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MC-CDMAMulti-Carrier Code Division Multiple Access
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The pilot based CFO estimation is employed by inserting the pre-defined data in every MC-CDMA symbol in order to track the variations of channel and CFO.
The simplified block diagram of MC-CDMA system with duobinary coded pilot based receiver phase rotated conjugate ICI cancellation is shown in Fig.
Mattera (2013) reported that in blind CFO estimation, the frequency offset is estimated by measuring the correlation between two MC-CDMA symbols at the receiver.
The CFO is estimated by measuring the phase shift of pilot tones on two successive MC-CDMA symbols as specified by Michele Morelli and Marco Moretti(2013).
As an alternative to the use of the guard time, different MC-CDMA receiver structures that rely on the use of antenna diversity and equalising techniques have been proposed [2]-[4].
In section II, the MC-CDMA system model over multipath fading is presented, and the transmitter model is discussed.
With MC-CDMA [5]-[6], each data symbol is simultaneously transmitted on Q Binary Phase Shift-Keying (BPSK) narrowband subcarriers, each separated by q/[T.
In this section, we investigate the MC-CDMA system performance gauged by the bit error rate (BER) through analysis and simulation.
From equation (1) denotes signals of all subcarriers after demodulation at the receiver, to implement turbo blind detection in MC-CDMA systems.
The MC-CDMA system model has been developed and simulated using MATLAB version 7.
2 illustrates the BER performance comparison of the Log MAP based Turbo MUD, PSO based Turbo MUD and MPSO based Turbo MUD of MC-CDMA system for iteration 5 over Rayleigh Channel respectively.
4 shows that the BER performance of MC-CDMA system using MPSO based Log MAP Turbo MUD has been compared with PSO based Log MAP Turbo MUD and Log-MAP Turbo MUD over the AWGN and Rayleigh channel respectively.