PERFORMANCE IMPROVEMENT OF OFDM

Authors

  • Vishakhal Kulkarni Electronics And Telecommunication Department, Deogiri Institute Of Engineering And Management Studies
  • Vitthal Bhosale Electronics And Telecommunication Department, Deogiri Institute Of Engineering And Management Studies
  • Dr. R.M. Autee Electronics And Telecommunication Department, Deogiri Institute Of Engineering And Management Studies

Keywords:

BCH coding, Convolution coding, Bit Error Rate (BER), Signal To Noise Ratio (SNR), Orthogonal Frequency Division Multiplexing (OFDM), Adaptive Modulation

Abstract

The several assets for high-speed data transmission over wireless uses the Orthogonal Frequency Division
Multiplexing (OFDM) as it is a multicarrier transmission scheme. A large number of narrow bandwidth carriers is
therefore adopted by the OFDM. Individually for an OFDM, each subcarrier is attenuated under the frequency-selective
and fast fading channel, therefore the resulting gain is high attenuation which leads to poor performance of all OFDM
subcarriers if the same fixed transmission scheme are used. Thus the main goal of the indicated paper is to grab an
understanding of the inequality between fixed & adaptive modulations schemes as the introduction of the adaptive
modulation. The need for the above system is to make use of the speaker's voice to check their character and control
approach to administrations, for example, voice dialing data administrations, voice send, and security control for secret
data. The performance of paperwork basically states that implementation of adaptive modulation is done into blocks of
adjacent subcarriers which is the result of dividing whole subcarriers. Therefore the equivalent modulation scheme which
is the calculation of average instantaneous signal to noise (SNR) is exercised to entire subcarriers of the equal block. The
OFDM system average bit error rate (BER) performance is observed here under fixed modulation and adaptive
modulation, and these modulation techniques are recorded by accepting the different inverse fast Fourier transforms
(IFFT) size and uncomplicated adaptive Quadrature amplitude modulation (QAM) strategy. The simulation in MATLAB
shows the results as the performance of fixed modulation is inferior to that of the BER performance of OFDM system
using adaptive modulation. The prospective adaptive modulation and coding Technique uses OFDM to manage the fixed
BER under changing the channel.

Published

2019-12-25

How to Cite

Vishakhal Kulkarni, Vitthal Bhosale, & Dr. R.M. Autee. (2019). PERFORMANCE IMPROVEMENT OF OFDM. International Journal of Advance Engineering and Research Development (IJAERD), 6(12), 74–78. Retrieved from https://ijaerd.com/index.php/IJAERD/article/view/4530