Abstract
In order to improve the bit-error-rate (BER) performance of free-space optical (FSO) communication systems employing binary phase-shift keying subcarrier intensity modulation (BPSK-SIM), an innovative hybrid modulation scheme called PPM-MSK-SIM is proposed, which is based on pulse position modulation (PPM) and minimum shift keying (MSK) subcarrier intensity modulation. Subsequently, the BER performance of PPM-MSK-SIM is studied in detail for an FSO system over log-normal turbulence channels with avalanche photodiode detection. The results of the numerical simulation show that PPM-MSK-SIM has the advantages of improving the BER performance compared with BPSK-SIM and PPM. For example, at the same received irradiance of $-$ 2.1 dBm and the same strength of turbulence $C_{n}^{2}=7.5\times 10^{-15} {\rm m}^{-2/3}$ , the BER performance of 2-PPM-MSK-SIM can decrease to $1.02\times 10^{-9}$ , whereas those of 2-PPM and BPSK-SIM are just $1.19\times 10^{-7}$ and $2.29\times 10^{-6}$ , respectively. This makes PPM-MSK-SIM a favorable candidate for the modulation technique in FSO communication systems.
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