H03C1/62

CPC分类号： H04B17/21

摘要： Methods and systems for calibrating a transmitter with I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting a DC offset. The adjusting optionally includes an iterative refinement process.

摘要翻译： 用于校准具有I / Q不平衡和本地振荡器馈通的发射机的方法和系统包括产生测试音，上变频测试音，监测升高的测试音的一个或多个特征，以及调整一个或多个 变送器的功能响应监控。 该监视可选地包括监视向上转换的测试音的包络的跳动。 在一个实施例中，监视上转换的测试音的一次谐波用于本地振荡器馈通（LOFT）。 或者，对发射机的基带数据输入被禁用，并且通过测量发射机输出端的功率来测量LOFT。 监控上变频测试音的二次谐波，以获得增益和相位不平衡。 调整可选地包括调整增益不平衡，调整相位不平衡和/或调整DC偏移。 调整可选地包括迭代细化过程。

公开(公告)号：US20110051791A1

公开(公告)日：2011-03-03

申请号：US12939600

申请日：2010-11-04

申请人： Joachim HAMMERSCHMIDT ,  Rajendra Moorti

发明人： Joachim HAMMERSCHMIDT ,  Rajendra Moorti

IPC分类号： H04B17/00

CPC分类号： H04B17/21

摘要： Methods and systems for calibrating a transmitter with I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting a DC offset. The adjusting optionally includes an iterative refinement process.

摘要翻译： 用于校准具有I / Q不平衡和本地振荡器馈通的发射机的方法和系统包括产生测试音，上变频测试音，监测升高的测试音的一个或多个特征，以及调整一个或多个 变送器的功能响应监控。 该监视可选地包括监视向上转换的测试音的包络的跳动。 在一个实施例中，监视上转换的测试音的一次谐波用于本地振荡器馈通（LOFT）。 或者，对发射机的基带数据输入被禁用，并且通过测量发射机输出端的功率来测量LOFT。 监控上变频测试音的二次谐波，以获得增益和相位不平衡。 调整可选地包括调整增益不平衡，调整相位不平衡和/或调整DC偏移。 调整可选地包括迭代细化过程。

公开(公告)号：US20070025433A1

公开(公告)日：2007-02-01

申请号：US11396632

申请日：2006-04-04

申请人： Joachim Hammerschmidt ,  Rajendra Moorti

发明人： Joachim Hammerschmidt ,  Rajendra Moorti

IPC分类号： H04B17/00

CPC分类号： H04B17/21

摘要： Methods and systems to calibrating a transmitter for I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting DC offsets. The adjusting optionally includes an iterative refinement process. Such a refinement process optionally includes performing a first monitoring, applying a set of relatively coarse settings to the one or more features in the transmitter, monitoring the beating resulting from each of the coarse settings, selecting the coarse setting corresponding the smallest beating, applying a set of relatively fine settings centered around the selected coarse setting, wherein the fine settings are more closely related to one another than are the coarse settings, monitoring the beating resulting from each of the fine settings, and selecting the fine setting corresponding the smallest beating.

摘要翻译： 用于校准发射机以用于I / Q不平衡和本地振荡器馈通的方法和系统包括产生测试音，上变频测试音，监测升高的测试音的一个或多个特征，以及调整一个或多个 变送器的功能响应监控。 该监视可选地包括监视向上转换的测试音的包络的跳动。 在一个实施例中，监视上转换的测试音的一次谐波用于本地振荡器馈通（LOFT）。 或者，对发射机的基带数据输入被禁用，并且通过测量发射机输出端的功率来测量LOFT。 监控上变频测试音的二次谐波，以获得增益和相位不平衡。 该调整可选地包括调整增益不平衡，调整相位不平衡和/或调整DC偏移。 调整可选地包括迭代细化过程。 这样的细化处理可选地包括执行第一监视，将一组相对粗略的设置应用于发射机中的一个或多个特征，监视由每个粗略设置产生的跳动，选择对应于最小跳动的粗略设置，应用 以选择的粗略设置为中心的相对精细设置的集合，其中精细设置比粗略设置彼此更紧密地相关，监视由每个精细设置产生的打击，并且选择对应于最小跳动的精细设置。

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：US20050186921A1

公开(公告)日：2005-08-25

申请号：US10810433

申请日：2004-03-26

申请人： Min Hoo ,  Rajendra Moorti

发明人： Min Hoo ,  Rajendra Moorti

IPC分类号： H04B1/04 ,  H04B7/06 ,  H04B7/08

CPC分类号： H04B7/0814 ,  H04B7/0608

摘要： Certain embodiments of the invention may be found in a method and system for antenna selection diversity with prediction. An antenna diversity system may use information that it has stored on the antenna selection process in previous frames to predict the starting receiving antenna and the starting transmission antenna for the next frame. The prediction may be based on which antennas were selected in previous frames or may be based metrics associated with performance of the antennas. Prediction may be based on a majority polling scheme of previously selected antennas in a determined number of previous frames. Prediction may also be based on a weighted sum of at least one selection metric for all antennas in a determined number of previous frames. Antenna prediction provides a significant performance improvement by reducing the processing and operational overhead in cases where a transmit or a receive antenna dominates.

摘要翻译： 可以在用于具有预测的天线选择分集的方法和系统中找到本发明的某些实施例。 天线分集系统可以使用其在先前帧中的天线选择过程上存储的信息来预测起始接收天线和下一帧的起始发射天线。 预测可以基于在先前帧中选择哪些天线或者可以是与天线的性能相关联的基于度量的度量。 预测可以基于在确定数量的先前帧中的先前选择的天线的多数轮询方案。 预测还可以基于确定数量的先前帧中的所有天线的至少一个选择度量的加权和。 天线预测通过在发射或接收天线占主导地位的情况下减少处理和操作开销来提供显着的性能改进。

公开(公告)号：US20070110197A1

公开(公告)日：2007-05-17

申请号：US11542984

申请日：2006-10-04

申请人： Amit Bagchi ,  Rajendra Moorti

发明人： Amit Bagchi ,  Rajendra Moorti

IPC分类号： H04B1/10

CPC分类号： H04B1/406

摘要： A receiver includes digital logic for defining a plurality of signal paths for an ingoing digital signal to determine a frame classification. Frames are classified according to a combination of readings of a plurality of correlation block and relative signal (power) strengths. Power detection is specified for frequency bands of interest. The combination of readings and their corresponding pattern may be used to determine whether a frame is being transmitted in a lower bandwidth channel, an upper bandwidth channel or a large bandwidth channel that overlaps the lower and upper bandwidth channels. A transmission type (legacy, mixed mode, Greenfield) may subsequently be determined based upon the identity of the frame channel.

摘要翻译： 接收机包括用于定义用于输入数字信号的多个信号路径以确定帧分类的数字逻辑。 帧根据多个相关块的读数和相对信号（功率）强度的组合进行分类。 为感兴趣的频段指定功率检测。 读数和它们对应的模式的组合可用于确定帧是否在与较低和较高带宽信道重叠的较低带宽信道，较高带宽信道或大带宽信道中传输。 随后可以基于帧信道的身份来确定传输类型（传统的，混合模式，绿地）。

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：US20070004358A1

公开(公告)日：2007-01-04

申请号：US11284204

申请日：2005-11-21

申请人： Rajendra Moorti

发明人： Rajendra Moorti

IPC分类号： H04B17/00

CPC分类号： H03G3/3068 ,  H04B17/318

摘要： An integrated circuit radio transceiver and method therefor comprises a receiver front end that further includes a plurality of in-phase and quadrature phase receive processing block operable at first and second frequency bands wherein each of the receive processing blocks defines an ingoing signal path and further includes a plurality of filtering and amplification blocks disposed within the corresponding ingoing signal path, a plurality of RSSI blocks coupled to receive an ingoing analog signal from a corresponding plurality of nodes disposed throughout the ingoing signal path, each of the plurality of received signal strength indicator blocks producing a signal strength indication, and wherein a baseband processor is operable to receive a selected signal strength indication and to produce at least one gain setting to at least one amplification block within the in-phase or quadrature phase receive processing blocks. In operation, the baseband processor receive a signal strength indication from each RSSI block to determine a total amount of gain and appropriate gain distribution within the receive signal path.

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：US20070002878A1

公开(公告)日：2007-01-04

申请号：US11433997

申请日：2006-05-15

申请人： Rajendra Moorti ,  Jason Trachewsky ,  Joachim Hammerschmidt ,  Ling Su

发明人： Rajendra Moorti ,  Jason Trachewsky ,  Joachim Hammerschmidt ,  Ling Su

IPC分类号： H04L12/56 ,  H04J3/22

CPC分类号： H04L1/0068 ,  H04L1/0001 ,  H04L1/0041 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/0083

摘要： A multi-protocol wireless communication baseband transceiver includes a baseband transmit processing module and a baseband receive processing module. The baseband transmit processing module includes an encoding module, an interleaving module, a plurality of symbol mapping modules, a plurality of domain conversion modules, a plurality of cyclic prefix modules, a plurality of compensation modules, and a control module that is operably coupled to produce preamble set up information and payload set up information based on a mode of a plurality of protocol modes. The baseband receive processing module includes a plurality of receive compensation modules, a plurality of cyclic prefix removal modules, a plurality of receive domain conversion modules, an equalizing module, a plurality of demapping modules, a deinterleaving module, a decoding module, and a receive control module that is operably coupled to determine the mode from the plurality of protocol modes and the compensation control signals based on the at least one compensated stream of symbols.

摘要翻译： 多协议无线通信基带收发器包括基带发射处理模块和基带接收处理模块。 基带发送处理模块包括编码模块，交织模块，多个符号映射模块，多个域转换模块，多个循环前缀模块，多个补偿模块以及可操作地耦合到 基于多个协议模式的模式产生前导码建立信息和有效负载建立信息。 基带接收处理模块包括多个接收补偿模块，多个循环前缀去除模块，多个接收域转换模块，均衡模块，多个解映射模块，解交织模块，解码模块和接收器 控制模块，其可操作地耦合以基于所述至少一个经补偿的符号流来确定来自所述多个协议模式的模式和所述补偿控制信号。