PUBLICATIONS

Book

                  W. E. Ryan and S. Lin, Channel Codes: Classical and Modern, Cambridge University    

                  Press, 2009. (Order here.)

Invited Book Chapters

W. E. Ryan, "Concatenated Codes and Iterative Decoding," in Wiley Encyclopedia of Telecommunications (J. G. Proakis, ed.) New York : Wiley and Sons, 2003. pdf file

W. E. Ryan, "An Introduction to LDPC Codes," in CRC Handbook for Coding and Signal Processing for Recording Systems (B. Vasic, ed.) CRC Press, 2004. pdf file

 

Journals

[1] W. E. Ryan, "Comments on 'Orthogonal convolutional coding for the PPM optical channel'," IEEE J. Lightwave Tech., Vol. 8, p. 1007, June 1990. pdf file

[2] W. E. Ryan and S. G. Wilson, "Two classes of convolutional codes over GF(q) for q-ary orthogonal signaling," IEEE Trans. Comm., Vol. 39, pp. 30-40, Jan. 1991. pdf file

[3] W. E. Ryan, "Comparative performance between drop-out detection and Viterbi reliability metric erasure flagging," IEEE Trans. Magnetics, Vol. 28, pp. 2898-2900, Sept. 1992. pdf file

[4] W. E. Ryan and P. Conoval, "A method of analysis for interleaved Reed-Solomon coding with erasure decoding on burst-error channels," IEEE Trans. Comm., Vol. 41, pp. 430-434, March 1993. pdf file

[5] W. E. Ryan and A. Gutierrez, "Performance of adaptive Volterra equalizers on nonlinear magnetic recording channels," IEEE Trans. Magnetics, Vol. 31, pp. 3054-3056, Nov. 1995. pdf file

[6] W. Ryan and N. Yeh , "Viterbi detector for PR4-equalized magnetic recording channels with transition-shift and partial-erasure nonlinearities," IEEE Trans. Magnetics, Vol. 32, pp. 3950-3952, Sept. 1996. pdf file

[7] W. Ryan, "Optimal signaling for meteor burst channels," IEEE Trans. Comm., Vol. 45, pp. 489-496, May 1997.  pdf file

[8] W. Ryan and B. Zafer, "A study of class I partial response signaling for magnetic recording," IEEE Trans. Magnetics, Vol. 33, pp. 4543-4550, Nov. 1997. pdf file

[9] W. Ryan, Li Han, and P. Quintana, "Design of a low-orbit to geostationary satellite link for maximal throughput," IEEE Trans. Comm., Vol. 45, pp. 988-996, August 1997. pdf file

[10] O. Acikel and W. E. Ryan, "Punctured turbo codes for BPSK/QPSK channels," IEEE Trans. Comm., Vol. 47, pp. 1315-1323, Sept. 1999. pdf file

[11] A. Gutierrez and W. Ryan, "Performance of Volterra and MLSD Receivers for Nonlinear Bandlimited Satellite Systems," IEEE Trans. Comm., Vol. 48, pp. 1171-1177, July 2000. pdf file

[12] W. Ryan, A. Ghrayeb, and N. Yeh, "Performance of random-access-memory-based equalizers in magnetic recording," IEEE Trans. Magnetics, Vol. 36, pp. 4028-4035, Nov. 2000. pdf file

[13] W. Ryan, "Optimal code rates for concatenated codes on a PR4-equalized magnetic recording channel," IEEE Trans. Magnetics, Vol. 36, pp. 4044-4049, Nov. 2000. pdf file

[14] W. Ryan, "Concatenated codes for class IV partial response channels," IEEE Trans. Comm., Vol. 49, pp. 445-454, March 2001. pdf file

[15] R. Ramamurthy and W. Ryan, "Convolutional Double Accumulate Codes (or Double Turbo DPSK," IEEE Comm. Letters, Vol. 5, pp. 157-159, April 2001. pdf file

[16] A. Ghrayeb and W. Ryan, "Concatenated code system design for storage channels," IEEE J. Selected Areas in Comm., Vol. 19, pp. 709-718, April 2001. pdf file


[17] S. Yang, A. Kavcic, and W. E. Ryan, "Optimizing the Bit Aspect Ratio of a Recording System Using an Information-Theoretic Criterion," IEEE Trans. Magnetics, Vol. 39, pp. 2228-2230, Sept. 2003.  pdf file

[18] A. Muqattash, M. Krunz, and W. E. Ryan, "Solving the Near-Far Problem in CDMA-Based Ad Hoc Networks," Elsevier Ad Hoc Networks Journal, pp. 435-453, Nov. 2003.  pdf file

[19] M. Yang and W. E. Ryan, "Performance of efficiently encodable LDPC codes in noise bursts on the EPR4 channel," IEEE Trans. Magn., pp. 507-512, March, 2004. pdf file

[20] M. Yang, W. E. Ryan, and Y. Li, "Design of efficiently encodable moderate-length high-rate irregular LDPC codes," IEEE Trans. Comm., pp. 564-571, April, 2004.  pdf file

[21] W. E. Ryan and Z. Tang, "Reduced-complexity error state diagrams in TCM and ISI channel performance evaluation," IEEE Trans. Comm., pp. 2047-2051, Dec. 2004. pdf file

[22] Y. Li and W. E. Ryan, "Bit-reliability mapping in LDPC-coded modulation systems," IEEE Comm. Letters, pp. 1-3, Jan. 2005. pdf file

 [23] W. E. Ryan, F. Wang, R. Wood, and Y. Li, "Optimal code rates for the Lorentzian channel: Shannon codes and LDPC codes," IEEE Trans. Magn., pp. 3559-3565, Nov. 2004. pdf file

[24] Y. Han and W. E. Ryan, "Packet-LDPC codes for tape drives," IEEE Trans.       Magnetics, pp. 1340-1347, April 2005. pdf file

[25] B. Xia and W. E. Ryan, "Importance sampling for tanner trees," IEEE Trans. Info. Theory, Vol. 51, No. 6, pp. 2183-2189, June 2005. pdf file

[26] Z. Tang and W. E. Ryan, "Achievable information rates and the coding-spreading   tradeoff in finite-sized synchronous CDMA systems," IEEE Trans. on Wireless Comm., pp. 1432-1437, Sept. 2005. pdf file

[27] F. Peng, M. Yang, and W. E. Ryan, " Simplified eIRA code design and performance analysis for correlated Rayleigh fading channels," IEEE Trans. on Wireless Comm., pp. 720-725, April 2006. pdf file

[28] F. Peng, W. E. Ryan, and R. D. Wesel, "Surrogate-channel design of universal  LDPC codes," IEEE Comm. Letters, pp. 480-482, June 2006. pdf file      degree-distribution data here:  pdf file

[29] L. H. Miles, J. W. Gambles, G. K. Maki, W. E. Ryan, S. R. Whitaker, "An 860-Mb/s   (8158,7136) Low-Density Parity-Check Encoder," IEEE J. Solid-State Circuits, pp. 1686-1691, Aug. 2006. pdf file

[30] Y. Han and W. E. Ryan, "Concatenating a structured LDPC code and an RLL code to preserve soft-decoding, structure, and burst correction," IEEE Trans. Magnetics, pp. 2558-2560, Oct. 2006. pdf file

[31] Y. Zhang and W. E. Ryan, "Structured eIRA codes," to appear, IEEE Trans. Comm., 2006. pdf file 

[32] G. Liva, S. Song, L. Lan, Y. Zhang, W. Ryan, and S. Lin, "Design of LDPC codes: A survey and new results," to appear, J. Comm. Software and Systems, 2006. pdf file

[33] Y. Li and W. E. Ryan, "Mutual-information-based adaptive bit-loading algorithms for LDPC-coded OFDM," to appear, IEEE Trans. Wireless Comm.,  pdf file

[34] G. Liva, W. E. Ryan, and M. Chiani, "Quasi-cyclic generalized LDPC codes with low floors," in 2nd review, IEEE Trans. Comm.

  

Conferences

[1] W. E. Ryan and J. M. Schumpert, "Time Delay Estimation for Spread Spectrum Signals Using Generalized Cross Correlation," Proc. 1985 ICASSP, Vol. 10, pp. 168-171, April 1985. pdf file

[2] W. E. Ryan and S. G. Wilson, "Convolutional Coding over GF(q) with Application to Frequency-Hopping Channels," Proc. 1987 Conf. Inf. Sys. and Sci.

[3] W. E. Ryan and S. G. Wilson, "Convolutional Coding over GF(q) with Application to Frequency-Hopping Channels," 1987 IEEE MILCOM Conf. Rec. 

[4] W. E. Ryan, "Comparative performance between drop-out detection and Viterbi reliability metric erasure flagging," IEEE International Magnetics Conference, Digests of Intermag'92, p. 325, April 1992. pdf file

[5] W. E. Ryan and Li Han, "Modulation and Coding for Short-Duration Deterministically Time-Varying Channels," Proc. 1995 IEEE Int. Conf. on Comm., Vol. 3, pp. 1790-1794, June 1995. pdf file

[6] P. Quintana and W. E. Ryan, "Optimal parameters for a low orbit to geostationary satellite link," Proc. 1995 IEEE Int. Conf. on Comm., Vol. 3, pp. 1870-1874, June 1995. pdf file

[7] A. Gutierrez and W. E. Ryan, "Performance of adaptive Volterra equalizers on nonlinear satellite channels," Proc. 1995 IEEE Int. Conf. on Comm., Vol., 1, pp. 488-492, June 1995. pdf file

[8] W. Ryan and B. Zafer, "Performance comparison between PR1 and PR4 signaling on high-density magnetic recording channels," Proc. 1996 IEEE Int. Conf. on Comm., Vol. 1, pp. 587-591, June 1996. pdf file

[9] A. Gutierrez and W. Ryan, "The performance of MLSD receivers on nonlinear satellite channels," Proc. 1996 IEEE Int. Conf. on Comm., Vol. 2, pp. 921-925, June 1996. pdf file

[10] O. Acikel and W. Ryan, "Lossless compression of telemetry data," Int. Conf.Telemetry, San Diego, Oct. 1996. 


[11] B. Zafer and W. Ryan, "Performance Comparison of Selected DC-Free Codes for PR1-Equalized Magnetic Recording Channels," Proc. 1997 IEEE Int. Conf. on Comm., Vol. 3, pp. 1638-1643, June 1997.  pdf file

  
[12] W. Ryan, "Performance of high rate turbo codes on a PR4-equalized magnetic recording channel," Proc. 1998 Int. Conf. on Comm. Vol. 2, pp. 947-951, June 1988. pdf file

  
[13] O. Acikel and W. Ryan, "High rate turbo codes for BPSK/QPSK channels," Proc.1998 Int. Conf. on Comm. Vol. 1, pp. 422-427, June 1998. pdf file

  
[14] W. Ryan, L. McPheters, and S. McLaughlin, "Combined turbo coding and turbo equalization for PR4-equalized Lorentzian channels," 1998 Conf. on Inf. Sciences and Systems, Princeton University. pdf file

 
[15] J. LeBlanc, R. Kennedy, and W. Ryan, "Pre-cursor extended RAM-DFE canceller (PERC) nonlinear equalizer for nonlinear ISI channels," The Eighth Digital Signal Processing Workshop, Bryce Canyon, Utah, Aug. 1998. 

[16] A. Ghrayeb and W. Ryan, "RAM-Search algorithms for nonlinear ISI cancellation in magnetic recording," Proc. IEEE 1998 GlobeCom Conf., Vol. 6, pp. 3368-3373, Nov. 1998. pdf file

[17] W. Ryan, "Optimal code rates for concatenated codes on a PR4-equalized channel," 1999 Conf. on Inf. Sciences and Systems, Johns Hopkins University. pdf file

[18] W. Ryan, J. LeBlanc, and R. Kennedy, "Performance study of RAM-based decision feedback equalizers with application to nonlinear satellite channels," Proceedings of the Fifth International Symposium on Signal Processing and Its Applications, Vol. 1, pp. 407-410, Aug. 1999, Brisbane, Australia. pdf file


[19] A. Ghrayeb and W. Ryan, "Performance of high rate turbo codes employing the soft-output Viterbi algorithm (SOVA)," 1999 Conference Record of the Thirty-Third Asilomar Conference on Signals, Systems, and Computers, Vol., 2, pp. 1665-1669, Oct. 1999. pdf file

[20] W. Ryan, "Design considerations for concatenating convolutional codes with partial response channels," Proc. 37th Allerton Conf., pp. 1324-1333, Sept. 1999. (invited) pdf file

  
[21] D. Goeckel, W. Ryan, and P. Ormeci, "On iterative adaptive signaling for wideband wireless channels," SPIE's 14th Annual Int. Symp. on Aerospace/Defense Sensing, Simulations, and Controls (Proc. of SPIE 4045, May 2000). (invited)

  
[22] O. Acikel and W. Ryan, "Punctured high rate SCCCs for BPSK/QPSK channels," Proc. 2000 IEEE International Conference on Comm., Vol. 1, pp. 434-439, June 2000.  pdf file

[23] A. Ghrayeb and W. Ryan, "Concatenated coding and iterative SOVA decoding with PR4 signaling," Proc. 2000 IEEE International Conference on Comm., Vol. 2, pp. 597 -601, June 2000. pdf file

[24] W. Ryan, S. McLaughlin, K. Anim-Appiah, M. Yang, "Turbo, LDPC, and RLL codes in magnetic recording," Proc. 2nd Int. Symp. on Turbo Codes and Related Topics, Sept. 2000.  pdf file

  
[25] W. Ryan and A. Ghrayeb, "Precoder design for concatenating convolutional codes with intersymbol interference channels," Proc. 2000 Wireless Communications and Networking Conference, Vol. 3, pp. 1013 -1018, Sept. 2000. (invited)   pdf file


[26] A. Ghrayeb and W. E. Ryan, "Precoder design for concatenating convolutional codes with generalized partial response channels," Proc. 2000 IEEE Global Telecommunications Conference, Vol. 3, pp. 1859 -1864, Nov/Dec 2000.  pdf file

 
[27] R. Ramamurthy and W. E. Ryan, "Convolutional double accumulate codes (or double turbo DPSK)," Proc. 2000 IEEE Global Telecommunications Conference, Vol. 2, pp. 795 -800, Nov/Dec 2000.  pdf file

[28] M. Yang and W. E. Ryan, "Performance of (quasi-)cyclic LDPC codes in noise bursts on the EPR4 channel," Proc. 2001 Global Telecommunications Conference, Vol. 5, pp. 2961 -2965, Nov. 2001. pdf file

 
[29] B. Xia and W. E. Ryan, "Near-optimal convolutionally coded synchronous CDMA with iterative multiuser detection/decoding," Proc. 2001 Global Telecommunications Conference, Vol. 2, pp. 767 -771, Nov. 2001. pdf file

[30] A. L. Perez and W. E. Ryan, "Iterative detection and decoding on nonlinear ISI channels," Proc. 2002 IEEE International Conference on Communications, Vol. 3, pp. 1501 -1505, April/May 2002. pdf file

[31] B. Xia and W. E. Ryan, "Near-optimal convolutionally coded asynchronous CDMA with iterative multiuser detection/decoding," Proc. 2002 IEEE International Conference on Communications, Vol. 3, pp. 1521 -1525, April/May 2002. pdf file

[32] K. L. Virga, C. L. Hammond, D. Beauvarlet, and W. E. Ryan, "Indoor propagation measurements using low profile and directional dual exponentially tapered slot antennas," The 5th International Symposium on Wireless Personal Multimedia Communications, Vol. 1, pp. 193-197, Oct. 2002. pdf file

[33] M. Yang and W. E. Ryan, "Design of LDPC codes for two-state fading channel models," The 5th International Symposium on Wireless Personal Multimedia Communications, Vol. 3, pp. 986 -990, Oct. 2002. pdf file

 [34] M. Yang, Y. Li, and W. E. Ryan, "Design of efficiently encodable moderate-length high-rate irregular LDPC codes," Proc. 41st Allerton Conf., Oct. 2002. pdf file

[35] B. Xia and W. E. Ryan, "On importance sampling for linear block codes," Proc. 2003 IEEE International Conference on Communications, Vol. 4, pp. 2904 -2908, May 2003. pdf file

[36] B. Xia and W. E. Ryan, "Importance sampling for loop-free decoding trees with application to low-density parity-check codes," Proc. 2003 Int. Symp. on Information Theory, p. 120, Yokohama , Japan, July 2003. pdf file

[37] M. Yang and W. E. Ryan, "Lowering the error-rate floors of moderate-length high-rate irregular LDPC codes," Proc. 2003 Int. Symp. on Information Theory, p. 237, Yokohama, Japan, July 2003. pdf file

[38] Y. Li and W. E. Ryan, "Design of LDPC-coded modulation schemes," Proc. 3rd Int.Symp. on Turbo Codes and Related Topics, Sept. 2003. pdf file

[39] W. E. Ryan, "Optimal code rates for Lorentzian channel models," Proc. 2003 IEEE Global Telecommunications Conference, pp. 3386 - 3391, Dec. 2003. pdf file

[40] Z. Tang and W. E. Ryan, "Achievable information rates and the coding-spreading tradeoff in synchronous CDMA systems," Proc. 2003 IEEE Global Telecommunications Conference, pp. 1877-1881, Dec. 2003. pdf file

[41] B. Xia and W. E. Ryan, "Estimating LDPC codeword error rates via importance sampling," 2004 IEEE Int. Symp. Inf. Theory, p. 473, June-July, 2004. pdf file

[42] F. Peng, M.. Yang, and W. E. Ryan, "Design and Analysis of eIRA codes on Correlated Fading Channels,"IEEE GlobeCom Conference, pp. 503-508, Nov.-Dec. 2004. pdf file

[43] Y. Zhang, W. E. Ryan, and Y. Li, "Structured eIRA codes," 38th Asilomar Conference on Signals, Systems, and Computers, pp. 2005-2009, Nov. 2004. (invited) pdf file

[44] Y. Zhang, W. E. Ryan, and Y. Li, "Structured eIRA codes with low floors," IEEE International Symp. on Inf. Theory, pp. 174-178, Sept. 2005. pdf file

[45]  L. Miles, J. Gamble, G. Maki, W. Ryan, and S. Whitaker , "An (8158, 7136) Low-density parity-check encoder", 2005 IEEE Custom Integrated Circuits Conference., Sept. 2005. 

[46] G. Liva and W. E. Ryan, "Short low-error-floor Tanner codes with Hamming nodes," IEEE MilCom Conf., pp. 208-213, Oct. 2005. pdf file

[46] F. Peng and W. E. Ryan, "New approaches to clipped OFDM channels: modeling and receiver design," IEEE GlobeCom Conference, pp. 1490-1494, Nov.-Dec. 2005. pdf file

[47] Y. Han, W. E. Ryan, and R. D. Wesel, "Dual-mode decoding of product codes with application to tape storage,"  IEEE GlobeCom Conference, pp. 1255-1260, Nov.-Dec. 2005. pdf file

[48] S. Abu-Surra, G. Liva, and W. E. Ryan, "Design and performance of selected classes of Tanner codes," UCSD Workshop on Information Theory and Its Applications, February 2006, http://ita.ucsd.edu/workshop/06/talks/papers/129.pdf. (invited)

[49] S. Abu-Surra, G. Liva, and W. E. Ryan, "Low-floor Tanner codes via Hamming-  node or RSCC-node doping," Lecture Notes in Computer Science, (Proc. of the 16th  AAECC Symposium), vol. 3857, pp. 245--254, February 2006. (invited) pdf file

[50] Y. Han and W. E. Ryan, "Concatenating a structured LDPC code and an RLL code to preserve soft-decoding, structure, and burst correction," 2006 Int. Conf. on Magnetics, April 2006. pdf file

[51]  F. Peng and W. E. Ryan, "A new low-complexity ICI suppression technique for   OFDM fading channels," 2006 IEEE Wireless Communications and Networking  Conference, April 2006. pdf file

[52] Y. Zhang, W. E. Ryan, and F. Peng, "Design of structured eIRA codes with          applications to wireless channels," 2006 IEEE Wireless Communications and Networking Conference, April 2006. pdf file

[53] G. Liva, W. E. Ryan, and M. Chiani, "Design of quasi-cyclic Tanner codes with low error floors," 4th Int. Symp. on Turbo Codes, ISTC-2006, April 2006.  pdf file

[54] F. Peng and W. E. Ryan, "On the capacity of clipped OFDM channels," IEEE Int. Symp. Inf. Theory, July 2006.  pdf file

[55] G. Liva, S. AbuSurra , W. E. Ryan, and M. Chiani, "Tanner codes for high data-rate space applications," AIAA Space Ops 2006 Conference, Rome, Italy, June 2006. pdf file

[56] F. Peng, J. Zhang, and W. E. Ryan, "Adaptive modulation and coding for IEEE802.11n," 2007 IEEE Wireless Communications and Networking Conference. pdf file

[57] S. AbuSurra, G. Liva, and W. E. Ryan, "Design of Generalized LDPC Codes and their Decoders," to be submitted to ...
  

Unpublished (or Web-published) Turbo Code Tutorial
                   W. E. Ryan, "A turbo code tutorial," 1997.  pdf file