Sharp Kabushiki Kaisha Corporation

Waseda University

Fumio Takahata

Hiromichi Tomeba

Minoru Kubota

Takashi Onodera

Fumiaki Maehara

It is intended to provide a transmission device, a reception device and a communication system capable of improving transmission characteristics by performing packet combining by HARQ in MU-MIMO transmission using non-linear precoding. In a case of receiving NAK from any of terminal devices (), a base station device () retransmits a packet, in which an error occurs, addressed to this terminal device. The base station device () transmits the data to be retransmitted together with other transmission data addressed to a different terminal device or addressed to the own terminal device by spatial multiplexing transmission with MU-MIMO. At this time, for the retransmission data, precoding is performed such that a perturbation term same as a perturbation term which has been added to this data by non-linear precoding at the time of initial transmission is added.

Transmission device that performs multi-user MIMO transmission for performing spatial multiplexing and transmitting of a plurality of packets addressed to a plurality of reception devices

Growing community of inventors

Shinjuku, Japan

Fumio Takahata