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In this paper, we present a new hybrid modulation scheme based on quadrature amplitude modulation (QAM) and the idea  behind  frequency  shift  keying  (FSK)  for  multicarrier systems.  The  proposed  scheme  is  a  request  based modulation  scheme  where  the  QAM  modulated  message signal bits are encoded to different subcarriers based on the message  signal  bits.  This  way  the  subcarrier  index  also carries  some  message  signal  bits  without  its  physical transmission.  Perfect  utilization  of  all  subcarriers  is assumed.  The  proposed  scheme  shows  considerable improvement in spectral efficiency .

SubCarrier Index - QAM, A New Hybrid Modulation Scheme for OFDM