Hitachi, Ltd.

Norie Hara

Kyosuke Achiwa

Kazuyuki Hori

Masamitsu Nishikido

Shouhei Murakami

Toshiaki Kurokawa

A cluster computing system includes an active system and a standby system connected via wire networks. The active system and the standby system each has a wireless communications apparatus, such that when all of the wire networks connecting the active system with the standby system are disconnected, the wireless communications apparatus of the active system reports the standby system of the failure of the active system using its wireless communications capability with the wireless communications apparatus of the standby system. The report includes the verification ID of the active system, and the standby system begins operation upon receiving a packet containing the verification ID.

Cluster computing system and its failover method

Unlike a prior art digital predistortion compensation device for determining a compensation coefficient based on absolute value information about a baseband complex input signal, the present invention performs distortion compensation calculation in accordance with a complex coefficient polynomial using real and imaginary parts of the baseband complex input signal as its variables.

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Hiratsuka, Japan

Norie Hara