Performance evaluation of optically preamplified dicode pulse position modulation receivers

Abstract

SUMMARYAn analysis for optically preamplified dicode pulse position modulation (DiPPM) receivers is presented for the first time. The performance at two different bit rates (622 Mbit/s and 2.5 Gbit/s) is analysed and compared with equivalent optically preamplified pulse position modulation (PPM) and on-off keyed nonreturn-to-zero (OOK NRZ) systems. Additionally a new derivation for the average power of the DiPPM pulse stream is provided and the sensitivity performance is compared with that obtainable from a previous formula, with results that are somewhat more conservative. For optically preamplified systems it is shown that PPM significantly outperforms DiPPM and OOK NRZ, when using the DiPPM average power formula derived here, but DiPPM could still show a sensitivity benefit over OOK NRZ of 4.2 dB.

VLC system performance using Dicode Pulse Position Modulation over an indoor diffuse link

“…In this case the wrong-slot errors can be eliminated and taken as falsealarm errors. Then the total error probability is expressed [6][7][8]13] as:…”

“…The sensitivity of the DiPPM receiver can be calculated in dBm [13] as follows while that of digital PPM system is where, is the frequency of the received light, b is the number of photons per pulse, n is the DiPPM run length, is the number of PCM bits and h is Planck's constant. For DiPPM the slot duration is While for digital PPM the slot duration is where is a PCM bit time and is the guard intervals length.…”