Power consumption reduction on RADAR MIMO using Lift Wavelet Transform – Orthogonal Frequency Division Multiplexing (LWT-OFDM)

TELECOMMUNICATION

The RADAR MIMO uses multiple antennas on emitter and receiver for avoiding doppler effects, improving the robustness of binary error of transmission. A multicarrier modulation like Orthogonal Frequency Division Multiplex (OFDM) is introduced. The problems of OFDM is concerned about Discret Fourier Transform (DFT) which gives Peak Average Power Ratio (PAPR) and high time processing. This article replaces the DFT by Discret Cosine Transform (DCT) and Lift Wavelet Transform (LWT). This study presents the difference RADAR MIMO OFDM. We did a simulation on Matlab about the RADAR MIMO OFDM using multiple transformations like DFT, DCT and LWT and compared the results (Power Average Power Ration or PAPR, Bit Error Ratio or BER) on each methods. We present all mathematics formulas with simplified diagrams and evaluate the time complexity of each method. As a result, we can deduce that time consumption for LWT is much lower than DCT and DFT. This method doesn’t use exponential calculations but just addition and substraction formula. The LWT also presents a lower PAPR but has a larger BER. So, LWT-OFDM presents a good performance in reduction of power consumption on RADAR MIMO instead of classic DCT or DFT OFDM.

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