发明授权
- 专利标题: Spread spectrum communication device
- 专利标题(中): 扩频通信设备
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申请号: US09020738申请日: 1998-02-09
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公开(公告)号: US06181731B2公开(公告)日: 2001-01-30
- 发明人: Tetsuya Kochi , Fumio Kanaya , Hiroaki Tanaka
- 申请人: Tetsuya Kochi , Fumio Kanaya , Hiroaki Tanaka
- 优先权: JP9-025126 19970207
- 主分类号: H04L2730
- IPC分类号: H04L2730
摘要:
The invention provides a small-sized low-cost spread spectrum communication device including a narrow-band interference signal elimination circuit capable of covering all the frequency band of a spread signal. A spread signal is received by an antenna and supplied to a level detection circuit via a variable amplifier and a divider. The level detection circuit controls the variable amplifier so that the spread signal is amplified to a fixed level. The signal containing a narrow-band interfering signal is then passed through a plurality of magnetostatic filters connected in series such that the saturation level thereof successively decreases, thereby limiting the narrow-band interfering signal having a level greater than the level of the spread signal in a step-by-step fashion. Thus, the narrow-band interfering signal contained in the spread signal is limited to a low level without encountering a significantly large incidental reduction in the spread signal. The narrow-band interference signal elimination circuit according to the invention may be realized in the form of a small size.