Sanyo Electric Co., Ltd.

Hokkaido University

Toshihiko Nishimura

Yasutaka Ogawa

Takeo Ohgane

Yoshiharu Doi

Jun Kitakado

Masashi Iwami

Seigo Nakao

Hiroshi Nishimoto

When once determined to be free of any demodulation error by an interference removing unit provided user by user, a replica signal calculated by the interference removing unit is subtracted from an input signal vector, and a calculated user signal is output as it is as a final user signal. When it is determined by the interference removing unit that there is a demodulation error, the user signal is again calculated by the interference removing unit of an interference canceller of a next stage. As subtraction of the replica signal corresponding to the user signal having a demodulation error from the input signal vector is inhibited, precision of the interference wave removal can be improved.

Radio reception system

A plurality of antennas transmit multicarrier signals composed of a plurality of streams. An IF unit acquires, per carrier, a channel matrix having elements the number of which is determined by the number of a plurality of transmitting antennas and the number of a plurality of receiving antennas provided in a receiving apparatus. A baseband processing unit derives a common autocorrelation matrix for the channel matrix acquired per carrier. The baseband processing unit derives a steering matrix by eigenvalue-decomposing the derived common autocorrelation matrix. The baseband processing unit derives, per carrier, weight vectors for a plurality of streams in a manner such that an orthonormalization is performed respectively on matrices obtained by operating the derived steering matrix on the channel matrix per carrier.

Method for deriving weight vectors to be used at the time of transmitting signals from a plurality of antennas, and transmitting apparatus and communication system utilizing said method

Radio receiving system

Growing community of inventors

Sapporo, Japan

Toshihiko Nishimura