Efficient Transceiver Design for Digital Video Broadcast based Orthogonal Frequency Division Multiplexing and 4 Quadrature Amplitude Modulation

Different modulation schemes have been used in variety of communications systems such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 8-PSK, 16 PSK, 32 PSK, differential binary phase shift keying (D-BPSK), D-QPSK, 4 quadrature amplitude modulation (4 QAM), 16 QAM, 32 QAM, and 64 QAM. On the other hand, different multiplexing schemes have been used such as: frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM) and orthogonal frequency division multiplexing (OFDM). Of all the addressed modulation and multiplexing techniques 4 QAM and OFDM respectively have been utilized in this paper to design efficient digital video broadcast (DVB) transceiver system. Also, the current paper presents efficient schemes to reduce the peak average power ratio (PAPR) a raised from multi-carrier of OFDM. OFDM has different advantages over the other kinds of multiplexing techniques such as; it is a multi-carrier transmission scheme uses both the inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) algorithms in transceiver design, the use of FFT eliminates arrays of sinusoidal generators and coherent demodulation required in parallel data systems and makes the implementation of the technology cost effective, OFDM is the most promising candidates for efficient bandwidth utilization, and excellent behavior in the case of multipath reception. Moreover; provides the lowest multi-path distortion, highest data rate, lowest bit error rate (BER). In addition to; be able to eliminate inter symbol interference (ISI) and inter channel interference (ICI). On the other hand, 4 QAM provides the lowest error rate. Simulation results have been carried out using Matlab programming and approved that; the superiority of the addressed schemes for the system design over the conventional schemes of modulation and multiplexing, where we have got the lowest BER, reduced the disturbing issue of PAPR, and we have implemented the system's technology with low complexity in the design using the fast algorithms of both the IFFT and FFT for the modulator and demodulator respectively.