Investigation of Optimal Cyclic Prefix Length for 4G Fading Channel

  • Ch. Vijay
  • G. Sasibhushana Rao
  • Vinodh Kumar Minchula
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 701)


The Orthogonal Frequency Division Multiplexing (OFDM) system plays a key role in 4G communication systems due to its ability to mitigate the frequency selective fading in a multipath channel. Channel fading causes Intersymbol Interference (ISI) and Intercarrier Interference (ICI) because of delay spread effect. These problems can be reduced by correlating the cyclic prefix with the OFDM symbol. This paper analyzes the OFDM performance with and without cyclic prefix of various lengths by considering the Bit Error Rate (BER) as performance metric. Results indicate that for an optimum cyclic prefix length (FFT length = 128 and cyclic prefix size = 16), the BPSK modulation technique is providing better BER performance when compared to other modulation techniques such as QPSK, 8PSK, 8QAM, 16QAM, 32QAM, and 256QAM.


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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Ch. Vijay
    • 1
  • G. Sasibhushana Rao
    • 1
  • Vinodh Kumar Minchula
    • 1
  1. 1.Department of Electronics and Communication Engineering, A.U.C.E(A)Andhra UniversityVisakhapatnamIndia

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