World's Best Scientists 2026 revealed!
William E. Ryan

William E. Ryan

D-Index & Metrics

Computer Science

D-Index
33
Citations
6866
World Ranking
12449
National Ranking
5048

William E. Ryan publication distribution in Computer Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Computer Science in 2026. The highlighted bar marks where William E. Ryan sits on this spectrum.

32–41 publications: 7 scientists 42–51 publications: 22 scientists 52–61 publications: 82 scientists 62–71 publications: 134 scientists 72–81 publications: 249 scientists 82–91 publications: 324 scientists 92–101 publications: 421 scientists 102–111 publications: 420 scientists 112–121 publications: 497 scientists 122–131 publications: 544 scientists 132–141 publications: 555 scientists 142–151 publications: 609 scientists 152–161 publications: 559 scientists 162–171 publications: 534 scientists 172–181 publications: 556 scientists 182–191 publications: 583 scientists 192–201 publications: 519 scientists 202–211 publications: 508 scientists 212–221 publications: 490 scientists 222–231 publications: 437 scientists 232–241 publications: 423 scientists 242–251 publications: 408 scientists 252–261 publications: 377 scientists 262–271 publications: 301 scientists 272–281 publications: 335 scientists 282–291 publications: 320 scientists 292–301 publications: 293 scientists 302–311 publications: 250 scientists 312–321 publications: 238 scientists 322–331 publications: 206 scientists 332–341 publications: 209 scientists 342–351 publications: 208 scientists 352–361 publications: 162 scientists 362–371 publications: 176 scientists 372–381 publications: 127 scientists 382–391 publications: 158 scientists 392–401 publications: 128 scientists 402–411 publications: 104 scientists 412–421 publications: 94 scientists 422–431 publications: 99 scientists 432–441 publications: 83 scientists 442–451 publications: 108 scientists 452–461 publications: 73 scientists 462–471 publications: 77 scientists 472–481 publications: 69 scientists 482–491 publications: 84 scientists 492–501 publications: 62 scientists 502–511 publications: 54 scientists 512–521 publications: 57 scientists 522–531 publications: 51 scientists 532–541 publications: 51 scientists 542–551 publications: 32 scientists 552–561 publications: 38 scientists 562–571 publications: 28 scientists 572–581 publications: 43 scientists 582–591 publications: 33 scientists 592–601 publications: 41 scientists 602–611 publications: 32 scientists 612–621 publications: 28 scientists 622–631 publications: 25 scientists 632–641 publications: 27 scientists 642–651 publications: 17 scientists 652–661 publications: 20 scientists 662–671 publications: 17 scientists 672–681 publications: 15 scientists 682–691 publications: 14 scientists 692–701 publications: 21 scientists 702–711 publications: 13 scientists 712–721 publications: 12 scientists 722–731 publications: 19 scientists 732–741 publications: 14 scientists 742–751 publications: 12 scientists 752–761 publications: 10 scientists 762–771 publications: 10 scientists 772–781 publications: 11 scientists 782–791 publications: 10 scientists 792–801 publications: 11 scientists 802–811 publications: 8 scientists 812–821 publications: 8 scientists 822–831 publications: 7 scientists 832–841 publications: 11 scientists 842–851 publications: 10 scientists 852–861 publications: 5 scientists 862–871 publications: 9 scientists 872–881 publications: 4 scientists 882–891 publications: 6 scientists 892–901 publications: 3 scientists 902–911 publications: 6 scientists 912–921 publications: 3 scientists 922–931 publications: 2 scientists 932–941 publications: 2 scientists 942–951 publications: 2 scientists 952–961 publications: 3 scientists 962–971 publications: 3 scientists 972–981 publications: 3 scientists 982–990 publications: 5 scientists 991+ publications: 100 scientists
32 publications 991+

This scientist: 162 publications — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 991 publications or more.

William E. Ryan D-index placement in Computer Science in 2026

The chart shows the D-index (discipline H-index) distribution of Computer Science scientists ranked by Research.com in 2026. The highlighted bar marks where William E. Ryan sits on this spectrum.

30–31 D-Index: 879 scientists 32–33 D-Index: 983 scientists 34–35 D-Index: 918 scientists 36–37 D-Index: 990 scientists 38–39 D-Index: 968 scientists 40–41 D-Index: 907 scientists 42–43 D-Index: 821 scientists 44–45 D-Index: 763 scientists 46–47 D-Index: 689 scientists 48–49 D-Index: 543 scientists 50–51 D-Index: 543 scientists 52–53 D-Index: 518 scientists 54–55 D-Index: 500 scientists 56–57 D-Index: 458 scientists 58–59 D-Index: 400 scientists 60–61 D-Index: 337 scientists 62–63 D-Index: 308 scientists 64–65 D-Index: 292 scientists 66–67 D-Index: 249 scientists 68–69 D-Index: 213 scientists 70–71 D-Index: 192 scientists 72–73 D-Index: 189 scientists 74–75 D-Index: 165 scientists 76–77 D-Index: 139 scientists 78–79 D-Index: 119 scientists 80–81 D-Index: 121 scientists 82–83 D-Index: 113 scientists 84–85 D-Index: 88 scientists 86–87 D-Index: 87 scientists 88–89 D-Index: 75 scientists 90–91 D-Index: 69 scientists 92–93 D-Index: 57 scientists 94–95 D-Index: 46 scientists 96–97 D-Index: 38 scientists 98–99 D-Index: 34 scientists 100–101 D-Index: 36 scientists 102–103 D-Index: 27 scientists 104–105 D-Index: 37 scientists 106–107 D-Index: 18 scientists 108–109 D-Index: 31 scientists 110–111 D-Index: 19 scientists 112–113 D-Index: 16 scientists 114–115 D-Index: 12 scientists 116–117 D-Index: 20 scientists 118–119 D-Index: 15 scientists 120–121 D-Index: 5 scientists 122–123 D-Index: 20 scientists 124–125 D-Index: 8 scientists 126–127 D-Index: 5 scientists 128–129 D-Index: 7 scientists 130 D-Index: 3 scientists 131+ D-Index: 98 scientists
30 D-Index 131+

This scientist: 33 D-Index — 13th percentile

13% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 131 D-Index or more.

Overview

What is he best known for?

The fields of study he is best known for:

  • Telecommunications
  • Algorithm
  • Electrical engineering

His scientific interests lie mostly in Low-density parity-check code, Concatenated error correction code, Algorithm, Turbo code and Linear code. His Low-density parity-check code research is multidisciplinary, relying on both EXIT chart, Phase-shift keying, Gray code and Arithmetic. His research in Concatenated error correction code intersects with topics in Discrete mathematics and Theoretical computer science.

His work is dedicated to discovering how Algorithm, Bit error rate are connected with Link adaptation and Orthogonal frequency-division multiplexing and other disciplines. His Linear code study is associated with Block code. His Decoding methods study integrates concerns from other disciplines, such as Error detection and correction and Code.

His most cited work include:

  • Channel Codes: Classical and Modern (559 citations)
  • Design of efficiently encodable moderate-length high-rate irregular LDPC codes (300 citations)
  • An Introduction to LDPC Codes (175 citations)

What are the main themes of his work throughout his whole career to date?

William E. Ryan mainly focuses on Algorithm, Low-density parity-check code, Communication channel, Concatenated error correction code and Turbo code. His Algorithm study incorporates themes from Code rate and Bit error rate. His research integrates issues of Discrete mathematics, Polynomial code, Error detection and correction and Reed–Solomon error correction in his study of Low-density parity-check code.

His Communication channel study combines topics from a wide range of disciplines, such as Viterbi algorithm and Detector. His Concatenated error correction code research integrates issues from Linear code and Error floor. His work deals with themes such as Theoretical computer science, Convolutional code, Encoder, Forward error correction and Puncturing, which intersect with Turbo code.

He most often published in these fields:

  • Algorithm (53.24%)
  • Low-density parity-check code (43.88%)
  • Communication channel (38.85%)

What were the highlights of his more recent work (between 2007-2021)?

  • Low-density parity-check code (43.88%)
  • Algorithm (53.24%)
  • Decoding methods (28.78%)

In recent papers he was focusing on the following fields of study:

William E. Ryan spends much of his time researching Low-density parity-check code, Algorithm, Decoding methods, Concatenated error correction code and Communication channel. His study in Low-density parity-check code is interdisciplinary in nature, drawing from both Discrete mathematics and Block code. His studies in Algorithm integrate themes in fields like Code rate, Additive white Gaussian noise and Bit error rate.

His Decoding methods research incorporates elements of Graph theory, Theoretical computer science and Code. William E. Ryan focuses mostly in the field of Concatenated error correction code, narrowing it down to topics relating to Error detection and correction and, in certain cases, Encoder. His Turbo code research includes elements of Cyclic code, Serial concatenated convolutional codes, Convolutional code and Forward error correction.

Between 2007 and 2021, his most popular works were:

  • Channel Codes: Classical and Modern (559 citations)
  • Low-floor decoders for LDPC codes (137 citations)
  • Coding for Optical Channels (112 citations)

Best Publications

  • Channel Codes: Classical and Modern

    William E. Ryan;Shu Lin

  • Design of efficiently encodable moderate-length high-rate irregular LDPC codes

    M. Yang;W.E. Ryan;Yan Li

  • An Introduction to LDPC Codes

    William E. Ryan

  • Coding for Optical Channels

    Ivan Djordjevic;William Ryan;Bane Vasic

  • Punctured turbo-codes for BPSK/QPSK channels

    O.F. Acikel;W.E. Ryan

  • Low-floor decoders for LDPC codes

    Yang Han;W. Ryan

  • Efficient error-correcting codes in the short blocklength regime

    Mustafa Cemil Coskun;Mustafa Cemil Coskun;Giuseppe Durisi;Thomas Jerkovits;Gianluigi Liva

  • Adaptive Modulation and Coding for IEEE 802.11n

    Fei Peng;Jinyun Zhang;W.E. Ryan

  • Quasi-Cyclic Generalized LDPC Codes With Low Error Floors

    Gianluigi Liva;William E. Ryan;Marco Chiani

  • Performance of high rate turbo codes on a PR4-equalized magnetic recording channel

    W.E. Ryan

  • Design of LDPC Codes: A Survey and New Results

    Gianluigi Liva;Shumei Song;Lan Lan;Yifei Zhang

  • Bit-reliability mapping in LDPC-coded modulation systems

    Y. Li;W.E. Ryan

  • Enumerators for Protograph-Based Ensembles of LDPC and Generalized LDPC Codes

    S Abu-Surra;D Divsalar;W E Ryan

  • 2-D Magnetic Recording: Read Channel Modeling and Detection

    A.R. Krishnan;R. Radhakrishnan;B. Vasic;A. Kavcic

  • Concatenated Convolutional Codes and Iterative Decoding

    William E. Ryan

  • LDPC decoder strategies for achieving low error floors

    Yang Han;W.E. Ryan

  • Mutual-Information-Based Adaptive Bit-Loading Algorithms for LDPC-Coded OFDM

    Yan Li;W.E. Ryan

  • Performance of adaptive Volterra equalizers on nonlinear magnetic recording channels

    W.E. Ryan;A. Gutierrez

  • Toward low LDPC-code floors: a case study

    Yifei Zhang;W. Ryan

  • Structured IRA Codes: Performance Analysis and Construction

    Yifei Zhang;W.E. Ryan

Frequent Co-Authors

Shu Lin
Shu Lin University of California, Davis
Khaled Abdel-Ghaffar
Khaled Abdel-Ghaffar University of California, Davis
Bane Vasic
Bane Vasic University of Arizona
Daniel J. Costello
Daniel J. Costello University of Notre Dame
Ivan B. Djordjevic
Ivan B. Djordjevic University of Arizona
Ali Ghrayeb
Ali Ghrayeb Hamad bin Khalifa University
Gianluigi Liva
Gianluigi Liva German Aerospace Center
Dariush Divsalar
Dariush Divsalar Jet Propulsion Lab
Marco Chiani
Marco Chiani University of Bologna
Aleksandar Kavcic
Aleksandar Kavcic University of Hawaii at Manoa

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