Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Reexamination Certificate
2007-11-27
2007-11-27
Tsang, Fan (Department: 2614)
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
C455S063100, C455S452100, C455S562100, C370S317000
Reexamination Certificate
active
09941399
ABSTRACT:
An adaptive antenna control method is used for a radio communication system built by a plurality of radio base stations and a plurality of terminal stations capable of communicating with the radio base stations. Each radio base station includes an adaptive antenna having a plurality of antenna elements, a distributor for generating signals to be input to the plurality of antenna elements by branching a signal of one system to be transmitted, and weighting circuits for respectively weighting transmission signals to the plurality of antenna elements. For reception by each terminal station, an interference wave power given by the transmission signal from each of the plurality of radio base stations is estimated. A weight in the adaptive antenna of each radio base station is determined to minimize a sum of square errors between reception signals and desired signals for all the radio base stations which simultaneously use the same communication channel. An adaptive antenna transmission/reception characteristic control method is also disclosed.
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Cho Keizo
Hori Toshikazu
Nishimori Kentaro
Takatori Yasushi
Blakely & Sokoloff, Taylor & Zafman
Hashem Lisa
Nippon Telegraph and Telephone Corporation
Tsang Fan
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