An Improved Selected Mapping Scheme for PAPR Reduction in OFDM Systems PDF Download
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Author:
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ISBN:
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Languages : en
Pages : 75
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Book Description
Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. High Peak-to-Average Power Ratio (PAPR), which leads to power inefficiency in the RF portion of the transmitter, is a major drawback of OFDM. Lots of PAPR reduction techniques are proposed in literatures in last two decades. For instance, amplitude clipping, companding, coding, partial transmit sequence, selected mapping (SLM), interleaving, etc. Among these techniques, SLM is a promising distortionless scheme to reduce PAPR. The major drawbacks of SLM are high complexity and the need to transmit side information. This thesis introduced an improved SLM scheme with a PAPR threshold. Mathematic expressions of Complementary Cumulative Distribution Function (CCDF) and expected number of mappings are derived and tested by computer simulations. The improved scheme has much lower computational complexity but keeps the same PAPR reduction performance comparing with traditional SLM technique.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. High Peak-to-Average Power Ratio (PAPR), which leads to power inefficiency in the RF portion of the transmitter, is a major drawback of OFDM. Lots of PAPR reduction techniques are proposed in literatures in last two decades. For instance, amplitude clipping, companding, coding, partial transmit sequence, selected mapping (SLM), interleaving, etc. Among these techniques, SLM is a promising distortionless scheme to reduce PAPR. The major drawbacks of SLM are high complexity and the need to transmit side information. This thesis introduced an improved SLM scheme with a PAPR threshold. Mathematic expressions of Complementary Cumulative Distribution Function (CCDF) and expected number of mappings are derived and tested by computer simulations. The improved scheme has much lower computational complexity but keeps the same PAPR reduction performance comparing with traditional SLM technique.
Author: Neelam Dewangan
Publisher: GRIN Verlag
ISBN: 3656317364
Category : Technology & Engineering
Languages : en
Pages : 100
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Master's Thesis from the year 2012 in the subject Engineering - Communication Technology, grade: none, , course: M.Tech, language: English, abstract: As a promising technique, OFDM has been widely used in emerging broadband communication systems, such as digital audio broadcasting (DAB), high-definition television (HDTV), wireless local area network (IEEE 802.11a and HIPERLAN/2). However, as the OFDM signals are the sum of signals with random amplitude and phase, they are likely to have large PAPR that requires a linear high-power- amplifier (HPA) with an extremely high dynamic range, which is expensive and inefficient. Furthermore, any amplifier nonlinearity causes intermodulation products resulting in unwanted out-of-band power. A number of approaches have been proposed to deal with the PAPR problem, including clipping, clipping-and-filtering (CF), coding, companding transform, active constellation extension (ACE), selected mapping (SLM), partial transmit sequence (PTS), and so on. This thesis proposes an improvement in Selected Mapping technique and Simulation results are compared to existing techniques namely Exponential Companding Transform, Repeated Clipping and Filtering and Adaptive Active Constellation Extension. The improvements which are proposed in classical Selective Mapping technique satisfies the PAPR Reduction criteria with reducing the computational complexity. Also this new scheme has an important advantage of avoiding the extra bits along with the transmitted OFDM signal .This scheme can also be applied to the multiple transmitting antenna cases.
Author: Emad Yacoub Qeryaqos Al-Dalakta
Publisher:
ISBN:
Category :
Languages : en
Pages : 177
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Author: IEEE Staff
Publisher:
ISBN: 9781728156187
Category :
Languages : en
Pages :
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JAC ECC is a venue for extending collaboration between prominent Japanese, African and International researchers from academia and industry in the fields of electronics, communications, and computer engineering
Author: Dijin Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Author: Harish P.
Publisher:
ISBN: 9783659247484
Category :
Languages : en
Pages : 0
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Author: De-Shuang Huang
Publisher: Springer
ISBN: 3319959573
Category : Computers
Languages : en
Pages : 896
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This book constitutes - in conjunction with the two-volume set LNCS 10954 and LNCS 10955 - the refereed proceedings of the 14th International Conference on Intelligent Computing, ICIC 2018, held in Wuhan, China, in August 2018. The 275 full papers and 72 short papers of the three proceedings volumes were carefully reviewed and selected from 632 submissions. The papers are organized in topical sections such as Evolutionary Computation and Learning; Neural Networks; Pattern Recognition; Image Processing; Information Security; Virtual Reality and Human-Computer Interaction; Business Intelligence and Multimedia Technology; Biomedical Informatics Theory and Methods; Swarm Intelligence and Optimization; Natural Computing; Quantum Computing; Intelligent Computing in Computer Vision; Fuzzy Theory and Algorithms; Machine Learning; Systems Biology; Intelligent Systems and Applications for Bioengineering; Evolutionary Optimization: Foundations and Its Applications to Intelligent Data Analytics; Swarm Evolutionary Algorithms for Scheduling and Combinatorial Optimization; Swarm Intelligence and Applications in Combinatorial Qoptimization; Advances in Metaheuristic Optimization Algorithm; Advances in Image Processing and Pattern Techniques; Bioinformatics.
Author: Dr. RAJKUMAR L. BIRADAR
Publisher: Archers & Elevators Publishing House
ISBN: 8119385853
Category : Antiques & Collectibles
Languages : en
Pages : 85
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Author: Dr. Kailas S Patil
Publisher: Lulu.com
ISBN: 1794772650
Category :
Languages : en
Pages : 68
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Author: Xiaolong Li
Publisher: CRC Press
ISBN: 1315687216
Category : Computers
Languages : en
Pages : 400
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Information Technology (IT) is the application of computers and telecommunications equipment to store, retrieve, transmit and manipulate data, often in the context of a business or other enterprise. IT has become one of the most fundamental technologies in today‘s social life, and there are many unsolved issues related to IT and its applications.Th
