Inventor · disambiguated record
Akihisa Ushirokawa
Also filed as: USHIROKAWA AKIHISA
43 granted patents·10 pending applications·1,618 citations·filing 1991–2012
99Inventor score
Top patents by PatentIndex Score
53 records- 0194US5734647ACDMA communication system in which interference removing capability is improvedNEC·Filed 1995·Granted Mar 31, 1998·125 cites·21 claims
- 0292US5325402AMethod and arrangement for estimating data sequences transmsitted using Viterbi algorithmNEC CORP·Filed 1992·Granted Jun 28, 1994·211 cites·4 claims
- 0389US7139284B1Spread code allocation method and base station in CDMA cellularNEC CORP·Filed 2000·Granted Nov 21, 2006·29 cites·32 claims
- 0487US5323422AAdaptive receiver apparatusNEC CORP·Filed 1992·Granted Jun 21, 1994·44 cites·11 claims
- 0585US5930229AInterference canceller for CDMANEC CORP·Filed 1997·Granted Jul 27, 1999·83 cites·4 claims
- 0683US6509872B2Adaptive antenna receiving apparatusNEC CORP·Filed 2001·Granted Jan 21, 2003·24 cites·18 claims
- 0783US6205166B1CDMA receiver with antenna array adaptively controlled with combined errors of despread multipath componentsNEC CORP·Filed 1998·Granted Mar 20, 2001·75 cites·15 claims
- 0882US7940811B2Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2006·Granted May 10, 2011·5 cites·22 claims
- 0981US6208683B1Receiving apparatus for use in CDMA type mobile radio communication system comprising a plurality of path receivers each including a follow-up path detection unitNEC CORP·Filed 1998·Granted Mar 27, 2001·68 cites·9 claims
- 1080US5886987AFDD/CDMA transmission/reception systemNEC CORP·Filed 1996·Granted Mar 23, 1999·68 cites·15 claims
- 1180US5646964ADS/CDMA receiver for high-speed fading environmentNEC CORP·Filed 1994·Granted Jul 8, 1997·85 cites·42 claims
- 1277US5621764ASoft decision signal outputting receiverNEC CORP·Filed 1995·Granted Apr 15, 1997·104 cites·30 claims
- 1376US5444721AMaximum likelihood sequence estimation apparatusNEC CORP·Filed 1992·Granted Aug 22, 1995·24 cites·4 claims
- 1475US6714584B1CDMA adaptive antenna receiving apparatus and communication systemNEC CORP·Filed 1999·Granted Mar 30, 2004·49 cites·22 claims
- 1573US5687162ADS/CDMA receiver having an interference cancelling function capable of asssuring a desired reception quality in a narrow-band DS/CDMANEC CORP·Filed 1995·Granted Nov 11, 1997·47 cites·14 claims
- 1671US7257408B2Radio communication system and transmission mode selecting methodNEC CORP·Filed 2004·Granted Aug 14, 2007·16 cites·17 claims
- 1769US7203208B2Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2003·Granted Apr 10, 2007·7 cites·80 claims
- 1869US5644603AMaximum-likelihood sequence estimator with variable number of statesNEC CORP·Filed 1995·Granted Jul 1, 1997·66 cites·20 claims
- 1967US6418320B2Mobile station and a method of reducing interference among radio channels in the mobile stationNEC CORP·Filed 1998·Granted Jul 9, 2002·55 cites·27 claims
- 2067US6081516AMultiuser receiving device for use in a CDMA systemNEC CORP·Filed 1997·Granted Jun 27, 2000·36 cites·13 claims
- 2161US6359864B1FDD/CDMA transmission/reception systemNEC CORP·Filed 1998·Granted Mar 19, 2002·20 cites·4 claims
- 2260US8098743B2Pilot signal transmission method and radio communication system for enabling measurement of reception quality with high accuracyKURODA NAHOKO·Filed 2005·Granted Jan 17, 2012·2 cites·11 claims
- 2360US6222498B1CDMA multiuser receiver featuring a combination of array antenna and multiuser cancelersNEC CORP·Filed 1999·Granted Apr 24, 2001·43 cites·4 claims
- 2459US6373881B1CDMA receiver using sampled chip sequence for precision synchronization with received data sequenceNEC CORP·Filed 1998·Granted Apr 16, 2002·26 cites·9 claims
- 2558US7324470B2FDD/CDMA receiver having transmission antenna control circuitNEC CORP·Filed 2001·Granted Jan 29, 2008·3 cites·14 claims
- 2658US7154915B1Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 1999·Granted Dec 26, 2006·20 cites·29 claims
- 2758US5363411ALow power consumption receiver with adaptive equalizerNEC CORP·Filed 1992·Granted Nov 8, 1994·32 cites·7 claims
- 2858US5228058AAdaptive equalizerNEC CORP·Filed 1991·Granted Jul 13, 1993·31 cites·3 claims
- 2957US7039099B2Demodulation apparatus and demodulation method for mobile communicationNEC CORP·Filed 2001·Granted May 2, 2006·4 cites·29 claims
- 3057US6856608B1Method and base station for allocating pseudo noise codeNEC CORP·Filed 2000·Granted Feb 15, 2005·3 cites·41 claims
- 3157US6665286B1Adaptive receiving device removing interference from users and multi-paths by antenna directivity controlNEC CORP·Filed 1999·Granted Dec 16, 2003·24 cites·14 claims
- 3257US5519727AAdaptive equalizerNEC CORP·Filed 1993·Granted May 21, 1996·31 cites·14 claims
- 3356US7417975B2Cellular system and base station specification method in CDMA modeNEC CORP·Filed 2002·Granted Aug 26, 2008·4 cites·21 claims
- 3455US7944950B2Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2006·Granted May 17, 2011·0 cites·11 claims
- 3554US5701333ADiversity receiver in which reception characteristics can be improvedNEC CORP·Filed 1995·Granted Dec 23, 1997·33 cites·12 claims
- 3653US5448761AChannel assignment in a cellular mobile radio network with a CIR threshold level selected in dependency on priority degrees of channels used in the networkNEC CORP·Filed 1993·Granted Sep 5, 1995·41 cites·6 claims
- 3753US2011243028A1Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2011·Application pending·0 cites
- 3853US2011176533A1Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2011·Application pending·0 cites
- 3953US2011243049A1Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2011·Application pending·0 cites
- 4053US2011176470A1Mobile communication system, communication control method, and base station and mobile station to be employed in the sameNEC CORP·Filed 2011·Application pending·0 cites
- 4151US7830829B2FDD/CDMA transmission/reception systemNEC CORP·Filed 2006·Granted Nov 9, 2010·0 cites·24 claims
- 4251US5272726ABlind type sequence estimator for use in communications systemNEC CORP·Filed 1991·Granted Dec 21, 1993·22 cites·9 claims
- 4346US6487174B1S/N measuring circuit and method, transmitting electric power control apparatus and digital communicating systemNEC CORP·Filed 1998·Granted Nov 26, 2002·16 cites·3 claims
- 4445US2003137957A1Radio transmitting and receiving device and radio communication systemNEC CORP·Filed 2003·Application pending·0 cites
- 4545US2007297381A1Band allocation method and radio communication systemNEC CORP·Filed 2007·Application pending·0 cites
- 4644US5450445AMethod and arrangement of estimating data sequences transmitted using viterbi algorithmNEC CORP·Filed 1992·Granted Sep 12, 1995·14 cites·4 claims
- 4744US2003096579A1Wireless communication systemNEC CORP·Filed 2002·Application pending·0 cites
- 4842US2001014607A1Mobile communications system and connection control methodNEC CORP·Filed 2000·Application pending·0 cites
- 4940US5528627ASignal reception system comprising an adaptive filterNEC CORP·Filed 1995·Granted Jun 18, 1996·11 cites·5 claims
- 5038US2007010209A1Communication control method and communication system for preventing deterioration in communication characteristics caused by failureNEC CORP·Filed 2006·Application pending·0 cites
Showing the top 50 of 53 patent records by PatentIndex Score.
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