Abstract
A wide range of multimedia applications must be supported by the modern fifth generation (5G) wireless communication systems for realizing the diverse applications in smart cities. The diverse applications such as real-time monitoring of roads, smart homes, smart industries, etc., for a sustainable smart city emphasizes a robust and efficient image transmission. In this paper, the influence of maximal ratio combining (MRC) on the reception of images with different orthogonal frequency division multiplexing (OFDM) versions is studied. The different OFDM versions considered here are the fast Fourier transform (FFT) based OFDM and discrete cosine transform (DCT) based OFDM. A comparison between diverse modulation levels for the images transmitted through different OFDM methodologies, along with variation in a number of receiving antennas for MRC, is proposed for additive white gaussian noise (AWGN) and Rayleigh fading channels. The diverse modulation levels used are binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 8-PSK, and 16-PSK. The parameters that are used to compare different versions of OFDM for MRC antenna configurations are signal-to-noise ratio (SNR) vs. bit error rate (BER) and peak signal-to-noise ratio (PSNR) at the receiver as an estimation parameter for the received image quality.
Highlights
In the quest of increasing the data capacity of the orthogonal frequency division multiplexing (OFDM) system, the bit error rate (BER) experienced at the receiver side keeps on increasing due to the existence of inter-carrier interference (ICI) and inter-symbol interference (ISI) [2] Besides, elevated BER the OFDM system experiences the problem of high PAPR, which occurs due to the non-linear operations of the power amplifiers installed at the transmitter side
The DCT based OFDM system is analogous to fast Fourier transform (FFT) based OFDM system, but the IFFT and FFT modules are swapped by inverse discrete cosine transform (IDCT) and DCT
The concept of robust and efficient image transmission required for a sustainable smart city is realized by utilizing a hybrid combination of multiple input multiple output (MIMO) and OFDM
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In the quest of increasing the data capacity of the OFDM system, the BER experienced at the receiver side keeps on increasing due to the existence of inter-carrier interference (ICI) and inter-symbol interference (ISI) [2] Besides, elevated BER the OFDM system experiences the problem of high PAPR, which occurs due to the non-linear operations of the power amplifiers installed at the transmitter side. To mitigate such problems, various hybrid schemes are implemented in combination with OFDM systems.
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