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OFDM-IJF-OQPSK Modulation Scheme |
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Abstract: Orthogonal Frequency Division Multiplexing (OFDM) suffers from high out-of-band radiation. In this paper, an OFDM-IJF-OQPSK modulation scheme is proposed. Every subcarrier of this scheme is modulated with Intersymbol Interference and Jitter Free-Offset Quadrature Phase Shift Keying (IJF-OQPSK), instead of Multi-level Phase Shift Keying (MPSK) or Multi-level Quadrature Amplitude Modulation (MQAM). On the basis of analyzing OFDM and IJF-OQPSK principle, OFDM-IJF-OQPSK modulation scheme is presented firstly, and then its Power Spectrum Density (PSD) is derived. It is shown that the final PSD is the summation of all the IJF-OQPSK baseband PSDs at all subcarriers of OFDM. Finally, the performance is analyzed by computer simulation and the results show that the out-of-band radiation of this modulation scheme can be reduced significantly.
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Received: 24 August 2010
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Corresponding Authors:
Hai-Long ZHAO
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