Novel Papr Reduction Technique by Combining Slm with Clipping and Filtering Technique for Mimo-ofdm System

Increased demand of multimedia system applications leads to high speed transmission speed that may be gratified by OFDM (orthogonal frequency division multiplexing). In wireless transmissions, OFDM is extremely smashing technology as it provides flexibility and high speed.One of the major drawbacks in the MIMO-OFDM is high peak-to-average power ratio (PAPR).Clipping & Filtering, Selected mapping (SLM), Partial transmit sequence (PTS) are some of the techniques which minimizes the PAPR. Many schemes have been proposed by scholars for decreasing the PAPR of OFDM signals, which can be categorized put into two categories. PAPR schemes can be classified as multiplicative or additive schemes, where PAPR reduction is carried out in the OFDM modulator.SLM is multiplicative scheme because the phase sequences are multiplied with input symbol sequences or OFDM signal sequences whereas clipping are additive schemes because the reference signals are added. In this paper, a hybrid approach for reducing Peak to Average Power Ratio in OFDM is presented. The method is based on SLM approach with clipping and filtering technique. Performance of the proposed method is evaluated and compared with the existing techniques. Keywords— Orthogonal Division Multiplexing Division (OFDM), Multiple-Input-Multiple-Output (MIMO), Peak-to-Average Power Ratio (PAPR), Selected Mapping (SLM), Clipping and Filtering, Conventional Hybrid (CH). INTRODUCTION For 4G and 5G wireless communications broadband the Multiple-input-Multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) is that the dominant air interface. MIMO technology is joined to produce a lot of reliable communications at rapid speed that divides a radio channel into an outsized range of closely spaced sub channels. During the mid-1990s the analysis conducted that whereas MIMO may be used with alternative common air interfaces, for instance, code-division multiple access (CDMA) and time-division multiple access (TDMA), at higher information rates the mixture of OFDM and MIMO is sensible [1]. For the mobile broadband network and most advanced wireless local area network (WLAN) the MIMO-OFDM is the establishment since it conveys the most elevated limit and information throughput and accomplishes the best spectral potency. Utilizing OFDM modulation at higher speed the MIMO would be most sensible, because rapid information channel is changing over through the OFDM into various parallel lower-speed channels. The presence of the multiple transmit antennas (multiple input) and multiple receive antennas (multiple output) is indicated by the term “MIMO”, in modern usage . Whereas International Journal of Advances in Engineering Research http://www.ijaer.com (IJAER) 2017, Vol. No. 13, Issue No. V, June e-ISSN: 2231-5152, p-ISSN: 2454-1796