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- D. Akopian, J. Syrjarinne, “ Method, receiver and system for determining the time of reception of a beacon signal,” US Patent 6833813, Dec. 21, 2004.
- D. Akopian, “System for acquiring spread spectrum signals,” US Patent 6,810,072, October 26, 2004
- D. Akopian, H. Valio, “Determination of the transmission time of a signal part in a positioning system,” US Patent 6,771,215, August 3, 2004 .
- D. Akopian, J. Syrjarinne, “Method for determining the correlation between a received beacon signal and a reconstructed signal,” US Patent 6,768,451, July 27, 2004 .
- D. Akopian, “Method, apparatus and system for fast acquisition of a spread spectrum signal,” US Patent 6,735,243, May 11, 2004 .
- H. Sairo, D. Akopian, J. Takala, “ Weighted dilution of precision as quality measure in satellite positioning”,Radar, Sonar and Navigation, IEE Proceedings, Vol. 150 , Issue 6, Dec. 2003, pp. 430 – 436
- D. Akopian, J. Takala, J. Saarinen, J. Astola, "Multistage interconnection networks for parallel Viterbi decoders," IEEE Transactions on Communications, Sept., 2003.
- Takala, D. Akopian, J. Astola, J. Saarinen "Constant geometry algorithm for Discrete Cosine Transform" IEEE Transactions on Signal Processing, vol. 48, No.6, June 2000.
- J. Astola and D. Akopian, "Architecture oriented regular algorithms for a class of trigonometric transforms," IEEE Transactions on Signal Processing., April 1999.
- J. Astola, D. Akopian, "Processor Architecture for threshold and extended threshold Boolean filters," IEEE Transactions, Circuits and Systems II, February 1999.
- J. Astola, D. Akopian, O. Vainio, S. Agaian, "Digit-serial architectures for stack filters," EURASIP Signal Processing Journal, in vol. 61, pp. 181-197, September 1997.
- D. Akopian, O. Vainio, S. Agaian, and J. Astola, "SBNR processor for stack filters," IEEE Transactions, Circuits and Systems II, vol. 44, pp. 197-208, Mar. 1997.
- D. Akopian, O.Vainio, S.Agaian, J.Astola, "Processors for generalized stack filters," IEEE Transactions on Signal Processing, vol. 43, no. 6, pp. 1541-1546, June, 1995.
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