Abstract
Nowadays, there is a great demand for ultra-high data rate (UHDR) transmission on most 5th generation wireless networks. In this concern, the multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) scheme is used on a large scale to achieve UHDR transmission with reduced inter-symbol interference (ISI) and inter-carrier interference (ICI). Discrete wavelet transform-based OFDM (DWT-OFDM) provides better orthogonality due to presence of orthogonal wavelets, which mitigates the effects caused by ISI and ICI. Also, it has extended bandwidth than the traditional OFDM systems. But a major drawback in this system is that it suffers from down sampling. The down-sampling effect reduces the actual size of the input bit streams. As a result, the system performance is degraded. For solving this problem, a multilevel redundant discrete wavelet transform (ML-RDWT) is used instead of DWT to achieve improved spectral performance. Here, complex down-sampling operation is eliminated. From the simulation outcomes, it is clearly viewed that effects caused by ICI, ISI and BER are mitigated by improving the performance of CIR. The proposed method employs optimal red deer algorithm (ORDA) to locate the optimized weights for the ICI cancellation system. This algorithm enhances the spectral efficiency by achieving high CIR with reduced BER, ISI and ICI. The BER in the proposed MIMO-ML-RDWT-OFDM-ORDA method is 68%, 76%, 38% and 75%, which is very low when compared to the BER in the existing techniques like MIMO-DWT-OFDM-RDA, MIMO-RNS-OFDM-PNMA, MIMO-OFDM-BMA and MIMO-OFDM-ICIMA. The ISI in the proposed method is 94%, 91%, 95% low when compared to the ISI in the existing techniques. The ICI in the proposed work is 71%, 57%, 73% and 86% low when compared to the ICI in the existing techniques. Therefore, the general performance of the proposed MIMO-ML-RDWT-OFDM-ORDA method is improved in an efficient way with less complexity, error rate and processing delay.
Highlights
The combination of multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) serves as powerful tool for many of the broadband wireless access and standards
The use of optimal Red Deer algorithm (ORDA) helps to find the optimized weights for mitigating the effects caused by inter-carrier interference (ICI), inter-symbol interference (ISI), Bit Error Rate (BER) and carrier-to-interference power ratio (CIR)
The effects caused by ICI, ISI and BER have been mitigated with increased CIR
Summary
The combination of multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) serves as powerful tool for many of the broadband wireless access and standards. The OFDM system can successfully combat inter-symbol interference (ISI), so it is employed on high data rate communication systems [5] Another concern is that information theory indicates that increased system capacity may be achieved through deploying multiple antennas for transmitting and receiving ends of systems by suitable space-time signal processing methods [6, 7]. To diminish the Inter Carrier Interference (ICI), Bit Error Rate (BER) and enhancing the CIR is proposed utilizing the Optimal Red Deer Algorithm (ORDA) for time varying fading channel. For enhancing the spectral efficiency of MIMO-OFDM system, an innovative method of Multilevel Redundant Discrete Wavelet Transform (ML-RDWT) in a MIMO-OFDM framework is proposed with ICI cancellation by improving the CIR with reduced BER and Inter-symbol-interference (ISI). The effects of ICI and ISI in the proposed MIMO-ML-RDWT-OFDM framework and their mitigation are explained
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