Panasonic Corporation

Nobuhiro Takagi

Tomohiro Yui

Koji Suzuki

Yoshinao Kawai

Yasutaka Uramoto

Gou Kaise

Yukiteru Murao

Atsushi Taguchi

The dynamic DC offset canceling apparatus includes: sectionthat detects dynamic DC offset in longest overlapping part sequences from the differences between the sampling values of a first longest overlapping part sequence and the sampling values of a second longest overlapping part sequence, the first longest overlapping part sequence and the second longest overlapping part sequence being overlapping part sequences in a training sequence of the received signal; sectionthat detects dynamic DC offset outside the longest overlapping part sequences from the difference between an average value of sampling values of a received signal which exists in a burst before the first longest overlapping part sequence, and an average value of sampling values of a received signal which exists in a burst after the second longest overlapping part sequence; and sectionthat adaptively subtracts a DC offset value from the received signal based on these results.

Dynamic DC offset canceling apparatus and dynamic DC offset canceling method

A dynamic DC offset removal apparatus and a dynamic DC offset removal method capable of accurately estimating a change position of a dynamic DC offset and a DC offset value before the change and a DC offset value after the change, thereby carrying out equalization processing on a reception signal whose dynamic DC offsets are removed, and improving a bit error rate characteristic. In receiverhaving a dynamic DC offset removal apparatus, dynamic DC offset detection sectioncalculates a DC offset value before the change and a DC offset value after the change, and DC offset change timing from the maximum value and minimum value calculated at maximum value search sectionand minimum value search sectionand the first-half mean value, second-half mean value and overall mean value calculated at first-half mean value calculation section, second-half mean value calculation sectionand overall mean value calculation section, and compensation DC offset switching sectionof DC offset removal sectionswitches between the DC offset value before the change and DC offset value after the change based on the DC offset change timing and removes dynamic DC offsets from the reception signal.

Dynamic DC offset removal apparatus and dynamic DC offset removal method

Growing community of inventors

Kanagawa, Japan

Nobuhiro Takagi