Patents by Inventor Tsuneo Hikokubo

Tsuneo Hikokubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Communication quality estimation method, communication quality estimation apparatus, and communication system
    Patent number: 7130587
    Abstract: An average signal point amplitude detection section 15A determines an average position of I and Q components when a received QPSK modulated signal is demodulated and a threshold calculation section 15B determines threshold ths on an IQ plane based on the average signal point position of the received QPSK modulated signal and a theoretical distribution position on the IQ plane of signal points of a 16-value QAM signal. Then, a threshold decision section 14A makes a threshold-decision on the I and Q components of sequentially received QPSK modulated signals using this threshold ths and thereby calculates a simulated bit error rate of the 16-value QAM signal.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: October 31, 2006
    Assignees: National Institute of Information and Communications Technology Incorporated, Administrative Agency, Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsuneo Hikokubo, Katsuaki Abe, Yutaka Murakami, Shinichiro Takabayashi
  • Communication quality estimation method, communication quality estimation apparatus, and communication system
    Publication number: 20050075103
    Abstract: An average signal point amplitude detection section 15A determines an average position of I and Q components when a received QPSK modulated signal is demodulated and a threshold calculation section 15B determines threshold ths on an IQ plane based on the average signal point position of the received QPSK modulated signal and a theoretical distribution position on the IQ plane of signal points of a 16-value QAM signal. Then, a threshold decision section 14A makes a threshold-decision on the I and Q components of sequentially received QPSK modulated signals using this threshold ths and thereby calculates a simulated bit error rate of the 16-value QAM signal.
    Type: Application
    Filed: August 22, 2002
    Publication date: April 7, 2005
    Inventors: Tsuneo Hikokubo, Katsuaki Abe, Yutaka Murakami, Shinichiro Takabayashi