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LED3 is for optimum, while LED10 is for minimal level indications. Glowing of LEDs means matlab programming tank is empty. Assemble two separate units, one for matlab programming transmitter and matlab programming other for matlab programming receiver. To construct matlab programming sensor assembly, metal clamps can be used as shown in Fig. 4. These are placed over an insulated aluminium pipe. On matlab programming other hand, as matlab programming signal constellation in M ary modulation is relieved, SACO OFDM has simple transceiver architecture and occasional detection complexity. Moreover, due to the fact that matlab programming spectral, an superior SACO OFDM ESACO OFDM using even subcarriers is proposed. In this method, matlab programming odd subcarriers are activated for SACO OFDM, and matlab programming imaginary a part of even subcarriers are activated for pulse amplitude modulated discrete multitone PAM DMT. Clearly, ESACO OFDM achieves better spectral efficiency than matlab programming traditional optical OFDM, since all subcarriers are used for data transmission. Simulation results verify matlab programming gigantic bit error rate BER and peak to average power ratio PAPR improvement by matlab programming proposed ESACO OFDM, peculiarly for matlab programming medium to high signal to noise ratio SNR regime. In this paper, safety issues for optical orthogonal frequency department multiplexed OFDM structures are emphasised.