Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2008-05-27
2008-05-27
Trost, William (Department: 2617)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063400, C455S103000, C455S112000
Reexamination Certificate
active
11354792
ABSTRACT:
A MIMO wireless communication system and wireless communication apparatuses are disclosed that increase the practically usable communication channel capacity in the Shannon channel capacity that determines the ratio of maximum signal transmission speed to frequency. Each wireless communication apparatus includes antenna units that transmit and receive radio frequency signals, and a weight controlling unit that provides weights with respect to the antenna units. The antenna units are formed by adaptive array antenna units that can change the directivity by varying weights with respect to antenna elements. The weight controlling unit includes an eigenvalue calculating unit that calculates the eigenvalues of a matrix HH* (H being a channel matrix), an inverse calculation unit that calculates such a channel matrix H′ as to have all eigenvalues within a predetermined range that includes the average value of the calculated eigenvalues, and a directivity adjusting unit that adjusts the adaptive array antenna directivity so that the current channel matrix H approaches the calculated channel matrix H′.
REFERENCES:
patent: 6128276 (2000-10-01), Agee
patent: 6184828 (2001-02-01), Shoki
patent: 6462709 (2002-10-01), Choi
patent: 6593882 (2003-07-01), Kim et al.
patent: 6765898 (2004-07-01), Bloch
patent: 2003/0003880 (2003-01-01), Ling et al.
patent: 2003/0069047 (2003-04-01), Kitahara
patent: 2003/0181170 (2003-09-01), Sim
patent: 2004/0125036 (2004-07-01), Chiang et al.
patent: 2003-060604 (2003-02-01), None
I.E. Telatar. Capacity of Multi-Antenna Gaussian Channels. Bell Labs. Technical Memorandum, 1995, pp. 1-28.
G.J. Foschini et al. On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas. Wireless Personal Commun. vol. 6, No. 3 pp. 311-335, Mar. 1998.
G.J. Foschini. Layered Space-Time Architecture for Wireless Communication in a Fading Environment When Using Multi-Element Antennas. Bell Syst. Tech. J., vol. 1, No. 2 pp. 41-59, 1996.
J.B. Andersen. Array Gain and Capacity for known random channels with multiple element arrays at both ends. IEEE J. Sel. Areas in Commun., vol. 18, No. 11, pp. 2172-2178, Nov. 2000.
European Search Report dated Apr. 7, 2006.
Nakaya Yuuta
Oishi Yasuyuki
Toda Takeshi
Yokoo Kaoru
Fujitsu Limited
Holliday Jaime
Katten Muchin & Rosenman LLP
Trost William
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