Fujitsu Corporation

Takahiro Kurakata

Hideo Miyazawa

Takashi Kaku

Hiroyasu Murata

In a noise canceling method and an apparatus therefor which notices the colored noise looked macroscopically, positively cancels the dominant noise component in the low frequency band, shifts the S/N value to plus, and can extract the reception signal buried in the low frequency band and having a comparatively high level, a signal in which a time axis, an amplitude, and a phase are specified or a zero-point signal is inserted into a transmission signal by an inserter, a noise component is interpolated by using the specified signal or the zero-point signal by a noise canceler, and an originally transmitted signal is regenerated by subtracting the noise component from the reception signal.

Noise canceling method and apparatus

In a synchronization method and apparatus in a data transmission using a transparent transmission line, a periodic amplitude modulation is applied, or a zero-point is inserted, as a synchronizing signal to a transmission signal point on a transmission side at a preceding stage of a transparent transmission line. Also, in case of a frame synchronization, a power value of a received signal is calculated on a reception side of the above-mentioned transparent transmission line and the synchronizing signal is vectorized using the power values whose phases are different from each other by 90 degrees on a time axis.

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Kawasaki, Japan

Takahiro Kurakata