| US 7,593,317 B2 | ||
| Radio base station apparatus | ||
| Yasuaki Yuda, Yokohama (Japan); Takaaki Kishigami, Ota-ku (Japan); Takashi Fukagawa, Kawasaki (Japan); Keiji Takakusaki, Yokohama (Japan); and Shoji Miyamoto, Sendai (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/503,010 PCT Filed Aug. 01, 2003, PCT No. PCT/JP03/09793 § 371(c)(1), (2), (4) Date Jul. 29, 2004, PCT Pub. No. WO2004/013993, PCT Pub. Date Feb. 12, 2004. |
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| Claims priority of application No. 2002-224571 (JP), filed on Aug. 01, 2002. | ||
| Prior Publication US 2005/0018597 A1, Jan. 27, 2005 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—208 | 24 Claims |
| 1. A radio base-station apparatus comprising:
a transmission weight computing section for computing transmission weights for directional transmission using an OFDM signal,
the OFDM signal comprising a plurality of sub-carriers;
a transmission correcting value memory section for storing one correcting value for correcting the transmission weight for
each of the plurality of sub-carriers;
a transmitting weight correcting section for correcting the transmission weight for each of the plurality of sub-carriers
with the correcting value; and
a plurality of transmitting branches, each of the transmitting branches for weighting transmission data with the corrected
transmission weight outputted from the transmission weight correcting section on a sub-carrier-by-sub-carrier basis and for
providing the weighted transmission data to an antenna element, the correcting value is used to correct a frequency characteristic
of amplitude deviations and phase deviations between transmitting branches, and
wherein the correcting value is determined separately for each individual transmitting branch based on respective amplitude
deviation and respective phase deviation of the transmission data within each individual transmitting branch.
|