Low Complexity Partial Transmit Sequence Based Implementation to Reduce Peak to Average Power Ratio in of DM Systems
Akshay Gupta1, Ruprit Sikka2, Pavithra Balaji3
1Mr. Akshay Gupta, Department of Electronics and Communication, VIT University, Vellore (Tamil Nadu), India.
2Ms. Ruprit Sikka, Department of Electronics and Communication, VIT University, Vellore (Tamil Nadu), India.
3Prof. Pavithra Balaji, Department of Electronics and Communication, VIT University, Vellore (Tamil Nadu), India.
Manuscript received on 10 May 2014 | Revised Manuscript received on 20 May 2014 | Manuscript Published on 30 May 2014 | PP: 61-65 | Volume-3 Issue-12, May 2014 | Retrieval Number: L16560531214/14©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 is a extremely useful and one of the most widely used wireless technology. Its high spectral efficiency, low inter symbol interference and very less cross talk makes it highly used in TV broadcasting or wire line systems like ADSL (Asymmetric digital subscriber line). The increasingly useful OFDM (Orthogonal frequency division multiplexing) systems too suffer from one major disadvantage of having a high PAPR, which is due to the superposition of N sub carriers. In this letter we counter the high PAPR (Peak to Average Power ratio) using PTS (Partial Transmit Sequence) algorithm, which is a more efficient technique than some other PAPR reducing techniques like SLM (Selected Mapping), clipping and amplitude filtering. We have lowered the complexity of the algorithm making it highly reliable and much more sharper in terms of lowering the PAPR. Our paper analyzes the PAPR plot in terms of CCDF (complimentary cumulative distributive function) by varying the sub carriers and the sub-blocks in PTS. We also carry out the phase optimization in PTS algorithm by using exhaustive search algorithm and modified exhaustive search algorithm so as to reduce PAPR to a greater extent in OFDM systems.
Keywords: CCDF, Of DM, PAPR, Phase Optimization, PTS, Sub Carriers.
Scope of the Article: Low-power design