Nippon Hoso' Kyokai

Nhk Engineering System, Inc.

Nec Corporation

Hiroaki Miyasaka

Susumu Saito

Masayuki Takada

Kazuhiko Shibuya

Kenichi Tsuchida

Akihiko Satou

Tomoaki Takeuchi

Kenichi Murayama

Masahiro Okano

Takuya Shitomi

Madoka Honda

Shingo Asakura

Yoshikazu Narikiyo

Kazuaki Takahashi

Shinichi Sudou

Yusuke Izumiya

Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter () maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver () demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver () applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.

Transmitter, receiver, and semiconductor chip

An optical disk apparatus is provided, in which the optical disk tray can slide smoothly in and out, and the insertion and removal of an optical disk is facilitated, and wherein inadvertent scratches are not produced on the optical disk surface, and flying pieces of optical disk damaged during rotation are completely prevented from exiting the apparatus. By dividing a protrusion for preventing a damaged optical disk from flying out of the apparatus into a first protrusion and a second protrusion, with one protrusion provided on an optical disk tray and the other on a support member, any possibility of the optical disk flying out of the apparatus can be completely prevented, even if the height of each of the first and second protrusions is lowered. Because the second protrusion is lowered, the protrusion will not catch on the optical disk tray or the optical disk, and so a smooth sliding operation of the optical disk tray can be ensured.

Optical disk apparatus with opposing protective protrusions

Growing community of inventors

Tokyo, Japan

Hiroaki Miyasaka