Welcome to Masayoshi Tanaka Website
Research activities of wireless & satellite communications in the following laboratories.
- College of Industrial Technology, Nihon University,
Department of Electrical and Electronic
Engineering.
- NTT Electrical Communications Laboratories.
田中 將義 （たなか まさよし）ウエブサイト
以下の組織でのワイヤレス通信，衛星通信の研究成果
- 日本大学 生産工学部 電気電子工学科
- NTT 電気通信研究所
Wireless communications signal processing technology with FPGA
We can obtain the following interesting radio communications devices by using FPGAs (Field programmable gate arrays) or DSPs (digital signal processors).
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flexible adaptation to environmental change.
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high performance.
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free from performance fluctuation and deviation.
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reduction of design and manufacturing terms.
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reduction of space.
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We are investigating the software-defined wireless communications systems using FPGAs and DSPs.
We have developed an FPGA direct digital synthesizer (DDS) with reduced internal memory and noise. DDS is an important component in many digital communication systems. In particular, DDS will be used for constructing a digital down converter in a satellite multibeam system with beamforming technology.
We propose a new DDS system with reduced internal memory. In addition, we investigate the phase noise and spurious level with dithering and feedback methods.
Example： DDL(Direct digital synthesizer) with less memory volume
Fig. 1 The role of DDS in Beam Forming Network.
Fig. 2 Principle of DDS.
Fig. 3 Configuration of New DDS.
Fig. 4 Configuration of memory in new DDS.
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Fig. 5 Memory reduction effect of new DDS.
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