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Gupta, Prabal
- Hadamard Matrix based Selected Mapping Hybridized with Clipping Technique for Peak to Average Power Ratio Reduction in OFDM System using Several Sub-carriers
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Authors
Affiliations
1 Department of ECE, Dev Bhoomi Group of Institute, Dehradun - 248007, Uttarakhand, IN
2 Department of ECE, Guru Nanak Dev Engineering College, Ludhiana - 141006, Punjab, IN
3 School of ECE, Lovely Professional University, Phagwara - 144411, Punjab, IN
1 Department of ECE, Dev Bhoomi Group of Institute, Dehradun - 248007, Uttarakhand, IN
2 Department of ECE, Guru Nanak Dev Engineering College, Ludhiana - 141006, Punjab, IN
3 School of ECE, Lovely Professional University, Phagwara - 144411, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 9, No 45 (2016), Pagination:Abstract
High Peak to Average Power Ratio (PAPR) introduces distortion in the information when MultiCarrierModulation (MCM) technique like Orthogonal Frequency Division Multiplexing(OFDM) is used. OFDM is generally preferred when higher data rates are required. So it has become a requirement for the system which is using OFDM to diminish PAPR problem. So, in this paper we are proposing a novel technique in which we are using Selected Mapping (SLM) with clipping technique under Hadamard matrix based phase sequence designed in frequency domain. In the conventional SLM technique which uses multiple phase sequence possessing same length as that of the data sequence in order to diminish PAPR. Therefore, it is highly demanded that we have to propose a technique by which we can design phase sequence in frequency domain easily and can optimized the results in time domain. So, we have implemented an algorithm which design phase sequence in frequency domain conveniently and after transformation through inverse Fast Fourier Transform (IFFT) optimize in time domain accordingly. Along with this, we have hybridized clipping technique in time domain so that if in any case PAPR problem is found to be greater than certain threshold then it can clip it in the time domain sequence domain itself. Simulation results clearly provide the justification and efficiency of proposed algorithm as compared with conventional OFDM, SLM and Clipping technique. Proposed novel algorithm attains a significant gain (dB) of 2.85,2.65,2.35,2.05,2.60 and 2.70 in comparison with conventional OFDM system considering several number of sub carriers (N)=32,64,128,256,512 and 1024 respectively.Keywords
Complementary Cumulative Distribution Function (CCDF), Orthogonal Frequency Division Multiplexing (OFDM), Peak to Average Power Ratio (PAPR), Selected Mapping (SLM).- Time Domain Optimization using Hadamard Matrix Based Phase Sequence and DCT with Classic Frequency Domain Partition Partial Transmitted Sequence(CFDP-PTS) Scheme for the Reduction of Peak to Average Power Ratio (PAPR) in OFDM System
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Authors
Affiliations
1 School of ECE, Lovely Professional University, Phagwara - 144411, Punjab, IN
1 School of ECE, Lovely Professional University, Phagwara - 144411, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 9, No 47 (2016), Pagination:Abstract
Partial transmitted sequence (PTS) is the most important technique for the minimization of problem peak to average power ratio (PAPR) found in multicarrier system i.e., Orthogonal Frequency Division Multiplexing (OFDM). But PTS scheme undergo a very difficult and complex process of designing random phase sequences which are used for optimization of subblocks of data stream in time domain after applying Inverse Fast Fourier Transform (IFFT) so that the problem PAPR can be minimized. Hence in this paper we are proposing a technique in which we have used hadamard matrix for the optimization of sub-blocks of data stream in time domain after IFFT along with discrete cosine transform. So this proposed technique drastically reduced the complexity of designing phase sequence and help in recovering the same information back at the receiver side with the help of index of individual rows of hadamard matrix. Simulation results are presented under multiple sub carriers (N)=64,128 and 256, classic frequency domain partition partial transmitted sequence(CFDP-PTS)=3 and 4 shows a significant gain (dB)of around 3.8 and 1.4 in comparison of conventional OFDM system and traditional PTS technique respectively under N=128 and CFDP=4.Keywords
Classic Frequency Domain Partition Partial Transmitted Sequence (CFDP-PTS), Complementary Cummulative Distributive Function (CCDF), Peak to Average Power Ratio (PAPR)- Performance Improvement of Orthogonal Frequency Division Multiplexing System by Reducing Peak to Average Power Ratio using FDCSS (Frequency Domain Cyclic Shift Sequence) Combined with SLM and Clipping Technique
Abstract Views :154 |
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Authors
Prabal Gupta
1,
R. K. Singh
2,
R. K. Singh
2,
Balpreet Singh
3,
Balpreet Singh
3,
B. Arun Kumar
3,
B. Arun Kumar
3
Affiliations
1 School of ECE Lovely Professional University, Jalandhar-Delhi, G.T. Road, National Highway 1,Phagwara, Jalandhar – 144411, Punjab, IN
2 Department of ECE, Guru Nanak Dev Engineering College, Gill Park, Ludhiana - 141006, Punjab,, IN
3 School of ECE Lovely Professional University, Jalandhar-Delhi, G.T. Road, National Highway 1, Phagwara, Jalandhar – 144411, Punjab, IN
1 School of ECE Lovely Professional University, Jalandhar-Delhi, G.T. Road, National Highway 1,Phagwara, Jalandhar – 144411, Punjab, IN
2 Department of ECE, Guru Nanak Dev Engineering College, Gill Park, Ludhiana - 141006, Punjab,, IN
3 School of ECE Lovely Professional University, Jalandhar-Delhi, G.T. Road, National Highway 1, Phagwara, Jalandhar – 144411, Punjab, IN