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Performance Analysis of Modulation Techniques in 5G Communication System

China Communications 2022年第8期19卷 100-114页

作者： Muhammet Tahir Guneser Ahmed Salahaldeenali Sahab Cihat Seker Electrical and Electronics Engineering Department Engineering FacultyKarabuk UniversityTurkey

In the 5^(th) generation mobile communication(5G)system,better bitrate,better power consumption,and better Bit Error Rate are needed.To meet all these requirements in 5G,the waveform is important.Although the Orthogonal Frequency Division Multiplexing(OFDM)modulation scheme has been commonly used in 4G,it is difficult to meet the requirements of 5G.A lot of candidate waveforms are discussed in the 5G system included Filter Bank Multicarrier(FBMC),Universal Filtered Multicarrier(UFMC),Filtered OFDM(F-OFDM),and Generalized Frequency Division Multiplexing(GFDM),etc.However,since GFDM is no longer widely used,in this paper,FBMC,UFMC,and F-OFDM modulation schemes are discussed and compared with OFDM.Power Spectral Density(PSD),Bit Error Rate(BER),Transmitted Signal Power,Peak Average Power Ratio(PAPR)and Bit Rate parameters of the modulation schemes are studied and compared with OFDM.FBMC demonstrates to be the most promising modulation scheme for 5G systems.

关键词： PSD PAPR OFDM FBMC UFMC fofdm

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Layered ACO-fofdm for IM/DD Systems

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ZTE Communications 2017年第3期15卷 56-62页

作者： GUO Mengqi ZHOU Ji TANG Xizi QIAO Yaojun Beijing University of Posts and Telecommunications Beijing 100876 China

We propose a layered asymmetrically clipped optical fast orthogonal frequency division multiplexing(ACO-fofdm)scheme for intensitymodulated and directdetected(IM/DD)systems. Layered ACO-fofdm can compensate the weaknessof conventional ACO-fofdm in low spectral efficiency. For fofdm system, the utilization of discrete cosine transform(DCT) instead of fast Fourier transform(FFT) can reduce thecomputational complexity without any influence on bit errorrate(BER) performance. At transmitter, the superposition ofmultiple layers is performed in frequency domain, and the iterative receiver is used to recover transmitted signals by subtracting the clipping noise of each layer. We compare theBER performance of the proposed layered ACO-fofdm system and DC-offset fofdm(DCO-fofdm) system with optimal DCbias at the same spectral efficiency. Simulation results show that in terms of optical bit energy to noise powerratio, the layered ACO-OFDM system has 1.23 dB, 2.77 dB,3.67 dB and 0.78 dB improvement at the forward error correction(FEC) limit compared with DCO-fofdm system whenthe spectral efficiencies are 1 bit/s/Hz, 2 bits/s/Hz, 3 bits/s/Hz and 4 bits/s/Hz. The layered ACO-fofdm system with zero DC-bias is more suitable for adaptive system, so this system also has potential for application in IM/DD systems.

关键词： fofdm ACO.fofdm DCT spectral efficiency IM/DD

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