Journals

• M. Tanahashi and H. Ochiai, "On the distribution of instantaneous power in single-carrier signals," accepted for publication in IEEE Transactions on Wireless Communications.

• M. Tanahashi and H. Ochiai, "Turbo decoding of concatenated channel coding and trellis shaping for peak power controlled single-carrier systems," IEEE Transactions on Communications, vol. 58, no. 1, pp. 9-15, January 2010.

• M. Tanahashi and H. Ochiai, "A multilevel coded modulation approach for hexagonal signal constellation," IEEE Transactions on Wireless Communications, vol. 8, no. 10, pp. 4993-4997, October 2009.

• K. Ishibashi, K. Ishii, and H. Ochiai, "Bit-interleaved coded DPSK with cyclic delay diversity: Design and analysis," IEEE Transactions on Wireless Communications, vol. 8, no. 9, pp. 4762-4772, September 2009.

• M. Tanahashi and H. Ochiai, "Trellis shaping for controlling envelope of single-carrier high-order QAM signals," IEEE Journal of Selected Topics in Signal Processing, vol. 3, no. 3, pp. 430-437, June 2009.

• M. Tanahashi and H. Ochiai, "Near constant envelope trellis shaping for PSK signaling," IEEE Transactions on Communications, vol. 57, no. 2, pp. 450-458, February 2009.

• K. Ishibashi, H. Ochiai, and R. Kohno, "Embedded forward error control technique (EFECT) for low-rate but low latency communications," IEEE Transactions on Wireless Communications, vol. 7, pp. 1456-1460, May 2008.

• H. Ochiai, P. Mitran, and V. Tarokh, "Variable-rate two-phase collaborative communication protocols for wireless networks," IEEE Transactions on Information Theory, vol. 52, no. 9, pp. 4299-4313, September 2006.

• H. Ochiai, P. Mitran, H. V. Poor, and V. Tarokh, "Collaborative beamforming for distributed wireless ad hoc sensor networks," IEEE Transactions on Signal Processing, vol. 53, no. 11, pp. 4110-4124, November 2005.

• K. Ishibashi, H. Ochiai, and R. Kohno, "Low complexity bit-interleaved coded DAPSK for Rayleigh fading channels," IEEE Journal on Selected Areas in Communications, Special Issue on Differential and Noncoherent Wireless Communications, vol. 23, no. 9, pp. 1728-1738, September 2005.

• P. Mitran, H. Ochiai, and V. Tarokh, "Space-time diversity enhancements using collaborative communications," IEEE Transactions on Information Theory, vol. 51, no. 6, pp. 2041-2057, June 2005.

• H. Ochiai, "A novel trellis shaping design with both peak and average power reduction for OFDM systems," IEEE Transactions on Communications, vol. 52, no. 11, pp. 1916-1926, November 2004.

• G. de Abreu, H. Ochiai, and R. Kohno, "Linear maximum likelihood decoding of space-time block coded OFDM systems for mobile communications," IEE Proceedings - Communications, Special Section on WLAN Systems and Interworking, vol. 151, no. 5, pp. 447-459, October 2004.

• T. Minowa, H. Ochiai, and H. Imai, "Phase noise effects on turbo trellis-coded modulation over M-ary coherent channels," IEEE Transactions on Communications, vol. 52, no. 8, pp. 1333-1343, August 2004.

• A. Ishii, H. Ochiai, and T. Fujino, "Multiple-symbol differential detection for OFDM over both time- and frequency-selective Rayleigh fading channels," EURASIP Journal on Applied Signal Processing, Special Issue on Multicarrier Communications and Signal Processing, vol. 2004, no. 10, pp. 1536-1545, August 2004.

• H. Ochiai, "Performance analysis of peak power and band-limited OFDM system with linear scaling," IEEE Transactions on Wireless Communications, vol. 2, no. 5, pp. 1055-1065, September 2003.

• H. Ochiai and H. Imai, "Performance analysis of deliberately clipped OFDM signals," IEEE Transactions on Communications, vol. 50, no. 1, pp. 89-101, January 2002.

• H. Ochiai and H. Imai, "On the distribution of the peak-to-average power ratio in OFDM signals," IEEE Transactions on Communications, vol. 49, no. 2, pp. 282-289, February 2001.

• H. Ochiai and H. Imai, "Performance of the deliberate clipping with adaptive symbol selection for strictly band-limited OFDM systems," IEEE Journal on Selected Areas in Communications, Wireless Communications Series, vol. 18, no. 11, pp. 2270-2277, November 2000.

• H. Ochiai, M. Fossorier, and H. Imai, "On decoding of block codes with peak-power reduction in OFDM systems," IEEE Communications Letters, vol.4, no.7, pp. 226-228, July 2000.

• H. Ochiai and H. Imai, "MDPSK-OFDM with highly power-efficient block codes for frequency-selective fading channels," IEEE Transactions on Vehicular Technology, vol. 49, no.1, pp. 74-82, January 2000.

• H. Ochiai and H. Imai, "Performance of OFDM-CDMA with simple peak power reduction," European Transactions on Telecommunications, vol. 10, no.4, pp. 391-398, July/August 1999.

• H. Ochiai and H. Imai, "Block coding scheme based on complementary sequences for multicarrier signals," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol.E80-A, no.11, pp. 2136-2143, November 1997.

Selected Conference Papers

• M. Tanahashi and H. Ochiai, "Analysis and efficient computation of instantaneous power distribution of single-carrier signals," in Proceedings of The 2009 IEEE Global Telecommunications Conference (GLOBECOM 2009), Hawaii, December 2009.

• M. Iki, M. Tanahashi, and H. Ochiai, "Peak power reduction of single-carrier signals using trellis shaping with M and stack algorithms," in Proceedings of 2009 IEEE 70th Vehicular Technology Conference Fall (VTC2009-Fall), Anchorage, Alaska, September 2009.

• M. Tanahashi and H. Ochiai, "Improving error rate performance of correlated sources by non-root-Nyquist pulse shaping," in Proceedings of 2009 IEEE 70th Vehicular Technology Conference Fall (VTC2009-Fall), Anchorage, Alaska, September 2009.

• K. Ishibashi, K. Ishii, and H. Ochiai, "Design of adaptive coded cooperation using rate compatible turbo codes," in Proceedings of 2009 IEEE 70th Vehicular Technology Conference Fall (VTC2009-Fall), Anchorage, Alaska, September 2009.

• S. Nakata, M. Tanahashi, and H. Ochiai, "On the performance of cooperative communications with constellation rearrangement," in Proceedings of The 12th International Symposium on Wireless Personal Multimedia Communications (WPMC 2009), Sendai, Japan, September 2009.

• H. Ochiai, "[Invited Paper] Some practical considerations for peak power reduction of OFDM systems," in Proceedings of The 12th International Symposium on Wireless Personal Multimedia Communications (WPMC 2009), Sendai, Japan, September 2009.

• M. Tanahashi and H. Ochiai, "On destructive superposition of shaping pulses in band-limited linear modulation systems," in Proceedings of The 2009 IEEE International Symposium on Information Theory (ISIT 2009), Seoul, Korea, June 2009.

• H. Kitagawa, M. Tanahashi, and H. Ochiai, "FPGA implementation of trellis shaping to control peak power for PSK signals," in Proceedings of The 2009 IEEE International Conference on Communications (ICC 2009), Dresden, Germany, June 2009.

• K. Ishii, K. Ishibashi, and H. Ochiai, "A novel cooperative diversity based on multilevel coded modulation," in Proceedings of The 2009 IEEE International Conference on Communications (ICC 2009), Dresden, Germany, June 2009.

• H. Ochiai and Y. Takayama, "A simple OFDM-based multiple access system with super-orthogonal convolutional codes and Golay sequence," in Proceedings of The 2009 IEEE Wireless Communications and Networking Conference (WCNC 2009), Budapest, Hungary, April 2009.

• T. Uchino and H. Ochiai, "On the performance of clipping noise cancellation for OFDM systems with high-order coded modulation," in Proceedings of The 2008 International Symposium on Information Theory and its Applications (ISITA 2008), Auckland, New Zealand, December 2008.

• M. Tanahashi and H. Ochiai, "Noncoherent iterative decoding of symbol insertion systems," in Proceedings of The 2008 International Symposium on Information Theory and its Applications (ISITA 2008), Auckland, New Zealand, December 2008.

• K. Ishibashi, K. Ishii, and H. Ochiai, "Collaborative diversity enhancements using rate-compatible turbo codes," in Proceedings of The 2008 International Symposium on Information Theory and its Applications (ISITA 2008), Auckland, New Zealand, December 2008.

• K. Ishii, K. Ishibashi, and H. Ochiai, "Multilevel coded cooperation: Concepts and design criteria," in Proceedings of The 2008 International Symposium on Information Theory and its Applications (ISITA 2008), Auckland, New Zealand, December 2008.

• K. Ishibashi, K. Ishii, and H. Ochiai, "Diversity order analysis of bit-interleaved coded DPSK with cyclic delay diversity," in Proceedings of The 2008 IEEE Global Telecommunications Conference (GLOBECOM 2008), New Orleans, December 2008.

• M. Tanahashi and H. Ochiai, "Trellis shaping with flexible control of peak and average power for single-carrier high-order QAM," in Proceedings of The 2008 IEEE Global Telecommunications Conference (GLOBECOM 2008), New Orleans, December 2008.

• T. Tamagawa and H. Ochiai, "An efficient hybrid ARQ system using multilevel coded modulation with reduced constellation size," in Proceedings of The 2008 IEEE Global Telecommunications Conference (GLOBECOM 2008), New Orleans, December 2008.

• M. Tanahashi and H. Ochiai, "A simple modulation code with peak power reduction and coding gain," in Proceedings of The 2008 IEEE International Conference on Communications (ICC 2008), Beijing, China, May 2008.

• M. Tanahashi and H. Ochiai, "Iterative decoding of concatenated channel coding and trellis shaping based on Markov model," in Proceedings of The 2007 IEEE Global Telecommunications Conference (GLOBECOM 2007), pp. 3905-3909, Washington D.C., November 2007.

• K. Ishibashi, H. Ochiai, and R. Kohno, "Embedded forward error control technique(EFECT) for low-rate real-time communications," in Proceedings of The 2007 IEEE Global Telecommunications Conference (GLOBECOM 2007), pp. 4565-4569, Washington D.C., November 2007.

• K. Ishibashi, H. Ochiai, and R. Kohno, "Low complexity bit-interleaved coded DAPSK with cyclic delay diversity," in Proceedings of the IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2007), pp. 1-5, Athens, Greece, September 2007.

• M. Tanahashi and H. Ochiai, "A new trellis shaping approach for pulse-shaped PSK signals with almost constant envelope," in Proceedings of The 2007 IEEE International Conference on Communications (ICC 2007), pp. 5598 - 5603, Glasgow, Scotland, June 2007.

• T. Masakawa and H. Ochiai, "Design of Reed-Solomon codes for OFDM systems with clipping and filtering," in Proceedings of The 2007 IEEE Wireless Communications & Networking Conference (WCNC 2007), pp. 1361-1366, Hong Kong, March 2007.

• M. Tanahashi and H. Ochiai, "A new trellis shaping design for peak power reduction of single-carrier QAM signals," in Proceedings of The 2006 International Symposium on Information Theory and its Applications (ISITA 2006), pp. 81-86, Seoul, Korea, October 2006.

• K. Hiwatashi, H. Ochiai, and J. Shikata, "A new secret key agreement scheme based on eigenvalues of channel matrices in phase-controlled MIMO systems," in Proceedings of The 2006 International Symposium on Information Theory and its Applications (ISITA 2006), pp. 265-270, Seoul, Korea, October 2006.

• H. Ochiai, "Amplifier efficiencies of OFDM systems with peak power and envelope variance reduction," in Proceedings of 2006 IEEE International Symposium on Signal Processing and Information Technology (ISSPIT '06), pp. 828-833, Vancouver, B.C., Canada, August 2006.

• H. Tatsunami, K. Ishibashi, and H. Ochiai, "On the performance of LDPC codes with differential detection over Rayleigh fading channels," in Proceedings of 2006 IEEE 63rd Vehicular Technology Conference (VTC '06 Spring), pp. 2388-2392, Melbourne, Australia, May 2006.

• P. Mitran, H. Ochiai, and V. Tarokh, "Collaborative diversity enhancements for wireless communications," in Proceedings of 2005 IEEE International Conference on Communications (ICC 2005), pp. 2437-2441, Seoul, Korea, May 2005.

• H. Ochiai, P. Mitran, H. V. Poor, and V. Tarokh, "On the effects of phase estimation errors on collaborative beamforming in wireless ad hoc networks," in Proceedings of 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), vol. 3, pp. 657-660, Philadelphia, PA, March 2005.

• H. Ochiai, P. Mitran, H. V. Poor, and V. Tarokh, "Collaborative beamforming in ad hoc networks," in Proceedings of IEEE Information Theory Workshop (ITW) 2004, pp. 396-401, San Antonio, TX, October 2004.

• H. Ochiai, P. Mitran, and V. Tarokh, "Design and analysis of collaborative diversity protocols for wireless sensor networks," in Proceedings of 2004 IEEE Fall Vehicular Technology Conference (VTC 2004 Fall), vol. 7, pp. 4645-4649, Los Angels, CA, Septermber 2004.

• K. Ishibashi, H. Ochiai, and R. Kohno, "On the performance of bit-interleaved coded DAPSK over Rayleigh fading channels," in Proceedings of 2004 IEEE International Conference on Communications (ICC 2004), pp. 732-736, Paris, France, June 2004.

• H. Ochiai, "Performance of optimal and suboptimal detection for uncoded OFDM systems with deliberate clipping and filtering," in Proceedings of 2003 IEEE Global Telecommunications Conference (GLOBECOM 2003), pp. 1618-1622, San Francisco, CA, December, 2003.

• A. Ishii, H. Ochiai, and T. Fujino, "Multiple-symbol differential detection for OFDM over both time and frequency-selective Rayleigh fading channels," in Proceedings of The Sixth International Symposium on Wireless Personal Multimedia Communications (WPMC '03), Yokosuka, Japan, October 2003.

• H. Ochiai, "Trellis shaped coded OFDM systems with high power efficiency," in Proceedings of 2003 IEEE International Symposium on Information Theory (ISIT '03), p. 6, Yokohama, Japan, June 2003.

• H. Ochiai, "A new trellis shaping design for OFDM," in Proceedings of The Fifth International Symposium on Wireless Personal Multimedia Communications (WPMC '02), pp. 1019-1023, Honolulu, HI, October 2002.

• H. Ochiai, "Power efficiency comparison of OFDM and single-carrier signals," in Proceedings of 2002 IEEE Fall Vehicular Technology Conference (VTC '02 Fall), pp. 899-903, Vancouver, B.C., Canada, Septermber 2002.

• H. Ochiai and H. Imai, "On clipping for peak-power reduction of OFDM signals," in Proceedings of 2000 IEEE Global Telecommunications Conference (GLOBECOM 2000), pp. 731-735, San Francisco, CA, November 2000.

• H. Ochiai and H. Imai, "Performance analysis of downlink multi-carrier CDMA with maximum-likelihood detection," in Proceedings of 2000 International Symposium on Information Theory and its Application (ISITA '00) , pp. 748-751, Honolulu, HI, November 2000.

• H. Ochiai and H. Imai, "Channel capacity of clipped OFDM systems," in Proceedings of 2000 IEEE International Symposium on Information Theory (ISIT '00), p. 219, Sorrento, Italy, June 2000.

• T. Minowa, H. Ochiai, and H. Imai, "Phase noise effect on turbo-coded modulation over the coherent M-ary channel," in Proceedings of 2000 IEEE Vehicular Technology Conference (VTC '00 Spring), pp. 2232-2236, Tokyo, May 2000.

• H. Ochiai and H. Imai, "On the deliberately clipped and strictly bandlimited OFDM systems," in Proceedings of The Second International Symposium on Wireless Personal Multimedia Communications (WPMC '99), pp.251-256, Amsterdam, The Netherlands, September 1999.

• H. Ochiai and H. Imai, "Performance of downlink MC-CDMA with simple interference cancellation," presented at 1999 Second International Workshop on Multi-Carrier Spread Spectrum (MC-SS'99) & Related Topics, DLR, Oberpfaffenhofen, Germany, September 1999; published in Multi-Carrier Spread-Spectrum & Related Topics , K.Fazel and S. Kaiser (Editors), Kluwer Academic Publishers, pp. 211-218, 1999.

• H. Ochiai and H. Imai, "Peak-power reduction schemes in OFDM systems: A review," in Proceedings of The First International Symposium on Wireless Personal Multimedia Communications (WPMC '98), pp.247-252, Yokosuka Research Park (YRP), November 1998.

• H. Ochiai and H. Imai, "Block codes for frequency diversity and peak power reduction in multicarrier systems," in Proceedings of 1998 IEEE International Symposium on Information Theory (ISIT '98) , p.192, Cambridge, MA, August 1998.

• H. Ochiai and H. Imai, "OFDM-CDMA with peak power reduction based on the spreading sequences," in Proceedings of 1998 IEEE International Conference on Communications (ICC '98) , pp.1299-1303, Atlanta, GA, June 1998.

• H. Ochiai and H. Imai, "Performance of block codes with peak power reduction for indoor multicarrier systems," in Proceedings of 1998 IEEE 48th Vehicular Technology Conference (VTC '98) , pp. 338-342, Ottawa, Canada, May 1998.

• H. Ochiai and H. Imai, "Forward error correction with reduction of peak to average power ratio of QPSK multicarrier signals," in Proceedings of 1997 IEEE International Symposium on Information Theory (ISIT '97), p. 120, Ulm, Germany, June 1997.

• H. Ochiai and H. Imai, "On the performance of asynchronous multi-carrier CDMA," presented at 1997 First International Workshop on Multi-Carrier Spread Spectrum (MC-SS'97), DLR, Oberpfaffenhofen, Germany, April 1997; published in Multi-Carrier Spread-Spectrum , K.Fazel and G.P.Fettweis (Editors), Kluwer Academic Publishers, pp.227-234, 1997.

Book Chapters

• H. Ochiai and H. Imai, "Collaborative beamforming," in New Directions in Wireless Communications Research, V. Tarokh (Editor), Springer, 2009.

• H. Ochiai, P. Mitran, H. V. Poor, and V. Tarokh, "Random array theory and collaborative beamforming," in Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, C. Sun, J. Cheng, and T. Ohira (Editors), Information Science Reference, July 2008.

• O. -S. Shin, N. Devroye, P. Mitran, H. Ochiai, S. S. Ghassemzadeh, H. T. Kung and V. Tarokh, "Cooperation, competition and cognition in wireless networks," in Cooperation in Wireless Networks: Principles and Applications, F. H. P. Fitzek and M. D. Katz (Editors), Springer, 2006.

Disseration