Patent ID: 9282468
Filing Date: 2016-03-08
CPC Classification: H04B,H04W

Claim Text:
1. A communication device that relays data between a plurality of transmitting devices and a receiving device, comprising: a first estimation unit that estimates a state of respective communication channels between the communication device and a plurality of transmitting devices that are present in respective distinct cells and that transmit data in accordance with MIMO transmission; a reception unit that is common to the plurality of transmitting devices, and that receives data, respectively transmitted by the plurality of transmitting devices without sharing transmission data or channel state information among the respective transmitting devices, in accordance with a transmission timing in which synchronization between the transmitting devices is established, via an antenna that receives radio waves transmitted by the plurality of transmitting devices, and that separates the received data into data pieces respectively transmitted from the plurality of transmitting devices by using a reception weight determined on the basis of the state of the communication channels as estimated by the first estimation unit; and a transmission unit that determines weights, wherein transmission weighting is performed according to E-SDM (Eigenbeam-Space Division Multiplexing), and that transmits, in accordance with multi-user MIMO transmission, the separated respective data to a plurality of receiving devices present in the respective cells in which data is transmitted by the plurality of transmitting devices, wherein the weighting is performed by multiplying the data of each branch.