Novel Signal Separation Principle Based on DFT with Extended Frame Fourier Analysis

スポンサーリンク

概要

• 論文の詳細を見る

• In general, a time-limited signal such as a single sinusoidal waveform framed by a frame period T can be utilized for conveying a multi-level symbol in data transmission. If such a signal is analyzed by the conventional DFT (Discrete Fourier Transform) analysis, the infinite number of frequency components with frequency spacing f_D=T^lt-1gt is needed. This limits the accuracy with which the original frequency of the unframed sinusoidal waverform can be identified. It is especially difficult to identify two similar framed sinusoids whose frequency spacing is narrower than f_D. An analytical principle for time-limited signals is therefore proposed by introducing the concept of an Extended Frame into DFT. Waveform analysis more accurate than DFT is achieved by taking into account multiple correlations between extended frames made of an input frame signal and the element frequency components corresponding to the length of each extended frame. In this approach, it is possible to use arbitrary element frequency spacing less than f_D. It also allows an element frequency to be selected as a real number times of f_D, rather than as an integer times of f_D that is used for DFT. With this analyzing mechanism, it is verified that an input frame signal with only the frequency components which coincide with any of the element frequencies can be exactly analyzed. The disturbance caused by the input white noise is examined. As a result, it is found that the superior noise suppression function is achieved by this method over a conventional matched filter. In addition, the error caused by using a finite number of element frequencies and the A/D conversion accuracy required for sampling an input signal are examined, and it is shown that these factors need not impede practical implementation. For this reason, this principle is useful for multi-ary transmission systems, noise tolerant receivers, or systems requiring precise filtering of time limited waveforms.

• 社団法人電子情報通信学会の論文
• 1996-02-25

著者

• Suehiro Naoki

  The Institute Of Applied Physics University Of Tsukuba

• KUROYANAGI Noriyoshi

  the Faculty of Technology, Tokyo Engineering University

• GUO Lili

  the Faculty of Technology, Harbin Engineering University

• Guo Lili

  The Faculty Of Technology Harbin Engineering University

• Kuroyanagi Noriyoshi

  The Faculty Of Technology Tokyo Engineering University

• Kuroyanagi Noriyoshi

  The Faculty Of Techno1ogy Tokyo Engineering University

関連論文

• Novel Signal Separation Principle Based on DFT with Extended Frame Fourier Analysis
• A Design Principle for Colored-Noise-Tolerant Optimum Despreading-Code Sequences for Spread-Spectrum Systems

スポンサーリンク