公开(公告)号：US06418163B2

公开(公告)日：2002-07-09

申请号：US09514111

申请日：2000-02-28

Applicant: Edward G. Tidemann, Jr. ,  Yu-Chuan Lin

Inventor： Edward G. Tidemann, Jr. ,  Yu-Chuan Lin

IPC: H04B346

CPC classification number: H04L1/208 ,  H04L1/0046 ,  H04L25/0262

Abstract: A system and method for determining the data rate of a frame of data at a receiver of a variable rate communications system. A vocoder at a transmitter encodes a frame of data at one of the rates of a predetermined set of rates. The data rate is dependent on the speech activity during the time frame of the data. The data frame is also formatted with overhead bits, including bits for error detection and detection. At the receiver, the data rate for the frame is determined based on hypothesis testing. Because the data rate is based on speech activity, a hypothesis test may be designed based on the statistics of speech activity. The received data frame is first decoded into information bits at the most probable rate as provided by the hypothesis test. Error metrics are generated for the decoded information bits. If the error metrics indicate that the information bits are of good quality, then the information bits are presented to a vocoder at the receiver to be processed for interface with the user. If the error metrics indicate that the information bits have not been properly decoded, then the received data frame is decoded at the other rates of the set of rates until the actual data rate is determined.

Abstract translation: 一种用于在可变速率通信系统的接收机处确定数据帧的数据速率的系统和方法。 发射机的声码器以预定速率集合的速率之一编码数据帧。 数据速率取决于数据时间段内的语音活动。 数据帧也被格式化为开销位，包括用于错误检测和检测的位。 在接收端，帧的数据速率是基于假设检验确定的。 由于数据速率是基于语音活动的，所以可以基于语音活动的统计来设计假设检验。 接收到的数据帧首先按照假设检验提供的最可能速率解码成信息位。 为解码的信息位生成错误度量。 如果错误度量指示信息比特质量好，则信息比特被提供给接收者处的声码器以与用户进行接口。 如果错误度量指示信息比特未被正确地解码，则接收到的数据帧以该比特率的其他速率被解码，直到确定实际数据速率。

公开(公告)号：US06397358B1

公开(公告)日：2002-05-28

申请号：US09322812

申请日：1999-05-28

Applicant: Mark Burton ,  Stephen Truelove

Inventor： Mark Burton ,  Stephen Truelove

IPC: G06R1100

CPC classification number: H04L1/208 ,  H04L1/0054 ,  H04L1/0059 ,  H04L1/0061 ,  H04L1/007 ,  H04L1/20

Abstract: A method of improving frame erasure performance for slow frequency hopping channels utilizing two convolutional decoding steps and two PBER thresholds in conjunction with the cyclic redundancy check. The breakdown condition in the convolutional decoding process is detected by means of a ‘forward backward decoding’ algorithm. The breakdown condition is detected with two passes of the convolutional decoder. When the decoder breaks down an essentially random burst of erroneous decoded bits are produced, and due to the memory effect of the decoder these will be different in each decoding direction. These erroneous random errors may be detected by comparison of the two decoded sets of data.

Abstract translation: 一种利用两个卷积解码步骤和两个PBER阈值结合循环冗余校验改进慢跳频信道的帧擦除性能的方法。 通过“前向后向解码”算法检测卷积解码处理中的故障条件，通过卷积解码器的两遍检测击穿条件，当解码器发生故障时产生基本随机的错误解码比特串， 并且由于解码器的存储效应，这些在每个解码方向上将是不同的，这些错误的随机误差可以通过比较两个解码的数据集来检测。

公开(公告)号：US6163571A

公开(公告)日：2000-12-19

申请号：US65708

申请日：1998-04-24

Applicant: Ram Asokan ,  Kumar Balachandran

Inventor： Ram Asokan ,  Kumar Balachandran

IPC: H04B17/00 ,  H04L1/20 ,  H04B3/46

CPC classification number: H04L1/203 ,  H04L1/208

Abstract: A received signal processing circuit for a receiver in a digital communication system uses a re-encode and compare scheme to measure received signal quality. The received signal is demodulated and decoded to produce an estimate of the original information bit sequence. The estimate of the information bit sequence is re-encoded using the same channel code as the transmitter. The re-encoded bits are compared to the demodulated bits output from the demodulator to yield an initial estimate of the channel bit error rate caused by the communication channel. Bias in th4e initial estimate of the channel bit error rate is removed to produce a refined estimate of the channel bit error rate.

Abstract translation: 用于数字通信系统中的接收机的接收信号处理电路使用重新编码和比较方案来测量接收信号质量。 接收的信号被解调和解码以产生原始信息比特序列的估计。 使用与发射机相同的信道码重新编码信息比特序列的估计。 将重新编码的比特与从解调器输出的解调比特进行比较，以产生由通信信道引起的信道比特误码率的初始估计。 去除信道误码率的初始估计中的偏差，以产生信道误码率的精确估计。

公开(公告)号：US6157683A

公开(公告)日：2000-12-05

申请号：US18679

申请日：1998-02-04

Applicant: Dariush Daribi ,  Advait Mogre ,  Daniel Luthi

Inventor： Dariush Daribi ,  Advait Mogre ,  Daniel Luthi

IPC: H04L1/00 ,  H04L27/227 ,  H03D1/00 ,  H04L27/00

CPC classification number: H04L1/0068 ,  H04L1/0047 ,  H04L1/0054 ,  H04L1/208 ,  H04L27/2273

Abstract: A method and system for compensating for code invariancies in a digital communication receiver is performed on demodulated signal data. A pre-Viterbi invariancy compensation is performed on the demodulated signal data to reverse a selected one of a number of possible transformations to create compensated signal data. The compensated signal data is then depunctured. The depunctured data is then decoded. An encoder encodes the decoded data. The encoded data and the depunctured data are then compared to determine equivalence. The pre-Viterbi invariancy compensation is performed to reverse a different one of the number of possible transformations to create the compensated signal data when the encoded data and the depunctured data are determined not to be equivalent. A post-Viterbi invariancy compensation is then performed on the decoded data to produce a set of compensated outputs. Thus, the post-Viterbi invariancy compensation reverses each one of the number of possible transformations on the decoded data. An output is then selected from between the set of compensated outputs and the decoded data in response to detection of a sync byte.

Abstract translation: 在解调信号数据上执行用于补偿数字通信接收机中的代码不变性的方法和系统。 对解调的信号数据执行维特比之前的平均补偿，以反转多个可能变换中的所选择的一个，以产生补偿的信号数据。 补偿后的信号数据被解码。 解码后的数据被解码。 编码器对解码的数据进行编码。 然后比较编码数据和解穿孔数据以确定等效性。 当编码数据和解穿刺数据被确定为不相等时，执行前维特比平均补偿以逆转可能变换的数量中的不同的一个以产生补偿信号数据。 然后对解码的数据执行后维特比（Viterbi）的不动产补偿，以产生一组补偿输出。 因此，维特比后变形补偿反转解码数据上的可能转换次数中的每一个。 响应于同步字节的检测，然后从该组补偿输出和解码数据之间选择一个输出。

公开(公告)号：US5923666A

公开(公告)日：1999-07-13

申请号：US735868

申请日：1996-10-23

Applicant: Jeff Gledhill ,  Santosh Anikhindi

Inventor： Jeff Gledhill ,  Santosh Anikhindi

IPC: H04L1/00 ,  H04L27/26 ,  H04J1/00

CPC classification number: H04L27/2647 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/203 ,  H04L1/208

Abstract: This invention relates to decoding symbols in the form of modulated carriers which are encoded using orthogonal frequency divsion multiplexing. The modulated carriers are supplied to a decoder which is preferably a Viterbi decoder. The decoder symbols are then recoded and passed to a comparator where they are compared with the incoming modulated carriers to locate errors between each recoded symbol and the corresponding modulated carrier symbol. The error rate for each carrier is derived by a counter and the indications of error rate and the modulated carriers are used to address entries in a look up table from which a decoder decodes the symbols represented by the modulated carriers.

Abstract translation: 本发明涉及以正交频分复用进行编码的调制载波形式的码元解码。 调制的载波被提供给优选为维特比解码器的解码器。 然后，解码器符号被重新编码并传递给比较器，在比较器中它们与输入的调制载波进行比较，以便定位每个重新编码符号和对应的调制载波符号之间的误差。 每个载波的误码率由计数器导出，错误率和调制载波的指示用于寻址查询表中的条目，解码器从编码器解码由调制载波表示的符号。

公开(公告)号：US5729557A

公开(公告)日：1998-03-17

申请号：US542541

申请日：1995-10-12

Applicant: Steven H. Gardner ,  James E. Petranovich ,  C. Thomas Hardin

Inventor： Steven H. Gardner ,  James E. Petranovich ,  C. Thomas Hardin

IPC: H04B7/005 ,  H04B7/26 ,  H04L1/00 ,  H04L29/06 ,  H03M13/00 ,  H03M13/12

CPC classification number: H04W52/267 ,  H04B7/2659 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0025 ,  H04L1/0032 ,  H04L1/0046 ,  H04L1/0068 ,  H04L1/208 ,  H04L69/18

Abstract: A method and apparatus for using multiple code rates for forward error correction in a cellular digital data radio communication system. Each base station broadcasts a quantity called the power product (PP), which is equal to the base station transmit power, P.sub.BT, multiplied by the power level received at the base station, P.sub.BR. For a mobile unit to determine its appropriate transmit power, P.sub.MT, requires measuring the power received, P.sub.MR, at the mobile unit and performing the following calculation: P.sub.MT ==PP/P.sub.MR. When channel path loss is large, it is possible that the power control calculation will return a value greater than the maximum transmit power capability of the mobile unit. In such a case, the mobile unit selects a lower code rate. Base station receiver sensitivity improves as the code rate decreases, so the result is similar to increasing the transmitter power. In the preferred embodiment, the invention uses 3 different code rates. In most cases, the code rate used is rate 2/3, but when a mobile unit determines that it needs more transmit power than it is capable of providing, the code rate is changed to 1/2, and in severe cases the code rate is changed to 1/3. Other features are that mobile unit code rate selection can be based on the quantity of data to be transmitted, and a base station can determine the code rate used by a mobile unit by attempting to decode all code rates and choosing the best result.

Abstract translation: 一种在蜂窝数字无线电通信系统中使用多码率进行前向纠错的方法和装置。 每个基站广播称为功率产品（PP）的数量，其等于基站发射功率PBT乘以在基站接收的功率电平PBR。 要移动单元确定其适当的发射功率，PMT需要测量移动单元接收的功率PMR，并执行以下计算：PMT = PP / PMR。 当通道路径损耗大时，功率控制计算可能返回大于移动单元的最大发射功率能力的值。 在这种情况下，移动单元选择较低的码率。 基站接收机灵敏度随码率的降低而提高，结果与增加发射机功率相似。 在优选实施例中，本发明使用3种不同的代码率。 在大多数情况下，所使用的码率是速率2/3，但是当移动单元确定需要比能够提供的更多的发射功率时，码率被改变为1/2，并且在严重的情况下，码率 改为1/3。 其他特征是移动单元码率选择可以基于要发送的数据量，并且基站可以通过尝试解码所有码率并选择最佳结果来确定移动单元使用的码率。

公开(公告)号：US5671255A

公开(公告)日：1997-09-23

申请号：US624233

申请日：1996-03-29

Applicant: Michael Mao Wang ,  Fuyun Ling ,  Kenneth A. Stewart

Inventor： Michael Mao Wang ,  Fuyun Ling ,  Kenneth A. Stewart

IPC: H04J13/02 ,  H03M13/23 ,  H04B1/707 ,  H04L1/00 ,  H04L1/20 ,  H04L25/02 ,  H04Q7/38 ,  H04L27/06 ,  G06F11/10 ,  H04J3/22

CPC classification number: H04L1/208 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/20 ,  H04L25/0262 ,  H04B2201/70705

Abstract: A receiver (500) utilizes parameters generated by a Viterbi decoder (530) to determine one of a plurality of coding rates in which user information is transmitted. The receiver (500) combines the parameters in a predetermined manner, the result of which is a detection statistic (dij). By utilizing the detection statistic (dij), the coding rate at which user information is accurately determined.

Abstract translation: 接收机（500）利用由维特比解码器（530）产生的参数来确定发送用户信息的多个编码速率中的一个。 接收机（500）以预定的方式组合参数，其结果是检测统计量（dij）。 通过利用检测统计量（dij），准确地确定用户信息的编码率。

公开(公告)号：US11742998B2

公开(公告)日：2023-08-29

申请号：US17947622

申请日：2022-09-19

Applicant: Arista Networks, Inc.

Inventor： Utkarsha Verma ,  Victor Wen ,  Vamsi Anne

IPC: H04L1/00 ,  H04L1/1867 ,  H04L1/20 ,  H04L69/16

CPC classification number: H04L1/188 ,  H04L1/208 ,  H04L69/162

Abstract: A review and retry mechanism ensures a port channel can be configured to provide and maintain a minimum data speed. A timer-based review sequence reviews the constituent interfaces of a port channel to determine if a minimum speed requirement is met. If the minimum speed cannot be fulfilled, the port-channel member interfaces are un-programmed and removed from the port-channel, rendering the port-channel functionally inactive, thereby preventing network traffic loss. A timer-based retry sequence attempts to program the constituent interfaces. The minimum speed requirement of the interfaces is checked in the next review cycle. If the minimum speed requirement is met, then the review and retry mechanism halts and the port channel continues to remain active; otherwise, the interfaces are un-programmed and the process repeats.

公开(公告)号：US20170257786A1

公开(公告)日：2017-09-07

申请号：US15446934

申请日：2017-03-01

Applicant: QUALCOMM Incorporated

Inventor： Alecsander Eitan ,  Amichai Sanderovich ,  Elad Hadari

IPC: H04W24/10 ,  H04L5/00

CPC classification number: H04W24/10 ,  H04B17/11 ,  H04B17/14 ,  H04L1/0035 ,  H04L1/1671 ,  H04L1/208 ,  H04L5/0048 ,  H04L5/0057

Abstract: Systems and methods are provided for estimating non-linearity of a transmitter, a receiver or both based on measurements and/or feedback. The estimation of the non-linearity may be used at the transmitter, the receiver or both to tune one or more components to reduce non-linearity. In one aspect, a method for wireless communications comprises generating at least one training signal, and outputting the at least one training signal for transmission to a wireless node. The method also comprises receiving a feedback message from the wireless node, the feedback message providing feedback of the at least one training signal received at the wireless node. The method further comprises tuning at least one component based on the feedback message.

公开(公告)号：US20150222407A1

公开(公告)日：2015-08-06

申请号：US14422998

申请日：2012-08-24

Applicant: Sairamesh Nammi ,  Cagatay Konuskan ,  Namir Lidian

Inventor： Sairamesh Nammi ,  Cagatay Konuskan ,  Namir Lidian

IPC: H04L5/00 ,  H04B7/06 ,  H04B7/04

CPC classification number: H04L25/03929 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0697 ,  H04L1/1829 ,  H04L1/208 ,  H04L5/0055

Abstract: A method of operating a terminal in a radio access network may include receiving a transmission of first and second data blocks over respective first and second multiple-input-multiple-output (MIMO) layers during a transmission time interval (TTI). Respective first and second demodulated codewords may be generated corresponding to the transmission of the first and second data blocks, and the first and second demodulated codewords may be decoded. Responsive to failure decoding the first demodulated codeword and success decoding the second demodulated codeword, a negative acknowledgement may be transmitted indicating failure receiving the first and second data blocks. Related terminals are also discussed.

Abstract translation: 在无线电接入网络中操作终端的方法可以包括在传输时间间隔（TTI）期间在相应的第一和第二多输入多输出（MIMO）层上接收第一和第二数据块的传输。 可以对应于第一和第二数据块的传输来生成相应的第一和第二解调码字，并且可以对第一和第二解调码字进行解码。 响应于对第一解调码字进行故障解码并成功解码第二解调码字，可以发送指示接收第一和第二数据块的故障的否定确认。 还讨论了相关终端。