| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of the radio receiver employing the spatial division multiplex system by demultiplexing received signals in every incoming direction, based on a signal resulting from A/D-conversion a sum signal based on a signal synchronously with a period of orthogonal signals from an orthogonal signal generating means. SOLUTION: A received signal by antenna x1-x4 is given to weighting circuits 5-8 via frequency selection means 1-4 that select a desired frequency band signal. An antenna control signal generating means 10 receives weighted vectors Wa-Wc, which are used to make antenna beams coincide with each of received signals a-c received from different directions and direct a null point in an incoming direction of the other signals, modulate orthogonal signals Ca-Cc from an orthogonal signal generating means 19, outputs antenna control signals W1-W4 to the weighting circuits 5-8, where the received signals are weighted by the antenna control signals W1-W4. A signal combining means 15 combines the weighted signals, the sum signal is via an analog signal processing means 16 and an A/D converter 17 to an orthogonal signal demultiplexer means 18, where the orthogonal signals from the orthogonal signal generating means 19 via a delay circuit 20 are multiplied with the sum signal to extract low-frequency components and to demultiplex the received signals a-c in each arrived direction.
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