Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-04-19
2011-04-19
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S262000
Reexamination Certificate
active
07929592
ABSTRACT:
A channel estimation value of data symbols of a data channel is calculated by weighting and averaging pilot symbols in a parallel time multiplexing method. Also, a channel estimation value of data symbols during each data symbol interval is calculated by dividing data symbols in a slot into a plurality of data symbol intervals, selecting pilot symbols suitable for calculation of a channel estimation value of data symbols during each data symbol interval and weighting and averaging that pilot symbols. Also, a fading frequency is detected based on an inner product value of pilot symbols. Weighting factors are changed based on the detected fading frequency. Also, a channel estimation value is calculated by weighting and averaging pilot signals using a plurality of weighting sequences. The calculated channel estimation value is used to demodulate received data.
REFERENCES:
patent: 5519730 (1996-05-01), Jasper et al.
patent: 5666352 (1997-09-01), Ohgoshi et al.
patent: 5737327 (1998-04-01), Ling et al.
patent: 5768307 (1998-06-01), Schramm et al.
patent: 5881056 (1999-03-01), Huang et al.
patent: 5982327 (1999-11-01), Vook et al.
patent: 5999560 (1999-12-01), Ono
patent: 6070086 (2000-05-01), Dobrica
patent: 6219559 (2001-04-01), Hill et al.
patent: 6272167 (2001-08-01), Ono
patent: 6295311 (2001-09-01), Sun
patent: 6304624 (2001-10-01), Seki et al.
patent: 6381229 (2002-04-01), Narvinger et al.
patent: 6483821 (2002-11-01), Dabak et al.
patent: 6487236 (2002-11-01), Iwamatsu et al.
patent: 6519300 (2003-02-01), Ramesh
patent: 6647003 (2003-11-01), Abeta et al.
patent: 6700919 (2004-03-01), Papasakellariou
patent: 6892053 (2005-05-01), Engstrom
patent: 6977910 (2005-12-01), Hosur et al.
patent: 0 715 440 (1996-06-01), None
patent: 0776105 (1996-06-01), None
patent: 0963071 (1997-05-01), None
patent: 0963056 (1999-01-01), None
patent: 0955741 (1999-11-01), None
patent: 04-070149 (1992-03-01), None
patent: 07-162360 (1995-06-01), None
patent: 07-162361 (1995-06-01), None
patent: 08-265184 (1996-10-01), None
patent: 09008770 (1997-01-01), None
patent: 09008770 (1997-01-01), None
patent: 09-298489 (1997-11-01), None
patent: 10051424 (1998-02-01), None
patent: 10051424 (1998-02-01), None
patent: 10-190625 (1998-07-01), None
patent: 11-068698 (1999-03-01), None
patent: 11186990 (1999-07-01), None
patent: 11186990 (1999-07-01), None
patent: 11-284600 (1999-10-01), None
patent: 11284600 (1999-10-01), None
patent: 11284990 (1999-10-01), None
patent: 2000-049662 (2000-02-01), None
patent: 200059267 (2000-02-01), None
patent: WO98/47246 (1998-10-01), None
patent: WO99/27672 (1999-06-01), None
patent: WO 99/27672 (1999-06-01), None
patent: WO 99/31835 (1999-06-01), None
patent: WO 99/55033 (1999-10-01), None
Sadayuki Abeta, et 2., “Performance Comparison between Time-Multiplexed Pilot Channel and Parallel Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio”. IEICE Tranaction Communication, vol. E81-B. No. 7. pp. 1417-1425, Jul. 1998.
Hidehiro Andoh, et a1., “Channel Estimation Filter Using Time-Multiplexed Pilot Channel for Coherent RAKE Combining of DS-CDMA Mobile Radio”,IEICE Trans. Commun., vol. E81-B, No. 7, pp. 1517-1526, Jul. 1998.
Andoh, H. Sawahashi, M. Adachi, F.; R&D Dept, NTT Mobile Commun. Network, Kanagawa , Japan; vol. 3; Sep. 1997; pp. 954-958; Personal, Indoor and Mobile Radio Communications; The 8th IEEE International Symposium on Publication.
Office Action for Japanese Patent Application No. 2005-336044 dated Jan. 27, 2009 (10 pages).
Official Notice of Rejection: Case No. DCMH150269, Patent Application No. 2003-277907, Nov. 29, 2005.
B-5-3 W-CDMA An Application of a Demodulation Scheme Using Parallel Channel Estimators in W-CDMA Systems Masafumi Usuda, et al. p. 238, (Aug. 1996).
Channel Estimation based on Time-Multiplexed Pilot Symbols Yoshi Honda, et al. p. 31-35 (Aug. 1996).
Official Notice of Rejection Patent Application No. 2003-277907 Case No. DCMH150269, Sep. 1, 2005.
Official Notice of Rejection Patent Application No. 2003-277908 Case No. DCMH150270, Sep. 14, 2005.
Evaluation of the Radio Channel Estimation Based on the Least Squares Method Yashuharu Amezawa, Shinishi Sato, and Takao Suzuki, 1994.
Experiments on Pilot Symbol-Assisted Coherent Rake Receiver for W-CDMA Mobile Radio H. Andoh, K. Higuchi, K. Okawa, M. Sawahashi, and F. Adachi p. 59-65(Apr. 1998).
Official Notice of Rejection Patent Application No. 2003-277907 Case No. DCMH150269, Jun. 2, 2005.
Official Notice of Rejection Patent Application No. 2003-277908 Case No. DCMH150270, Jun. 3, 2005.
Channel Estimation Filter Using Time-Multiplexed Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio Hidehiro Andoh, Mamoru Sawahashi, and Fumiyuki Adachi Jul. 1998.
DS-CDMA; The Performance of Channel Estimation Method Using Adaptive Weighted Multi-Symbol Averaging (WMSA) with Pilot Channel in DS-CDMA Sadayuki Abeta, Mamoru Sawahashi, Fumiyuki Adachi NTT Mobile Communication Network Inc. p. 67 to 79, Apr. 1998.
Seiichi Sampei and Terumi Sunaga, “Rayleigh Fading Compensation For QAM In Land Mobile Radio Communications,” IEEE Trans. Vehicular Technol., vol. 42, No. 2, pp. 137-147, May 1993.
Seiichi Sampei, “Rayleigh Fading Compensation Method for 16 QAM Modem In Digital Land Mobile Radio Systems,” IEICE (Sect. B-II), vol. J72-B-II, No. 1, pp. 7-15, Jan. 1989.
Hidehiro Andoh, et al., “Channel Estimation Filter Using Time-Multiplexed Pilot Channel for Coherent RAKE Combining in DS-CDMA Mobile Radio,” IEICE Trans. Commun., vol. E81-B, No. 7, pp. 1517-1526, Jul. 1998.
H. Andoh, et al., “Performance of Pilot Symbols-Assisted Coherent RAKE Receiver Using Weighted Multi-Slot Averaging for DS-CDMA Mobile Radio,” Technical Report of IEICE. RCS97-74, pp. 63-68, Jul. 1997.
Sadayuki Abeta, et al., “Performance Comparison Between Time-Multiplexed Pilot Channel and Parallel Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio,” IEICE Trans. Commun., vol. E81-B, No. 7, pp. 1417-1425, Jul. 1998.
Sadayuki Abeta, et al., “The Performance of Channel Estimation Method Using Weighted Multi-Symbol Averaging (WMSA) with Pilot Channel in DS-CDMA,” Technical Report of IEICE. RCS97-163, pp. 43-50, Nov. 1997.
Sadayuki Abeta, et al., “DS/CDMA Coherent Detection System with a Suppressed Pilot Channel,” IEEE GLOBECOM '94, pp. 1622-1626, 1994; vol. 3; Nov. 28-Dec. 2, 1994.
Sadayuki Abeta, et al., “A Coherent Detection System With A Suppressed Pilot Channel for DS/CDMA Systems,” IEICE (Sect. B-II), vol. J77-B-II, No. 11, pp. 641-648, Nov. 1994.
Sadayuki Abeta, et al., “Adaptive Channel Estimation for Coherent DS-CDMA Mobile Radio Using Time-Multiplexed Pilot and Parallel Pilot Structures,” IEICE Trans. Commun., vol. E82-B, No. 9, pp. 1505-1513, Sep. 1999.
Sadayuki Abeta et al., “The Performance of Channel Estimation Method Using Adaptive Weighted Multi-Symbol Averaging (WMSA) with Pilot Channel in DS-CDMA,” Technical Report of IEICE. SSE98-20 (RCS98-20) pp. 67-74, Apr. 1998.
The Performance of Channel Estimation method using Adaptive Weighted Multi-Symbol Averaging (WMSA) with Pilot Channel in DS-CDMA; Sadayuki Abeta, Mamoru Sawahashi, Fumiyuki Adachi, (Apr. 1998); p. 67-74 (English translation included with article 43 pages total; attached hereto as Article 1).
Translation of Priority Documents and Declaration in Support Thereof, Translation of Japanese patent application No. 11-96804 filed Apr. 2, 1999 (copy attached hereto as Article 1).
Sadayuki Areta et al., The Performance of Channel Estimation Method using Adaptive WMSA, Technical Report of IEICE SSE98-20, RCSPC-20 (Apr. 1998).
Ando Hidehiro
Ishikawa Yoshihiro
Okumura Yukihiko
Onoe Seizo
Usuda Masafumi
Fan Chieh M
Ghulamali Qutbuddin
NTT Docomo Inc.
Workman Nydegger
LandOfFree
Channel estimation device and method, demodulation device... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Channel estimation device and method, demodulation device..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Channel estimation device and method, demodulation device... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2698003