Optimaization of PAPR using Non-Linear Companding with Weighting Function for MIMO-OFDM Systems
Rebba Chandra Sekhar1, D. Nagamani2
1Rebba Chandra Sekhar, Assistant Professor, Department of ECE, Anil Neerukonda Institute of Technology and Sciences Autonomous, Sangivalasa, Bheemunipatnam Visakhapatnam (A.P), India.
2D. Nagamani, Assistant Professor, Department of ECE, Anil Neerukonda Institute of Technology and Sciences Autonomous, Sangivalasa, Bheemunipatnam Visakhapatnam (A.P), India.
Manuscript received on 14 February 2019 | Revised Manuscript received on 05 March 2019 | Manuscript Published on 08 June 2019 | PP: 393-398 | Volume-7 Issue-5S4, February 2019 | Retrieval Number: E10840275S419/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a key wireless broadband technology employed in Long Term Evaluation (LTE), LTE -Advanced (LTE-A) and World Wide Interoperability for Microwave Access (WiMAX) cellular standards. Multi carrier modulated systems (MCM) is the fundamental principle for OFDM where the wideband frequency selective channels are splited into narrow band frequency flat faded channels, results in reducing Inter Symbol Interference (ISI). OFDM offers several advantages like orthogonality and low complexity at the transmitter and receiver by replacing number of modulators/de modulators by Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT) respectively. The motivation behind MIMO is high data rate. High data rate communication link with transmission rates 1Gigabits/sec or more. That barrier can be achieved using the conventional SISO configuration at the cost of much power and much bandwidth. MIMO-OFDM is the solution to above problems and provides enormous data rates and channel quality without premium on bandwidth and power. One of the major drawbacks of MIMO-OFDM system is high Peak to Average Power Ratio. The high PAPR causes signal clipping which leads to information loss and inter carrier interference. In this paper weighting function with Non-linear companding technique (mu-law) is used to optimize the PAPR for MIMO-OFDM systems. Weighting function is pulse shaping function which consist of smooth shape with low frequency components and should not interfere with transmitted bits. Simulation results are performed in MATLAB; Results shown that by choosing proper weighting function with mu-law value the PAPR of OFDM system is effectively decreased.
Keywords: MIMO, LTE, OFDM, LTE-A, PAPR, WIMAX, Precoding, BER, Mu-Law Companding, CCDF.
Scope of the Article: Software Defined Networking and Network Function Virtualization