Multi-Carrier Digital Communications: Theory and Applications of Ofdm
Multi-Carrier Digital Communications: Theory and Applications of Ofdm
Crest factor reduction in MC-CDMA employing carrier interferometry codes
EURASIP Journal on Wireless Communications and Networking - Special issue on multiuser MIMO networks
Dummy sequence insertion (DSI) for PAPR reduction in the OFDM communication system
IEEE Transactions on Consumer Electronics
A novel PAPR reduction scheme for OFDM systems: selective mapping of partial tones (SMOPT)
IEEE Transactions on Consumer Electronics
IEEE Journal on Selected Areas in Communications
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This paper proposes a high capacity Carrier Interferometry/Multicarrier Code Division Multiple Access (CI/MCCDMA)system to reduce PAPR (peak-to-average power)through the simultaneous support of high and low data rate transmission. The implementation is done by allocating all sub-carriers to the users who transmit high data rate and alternate odd and even subcarriers are assigned to the other set of users who wish to transmit low data rate. The usage of alternate sub-carriers suggests to split CI codes in odd and even parts leading to an increase in capacity. Reduction in PAPR values is achieved through the phase shift of even CI code using odd sub-carriers by an amount of π/2 and odd CI code using even sub-carriers by -π/2, all measured with respect to the orthogonal codes supporting high data rate transmission. Finally, CI code optimization is done for further reduction in PAPR values. The proposed method also improves BER performance compared to the conventiona lCI/MC-CDMA system. Simulation results duly support this claim.