Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2001-04-17
2008-08-19
Pham, Chi H. (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S516000, C375S226000, C375S299000
Reexamination Certificate
active
07414962
ABSTRACT:
In an OFDM transmission a transmission diversity technique is used without orthogonal signaling. The phases of the subcarriers received at the different antennas are compared by different techniques and then the phases of the signals for different antennas are adjusted for a subsequent transmission over the OFDM interface. The phase (and optionally amplitude) adjustment is calculated in only one (transmitting) side and no orthogonal signaling required. The number of antennas can be increased as much as necessary to get a sharper beam. The negative effects of fading and interference can be reduced so that at same time a down link transmission power can be reduced.
REFERENCES:
patent: 5561673 (1996-10-01), Takai et al.
patent: 5867478 (1999-02-01), Baum et al.
patent: 5970397 (1999-10-01), Klank et al.
patent: 5973642 (1999-10-01), Li et al.
patent: 6070056 (2000-05-01), Sakoda et al.
patent: 6111919 (2000-08-01), Yonge, III
patent: 6131016 (2000-10-01), Greenstein et al.
patent: 6134261 (2000-10-01), Ryan
patent: 6618352 (2003-09-01), Shirakata et al.
patent: 6700865 (2004-03-01), Yamamoto et al.
patent: 6763225 (2004-07-01), Farmine et al.
patent: 6807145 (2004-10-01), Weerackody et al.
patent: 2002/0154705 (2002-10-01), Walton et al.
patent: 0 823 804 (1998-02-01), None
patent: 0 881 782 (1998-12-01), None
Takahashi H et al: “Antenna and Multi-Carrier Combined Diversity System” IEICE Transactions on Communications, JP, Institute of Electronics Information and Comm. Eng. Tokyo, vol. E79B, No. 9, Sep. 1, 1996, pp. 1221-1226, XP000636058.
Hyun Soon D
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Pham Chi H.
Sony Deutschland GmbH
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