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1. 发明授权

US09734848B1 Method and system for writing and reading closely-spaced data tracks 有权
公开(公告)号：US09734848B1
公开(公告)日：2017-08-15
申请号：US15232356
申请日：2016-08-09
申请人： Marvell International Ltd.
发明人： Nedeljko Varnica , Panu Chaichanavong , Gregory Burd
IPC分类号： G11B5/02 , G11B5/09 , G11B20/12 , G11B20/18 , G11B5/012 , G11B20/10 , G11B7/14
CPC分类号： G11B5/09 , G11B5/012 , G11B5/02 , G11B7/14 , G11B20/10305 , G11B20/10361 , G11B20/12 , G11B20/1217 , G11B20/1833 , G11B2020/1238 , G11B2020/1292
摘要： A method for writing data onto a medium on which data are stored in tracks includes encoding the data into at least one codeword, and writing a respective portion of each of the at least one codeword onto respective different tracks on the medium. The writing may include writing a respective portion of each of the at least one codeword onto respective different adjacent tracks on the medium. Another method for reading data includes positioning a plurality of read heads to read codewords that have been written across multiple tracks of a medium. Each read head in the plurality of read heads reads a different portion of the first group of the multiple tracks, and where each different portion of the multiple tracks overlaps at least one other different portion of the multiple tracks. Signals are detected from the plurality of read heads, and the detected signals are decoded.

2. 发明授权

US09490849B1 Systems and methods for configuring product codes for error correction in a hard disk drive 有权
公开(公告)号：US09490849B1
公开(公告)日：2016-11-08
申请号：US14961274
申请日：2015-12-07
申请人： Marvell International Ltd.
发明人： Nedeljko Varnica , Gregory Burd , Panu Chaichanavong
IPC分类号： H03M13/29 , G06F11/10 , H03M13/11 , H03M13/53
CPC分类号： H03M13/2909 , G06F11/1076 , H03M13/1102 , H03M13/1515 , H03M13/152 , H03M13/2957 , H03M13/2963 , H03M13/43 , H03M13/45 , H03M13/6325 , H04L1/0057
摘要： Systems and methods are provided for using a product code having a first dimension and a second dimension to encode data, decode data, or both. An encoding method includes receiving a portion of user data to be written in the first dimension, and computing first parity symbols with respect to the first dimension for the portion of user data. Partial parity symbols with respect to the second dimension are computed for the portion of user data and are used to obtain second parity symbols for the portion of user data. A decoding method includes decoding a first codeword in the first dimension. When the decoding the first codeword in the first dimension is successful, a target syndrome of a second codeword in the second dimension is computed based on a result of the decoding of the first codeword, wherein the first codeword partially overlaps with the second codeword.

3. 发明授权

US09419653B1 Systems and methods for combining constrained codes and error correcting codes 有权
标题翻译：用于组合约束码和纠错码的系统和方法
公开(公告)号：US09419653B1
公开(公告)日：2016-08-16
申请号：US13802490
申请日：2013-03-13
申请人： Marvell International Ltd.
发明人： Panu Chaichanavong
IPC分类号： H03M13/00 , H03M13/29
CPC分类号： H03M5/145 , H03M13/1102 , H03M13/118 , H03M13/2906 , H03M13/31
摘要： Methods and systems are provided for encoding and/or decoding data based on a constrained code and an error correction code (ECC). The data is encoded to generate combined LDPC-constrained codewords that may substantially satisfy both an ECC structure condition and a constrained code condition. A first plurality of sequences may be generated from input data to satisfy the constrained code condition. The first plurality of sequences may then be mapped to a second plurality of sequences that satisfies the ECC condition while preserving the constrained code condition.
摘要翻译：提供了用于基于约束码和纠错码（ECC）对数据进行编码和/或解码的方法和系统。数据被编码以产生可以基本上满足ECC结构条件和约束码条件的组合的LDPC约束码字。可以从输入数据生成第一多个序列以满足约束码条件。然后可以将第一多个序列映射到满足ECC条件的第二多个序列，同时保持约束码条件。

4. 发明授权

US09214964B1 Systems and methods for configuring product codes for error correction in a hard disk drive 有权
标题翻译：在硬盘驱动器中配置产品代码进行纠错的系统和方法
公开(公告)号：US09214964B1
公开(公告)日：2015-12-15
申请号：US14031622
申请日：2013-09-19
申请人： Marvell International Ltd.
发明人： Nedeljko Varnica , Gregory Burd , Panu Chaichanavong
IPC分类号： H03M13/29 , H03M13/53 , G06F11/10
CPC分类号： H03M13/2909 , G06F11/1076 , H03M13/1102 , H03M13/1515 , H03M13/152 , H03M13/2957 , H03M13/2963 , H03M13/43 , H03M13/45 , H03M13/6325 , H04L1/0057
摘要： Systems and methods are provided for using a product code having a first dimension and a second dimension to encode data, decode data, or both. An encoding method includes receiving a portion of user data to be written in the first dimension, and computing first parity symbols with respect to the first dimension for the portion of user data. Partial parity symbols with respect to the second dimension are computed for the portion of user data and are used to obtain second parity symbols for the portion of user data. A decoding method includes decoding a first codeword in the first dimension. When the decoding the first codeword in the first dimension is successful, a target syndrome of a second codeword in the second dimension is computed based on a result of the decoding of the first codeword, wherein the first codeword partially overlaps with the second codeword.
摘要翻译：提供了使用具有第一维度和第二维度的产品代码来对数据进行编码，解码数据或两者的系统和方法。一种编码方法包括接收要写入第一维度的用户数据的一部分，以及针对用户数据部分的第一维度计算第一奇偶校验符号。对于用户数据的部分计算相对于第二维度的部分奇偶校验符号，并且用于获得用户数据部分的第二奇偶校验符号。解码方法包括对第一维度中的第一码字进行解码。当解码第一维度中的第一码字成功时，基于第一码字的解码的结果来计算第二维度中的第二码字的目标综合征，其中第一码字与第二码字部分重叠。

5. 发明授权

US08976909B1 Nonlinear detectors for channels with signal-dependent noise 有权
标题翻译：具有信号噪声的通道的非线性检测器
公开(公告)号：US08976909B1
公开(公告)日：2015-03-10
申请号：US13901315
申请日：2013-05-23
申请人： Marvell International Ltd.
发明人： Hongxin Song , Seo-How Low , Panu Chaichanavong , Zining Wu
IPC分类号： H03H7/30 , H04B1/16
CPC分类号： H04B1/16 , H04L25/03197
摘要： A non-linear detector for detecting signals with signal-dependent noise is disclosed. The detector may choose a data sequence that maximizes the conditional probability of detecting the channel data. Since the channel may be time-varying and the precise channel characteristics may be unknown, the detector may adapt one or more branch metric parameters before sending the parameters to a loading block. In the loading block, the branch metric parameters may be normalized and part of the branch metric may be pre-computed to reduce the complexity of the detector. The loading block may then provide the branch metric parameters and any pre-computation to the detector. The detector may then calculate the branch metric associated with the input signal and output the channel data.
摘要翻译：公开了一种用于检测具有信号相关噪声的信号的非线性检测器。检测器可以选择使检测通道数据的条件概率最大化的数据序列。由于信道可能是时变的并且精确的信道特性可能是未知的，所以在将参数发送到加载块之前，检测器可以调整一个或多个分支度量参数。在加载块中，分支度量参数可以被归一化，并且可以预先计算分支度量的一部分以降低检测器的复杂度。然后，加载块可以向检测器提供分支度量参数和任何预计算。然后，检测器可以计算与输入信号相关联的分支量度并输出通道数据。

6. 发明授权

US08935600B1 Modification of decoder operating mode based on a probability of non-standard errors in concatenated decoding systems 有权
标题翻译：基于级联解码系统中非标准误差的概率，对解码器工作模式进行修改
公开(公告)号：US08935600B1
公开(公告)日：2015-01-13
申请号：US13628420
申请日：2012-09-27
申请人： Marvell International Ltd.
发明人： Nedeljko Varnica , Panu Chaichanavong , Heng Tang , Gregory Burd
IPC分类号： H03M13/03 , H03M13/00
CPC分类号： H03M13/6591 , H03M13/1111 , H03M13/2957 , H03M13/3715 , H03M13/6325 , H03M13/6343 , H03M13/658
摘要： In one embodiment a data decoding apparatus includes first and second decoding blocks configured to decode codeword bits in a first mode determined by a first probability of non-standard errors and a second mode determined by a second probability of non-standard errors. The apparatus also includes a mode modification logic configured to cause at least one of the first and second decoding blocks to operate in the second mode when the first and second decoding blocks fail to decode the codeword bits in the first mode. In another embodiment, a method includes decoding codeword bits in a first mode determined by a first probability of non-standard errors. When decoding the codeword bits in the first mode fails to decode the codeword bits, the codeword bits are decoded in a second mode determined by a second probability of non-standard errors.
摘要翻译：在一个实施例中，数据解码装置包括第一和第二解码块，其被配置为以由非标准错误的第一概率确定的第一模式和由非标准错误的第二概率确定的第二模式来解码码字比特。该装置还包括模式修改逻辑，其被配置为当第一和第二解码块在第一模式中不能解码码字比特时，使第一和第二解码块中的至少一个在第二模式中操作。在另一个实施例中，一种方法包括以由非标准错误的第一概率确定的第一模式来解码码字比特。当在第一模式中对码字比特进行解码时，解码码字比特不能解码，码字比特以由非标准错误的第二概率确定的第二模式进行解码。

7. 发明授权

US08730609B1 DC shift detection and correction 有权
标题翻译：直流偏移检测和校正
公开(公告)号：US08730609B1
公开(公告)日：2014-05-20
申请号：US13683638
申请日：2012-11-21
申请人： Marvell International Ltd.
发明人： Heng Tang , Yu-Yao Chang , Panu Chaichanavong , Michael Madden , Gregory Burd
IPC分类号： G11B5/035 , G11B5/02 , G11B5/09 , H04L25/06 , H04L25/10 , H04B1/10
CPC分类号： G11B20/10203 , G11B5/012 , G11B5/09 , G11B20/10018 , G11B20/10046 , G11B20/10268
摘要： A system including a first filter module and a second filter module. The first filter module is configured to (i) pass a first DC shift in an input signal and (ii) convert a second DC shift in the input signal to a first component and a second component. The first DC shift is shorter in duration than the second DC shift. The second filter module is configured to detect one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift. In response to detecting one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift, the second filter module is configured to filter one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift.
摘要翻译：一种包括第一过滤器模块和第二过滤器模块的系统。第一滤波器模块被配置为（i）在输入信号中传递第一DC偏移，并且（ii）将输入信号中的第二DC移位转换为第一分量和第二分量。持续时间的第一个直流偏移比第二个直流偏移更短。第二滤波器模块被配置为检测（i）第一DC偏移和（ii）第二DC偏移的第一分量和第二分量中的一个或多个。响应于检测（i）第一DC偏移和（ii）第二DC偏移的第一分量和第二分量中的一个或多个，第二过滤器模块被配置为过滤（i）第一DC 移动和（ii）第二DC移位的第一分量和第二分量。

8. 发明授权

US10128981B1 Message-passing decoder with fast convergence and reduced storage 有权
公开(公告)号：US10128981B1
公开(公告)日：2018-11-13
申请号：US15652747
申请日：2017-07-18
申请人： Marvell International Ltd.
发明人： Panu Chaichanavong
IPC分类号： H04L1/00
摘要： A message-passing decoder operates by storing, at a check node, a minimum value, a next-to-minimum value, an edge location of the minimum value, and information regarding the signs of incoming messages. For an edge which is not the location of a previous minimum value, the minimum value and the next-to-minimum value, and the location of the minimum value, are set based on the magnitude of an incoming message. For an edge which is the location of the previous minimum value, the minimum value and the next-to-minimum value are set based on the magnitude of an incoming message, and when the magnitude of the incoming message is at most equal to the previous next-to-minimum value, the location of the minimum value is set to the respective edge, and when the magnitude of the incoming message is greater than the previous next-to-minimum value, the location of the minimum value is approximated.

9. 发明授权

US09838044B1 Noise-predictive detector adaptation with corrected data 有权
公开(公告)号：US09838044B1
公开(公告)日：2017-12-05
申请号：US15154831
申请日：2016-05-13
申请人： Marvell International Ltd.
发明人： Panu Chaichanavong
IPC分类号： H04L27/06 , H03M13/39 , H04L1/00 , H03M13/11 , H03M13/41
CPC分类号： H03M13/3961 , H03M1/08 , H03M13/1111 , H03M13/2957 , H03M13/4138 , H03M13/4146 , H03M13/6325 , H04L1/0045 , H04L1/005 , H04L1/0054
摘要： The present disclosure includes apparatus, systems, and techniques relating to noise-predictive detector adaptation. A described technique includes operating a decoder system to decode codewords that are based on a received encoded signal by processing the codewords and exchanging information between path and code decoders, operating the path decoder to use estimation parameters to produce first and second paths based on a codeword of the codewords, operating the code decoder to produce a decoded path based on the codeword; determining a winning path of first and second paths based on whether the decoded path matches the first path or the second path; and updating, based on one or more error terms and the winning path, the estimation parameters to favor selection of the winning path by the path decoder and to disfavor selection of a losing path of the first and second paths by the path decoder.

10. 发明授权

US08806289B1 Decoder and decoding method for a communication system 有权
标题翻译：一种通信系统的解码和解码方法
公开(公告)号：US08806289B1
公开(公告)日：2014-08-12
申请号：US14065751
申请日：2013-10-29
申请人： Marvell International Ltd.
发明人： Engling Yeo , Panu Chaichanavong
IPC分类号： G06F11/00
CPC分类号： H03M13/6331 , H03M13/1105 , H03M13/4138 , H03M13/6561
摘要： A decoder for a communication system includes a channel detection module configured to receive initial estimates of respective code words, wherein the initial estimates of the respective code words correspond to a signal received via a communication channel, arrange the initial estimates of the respective code words into a plurality of groups, and generate probability information associated with selected data bits of the respective code words in the plurality of groups, wherein the probability information indicates probabilities of decoding decisions of the selected data bits. A computation module is configured to generate bit estimations for each of the selected data bits based on the probability information and feedback information. A decoding module is configured to selectively generate, the feedback information and an estimate signal corresponding to the respective code words.
摘要翻译：一种用于通信系统的解码器包括：信道检测模块，被配置为接收各个码字的初始估计，其中相应码字的初始估计对应于经由通信信道接收到的信号，将各个码字的初始估计排列成多个组，并且生成与多个组中的相应代码字的选定数据位相关联的概率信息，其中概率信息指示所选数据位的解码决定的概率。计算模块被配置为基于概率信息和反馈信息来生成针对每个所选数据比特的比特估计。解码模块被配置为选择性地生成与各个代码字对应的反馈信息和估计信号。

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