Table 1 Comparative study of the computation complexity of DFT-based, DCT-based, and DST-based OFDMA models
From: Secure image transmission through LTE wireless communications systems
OFDMA model | Transmitter/receiver | Computations |
|---|---|---|
DFT-based | Tx | M × M Multiplications and M × M Additions |
Rx | M × M Multiplications and M × M Additions | |
Equalizer with N-point | ||
No IDFT is applied | ||
DCT-based | Tx | M × M Multiplications only |
Rx | M × M DFT Multiplications and M × M DFT Additions | |
Equalizer with M-point | ||
M-point IDFT is applied, M-point DCT is followed | ||
DST-based | Tx | M × M Multiplications only |
Rx | M × M DFT Multiplications and M × M DFT Additions | |
Equalizer with M-point | ||
M-point IDFT is applied, M-point DST is followed |