公开(公告)号：US20060153309A1

公开(公告)日：2006-07-13

申请号：US11035297

申请日：2005-01-12

申请人： Clive Tang ,  Victor Stolpman

发明人： Clive Tang ,  Victor Stolpman

IPC分类号： H04K1/10

CPC分类号： H04L27/2608

摘要： In one aspect thereof this invention provides a method to increase data throughput in an Orthogonal Frequency Division Multiplex (OFDM) wireless communications system. The method includes modeling data throughput as a function of received Signal to Noise Ratio (SNR) with a sigmoid function to produce a throughput curve characterized as having a lower knee region and an upper knee region; and performing a gradient ascent search along the throughput curve by varying the power of a plurality of sub-carriers so as to remove power from any sub-carrier having a received SNR to the left of the lower knee region, and to re-allocate the removed power to sub-carriers having a received SNR to the right of the lower knee region.

摘要翻译： 在其一方面，本发明提供了一种增加正交频分复用（OFDM）无线通信系统中的数据吞吐量的方法。 该方法包括以S形函数建模作为接收到的信噪比（SNR）的函数的数据吞吐量，以产生特征为具有较低膝盖区域和上膝部区域的吞吐量曲线; 以及通过改变多个子载波的功率沿着吞吐量曲线执行梯度上升搜索，以便从具有接收到的SNR的任何副载波的功率从下膝盖区域的左侧移除，并重新分配 将具有接收到的SNR的子载波的功率移除到下膝部区域的右侧。

公开(公告)号：US20050128935A1

公开(公告)日：2005-06-16

申请号：US10732066

申请日：2003-12-10

申请人： Clive Tang ,  Victor Stolpman

发明人： Clive Tang ,  Victor Stolpman

IPC分类号： H04J20060101 ,  H04J11/00 ,  H04L1/00 ,  H04L27/26

CPC分类号： H04L1/0009 ,  H04L1/0003 ,  H04L1/0021 ,  H04L27/2601

摘要： Disclosed is an OFDM communications system and a method of operating the OFDM communications system. The system includes an OFDM transmitter for transmitting data over a plurality of OFDM sub-channels, where the OFDM transmitter has a plurality of modulators of different types. The system further includes an OFDM receiver for receiving the data from the plurality of OFDM sub-channels, where the OFDM receiver has a plurality of corresponding demodulators of the different types. The system further includes, in accordance with this invention, an adaptive learning automata that contains a group or team of independent, decentralized automaton operating in accordance with a game theory-based approach. Each of the plurality of automaton are responsible for managing one MCS switching threshold value so as to maximize at least one selected performance criterion. The OFDM transmitter is responsive to the MCS switching thresholds for selecting an appropriate one or ones of said modulators for modulating the data for various ones of the sub-channels.

摘要翻译： 公开了OFDM通信系统和操作OFDM通信系统的方法。 该系统包括用于在多个OFDM子信道上发送数据的OFDM发射机，其中OFDM发射机具有多个不同类型的调制器。 该系统还包括用于从多个OFDM子信道接收数据的OFDM接收机，其中OFDM接收机具有多个不同类型的对应解调器。 该系统还包括根据本发明的自适应学习自动机，其包含根据基于游戏理论的方法操作的独立的分散式自动机的组或团队。 多个自动机中的每一个负责管理一个MCS切换阈值，以使至少一个所选择的性能标准最大化。 OFDM发射机响应于MCS切换阈值，用于选择用于调制各个子信道的数据的所述调制器中适当的一个或多个调制器。

公开(公告)号：US20050157670A1

公开(公告)日：2005-07-21

申请号：US10760033

申请日：2004-01-16

申请人： Clive Tang ,  Victor Stolpman

发明人： Clive Tang ,  Victor Stolpman

IPC分类号： H04B7/216 ,  H04B7/26 ,  H04L1/00 ,  H04L5/02 ,  H04L27/26

CPC分类号： H04L1/0021 ,  H04B7/2628 ,  H04L1/0003 ,  H04L5/0007 ,  H04L5/0021 ,  H04L5/0028 ,  H04L5/0039 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L5/0094 ,  H04L27/0008

摘要： In a multi-user frequency domain spreading downlink MC-CDMA system. a group of sub-carriers can be replaced by an equivalent sub-carrier of a conventional OFDM modem for purposes of resource allocation to improve the system performance. The chips for a given user are spread only within the group. Confinement insures synchronization between different users' chips that is essential to the recovering and separation of user symbols at the receiver. There is no limit imposed on the group size, which permits different spreading code lengths to be used for different scenarios or for performance tuning.

摘要翻译： 在多用户频域扩频下行MC-CDMA系统中。 为了提高系统性能，可以用传统OFDM调制解调器的等效子载波来代替一组子载波来进行资源分配。 给定用户的芯片仅在组内传播。 限制确保不同用户的芯片之间的同步，这对于在接收器处恢复和分离用户符号至关重要。 对组大小没有限制，这允许不同扩展码长度用于不同场景或性能调整。

公开(公告)号：US20050025040A1

公开(公告)日：2005-02-03

申请号：US10629124

申请日：2003-07-29

申请人： Clive Tang ,  Victor Stolpman

发明人： Clive Tang ,  Victor Stolpman

IPC分类号： H04L27/26 ,  H04J11/00 ,  H04J1/00

CPC分类号： H04L27/2608

摘要： Disclosed is a method to operate an orthogonal frequency duplex multiplexing (OFDM) communications system, and an OFDM system that operates in accordance with the method. The method includes, when transmitting data over a plurality of OFDM sub-channels from an OFDM transmitter (12A) to an OFDM receiver (12B) through a channel (24), operating an adaptive learning automaton (50) to adjust values of modulation coding scheme (MCS) switching thresholds so as to maximize at least one selected performance criterion; based on the values of the switching thresholds, selecting a MCS and modulating data with the selected MCS and transmitting the modulated data over at least some of the sub-channels. The method further includes receiving the data at the OFDM receiver and demodulating the received data using a demodulator that corresponds to the selected MCS.

摘要翻译： 公开了一种操作正交频率双工多路复用（OFDM）通信系统的方法和根据该方法操作的OFDM系统。 该方法包括：通过多个OFDM子信道通过信道（24）从OFDM发射机（12A）向OFDM接收机（12B）发送数据时，操作自适应学习自动机（50）以调整调制编码的值 方案（MCS）切换阈值，以便使至少一个选择的性能标准最大化; 基于切换阈值的值，选择MCS并使用所选择的MCS调制数据，并通过至少一些子信道发送调制数据。 该方法还包括在OFDM接收器处接收数据并使用对应于所选择的MCS的解调器来解调所接收的数据。

公开(公告)号：US07221654B2

公开(公告)日：2007-05-22

申请号：US10008094

申请日：2001-11-13

申请人： Clive Tang

发明人： Clive Tang

IPC分类号： H04J3/14 ,  G06F15/18

CPC分类号： H04L1/0021 ,  H04L1/0003

摘要： Apparatus, and an associated method, for selecting operational parameters pursuant to which a radio communication system is operable. The operational parameters form, for instance, adaptive switching thresholds used in an adaptive modulation scheme. Separate learning controllers are configured to operate independently and cooperatively to select the adaptive switching thresholds, or other operational parameters. Iterative operation of the learning controllers causes the values to converge to optimal values.

摘要翻译： 用于选择无线电通信系统可操作的操作参数的装置和相关方法。 操作参数形成例如在自适应调制方案中使用的自适应切换阈值。 单独的学习控制器被配置为独立地和协作地操作以选择自适应切换阈值或其他操作参数。 学习控制器的迭代操作使得值收敛到最佳值。

公开(公告)号：US08204456B2

公开(公告)日：2012-06-19

申请号：US12882498

申请日：2010-09-15

申请人： Bing Xu ,  Clive Tang ,  Mahibur Rahman

发明人： Bing Xu ,  Clive Tang ,  Mahibur Rahman

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H03F3/24 ,  H04B2001/0425

摘要： In accordance with some embodiments of the present disclosure, a method may include digitally pre-distorting a digital baseband signal with an opposite phase of a C-IM3 distortion term such that the pre-distortion and C-IM3 distortion cancel each other out in a transmitter. The method may also include digitally conditioning the pre-distorted digital signal in order to provide a flat amplitude response of a composite filter comprising a baseband filter and a digital half-band filter of the transmitter, and to provide a linear phase response for the composite filter.

摘要翻译： 根据本公开的一些实施例，一种方法可以包括以C-IM3失真项的相反相数字预失真数字基带信号，使得预失真和C-IM3失真在一个 发射机。 该方法还可以包括对预失真的数字信号进行数字调节，以便提供包括发射机的基带滤波器和数字半带滤波器的复合滤波器的平坦振幅响应，并且为复合信号提供线性相位响应 过滤。

公开(公告)号：US20120064847A1

公开(公告)日：2012-03-15

申请号：US12882498

申请日：2010-09-15

申请人： Bing Xu ,  Clive Tang ,  Mahibur Rahman

发明人： Bing Xu ,  Clive Tang ,  Mahibur Rahman

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H03F3/24 ,  H04B2001/0425

摘要： In accordance with some embodiments of the present disclosure, a method may include digitally pre-distorting a digital baseband signal with an opposite phase of a C-IM3 distortion term such that the pre-distortion and C-IM3 distortion cancel each other out in a transmitter. The method may also include digitally conditioning the pre-distorted digital signal in order to provide a flat amplitude response of a composite filter comprising a baseband filter and a digital half-band filter of the transmitter, and to provide a linear phase response for the composite filter.

摘要翻译： 根据本公开的一些实施例，一种方法可以包括以C-IM3失真项的相反相数字预失真数字基带信号，使得预失真和C-IM3失真在一个 发射机。 该方法还可以包括对预失真的数字信号进行数字调节，以便提供包括发射机的基带滤波器和数字半带滤波器的复合滤波器的平坦振幅响应，并且为复合信号提供线性相位响应 过滤。

公开(公告)号：US07477702B2

公开(公告)日：2009-01-13

申请号：US09901988

申请日：2001-07-10

申请人： Clive Tang

发明人： Clive Tang

IPC分类号： H04K1/02

CPC分类号： H04L1/0021 ,  H04L1/0003 ,  H04L1/0015 ,  H04L1/0034

摘要： Apparatus, and an associated method selects an adaptive switching threshold level responsive to a constrained optimization scheme. The switching level is selected by an LRI function forming a portion of a transmitting station, such as a base transceiver station operable in a cellular communication system. The switching threshold level is utilized in the selection by an adaptive modulator of a modulation parameter by which data transmitted by the transmitting station is encoded or modulated.

公开(公告)号：US20090088098A1

公开(公告)日：2009-04-02

申请号：US11864519

申请日：2007-09-28

申请人： Bing Xu ,  Pravin Premakanthan ,  Clive Tang ,  Mahibur Rahman

发明人： Bing Xu ,  Pravin Premakanthan ,  Clive Tang ,  Mahibur Rahman

IPC分类号： H04B1/04

CPC分类号： H03G3/3047 ,  H04B2001/0416

摘要： Embodiments of wireless devices and transmitters are provided, which perform embodiments of automatic gain control methods. The embodiments of wireless devices and transmitters include a ramp generator, a digital gain signal generator, a combiner, and a variable gain amplifier. The ramp generator is adapted to receive a gain control input signal and to generate a gain ramp signal based on the gain control input signal. The digital gain signal generator is adapted to generate and incorporate a gain arc into a digital gain signal. A combiner is adapted to receive and combine a digital input signal with the digital gain signal, to generate a pre-compensated digital signal. The variable gain amplifier is adapted to apply gains indicated in the gain ramp signal to a pre-adjusted analog signal, which is generated based on the pre-compensated digital signal, in order to generate a gain-adjusted analog signal.

摘要翻译： 提供了无线设备和发射机的实施例，其执行自动增益控制方法的实施例。 无线设备和发射机的实施例包括斜坡发生器，数字增益信号发生器，组合器和可变增益放大器。 斜坡发生器适于接收增益控制输入信号并且基于增益控制输入信号产生增益斜坡信号。 数字增益信号发生器适于产生并将增益电弧并入数字增益信号中。 组合器适于接收和组合数字输入信号与数字增益信号，以产生预先补偿的数字信号。 可变增益放大器适于将增益斜坡信号中指示的增益应用于基于预补偿数字信号产生的预调节模拟信号，以便产生经增益调整的模拟信号。

公开(公告)号：US07805116B2

公开(公告)日：2010-09-28

申请号：US11864519

申请日：2007-09-28

申请人： Bing Xu ,  Pravin Premakanthan ,  Clive Tang ,  Mahibur Rahman

发明人： Bing Xu ,  Pravin Premakanthan ,  Clive Tang ,  Mahibur Rahman

IPC分类号： H01Q11/12 ,  H04B1/04

CPC分类号： H03G3/3047 ,  H04B2001/0416

摘要： Embodiments of wireless devices and transmitters are provided, which perform embodiments of automatic gain control methods. The embodiments of wireless devices and transmitters include a ramp generator, a digital gain signal generator, a combiner, and a variable gain amplifier. The ramp generator is adapted to receive a gain control input signal and to generate a gain ramp signal based on the gain control input signal. The digital gain signal generator is adapted to generate and incorporate a gain arc into a digital gain signal. A combiner is adapted to receive and combine a digital input signal with the digital gain signal, to generate a pre-compensated digital signal. The variable gain amplifier is adapted to apply gains indicated in the gain ramp signal to a pre-adjusted analog signal, which is generated based on the pre-compensated digital signal, in order to generate a gain-adjusted analog signal.

摘要翻译： 提供了无线设备和发射机的实施例，其执行自动增益控制方法的实施例。 无线设备和发射机的实施例包括斜坡发生器，数字增益信号发生器，组合器和可变增益放大器。 斜坡发生器适于接收增益控制输入信号并且基于增益控制输入信号产生增益斜坡信号。 数字增益信号发生器适于产生并将增益电弧并入数字增益信号中。 组合器适于接收和组合数字输入信号与数字增益信号，以产生预先补偿的数字信号。 可变增益放大器适于将增益斜坡信号中指示的增益应用于基于预补偿数字信号产生的预调节模拟信号，以便产生经增益调整的模拟信号。