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For the Inventor, By the Inventor

Tokyo, Japan

Hitosi Matui

USPTO Granted Patents = 11

Average Co-Inventor Count = 1.1

ph-index = 7

Forward Citations = 112(Granted Patents)


Company Filing History:

goldMedal11 out of 35,689 
 
Nec Corporation
 patents

Years Active: 1992-2003

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11 patents (USPTO):Explore Patents
1. 6587521 - Signal estimator and program stored memory medium (2003-07-01),
2. 6473470 - Phase-locked loop circuits for communication system (2002-10-29),
3. 6438118 - Code-multiplexing communication apparatus (2002-08-20),
4. 6400778 - DC-offset canceller (2002-06-04),
5. 6035006 - Estimator having a feedback loop (2000-03-07),
6. 5987015 - Code division multiplexing communication system and method (1999-11-16),
7. 5942955 - Quasi-GMSK modulator (1999-08-24),
8. 5903556 - Code multiplexing communication system (1999-05-11),
9. 5448203 - Negative-feedback amplifier and feedback controlling method thereof (1995-09-05),
10. 5345452 - Adaptive equalizer for removing nonlinear distortions from digital (1994-09-06),
11. 5124979 - Digital data transmission device for a composite transmission signal (1992-06-23),

Title: Hitosi Matui: Innovator in Signal Processing Technologies

Introduction

Hitosi Matui is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of signal processing, holding a total of 11 patents. His work focuses on developing advanced technologies that enhance communication systems.

Latest Patents

Among his latest patents is a signal estimator and program stored memory medium. This innovative signal estimator can track a large frequency offset. A received signal, which is distorted during transmission, is phase-rotated by a phase rotator and then estimated using the maximum likelihood sequence estimator (MLSE). The phase detector identifies a phase difference between a delayed phase-rotated signal and information about a minimum path metric in the Viterbi algorithm operation by the MLSE. After filtering the phase difference signal, the voltage-controlled oscillator (VCO) receives the filtered signal, allowing for controlled phase rotation based on the VCO's output.

Another notable patent involves phase-locked loop circuits for communication systems. In this design, a phase-locked loop circuit incorporates a signal estimator such as MLSE or DDFSE to accurately detect and correct phase deviations. The phase deviation is maintained within a predetermined value by amplitude limiting a phase deviation signal obtained from both a received signal and a replica signal. This ensures that the phase deviation signal remains free from significant errors, regardless of any estimation errors generated in the MLSE or DDFSE.

Career Highlights

Hitosi Matui is currently employed at NEC Corporation, where he continues to innovate and develop cutting-edge technologies. His expertise in signal processing has positioned him as a key figure in the advancement of communication systems.

Collaborations

Throughout his career, Hitosi has collaborated with notable colleagues, including Hideho Tomita and Takeshi Yamamoto. These partnerships have contributed to the successful development of various technologies and patents.

Conclusion

Hitosi Matui's contributions to signal processing and communication technologies are noteworthy. His innovative patents and collaborations reflect his commitment to advancing the field. His work continues to influence the development of more efficient communication systems.

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