BER Performance of OFDM-BPSK and -QPSK Over Generalized Gamma Fading Channel

Abstract

In this paper, the BER performance of OFDM-BPSK and -QPSK system over generalized gamma fading channel has been reported. This model is versatile enough to represent short-term fading such as Weibull, Nakagami-m, or Rayleigh as well as shadowing. The flexibility of this model is because of two fading parameters compared to only one in Nakagami-m fading model, which helps to analyze the severity of fading more deeply. Here, simulations of OFDM signals are carried with generalized gamma faded signal to understand the effect of channel fading.

A Digital Phase Locked Loop based System for Nakagami -m fading Channel Model

“…Bit error rate performance of the DPLL is represented by a BER VS SNR plot Fig.15 for various values of Nakagami fading figure m(h) of Nakagami channel. In recent years, the result of BER analysis for QPSK signaling in Nakagami fading channel has been reported by a few authors [13,14,15]. In their results a BER of the order of above 0.1 at SNR 0dB have been reported.…”

“…Let h t be the Nakagami -m fading samples, x(t) be the transmitted signal sample and a(t) be the AWGN, then the received signal sample r(t) can be given by ( 13) and fading figure or shape factor can measured from…”

Analytical Error Rate Performance Evaluation of OFDM-QPSK System over Nakagami Distribution

“…So this put a limit to increase the value of n beyond the certain value. This fact is expected because according to [6]- [9] we can approximate the Nakagami-n (Rice) distribution by a Nakagamim distribution that means if for the Nakagami-m (Two Tap) case error rate performance degrades with increasing values of m as reported in [1], [11], [20] then same nature of the SER performance should be shown by the Nakagami-n (Rice) fading distribution, and same results, we are achieved in our analysis.…”

“…Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme which is useful to remove the frequency selectivity of the channels because transmitted signals are orthogonal in nature [1]. This special multi carrier technique is based on the fact that the high bit stream data is transmitted over great number of sub-carriers; each has a different frequency and overlapped to each other.…”

“…This special multi carrier technique is based on the fact that the high bit stream data is transmitted over great number of sub-carriers; each has a different frequency and overlapped to each other. Basically this scheme is a combination of multiplexing and modulation which is effectively utilizes to eliminate the need of complex equalization at the receiver side [1][2][3].…”