1 Introduction. Coherent optical transmission systems using high-order quadrature amplitude modulation (QAM) formats joined by digital signal processing (DSP) have been paid more attention, due to ...

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BER Research of OFDM Systems under QPSK and 16-QAM Modulation Abstract: The fifth generation (5G) mobile communication technology is the research hotspot in the field of mobile communication at home ...

Later on they have implemented a QPSK modulation technique using reversible logic and the QPSK modulator unit will be modelled using HDL code and simulation will be done by ModelSim 6.0 ...

The performance of the modulation techniques-Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) are studied in the Nakagami channel and the Rician Channel.

The modulation scheme, moduType must be one of 'BPSK', 'QPSK', '16QAM', '64QAM', '256QAM'. symbsIn must be a column vector. 'mothod' - Specified as 'max-log-map' or 'approx'. Demodulation is performed ...

Fig. 3: Simplified block diagram of the project. The QPSK modulator and demodulator with Costas phase-locked loop and DAC/ADC drivers are placed in FPGA. Also, the GNU Radio application prepares the ...

Figure 5 shows a basic block diagram of a complete end-to-end OFDM system consisting of a transmitter and receiver. ... 60 kHz, 120 kHz, 240 kHz, 480 kHz) with up to 3300 subcarriers. The subcarrier ...