PAPR Reduction in MIMO-OFDM Using Modified PTS Scheme With Hybride ABC-FF Algorithem

K Aruna Kumari,Dr K Sri Rama Krishna

doi:10.14419/ijet.v7i4.5.20196

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is an admired method for high data rate wireless transmission. OFDM can be clubbed with antenna arrays at the transmitter and receiver to increase diversity gain to enhance the system capacity on time variant and frequency selective channels, resulting in (Multi input and Multi output)MIMO. One main flaw of MIMO-OFDM is that the signals transmitted on different antennas might exhibit a prohibitively large Peak-to-Average Power Ratio (PAPR). There are two techniques mainly used to mitigate the effect of PAPR namely Partial Transmit Sequence (PTS) and Selective Mapping (SLM). In this paper a new optimized Partial Transmit Sequence (PTS) scheme and SLM for PAPR reduction in MIMO-OFDM have been proposed. Both the techniques are connected in series to get efficient throughput. Hybrid of ABC–FF algorithm has been intended for optimal phase factor. The proposed technique has achieved better results than existing techniques. This intended technique has been implemented on the working platform of MATLAB.

Highlights

The increasing developments in telecommunication raised the need for efficient usage of spectral resources, the multiplexing techniques in particular
It is employed in wireless applications such as Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB-T), the ETSI HIPERLAN/2 standard, the IEEE 802.11a standard for Wireless Local Area Networks (WLAN) and the IEEE 802.16a standard for Wireless Metropolitan Area Networks (WMAN) [1, 5, 6, 7, 8, and 9]
The objective of the Partial Transmit Sequence (PTS) technique is to select the phase factor of the combined signal to minimize the Peak to Average Power Ratio (PAPR) [16]. This requires a number of iterations to be performed to find the optimum combination of phase factors for sub blocks [21], which results in the search complexity and increases exponentially with the number of sub blocks [3]

Summary

Introduction

The increasing developments in telecommunication raised the need for efficient usage of spectral resources, the multiplexing techniques in particular. OFDM is used for high data rate wireless communications because of its robustness to frequency selective fading, high spectral efficiency and low computational complexity [3] [4]. It is employed in wireless applications such as Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB-T), the ETSI HIPERLAN/2 standard, the IEEE 802.11a standard for Wireless Local Area Networks (WLAN) and the IEEE 802.16a standard for Wireless Metropolitan Area Networks (WMAN) [1, 5, 6, 7, 8, and 9]. Are used to increase the average power due to the introduction of redundancy [10] Among these methods, the PTS is one of the most emerging schemes because of high-quality PAPR reduction performance with no limitation to the number of subcarriers [15]. Several researche contributions have been found in the literature to solve the problem of PAPR in MIMO-OFDM

Objectives

Methods

Results