基于修正素数码的红外PPM码分多址通信系统
Performance of Indoor Infrared PPM-CDMA Systems Using Modified Prime Sequence Codes
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摘要: 分析基于修正素数码的红外脉冲位置调制(PPM)码分多址同步通信系统和引入光硬限幅器的同步通信系统误码性能.考虑多用户干扰、背景光散粒噪声和接收机热噪声情况下,推导有、无光硬限幅器的红外PPMCDMA同步系统误比特率上限。分析结果表明,基于修正素数码的光硬限幅器同步系统的误码性能优于无光硬限幅器系统的误码性能。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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