CDMA communications system adaptive to mobile unit speed
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-001/69
H04B-001/707
출원번호
US-0253094
(1999-02-22)
발명자
/ 주소
Jin, Xin
출원인 / 주소
Nortel Networks Limited
인용정보
피인용 횟수 :
47인용 특허 :
14
초록▼
The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located in the mobile unit itself and/or in the base station. The speed estimate is used to modify a variety of
The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located in the mobile unit itself and/or in the base station. The speed estimate is used to modify a variety of parameters within processing fingers in the mobile unit and in the base station, including the accumulation period of certain accumulators and the time constant for loop filters. The speed estimate also influences assignment, by a control unit, of path delays to respective processing fingers for despreading. Furthermore, the speed estimate is used by the control unit to decide whether or not finger outputs are to be combined by a diversity combiner in the receiver. In addition, the speed estimate is used to optimize the closed-loop power control target and the energy of a transmitted pilot. The speed estimate is also used for allocation of pooled finger and searcher resources, as well as data transmission rate negotiation and interleaver/deinterleaver length configuration.
대표청구항▼
The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located in the mobile unit itself and/or in the base station. The speed estimate is used to modify a variety of
The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located in the mobile unit itself and/or in the base station. The speed estimate is used to modify a variety of parameters within processing fingers in the mobile unit and in the base station, including the accumulation period of certain accumulators and the time constant for loop filters. The speed estimate also influences assignment, by a control unit, of path delays to respective processing fingers for despreading. Furthermore, the speed estimate is used by the control unit to decide whether or not finger outputs are to be combined by a diversity combiner in the receiver. In addition, the speed estimate is used to optimize the closed-loop power control target and the energy of a transmitted pilot. The speed estimate is also used for allocation of pooled finger and searcher resources, as well as data transmission rate negotiation and interleaver/deinterleaver length configuration. l., 331/016; US-5796392, 19980800, Eglit, 345/213; US-5831483, 19981100, Fukuda, 331/019; US-5867524, 19990200, Booth et al., 375/130; US-5872807, 19990200, Booth et al., 375/130; US-5889819, 19990300, Arnett, 375/270; US-5909144, 19990600, Puckette et al., 327/551; US-5909472, 19990600, Arnett, 375/362; US-5940428, 19990800, Ishiguro et al., 375/150; US-5943382, 19990800, Li et al., 375/376; US-5963604, 19991000, Greiss, 375/355; US-6006008, 19991200, Klaffenbach et al., 388/813; US-6014063, 20000100, Liu et al., 331/078; US-6020939, 20000200, Rindal et al., 348/805; US-6046646, 20000400, Lo et al., 331/010; US-6046735, 20000400, Bassetti et al., 345/204; US-6114915, 20000900, Huang et al., 331/025; US-6133770, 20001000, Hasegawa, 327/156; US-6144242, 20001100, Jeong et al., 327/269; US-6147699, 20001100, Berry et al., 347/255; US-6167103, 20001200, Hardin, 375/376; US-6175259, 20010100, Mann et al., 327/159; US-6198353, 20010300, Janesch et al., 331/016; US-6240123, 20010500, Zhang et al.; US-6292507, 20010900, Hardin et al., 375/130
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이 특허에 인용된 특허 (14)
Kubo Tokuro,JPX ; Minowa Morihiko,JPX, Apparatus and method for estimating speed in mobile communication.
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Zehavi Ephraim (5365 Toscana Way San Diego CA 92122), Method and apparatus for variable rate signal transmission in a spread spectrum communication system using coset coding.
Blakeney ; II Robert D. (San Diego CA) Karmi Gadi (San Diego CA) Tiedemann ; Jr. Edward G. (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA), Mobile station assisted soft handoff in a CDMA cellular communications system.
Huff Duane L. (Annandale NJ), System and method for determining whether to assign a macrocell or microcell communication frequency to a mobile communi.
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Wheatley ; III Charles E. (Del Mar CA) Viterbi Andrew J. (La Jol, System and method for generating signal waveforms in a CDMA cellular telephone system.
Kim,Hung Kee; Lee,Yong Suk; Kim,Sung Jin; Lee,Kang Min; Moon,Yong Suk; Kim,Noh Sun, Adaptive transmit antenna diversity apparatus and method in a mobile communication system.
Hastings, III, William A.; Horn, James, Common wave and sideband mitigation communication systems and methods for increasing communication speeds, spectral efficiency and enabling other benefits.
Bilgic,Attila; Bottero,Mauro; Canonici,Jean Xavier; Zimmermann,Manfred, Determination and selection of transmission paths as a function of the operating situation for setting up rake fingers for rake receiver units in mobile communication terminals.
Poloni, Angelo; Silva, Filippo; Valle, Stefano, Method and apparatus for channel estimation of transmission channels with memory in digital telecommunications systems, and corresponding computer-program product.
Anim Appiah,Kofi D.; Williams,Richard G. C.; Batra,Anuj, Method and apparatus for channel quality metric generation within a packet-based multicarrier modulation communication system.
Ling, Fuyun; Black, Peter J., Method and apparatus for determining the closed loop power control set point in a wireless packet data communication system.
Ling,Fuyun; Black,Peter J., Method and apparatus for determining the closed loop power control set point in a wireless packet data communication system.
Chen, Jiangnan Jason; Wang, Fan, Method and apparatus for providing channel quality feedback in an orthogonal frequency division multiplexing communication system.
Khayrallah, Ali S.; Bottomley, Gregory E.; Eriksson, H{dot over (a)}kan B.; Cozzo, Carmela, Method and apparatus for rake finger allocation in a DS-CDMA receiver.
Hastings, III, William A.; Horn, James, Receiver for sideband mitigation communication systems and methods for increasing communication speeds, spectral efficiency and enabling other benefits.
Hastings, III, William A.; Horn, James, Sideband mitigation communication systems and methods for increasing communication speeds, spectral efficiency and enabling other benefits.
McDonough,John G.; Jeong,Gibong; Abdulla,Karim; Nambiar,Rajiv R.; Clark, Jr.,William S., System and method for intelligent processing of results from search of direct sequence spread spectrum (DSSS) signals.
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