| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system, a device and a method, which allow parallel transmission with a low-cost constitution using analog circuits.SOLUTION: In a radio communication system, all of MIMO antennas AT1-AT4 including transmit and receive are symmetrically arranged with reference to a certain plane so as to express symmetry between channel matrices for transmit and receive. To both arrays for transmit and receive, 180-degree hybrid circuits HT, HR are connected. Depending on symmetry of the channel matrixes and input/output properties of the 180-degree hybrid couplers, the channel matrixes are diagonalized only by the analog circuits. That is, a plurality of parallel transmission channels without interference are formed regardless of digital signal processing and without performing beam forming. |
