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Rahmah Niyati Hasyim Effrina Yanti Hamid Bandung Institute of Technology, Indonesia

This paper introduces a novel technique for Carrier Frequency Offset (CFO) estimation using cyclic prefix in Generalized Frequency Division Multiplexing (GFDM) systems for Machine Type Communication (MTC) scenarios, improving synchronization performance for 5G applications.

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Rahmah Niyati Hasyim Effrina Yanti Hamid Bandung Institute of Technology, Indonesia

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  1. ISMS 2018 8th International Conference on Intelligent Systems, Modelling and Simulation 8-10 May, Kuala Lumpur Carrier frequency offset estimation using cyclic prefix in gfdm systems for machine type communication application Rahmah Niyati Hasyim Effrina Yanti Hamid Bandung Institute of Technology, Indonesia

  2. content • Introduction • Background Theory • Overview GFDM • Parameter System MTC • Carrier Frequency Offset • Research Problem and Research Aim • Proposed Method • Result • Conclusion

  3. introduction

  4. 5G application 5G URLL MTC eMBB Low Energy Consumption Narrowbandwidth Loose Synchronization

  5. 4G 5G OFDM GFDM Orthogonal Non-orthogonal

  6. Background theory

  7. Overview GFDM A Add CP GFDM Modulator Channel Mapping H-1 B vv Demapping vv GFDM Demodulator Remove CP synchronization Equalization

  8. Modulator gfdm Upsampler MK g0,0[n] M-QAM d0,0 Upsampler MK d0,M-1 g0,M-1[n] M-QAM Serial to Parallel Data bits do, d1, ...dn x[0],x[1],...x[N-1] Ʃ ....... ....... ....... ....... Upsampler MK dK-1,0 gK-1,0[n] M-QAM Upsampler MK dK-1,M-1 gK-1,M-1[n] M-QAM

  9. Parameter system of mtc scenario [1] [1] J.Ferreira, H.Rodrigues, A.Gonzales, A.Nimr, M.Matthe, D.Zhang,L.Mendes, and G.Fettweis, “GFDM Frame design for 5G application scenarios,”JOURNAL OF COMMUNICATION AND INFORMATION SYSTEMS, Vol.32. No.1, 2017.

  10. Carrier frequency offset • When frequency of transmitter oscillator and receiver oscillator does not match, then offset will occure. This offset or called as carrier freqeuncy offset will also occure when the transmitter or receiver is moving, because of doppler effect.

  11. Where foffset is frequency carrier multiple by frequency error of Oscillator and fsc is subcarrier spacing. In this simulation, frequency carrier is 8 GHz and subcarrier spacing is 240 KHz

  12. Research problem and research aim

  13. Research problem • GFDM has disadvantage in which its performance becomes poor when the carrier frequency offset (CFO) exists in the system. • Range of estimation CFO that is narrow which cannot estimate bigger value of normalized CFO

  14. Research aim • The aim of this paper is to propose a new CFO estimation technique using CP in GFDM with MTC scenario system. This proposed estimation technique is actually similar to that in [2] for OFDM. It later shows that the proposed technique can increase the range of normalized CFO. [2] S.E.Ibrahim, K.A.Elbarbary, R.M.El-Sagheer, “Maximizing CFO estimation range using a new OFDM symbol structure,” International Journal of Computer Application (0975-8887), vol.88,no.4, February 2014.

  15. Proposed method

  16. Structure of proposed method x(N-Ng),...,x(N-1) x(0),x(1),...,x(Ng-1) x(0),x(1),...,x(Ng-1) x(0),...,x(N-Ng-1) x(Ng),...,x(N-1) x(N-Ng),...,x(N-1) CP CP GFDM Symbol GFDM Symbol

  17. Cfo estimation of proposed method Received signal with normalized cfo effect Received signal after CFO estimation

  18. result

  19. effect of cfo in ser performance

  20. Result of estimation technique This result is taken while the SNR value is 20 dB. It is clear that the proposed technique can estimate the normalized CFO almost accuratelly

  21. Comparison of ser performance

  22. Comparison of mse performance

  23. conclusion

  24. In this paper we show the synchronization performance of GFDM using parameter for MTC technology. Overall performance with proposed method can handle the normalized CFO. Compare with others method of synchronization, the proposed method can work well for less data symbol and give good mean square error. It shows that GFDM with proposed method of synchronization suitable for 5G scenario or MTC technology.

  25. acknowledgment • The authors wish to express their gratitude for the financial support of this research from the Lembaga Pengelola Dana Pendidikan Indonesia (Indonesia Endowment Fund for Education) Scholarship.

  26. Thank you

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