BER Analysis of LTE-4G Standard Rayleigh Flat Fading Channel with Adaptive Modulation

  • Rajeswara Rao GangulaEmail author
  • Sasibhushana Rao Gottapu
Conference paper
Part of the Lecture Notes in Networks and Systems book series (LNNS, volume 33)


It is a challenging task to improve reliable and high-speed data communication between Transmitter and Receiver. Achieving high data rate using block codes and convolution codes is still questionable through a wireless channel. Turbo codes are a class of high performance forward error correction (FEC) codes with OFDM with adaptive Modulation for 4G and LTE applications. In this paper, BER analysis is carried out for TURBO-coded OFDM data with adaptive modulation mode switching using BPSK, QPSK, 16QAM, and 64QAM. Adaptive modulation scheme is assisted by decision feedback equalizer (DFE) which controls modulation mode. Its output SNR is used as a switching metric. DFE is used to select modulation mode. It is observed that average spectral efficiency (bits per second/Hz) is much higher for adaptive modulation scheme. For higher modulation scheme average spectral efficiency is gradually increases up to 40 dB, that indicates its throughput is much higher in comparison with fixed modulation modes.


Data communication Block codes Convolution codes Turbo code forward error correction 16QAM 64QAM Adaptive modulation 


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Rajeswara Rao Gangula
    • 1
    Email author
  • Sasibhushana Rao Gottapu
    • 2
  1. 1.G.V.P. College of Engineering (Autonomous)VisakhapatnamIndia
  2. 2.Andhra University college of EngineeringVisakhapatnamIndia

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