Performance of CE-MSK-OFDM for long haul optical transmission

The Constant Envelop Minimum Shift Keying Orthogonal Frequency Division Multiplexing (CE-MSK-OFDM) technique is proposed for data transmission without causing InterCarrier Interference (ICI). In this scheme, during modulation there is no amplitude variation in the carrier wave so it maintains Peak to Average Power Ratio(PAPR) and using Minimum Shift Keying can produce Constant Envelop(CE) due to its smooth phase transitions. The conventional Orthogonal Frequency Division Multiplexing (OFDM) system has the ability to counteract fiber nonlinearity, excellent resistance to chromatic dispersion and reduce PAPR Normally, OFDM uses Quadrature Phase Shift Keying (QPSK) modulation technique it decrease PAPR but when there is a abrupt amplitude variations the higher order terms of phase modulated signal, will make each data to spread over multiple subcarrier and it induces a large ICI. In QPSK the modulated signal cannot be of continuous phase and it provides slow roll off side lobe spectrum which decays asymptotically. The proposed technique can mitigate the inherent drawbacks of Constant Envelop Quadrature Phase Shift Keying Orthogonal Frequency Division Multiplexing (CE-QPSK-OFDM).