公开(公告)号：US20060114857A1

公开(公告)日：2006-06-01

申请号：US11280989

申请日：2005-11-17

Applicant: Stash Czaja ,  Feng Qian

Inventor： Stash Czaja ,  Feng Qian

IPC: H04B7/216

CPC classification number: H04B7/2628 ,  H04L5/023

Abstract: A system for sending multimedia information from at least one base station to one or more mobile stations via at least one wireless communication link includes at least one multimedia source for generating the multimedia information. At least one processor is coupled to the multimedia source for generating a number of data streams derived from the multimedia information on a media control access (MAC) layer. At least one data channel modulator is coupled to the processor for mapping the data streams into a number of data packets on a forward packet data channel between the base station and the mobile station, using a physical layer signaling based on a code-division multiple access (CDMA) or orthogonal frequency division modulation (OFDM) technology.

公开(公告)号：USRE40824E1

公开(公告)日：2009-07-07

申请号：US10957522

申请日：2004-10-01

Applicant: Stash Czaja ,  Sakari Jorri ,  Iikka Niva

Inventor： Stash Czaja ,  Sakari Jorri ,  Iikka Niva

IPC: H04Q7/00 ,  H04B7/216

CPC classification number: H04W36/12 ,  H04W8/005 ,  H04W24/10 ,  H04W36/08 ,  H04W36/30 ,  H04W88/08

Abstract: A method and system for mobile assisted handoff between base stations using different carrier frequencies in a Code Division Multiple Access (CDMA) cellular system. In the method and apparatus, a mobile station performs handoff measurements on forward link transmissions of handoff candidate CDMA base stations, where the forward link transmissions are transmitted on a carrier frequency that differs from the forward link carrier frequency of the current base station. The handoff measurements are performed during selected transmission frames that define transmission periods on the reverse link by the mobile station. During the measurement time in the selected transmission frame, the mobile station does not receive (punctures) data sent to it on the forward link and does not transmit data on the reverse link.

公开(公告)号：US06538592B1

公开(公告)日：2003-03-25

申请号：US09962630

申请日：2001-09-24

Applicant: Hong Kui Yang ,  Stash Czaja

Inventor： Hong Kui Yang ,  Stash Czaja

IPC: H03M112

CPC classification number: H03M3/362 ,  H03M3/418

Abstract: Provided is an analog-to-digital converter that includes a first analog-to-digital conversion (ADC) stage connected to input a first analog signal and a second ADC stage connected to input a second analog signal produced by the first ADC stage. A tone detector enables the second ADC stage from a disabled state when a first condition indicating the presence of a high-level interference tone is satisfied and disables the second ADC stage from an enabled state when a second condition indicating the absence of a high-level interference tone is satisfied.

Abstract translation: 提供了一种模数转换器，其包括连接以输入第一模拟信号的第一模数转换（ADC）级和连接到输入由第一ADC级产生的第二模拟信号的第二ADC级。 当指示存在高电平干扰色调的第一条件被满足时，音调检测器使得第二ADC级从禁用状态起作用，并且当指示不存在高电平的第二状态时将第二ADC级从使能状态禁止 干扰音满足。

公开(公告)号：US5440597A

公开(公告)日：1995-08-08

申请号：US157376

申请日：1993-11-23

Applicant: Sunguoon Chung ,  Stash Czaja

Inventor： Sunguoon Chung ,  Stash Czaja

IPC: H04B1/7075 ,  H04B1/7077 ,  H04B1/69 ,  H04J13/02 ,  H04J13/04

CPC classification number: H04B1/70775 ,  H04B1/70755

Abstract: A double dwell, maximum likelihood, serial sliding acquisition system (10) employs two thresholds which are a function of maximum likelihood thresholds, and not predetermined optimal thresholds. The two thresholds have values that are signal dependent, and are obtained in real time from a correlation of a received PN signal and a locally generated PN sequence during the acquisition process. The acquisition system continuously monitors the reliability of the detected signal. As a result, the decision making process is continuously performed so as to terminate the acquisition process whenever the detected signal is determined to be reliable. The acquisition system employs a principle that an optimal threshold level, in the power domain, is 6 dB lower than that of the maximum likelihood signal. The acquisition system obtains the maximum signal power from a maximum likelihood detector portion to adaptively update a threshold estimate, and then uses the adaptive threshold estimate for monitoring the reliability of the detected signal. After the reliable signal is detected the search process continues for an additional interval of time which is a function of a false alarm probability. The limited interval for which the search process continues is preferably a fraction or multiple of the second, longer dwell time. This additional searching interval is referred to as a post-detection search interval. During the post-detection search interval, the acquisition system monitors the received signal samples and, when no additional signal is detected, the acquisition process is terminated.

Abstract translation: 双停留，最大似然度，串行滑动获取系统（10）采用两个阈值，它们是最大似然阈值的函数，而不是预定的最优阈值。 两个阈值具有取决于信号的值，并且在获取过程期间从接收的PN信号和本地产生的PN序列的相关性实时获得。 采集系统持续监控检测信号的可靠性。 结果，连续执行决策处理，以便每当检测到的信号被确定为可靠时终止获取过程。 采集系统采用在功率域中最佳阈值电平比最大似然信号低6dB的原理。 采集系统从最大似然检测器部分获得最大信号功率，以自适应地更新阈值估计，然后使用自适应阈值估计来监视检测信号的可靠性。 在检测到可靠信号之后，搜索过程继续进行另外的时间间隔，这是误报概率的函数。 搜索过程继续的有限间隔优选地是第二较长驻留时间的分数或倍数。 该附加搜索间隔被称为检测后检索间隔。 在检测后检索间隔期间，采集系统监视接收到的信号样本，并且当没有检测到附加信号时，采集过程终止。

公开(公告)号：US07529221B2

公开(公告)日：2009-05-05

申请号：US11280989

申请日：2005-11-17

Applicant: Stash Czaja ,  Feng Qian

Inventor： Stash Czaja ,  Feng Qian

IPC: H04B7/216

CPC classification number: H04B7/2628 ,  H04L5/023

Abstract: A system for sending multimedia information from at least one base station to one or more mobile stations via at least one wireless communication link includes at least one multimedia source for generating the multimedia information. At least one processor is coupled to the multimedia source for generating a number of data streams derived from the multimedia information on a media control access (MAC) layer. At least one data channel modulator is coupled to the processor for mapping the data streams into a number of data packets on a forward packet data channel between the base station and the mobile station, using a physical layer signaling based on a code-division multiple access (CDMA) or orthogonal frequency division modulation (OFDM) technology.

Abstract translation: 用于经由至少一个无线通信链路将多媒体信息从至少一个基站发送到一个或多个移动站的系统包括用于生成多媒体信息的至少一个多媒体源。 至少一个处理器被耦合到多媒体源以产生从媒体控制访问（MAC）层上的多媒体信息导出的多个数据流。 至少一个数据信道调制器被耦合到处理器，用于使用基于码分多址的物理层信令将数据流映射到基站和移动站之间的前向分组数据信道上的多个数据分组中 （CDMA）或正交频分调制（OFDM）技术。

公开(公告)号：US06356595B1

公开(公告)日：2002-03-12

申请号：US09095614

申请日：1998-06-10

Applicant: Stash Czaja ,  Sanguoon Chung ,  Xiaojun Li

Inventor： Stash Czaja ,  Sanguoon Chung ,  Xiaojun Li

IPC: H03D100

CPC classification number: H03M13/6502 ,  H03M13/41 ,  H03M13/4169 ,  H04L1/0054

Abstract: A decoding method for use in a communications system employing a communication channel in which a message is convolutionally encoded by a base station encoder and transmitted to a remote terminal during a time slot allocated to at least that remote terminal. The encoder is not completely reset immediately prior to the allocated time slot such the encoder state is unknown at the onset thereof. The decoding method includes assigning a most likelihood probability for an initial encoder state as being one of a number of predetermined encoder states; and, convolutionally decoding ensuing bits of the message based on the assumption of the initial encoder state as one of the predetermined states. The method affords low error rate decoding, and allows for improved power conservation by a mobile station, since the mobile station need not awaken significantly prior to its allocated time slot. Preferably, a Viterbi decoder is used to perform the convolutional decoding. The method has particular utility when used for decoding page messages indicative of call notifications in a paging channel of a code division multiple access (CDMA) wireless telecommunications system.

Abstract translation: 一种在采用通信信道的通信系统中使用的解码方法，其中消息由基站编码器卷积编码并在分配给至少该远程终端的时隙期间被发送到远程终端。 编码器在分配的时隙之前不会立即完全复位，因此编码器状态在其开始时是未知的。 解码方法包括将初始编码器状态的最可能概率分配为多个预定编码器状态之一; 并且基于作为预定状态之一的初始编码器状态的假设，对消息的后续位进行卷积解码。 该方法提供低错误率解码，并且允许移动台改进功率节省，因为移动台在其分配的时隙之前不需要明显唤醒。 优选地，维特比解码器用于执行卷积解码。 当用于解码指示码分多址（CDMA）无线电信系统的寻呼信道中的呼叫通知的寻呼消息时，该方法具有特别的用途。

公开(公告)号：US5796757A

公开(公告)日：1998-08-18

申请号：US529101

申请日：1995-09-15

Applicant: Stash Czaja

Inventor： Stash Czaja

IPC: H04B1/707 ,  H04L1/00 ,  H04L1/08 ,  H04L25/02 ,  H03M13/12

CPC classification number: H04L1/0057 ,  H04B1/707 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/08 ,  H04L1/208 ,  H04L25/0262 ,  H04B2201/70705

Abstract: A method in accordance with this invention includes the steps of (a) decoding a received signal and determining, for individual ones of n data rates, a value of a total cumulative metric associated with a most likely path through a decoder trellis; (b) comparing the value of the total cumulative metric to a plurality of total cumulative metric threshold values, individual ones of the plurality of total cumulative metric threshold values corresponding to an expected total cumulative metric for an individual one of the n data rates and being one of fixed or adaptively determined; and (c) identifying the received data rate based on the comparison. The step of determining a total cumulative metric includes the steps of (a) processing branch metrics to determine survivor metrics; (b) normalizing individual ones of the survivor metrics to form normalized survivor metrics; (c) accumulating the normalized survivor metrics to form cumulative metrics; (d) accumulating normalization values used to normalize each of the normalized survivor metrics; (e) at the end of decoding, outputting a cumulative metric that corresponds to a most likely path through the trellis; and (f) combining an accumulated normalization value with the outputted cumulative metric to form the total cumulative metric.

Abstract translation: 根据本发明的方法包括以下步骤：（a）对接收到的信号进行解码，并且针对n个数据速率中的各个数据速率确定与通过解码器格架的最可能的路径相关联的总累积度量的值; （b）将总累积度量的值与多个总累积度量阈值进行比较，所述多个总累积度量阈值中的各个总累积度量阈值对应于n个数据速率中的一个的预期总累积度量，并且为 一个固定或自适应确定; 和（c）基于比较来识别所接收的数据速率。 确定总累积度量的步骤包括以下步骤：（a）处理分支度量以确定幸存度量; （b）使个体幸存者度量标准化，以形成归一化幸存者指标; （c）积累归一化幸存者度量以形成累积度量; （d）累积用于归一化归一化幸存者度量标准化的归一化值; （e）在解码结束时，输出对应于通过网格的最可能路径的累积度量; 和（f）将累积归一化值与所输出的累积度量进行组合以形成总累积度量。

公开(公告)号：US5784392A

公开(公告)日：1998-07-21

申请号：US494917

申请日：1995-06-26

Applicant: Stash Czaja ,  Ilkka J. Niva ,  Jim Robertson

Inventor： Stash Czaja ,  Ilkka J. Niva ,  Jim Robertson

IPC: H03M13/29 ,  H03M13/41 ,  H03M13/45 ,  G06F11/10

CPC classification number: H03M13/4169 ,  H03M13/2933 ,  H03M13/4115 ,  H03M13/09

Abstract: This invention teaches a method, and circuits that operate in accordance with the method, for decoding data received from a communications channel. The method includes the steps of: (a) receiving a modulated communications signal that conveys block encoded data having at least a data field and a syndrome data field; and (b) determining transition metrics and path metrics for the block encoded data. The step of determining path metrics includes a step of retaining path metrics only for a Maximum-Likelihood (ML) path and for a second best ML path. The method further includes a step of: (c) decoding the block encoded data by performing either a full or a partial traceback operation for both the ML path metrics and also for the second best ML path metrics. In a full traceback there is obtained from the ML path a first plurality of detected bits representing the data field, a second plurality of detected bits from the ML path representing the syndrome data field, a third plurality of detected bits from the second best ML path representing the data field, and a fourth plurality of detected bits from the second best ML path representing the syndrome data field. A next step (d) determines a syndrome from the first plurality of detected bits, and then compares the determined syndrome to the second plurality of detected bits. Upon a match a next step (e) outputs the first plurality of detected bits as a received frame of data. If the step of comparing the determined syndrome to the second plurality of detected bits does not indicate a match, the method instead: (f) determines a syndrome from the third plurality of detected bits; (g) compares the determined syndrome to the fourth plurality of detected bits and, upon a match, (h) outputs the third plurality of detected bits as a received frame of data.

Abstract translation: 本发明教导了一种方法和根据该方法操作的电路，用于解码从通信信道接收的数据。 该方法包括以下步骤：（a）接收传送至少具有数据字段和校正子数据字段的块编码数据的调制通信信号; 和（b）确定块编码数据的转移度量和路径度量。 确定路径度量的步骤包括仅针对最大似然（ML）路径和第二最佳ML路径保留路径量度的步骤。 该方法还包括以下步骤：（c）通过对ML路径量度以及对于第二最佳ML路径度量执行完全或部分回溯操作来对块编码数据进行解码。 在完整回溯中，从ML路径获得表示数据字段的第一多个检测到的比特，来自表示校正子数据字段的ML路径的第二多个检测到的比特，来自第二最佳ML路径的第三多个检测比特 表示数据字段，以及来自表示所述校正子数据字段的来自所述第二最佳ML路径的第四多个检测到的比特。 下一步骤（d）从第一多个检测到的比特确定校正子，然后将确定的校正子与第二多个检测到的比特进行比较。 在匹配时，下一步骤（e）将第一多个检测到的比特输出为接收的数据帧。 如果将确定的校正子与第二多个检测到的比特进行比较的步骤不指示匹配，则该方法改为：（f）从第三多个检测到的比特中确定校正子; （g）将确定的校正子与第四多个检测到的比特进行比较，并且在匹配时，（h）将第三多个检测到的比特作为接收的数据帧输出。