書誌事項
- タイトル別名
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- A Study on Railway Signal System to Apply CDMA-QAM Method
- CDMA-QAM方式の鉄道信号システムへの適用に関する一検討
- CDMA QAM ホウシキ ノ テツドウ シンゴウ システム エ ノ テキヨウ ニ カンスル イチ ケントウ
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Recently, QAM (Quadrature Amplitude Modulation) transmission is paid to attention in digital modulation method, and it has been used for wireless LAN and digital broadcasting. QAM is a modulation method that puts information on carrier amplitude and phase. So QAM can achieve high-capacity data transmission that the use efficiency of frequency band is good. But QAM has a bad characteristic that is weak to the noise and the interference because distance between each symbol is short. Then we propose the method that not transmission data but CDMA signal, obtained after transmission data is modulated by spread code and multiplexed, is given to each symbol of QAM. And we studied about railway signal system on track circuit as a sample to apply this method. As result of computer simulations, we verified to be able to achieve the improvement of signal to noise ratio by optimizing the constellation map of QAM. We report with the method of a synchronous acquisition.
収録刊行物
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- 電気学会論文誌Ｄ（産業応用部門誌）
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電気学会論文誌Ｄ（産業応用部門誌） 126 (3), 337-344, 2006
一般社団法人 電気学会
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詳細情報 詳細情報について
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- CRID
- 1390282679635943424
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- NII論文ID
- 10017276607
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- NII書誌ID
- AN10012320
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- ISSN
- 13488163
- 09136339
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- NDL書誌ID
- 7857958
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可