Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia. rodionov@iitp.ru|Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia. rodionov@iitp.ru|Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia. rodionov@iitp.ru|Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia. rodionov@iitp.ru|Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia. rodionov@iitp.ru