基于修正素數(shù)碼的紅外PPM碼分多址通信系統(tǒng)
Performance of Indoor Infrared PPM-CDMA Systems Using Modified Prime Sequence Codes
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摘要: 分析基于修正素數(shù)碼的紅外脈沖位置調(diào)制(PPM)碼分多址同步通信系統(tǒng)和引入光硬限幅器的同步通信系統(tǒng)誤碼性能.考慮多用戶干擾、背景光散粒噪聲和接收機熱噪聲情況下,推導(dǎo)有、無光硬限幅器的紅外PPMCDMA同步系統(tǒng)誤比特率上限。分析結(jié)果表明,基于修正素數(shù)碼的光硬限幅器同步系統(tǒng)的誤碼性能優(yōu)于無光硬限幅器系統(tǒng)的誤碼性能。
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關(guān)鍵詞:
- 碼分多址; 修正素數(shù)碼; PPM; 光硬限幅器
Abstract: The performance of infrared wireless synchronous Code Division Multiple Ac-cess(CDMA) with Pulse Position Modulation(PPM) signaling systems without optical hard limiter and with optical hard limiter using modified prime sequence codes as signature codes is analyzed. The upper bound on the bit error probability of systems without optical hard limiter and with optical hard limiter are derived taking into account the effect of multiple-user interference, the photodetector shot noise and thermal noise. Numerical results show that the performance of systems with optical hard limiter is superior to that without optical hard limiter. -
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