公开(公告)号：US07454183B2

公开(公告)日：2008-11-18

申请号：US10810462

申请日：2004-03-26

Applicant: Rajendra Tushar Moorti ,  Min Chuin Hoo

Inventor： Rajendra Tushar Moorti ,  Min Chuin Hoo

IPC: H04B7/00

CPC classification number: H01Q21/29 ,  H04B1/1027

Abstract: A method and system for antenna selection diversity with dynamic gain control. A receiver selects a starting antenna and dwells on it until an incoming signal is detected. An AGC is applied on the received signal and an estimate of the received power is determined for the starting antenna. The receiver may dwell on other antennas if the signal in the first antenna is not strong enough for signal processing. The gain of an antenna may be set by the gain and power levels of the previously dwelled-on antennas and/or by a power coupling factor that exists between the antennas in an antenna switch. The receiver switches through the remaining antennas as long as necessary to select at least one of the antennas for signal processing. Dynamically adjusting the gain of antennas in a diversity system provides a more accurate and efficient antenna selection scheme.

Abstract translation: 一种采用动态增益控制的天线选择分集方法和系统。 接收机选择起始天线并驻留在其上，直到检测到输入信号。 对接收的信号应用AGC，并且为起始天线确定接收功率的估计。 如果第一天线中的信号不足以用于信号处理，则接收机可以驻留在其他天线上。 天线的增益可以由先前驻留的天线的增益和功率电平和/或由天线开关中的天线之间存在的功率耦合因子来设定。 只要需要选择至少一个天线进行信号处理，接收机就切换剩余的天线。 在分集系统中动态地调整天线的增益提供了更精确和更有效的天线选择方案。

公开(公告)号：US20060146950A1

公开(公告)日：2006-07-06

申请号：US11027106

申请日：2004-12-31

Applicant: Min Chuin Hoo

Inventor： Min Chuin Hoo

IPC: H04L1/02

CPC classification number: H04B7/0669

Abstract: A reduced-complexity maximum-likelihood detector that provides a high degree of signal detection accuracy while maintaining high processing speeds. A communication system implementing the present invention comprises a plurality of transmit sources operable to transmit a plurality of symbols over a plurality of channels, wherein the detector is operable to receive symbols corresponding to the transmitted symbols. The detector processes the received symbols to obtain initial estimates of the transmitted symbols and then uses the initial estimates to generate a plurality of reduced search sets. The reduced search sets are then used to generate decisions for detecting the transmitted symbols. In various embodiments of the invention, the decisions for detecting the symbols can be hard decisions or soft decisions. Furthermore, in various embodiments of the invention, the initial estimates can be obtained using a plurality of linear equalization techniques, including zero-forcing equalization, minimum-mean-squared-error equalization. The initial estimate can also be obtained by nulling and canceling techniques. In various embodiments of the invention, the data output corresponding to the transmitted symbols can be obtained using a log-likelihood probability ratio. The method and apparatus of the present invention can be applied to any communication system with multiple transmit streams.

Abstract translation: 降低复杂度的最大似然检测器，在保持高处理速度的同时提供高度的信号检测精度。 实现本发明的通信系统包括多个发射源，其可操作以在多个信道上发送多个符号，其中该检测器可操作以接收对应于所发送符号的符号。 检测器处理接收到的符号以获得发送符号的初始估计，然后使用初始估计来生成多个缩减搜索集合。 然后，缩小的搜索集合用于产生用于检测所发送的符号的决定。 在本发明的各种实施例中，用于检测符号的决定可以是硬判决或软判决。 此外，在本发明的各种实施例中，可以使用多种线性均衡技术来获得初始估计，包括强制均衡，最小均方误差均衡。 初始估计也可以通过归零和取消技术获得。 在本发明的各种实施例中，可以使用对数似然概率比来获得对应于所发送符号的数据输出。 本发明的方法和装置可以应用于具有多个发送流的任何通信系统。

公开(公告)号：US08428541B2

公开(公告)日：2013-04-23

申请号：US12725060

申请日：2010-03-16

Applicant: Rajendra Tushar Moorti ,  Min Chuin Hoo ,  Jason Alexander Trachewsky

Inventor： Rajendra Tushar Moorti ,  Min Chuin Hoo ,  Jason Alexander Trachewsky

IPC: H04B1/10

CPC classification number: H04B17/0042 ,  H01Q1/1257 ,  H04B1/1027 ,  H04B7/0805 ,  H04B17/309

Abstract: A method for choosing at least one signal path is disclosed and may include determining a power level characteristic for each of a plurality of signal paths. The determined power level characteristic for each of the plurality of signal paths may be modified. At least one of the plurality of signal paths may be selected for receiving a signal. The selecting may be based on at least one of the modified power level characteristics. The method may also include cycling through at least one of the signal paths. The power level characteristic for each of the plurality of signal paths may be biased. The power level characteristic for each of the plurality of signal paths may be increased by a fixed amount.

Abstract translation: 公开了用于选择至少一个信号路径的方法，并且可以包括确定多个信号路径中的每一个的功率电平特性。 可以修改多个信号路径中的每一个的所确定的功率电平特性。 可以选择多个信号路径中的至少一个用于接收信号。 该选择可以基于修改的功率电平特性中的至少一个。 该方法还可以包括循环通过至少一个信号路径。 可以偏置多个信号路径中的每一个的功率电平特性。 可以将多个信号路径中的每一个的功率电平特性增加固定量。

公开(公告)号：US08391387B2

公开(公告)日：2013-03-05

申请号：US13372703

申请日：2012-02-14

Applicant: Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

Inventor： Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

IPC: H04L27/28

CPC classification number: H04B7/0613 ,  H04L1/0059 ,  H04L1/0071 ,  H04L27/2608

Abstract: An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.

Abstract translation: 交织器的布置分配来自多个正交频分复用（OFDM）载波的子载波发送的子符号之间的输入符号的比特。 以一种方式分配输入比特以提供跨子载波的​​分离，并且跨OFDM载波的子符号的旋转在信号路径损伤的当前提供额外的鲁棒性。

公开(公告)号：US07643578B2

公开(公告)日：2010-01-05

申请号：US11364637

申请日：2006-02-28

Applicant: Min Chuin Hoo ,  Rajendra Tushar Moorti

Inventor： Min Chuin Hoo ,  Rajendra Tushar Moorti

IPC: H03D3/00

CPC classification number: H04L27/2657 ,  H04L1/0618 ,  H04L27/2679 ,  H04L27/2695

Abstract: Angle estimation for modulated signal. A novel compensation technique is presented by which angle estimation may be performed for a modulated signal. More specifically, the angle between a constellation corresponding to a received signal and a constellation corresponding to a received signal may be very efficiently estimated using any one of the possible embodiments corresponding to various aspects of the invention. After this angle has been estimated, the received signal or the expected constellation may be rotated (or de-rotated) to compensate for this angular difference. In doing so, better estimates of the information bits that are demodulated and decoded from the received signal may be made. This approach may be implemented and adapted to any of a wide variety of communication systems including, but not limited to, single-input-multiple-output (SISO), single-input-multiple-output (SIMO), multiple-input-single-output (MISO), multiple-input-multiple-output (MIMO), and even space-time block code (STBC) communication systems or other communication systems.

Abstract translation: 调制信号的角度估计。 提出了一种新颖的补偿技术，可以对调制信号进行角度估计。 更具体地，可以使用对应于本发明的各个方面的任何一个可能的实施例来非常有效地估计对应于接收信号的星座与对应于接收信号的星座之间的角度。 在估计该角度之后，接收信号或预期星座可以被旋转（或去旋转）以补偿该角度差。 在这样做时，可以对从接收信号进行解调和解码的信息比特的更好估计。 这种方法可以被实现和适用于各种通信系统中的任何一种，包括但不限于单输入多输出（SISO），单输入多输出（SIMO），多输入单 输出（MISO），多输入多输出（MIMO），甚至空时块码（STBC）通信系统或其他通信系统。

公开(公告)号：US07433432B2

公开(公告)日：2008-10-07

申请号：US11027102

申请日：2004-12-31

Applicant: Min Chuin Hoo

Inventor： Min Chuin Hoo

IPC: H04L1/02

CPC classification number: H04B7/0891 ,  H04B7/0413 ,  H04B7/0848 ,  H04L1/206 ,  H04L25/03216 ,  H04L2025/03426 ,  H04L2025/03535

Abstract: An adaptive, reduced-complexity soft-output maximum-likelihood detector that is operable to process data by adaptively selecting a processing scheme based on a determination of signal quality. The signal quality is derived as a function of the noise, the modulation format, the channel (the communication environment), the transmit signal power and the receive signal power. If the signal quality is low, the signal is processed using a maximum likelihood detector. If, however, the signal quality is high, a simpler sub-optimal detector is used. By estimating the signal quality and choosing an appropriate detection method, the present invention ensures accurate detection of incoming data signals in a MIMO communication system while maintaining the highest possible processing speed.

Abstract translation: 一种自适应，低复杂度的软输出最大似然检测器，其可操作以通过基于信号质量的确定自适应地选择处理方案来处理数据。 信号质量作为噪声，调制格式，信道（通信环境），发射信号功率和接收信号功率的函数导出。 如果信号质量低，则使用最大似然检测器处理信号。 然而，如果信号质量高，则使用更简单的次优检测器。 通过估计信号质量并选择适当的检测方法，本发明在保持尽可能高的处理速度的同时确保在MIMO通信系统中准确检测输入数据信号。

公开(公告)号：US20130142280A1

公开(公告)日：2013-06-06

申请号：US13754850

申请日：2013-01-30

Applicant: Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

Inventor： Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

IPC: H04B7/06

CPC classification number: H04B7/0613 ,  H04L1/0059 ,  H04L1/0071 ,  H04L27/2608

Abstract: An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.

Abstract translation: 交织器的布置分配来自多个正交频分复用（OFDM）载波的子载波发送的子符号之间的输入符号的比特。 以一种方式分配输入比特以提供跨子载波的​​分离，并且跨OFDM载波的子符号的旋转在信号路径损伤的当前提供额外的鲁棒性。

公开(公告)号：US20120140613A1

公开(公告)日：2012-06-07

申请号：US13372703

申请日：2012-02-14

Applicant: Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

Inventor： Carlos H. Aldana ,  Amit G. Bagchi ,  Min Chuin Hoo

IPC: H04J11/00 ,  H04B1/69 ,  H04W84/02

CPC classification number: H04B7/0613 ,  H04L1/0059 ,  H04L1/0071 ,  H04L27/2608

Abstract: An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.

Abstract translation: 交织器的布置分配来自多个正交频分复用（OFDM）载波的子载波发送的子符号之间的输入符号的比特。 以一种方式分配输入比特以提供跨子载波的​​分离，并且跨OFDM载波的子符号的旋转在信号路径损伤的当前提供额外的鲁棒性。

公开(公告)号：US07764741B2

公开(公告)日：2010-07-27

申请号：US11695795

申请日：2007-04-03

Applicant: Rajendra Tushar Moorti ,  Min Chuin Hoo ,  Jason A. Trachewsky

Inventor： Rajendra Tushar Moorti ,  Min Chuin Hoo ,  Jason A. Trachewsky

IPC: H04L27/06

CPC classification number: H04L25/067 ,  H04L27/0012

Abstract: A radio frequency receiver for discriminating a modulation type to decode a signal field of an encoded signal in a wireless communication system. The radio frequency (RF) receiver receives an encoded signal having a preamble training sequence associated with a frame, the preamble training sequence including the signal field. The radio frequency receive generates at least a first log-likelihood ratio (LLR) stream and a second LLR stream for each of a plurality of sub-symbols for a predetermined portion of the received encoded signal based upon an m-bit wide modulation reference, wherein m represents the bit width of the modulation reference. The first LLR stream and the second LLR stream each include a plurality of LLR values. The plurality of LLR values of the first LLR stream are summed to produce a first cumulative LLR, and the plurality of LLR values of the second LLR stream are summed to produce a second cumulative LLR. The first cumulative LLR is discriminated with the second cumulative LLR to produce a discriminated modulation type output. The receiver decodes the signal field based on the discriminated modulation type output.

Abstract translation: 一种射频接收机，用于鉴别在无线通信系统中对编码信号的信号场进行解码的调制类型。 射频（RF）接收机接收具有与帧相关联的前同步码训练序列的编码信号，前导码训练序列包括信号字段。 基于m位宽调制参考，无线电频率接收对于接收的编码信号的预定部分的多个子符号中的每一个产生至少第一对数似然比（LLR）流和第二LLR流， 其中m表示调制参考的位宽。 第一LLR流和第二LLR流各自包括多个LLR值。 将第一LLR流的多个LLR值相加以产生第一累积LLR，并且将第二LLR流的多个LLR值相加以产生第二累积LLR。 第一累积LLR用第二累积LLR进行鉴别，以产生鉴别调制类型的输出。 接收机根据鉴别出的调制类型输出对信号场进行解码。

公开(公告)号：US20090270060A1

公开(公告)日：2009-10-29

申请号：US12498003

申请日：2009-07-06

Applicant: Min Chuin Hoo ,  Rajendra Tushar Moorti

Inventor： Min Chuin Hoo ,  Rajendra Tushar Moorti

IPC: H04B1/06

CPC classification number: H04B7/0814 ,  H04B7/0608

Abstract: 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.

Abstract translation: 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。