On the Optimum Ring Ratio Determination for 16-Dapsk Modulation in Ofdm Systems

Abstract

In this paper the multilevel modulation techniques of 16-Differential Amplitude Phase Shift Keying (16-DAPSK) with Orthogonal Frequency Division Multiplexing (OFDM) has been proposed with the optimum ring ratio in flat Rayleigh fading channel. By this way best Bit Error Rate (BER) performance is achieved in 16-DAPSK-OFDM systems. BER derivation and the proposed system simulation results show that optimum ring ratio is obviously different for flat Rayleigh fading channel than AWGN channel. It is concluded the proposed optimum ring ratio between [2.0,2.6] can be a promising choice to achieve optimum BER performance for 16DAPSK-OFDM in flat Rayleigh fading channels.