公开(公告)号：US06778615B1

公开(公告)日：2004-08-17

申请号：US09580751

申请日：2000-05-30

申请人： Wim Sweldens

发明人： Wim Sweldens

IPC分类号： H03D100

CPC分类号： H04L1/0054

摘要： Received symbols are decoded in a communication system using a maximum likelihood block noncoherent decoding algorithm. The noncoherent decoding algorithm utilizes a set of test words determined for a given block of symbols based on a corresponding set of crossover angles which specify transitions between the test words. Advantageously, the decoding algorithm provides exact maximum likelihood block decoding having a complexity which is independent of the data rate of the symbols and linear-logarithmic in the block length.

摘要翻译： 接收的符号在使用最大似然块非相干解码算法的通信系统中进行解码。 非相干解码算法使用基于指定测试词之间的转换的相应的交叉角集合为给定的符号块确定的一组测试字。 有利地，解码算法提供精确的最大似然块解码，其具有独立于符号的数据速率和块长度中的线性对数的复杂度。

公开(公告)号：US06768373B2

公开(公告)日：2004-07-27

申请号：US10680384

申请日：2003-10-06

申请人： Mario Kupnik ,  Gebhard Melcher ,  Tobias Schlager ,  Walter Kargl ,  Ernst Neuhold

发明人： Mario Kupnik ,  Gebhard Melcher ,  Tobias Schlager ,  Walter Kargl ,  Ernst Neuhold

IPC分类号： H03D100

CPC分类号： H04L27/06

摘要： The invention provides a circuit configuration for demodulating a voltage that is ASK modulated by altering the amplitude between a low level and a high level. In this case, a first and a second charging circuit each produce a charging voltage and decoupling device decouples the first charging circuit when there is a prescribed ratio between the charging voltage of the second charging circuit and an input voltage for the rectifier circuit.

摘要翻译： 本发明提供一种电路配置，用于通过改变低电平和高电平之间的幅度来解调通过ASK调制的电压。 在这种情况下，当第二充电电路的充电电压与整流电路的输入电压之间存在规定的比例时，第一充电电路和第二充电电路各自产生充电电压，去耦装置使第一充电电路解耦。

公开(公告)号：US06757343B1

公开(公告)日：2004-06-29

申请号：US09596242

申请日：2000-06-16

申请人： Antonio Ortega ,  Wenqing Jiang

发明人： Antonio Ortega ,  Wenqing Jiang

IPC分类号： H03D100

CPC分类号： G06F17/148

摘要： Techniques to overlap states for efficient multilevel wavelet decompositions to reduce memory and delay in discrete wavelet transform in a block-by-block fashion. The input data is segmented into blocks and each block is processed separately, either sequentially or in parallel. Results of partially completed computations in each block is saved and used to complete computations in an adjacent block.

摘要翻译： 重叠状态的技术用于有效的多电平小波分解，以逐块方式减少离散小波变换中的存储和延迟。 输入数据被分段为块，每个块按顺序或并行处理。 保存每个块中部分完成计算的结果，并用于完成相邻块中的计算。

公开(公告)号：US06711218B2

公开(公告)日：2004-03-23

申请号：US09731165

申请日：2000-12-06

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H03D100

CPC分类号： H04L27/362 ,  H04L1/0054 ,  H04L25/0226 ,  H04L25/03197 ,  H04L25/03292 ,  H04L27/0008 ,  H04L27/2017 ,  H04L27/3488

摘要： A system and method for sequence estimation decoding allows a receiver to decode a received signal modulated according to one of plurality of possible modulating methods. In a preferred approach, a sequence estimation decoder detects the modulating method that was applied to the received signal, and adjusts its decoding process accordingly. In this manner, the decoder adjusts its operations to the specific one of the plurality of possible modulating methods used by the transmitting system originating the received signal. In an exemplary application, signals are modulated using either Gaussian Minimum Shift Keying (GMSK) or Offset Quadrature Amplitude Modulation (Offset-QAM), and the decoder adjusts its operations to either one of these modulating methods based on its detection of the particular method used.

摘要翻译： 用于序列估计解码的系统和方法允许接收机对根据多种可能调制方法之一调制的接收信号进行解码。 在优选方法中，序列估计解码器检测应用于接收信号的调制方法，并相应地调整其解码处理。 以这种方式，解码器将其操作调整为由发送接收信号的发送系统使用的多种可能的调制方式中的特定一种。 在示例性应用中，使用高斯最小偏移键控（GMSK）或偏移正交幅度调制（Offset-QAM）来调制信号，并且解码器基于其对所使用的特定方法的检测将其操作调整为这些调制方法中的任一种 。

公开(公告)号：US06704376B2

公开(公告)日：2004-03-09

申请号：US10208409

申请日：2002-07-29

申请人： Diane G. Mills ,  Rachel E. Learned

发明人： Diane G. Mills ,  Rachel E. Learned

IPC分类号： H03D100

CPC分类号： H04L25/067 ,  H03M13/2957 ,  H04B1/7105 ,  H04J13/0077 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071 ,  H04L25/0204 ,  H04L25/03171 ,  H04L25/03203 ,  H04L25/03216 ,  H04L25/03286 ,  H04L25/03331 ,  H04L2025/03611

摘要： A real-time multi-user detection (MUD) receiver processing simultaneous digitally modulated interferers and transmissions in the same frequency optimizing performance for heavily loaded and overloaded multiple access systems by implementing an iterative TurboMUD receiver using tree-pruning, including confidence ordering, power-ordering, and a voting procedure. On the first iteration, user indices are ordered according to received powers. On subsequent iterations, the voting system provides soft decisions or confidence values utilized as soft inputs to single-user decoders. Voting is computationally attractive and allows the bank of decoders to operate on soft values, improving performance and reducing the number of turboMUD iterations. The bank of soft output error correction decoders produces an improved set of soft decisions or confidence values corresponding to the channel bits transmitted by each interfering user. Confidence values from the bank of decoders are used to order user indices, allowing the tree pruned MUD detector to operate on the most reliable symbols first, improving the likelihood that pruning is correct. Subsequent confidence ordering and estimate refinement occurs until conditions are satisfied and iterative processing completed.

摘要翻译： 实时多用户检测（MUD）接收机通过使用树修剪（包括置信排序，功率调整）实现迭代TurboMUD接收机，处理同时数字调制的干扰信号和相同频率的传输，为重负载和过载的多址系统提供优化性能， 订购和投票程序。 在第一次迭代中，用户索引根据接收的功率进行排序。 在随后的迭代中，投票系统提供用作单用户解码器的软输入的软判决或置信度值。 投票在计算上是有吸引力的，并且允许解码器组以软值操作，提高性能并减少turboMUD迭代的数量。 软输出纠错解码器组产生对应于每个干扰用户发送的信道位的改进的一组软判决或置信度值。 来自解码器组的置信度值用于对用户索引进行排序，从而允许树剪枝MUD检测器首先对最可靠的符号进行操作，从而提高修剪正确的可能性。 随后的置信排序和估计细化发生，直到满足条件并且迭代处理完成为止。

公开(公告)号：US06700923B1

公开(公告)日：2004-03-02

申请号：US09474653

申请日：1999-12-29

申请人： Eric M. Dowling ,  Umesh G. Jani ,  Zifei Wang ,  Richard M. Golden

发明人： Eric M. Dowling ,  Umesh G. Jani ,  Zifei Wang ,  Richard M. Golden

IPC分类号： H03D100

CPC分类号： H04B1/7105

摘要： An apparatus and method for spread spectrum multiuser communication receivers is disclosed that includes, an adaptive filter adapted to minimize a block error function, wherein the filter tap weights are updated according to a non-linear optimization algorithm adapted for block processing of time-varying data.

摘要翻译： 公开了一种用于扩展频谱多用户通信接收机的装置和方法，其包括适于最小化块误差函数的自适应滤波器，其中根据适合于对时变数据进行块处理的非线性优化算法来更新滤波器抽头权重 。

公开(公告)号：US06696866B2

公开(公告)日：2004-02-24

申请号：US10201845

申请日：2002-07-24

申请人： James E. Mitzlaff

发明人： James E. Mitzlaff

IPC分类号： H03D100

CPC分类号： H03F1/025

摘要： An envelope tracking amplification system that includes an envelope tracking power supply (ETPS) amplifies a radio frequency (RF) signal to produce a linearized amplified signal. The envelope tracking amplification system samples the RF signal to produce a sampled RF signal. The ETPS produces a control signal based on an instantaneous magnitude of the sampled RF signal and further based on an average magnitude of the sampled RF signal, produces multiple supply voltages, and, based on the control signal, couples a supply voltage of the multiple supply voltages to an output of the EPTS to produce an output supply voltage. The envelope tracking amplification system then amplifies the RF signal based on the output supply voltage to produce a highly linear amplified signal.

摘要翻译： 包括跟踪电源（ETPS）的包络跟踪放大系统放大射频（RF）信号以产生线性放大信号。 包络跟踪放大系统对RF信号进行采样以产生采样的RF信号。 ETPS基于采样的RF信号的瞬时幅度产生控制信号，并且还基于采样的RF信号的平均幅度产生多个电源电压，并且基于控制信号，耦合多个电源的电源电压 电压到EPTS的输出以产生输出电源电压。 包络跟踪放大系统然后基于输出电源电压放大RF信号，以产生高度线性的放大信号。

公开(公告)号：US06661853B1

公开(公告)日：2003-12-09

申请号：US09524309

申请日：2000-03-14

申请人： Gregory Agami ,  Ron Rotstein ,  Robert J. Corke

发明人： Gregory Agami ,  Ron Rotstein ,  Robert J. Corke

IPC分类号： H03D100

CPC分类号： H04B7/0857 ,  H04B7/022 ,  H04L1/0054

摘要： A method and apparatus for maximal-ratio combining of received frame data is provided. This technique increases the reliability of a communication network that includes multiple independent receivers. For example, when multiple independent receivers are not in agreement as to the received frame data (501, 502, 503), an embodiment of the invention provides a higher likelihood of correctly identifying the received frame data (501, 502, 503). A technique for determining a signal-to-noise ratio from a metric signal (504) derived from a decoder (701) in a receiver is provided. The signal-to-noise ratio may be characterized according to a polynomial estimate or stored in lookup table. The signal-to-noise ratio is used to apply a weighting (805) to “hard decision” data from the receiver to yield a weighted value (806). The weighted value is combined with weighted values from other receivers. The combined weighted values are applied to a data slicer (414) to yield received data (807).

摘要翻译： 提供了一种用于接收帧数据的最大比组合的方法和装置。 这种技术增加了包括多个独立接收机的通信网络的可靠性。 例如，当多个独立的接收机对于接收到的帧数据（501,502,503）不一致时，本发明的一个实施例提供了更好地正确地识别接收的帧数据（501,502,503）的可能性。 提供了一种用于从接收机中的解码器（701）导出的度量信号（504）确定信噪比的技术。 可以根据多项式估计来表征信噪比，或存储在查找表中。 信噪比用于将来自接收机的加权（805）应用于“硬判决”数据以产生加权值（806）。 加权值与其他接收机的加权值组合。 将组合的加权值应用于数据限幅器（414）以产生接收数据（807）。

公开(公告)号：US06603823B1

公开(公告)日：2003-08-05

申请号：US09438475

申请日：1999-11-12

申请人： Daniel Yellin ,  Doron Rainish ,  Rony Ashkenazi

发明人： Daniel Yellin ,  Doron Rainish ,  Rony Ashkenazi

IPC分类号： H03D100

CPC分类号： H04L1/20 ,  H04B2201/70701 ,  H04L25/0232

摘要： The present invention is a channel estimator based on the values of received data and on a priori probabilities only of received symbols. The channel estimator includes a symbol probability generator, a noise variance estimator and a channel tap estimator. The symbol probability generator generates a priori probabilities only of transmitted symbols found in the received signal(s). The noise variance estimator estimates at least one noise variance corrupting the received signal(s). The channel tap estimator generates channel estimates from the received signal(s), the a priori probabilities and the noise variance(s).

摘要翻译： 本发明是基于接收数据的值和仅接收符号的先验概率的信道估计器。 信道估计器包括符号概率发生器，噪声方差估计器和信道抽头估计器。 符号概率发生器仅生成在接收信号中发现的发送符号的先验概率。 噪声方差估计器估计至少一个噪声方差破坏接收到的信号。 信道抽头估计器从接收到的信号，先验概率和噪声方差生成信道估计。

公开(公告)号：US06594323B1

公开(公告)日：2003-07-15

申请号：US09411593

申请日：1999-10-04

申请人： Chung-Yen Ong

发明人： Chung-Yen Ong

IPC分类号： H03D100

CPC分类号： H04B1/707

摘要： The present invention provides a method and an apparatus for providing a multiple access isochronous network that is capable of accommodating isochronous and asynchronous traffic. In accordance with the present invention, a non-zero thresholding mechanism is utilized at the receivers of the receiver/transmitter pairs communicating over the network to determine whether a given sub-channel is idle, or whether the receive buffer of a receiver operating in the receive mode is to be updated with a binary 0 or a binary 1. Utilizing the non-zero thresholding mechanism allows for the possibility that nothing is being sent over a particular sub-channel during one or more symbol periods. Utilizing the non-zero thresholding mechanism enables asynchronous and isochronous transport to occur on an isochronous framework without the need for stuffing bits onto the channel. Signals received over a sub-channel are demodulated and correlated to generate correlation results. Each correlation result is compared to a non-zero threshold to determine whether sufficient energy exists on the channel to indicate that a bit decision should be made. If insufficient energy exists on the sub-channel to warrant performing a bit decision, then the channel is deemed to be idle and no bit decision is performed. If sufficient energy exists on the sub-channel to warrant performing a bit decision, then the channel is deemed not to be idle and a bit decision is performed.

摘要翻译： 本发明提供了一种用于提供能够适应等时和异步业务的多址同步网络的方法和装置。 根据本发明，在通过网络通信的接收机/发射机对的接收机处利用非零阈值机制来确定给定的子信道是空闲的，还是接收器中的接收缓冲器是否在 接收模式将用二进制0或二进制1进行更新。利用非零阈值机制允许在一个或多个符号周期期间通过特定子信道没有发送任何信息的可能性。 利用非零阈值机制使得异步和等时传输在同步框架上发生，而不需要将信息填充到信道上。 通过子信道接收的信号被解调和相关以产生相关结果。 将每个相关结果与非零阈值进行比较，以确定信道上是否存在足够的能量以指示应进行位决策。 如果子信道上存在足够的能量以保证执行位决定，那么该信道被认为是空闲的并且不执行比特决定。 如果在子信道上存在足够的能量来保证执行位决定，那么该信道被认为不是空闲的并且执行位决定。