A Hybrid MQAM-LFSK OFDM Transceiver with Low PAPR

OFDM supports high data rate and generally requires no equalization at the receiver, making it simple and efficient. Besides its several benefits, it suffers from large peak-to-average-power ratio (PAPR) of the transmit signal, due to which its straightforward implementation becomes quite costly. There are several techniques to attack this problem. But, most of them are suited for specific applications or works with small number of subcarriers. Also, some need side information to be transmitted along with the signal to recover the signal properly. In this paper, a hybrid modulator is proposed that reduces PAPR while keeping the OFDM transceiver design simple, as it does not require any side information or a little side information to be sent and is efficient for arbitrary number of subcarriers. The results of the implementations are compared with conventional OFDM system as well as with other techniques like PTS