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21.
公开(公告)号:DE112012004886B4
公开(公告)日:2016-06-23
申请号:DE112012004886
申请日:2012-11-09
Applicant: IBM
Inventor: HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
IPC: G11B5/035
Abstract: Verfahren, um auszuwählen, welche Tap-Koeffizienten (H0, ..., H16) eines programmierbaren Equalizers (108) mit endlicher Impulsantwort (FIR) festzusetzen sind, wobei das Verfahren aufweist: Durchführen (402) einer anfänglichen Kalibrierung, um einen Anfangswert für jeden Tap-Koeffizienten eines FIR-Equalizers zu ermitteln; Erzeugen eines ersten Signalverlaufs (500) durch Interpolation der Impulsantwort des adaptiven FIR-Filters unter Verwendung der Anfangswerte, wobei der Verlauf des ersten Signals eine Anzahl von Spitzen enthält, deren jeweilige Höhen dem betreffenden Anfangswert entsprechen; Durchführen einer Faltungs-Operation mit einer sinc-Funktion am ersten Signalverlauf, um einen zweiten Signalverlauf (502) zu erzeugen, der eine modifizierte Version des ersten Signalverlaufs darstellt, wobei der zweite Signalverlauf eine Vielzahl von Schleifen aufweist; Analysieren des zweiten Signalverlaufs, um mindestens eine Schleife des zweiten Signalverlaufs zu ermitteln, welche die größte Fläche besitzt; und Festsetzen des Koeffizienten von mindestens einem Tap, welcher der mindestens einen Schleife am nächsten liegt.
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公开(公告)号:GB2515921A
公开(公告)日:2015-01-07
申请号:GB201414771
申请日:2013-03-20
Applicant: IBM
Inventor: CIDECIYAN ROY D , HUTCHINS ROBERT A , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: In one embodiment, a method includes executing a first forward loop of a detection algorithm on a block of signal samples during a first time interval, executing a first reverse loop of the detection algorithm on the block during a second time interval to produce first soft information, executing a decoding algorithm on the block during a third time interval using the first soft information to produce second soft information, executing a second forward loop of the detection algorithm on the block during a fourth time interval using the second soft information, executing a second reverse loop of the detection algorithm on the block during a fifth time interval to produce third soft information, executing the decoding algorithm on the block during a sixth time interval using the third soft information to produce a decoded block of signal samples, and outputting the decoded block of signal samples.
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公开(公告)号:GB2496935A
公开(公告)日:2013-05-29
申请号:GB201214206
申请日:2012-08-09
Applicant: IBM
Inventor: HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
Abstract: The adaptive equaliser in the read channel of a tape drive may not always converge to the best configuration. Convergence to a set of tap coefficients giving a good signal-to-noise ratio is more likely if a small set of selected adjacent taps, for example four of seventeen taps, are fixed at the outset rather than being adaptive in operation. Initial tap values are determined during an initial calibration and a waveform 502 is then derived by convolving an interpolated (upsampled) version 500 of the equalisers impulse response with a sinc function. Those taps closest to the waveform lobe or lobes having the largest area are fixed and the other taps remain adaptive in operation. Initial calibration may involve adapting the equaliser while reading calibration data or simply setting the tap coefficients to values read from the tape or another location.
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公开(公告)号:DE69427135T2
公开(公告)日:2001-09-13
申请号:DE69427135
申请日:1994-12-28
Applicant: IBM
Inventor: CHERUBINI GIOVANNI , OELCER SEDAT , UNGERBOECK GOTTFRIED
IPC: H03H21/00 , H04B3/06 , H04L25/03 , H04L25/497
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公开(公告)号:MX337395B
公开(公告)日:2016-03-02
申请号:MX2014014164
申请日:2013-05-15
Applicant: IBM
Inventor: CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: En una modalidad, un sistema de almacenamiento de datos incluye un canal de escritura para escribir datos a un medio de almacenamiento, el canal de escritura configurado para utilizar un código de modulación concatenado inverso parcial. El canal de escritura incluye lógica apta para codificar conjuntos de datos utilizando un esquema de codificación de C2, lógica apta para agregar un encabezado a cada subunidad del conjunto de datos, lógica apta para codificar los encabezados de los conjuntos de datos con un primer esquema de codificación de modulación, lógica apta para codificar porciones de datos de los conjuntos de datos con un segundo esquema de codificación de modulación, lógica apta para codificar porciones del uno o más conjuntos de datos C2-codificados utilizando un esquema de codificación de C1, lógica apta para combinar las porciones C1-codificadas con los encabezados codificados por modulación del conjunto de datos C2-codificados utilizando un multiplexor y lógica apta para escribir el uno o más conjuntos de datos C1- y C2- codificados combinados a pistas de datos.
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公开(公告)号:DE112013001025T5
公开(公告)日:2015-03-05
申请号:DE112013001025
申请日:2013-03-20
Applicant: IBM
Inventor: HUTCHINS ROBERT A , MITTELHOLZER THOMAS , OELCER SEDAT , CIDECIYAN ROY D
IPC: H03M13/00
Abstract: In einer Ausführungsform schließt ein Verfahren ein Ausführen einer ersten Vorwärtsschleife eines Erkennungsalgorithmus an einem Block von Signalabtastwerten während eines ersten Zeitintervalls, ein Ausführen einer ersten Rückwärtsschleife des Erkennungsalgorithmus am Block während eines zweiten Zeitintervalls, um eine erste Soft-Information zu erzeugen, ein Ausführen eines Decodierungsalgorithmus am Block während eines dritten Zeitintervalls unter Verwendung der ersten Soft-Information, um eine zweite Soft-Information zu erzeugen, ein Ausführen einer zweiten Vorwärtsschleife des Erkennungsalgorithmus am Block während eines vierten Zeitintervalls unter Verwendung der zweiten Soft-Information, ein Ausführen einer zweiten Rückwärtsschleife des Erkennungsalgorithmus am Block während eines fünften Zeitintervalls, um eine dritte Soft-Information zu erzeugen, ein Ausführen des Decodierungsalgorithmus am Block während eines sechsten Zeitintervalls unter Verwendung der dritten Soft-Information, um einen decodierten Block von Signalabtastwerten zu erzeugen, und ein Ausgeben des decodierten Blocks von Signalabtastwerten ein.
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公开(公告)号:MX2014014164A
公开(公告)日:2015-02-04
申请号:MX2014014164
申请日:2013-05-15
Applicant: IBM
Inventor: CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: En una modalidad, un sistema de almacenamiento de datos incluye un canal de escritura para escribir datos a un medio de almacenamiento, el canal de escritura configurado para utilizar un código de modulación concatenado inverso parcial. El canal de escritura incluye lógica apta para codificar conjuntos de datos utilizando un esquema de codificación de C2, lógica apta para agregar un encabezado a cada subunidad del conjunto de datos, lógica apta para codificar los encabezados de los conjuntos de datos con un primer esquema de codificación de modulación, lógica apta para codificar porciones de datos de los conjuntos de datos con un segundo esquema de codificación de modulación, lógica apta para codificar porciones del uno o más conjuntos de datos C2-codificados utilizando un esquema de codificación de C1, lógica apta para combinar las porciones C1-codificadas con los encabezados codificados por modulación del conjunto de datos C2-codificados utilizando un multiplexor y lógica apta para escribir el uno o más conjuntos de datos C1- y C2- codificados combinados a pistas de datos.
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公开(公告)号:AU2013269871A1
公开(公告)日:2014-11-13
申请号:AU2013269871
申请日:2013-05-15
Applicant: IBM
Inventor: CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: In one embodiment, a data storage system includes a write channel for writing data to a storage medium, the write channel configured to utilize a partial reverse concatenated modulation code. The write channel includes logic adapted for encoding data sets using a C2 encoding scheme, logic adapted for adding a header to each subunit of the data sets, logic adapted for encoding the headers of the data sets with a first modulation encoding scheme, logic adapted for encoding data portions of the data sets with a second modulation encoding scheme, logic adapted for encoding portions of the one or more C2-encoded data sets using a C1 encoding scheme, logic adapted for combining the C1-encoded portions with the modulation-encoded headers of the C2-encoded data sets using a multiplexer, and logic adapted for writing the one or more combined C1- and C2-encoded data sets to data tracks.
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公开(公告)号:GB2496935B
公开(公告)日:2014-01-29
申请号:GB201214206
申请日:2012-08-09
Applicant: IBM
Inventor: HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
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公开(公告)号:DE60301620T2
公开(公告)日:2006-06-14
申请号:DE60301620
申请日:2003-03-10
Applicant: IBM
Inventor: ELEFTHERIOU S , OELCER SEDAT , ABDELILAH YOUSSEF , DAVIS TAYLOR , DERBY H , HWANG DONGMING , WARE MALCOLM , YE HUA
Abstract: A method and systems for optimizing Asymmetric Digital Subscriber Line (ADSL) connections in DSL Access Multiplexor (DSLAM) that marries benefits of G.dmt and G.lite standards, using a flexible method implemented on a programmable Digital Signal Processor (DSP) and a Network Processor (NP) is disclosed. It provides a means to support full G.dmt rates for any of the attached users as long as less than half the users are actively moving data through the DSLAM, but by only using half the digital signal processing hardware and half the power consumption for the line drivers. The invention allows doubling the number of,ADSL ports available over a conventional scheme given about 20% more power is under 50% with only half the respective connections, all those G.dmt rates possible on their exceeds 50%, gradually active G.lite rates based on either based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates. budget. When the utilization subscribers active on their users experience the maximum wire. However, when utilization subscribers start to experience a fixed policy or one that is based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates.
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