An Efficient Hierarchical Modulation based Orthogonal Frequency Division Multiplexing Transmission Scheme for Digital Video Broadcasting

2018 ◽  
Vol 31 (4) ◽  
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Digital Video ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Scheme ◽  
Hierarchical Modulation ◽  
Digital Video Broadcasting ◽  
Video Broadcasting

scholarly journals SISTEM SIARAN DIGITAL VIDEO BROADCASTING TERESTRIAL 2 (DVB-T2) DI SCTV BATAM

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Toni Kusuma Wijaya
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Digital Video ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Compact Disk ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Television Receiver ◽  
Integrated Receiver ◽  
Video Disc

Populernya teknologi Broadcast dengan transmisi Digital menggeser  teknologi transmisi analog. Teknologi broadcast digital membutuhkan  bandwidth yang lebih lebar , memiliki fleksibilitas yang tinggi. Siaran televisi digital menyajikan gambar dan suara yang jauh lebih stabil dan resolusi lebih tajam, ini dimungkinkan oleh penggunaan sistem Orthogonal Frequency Division Multiplexing (OFDM) yang mampu mengatasi efek lintas jamak (multipath), sehingga televisi digital menawarkan kualitas gambar yang sama dengan kualitas DVD (Digital Versatile/Video Disc), dan kualitas suara pun mampu mencapai kualitas CD (Compact Disk). Bagaimana penggunaan frekuensi pada sistem penyiaran digital dapat diefisienkan ? Jawabannya terletak pada penggunaan teknologi OFDM sebagai teknik modulasi. Dengan OFDM, frekuensi dengan lebar bandwidth tertentu dibagi-bagi menjadi sejumlah subcarrier sehingga memungkinkan sejumlah program dapat dikirimkan melalui sebuah frekuensi carrier. Proses siaran televisi digital yang menggunakan standar Digital Video Broadcasting Terestrial 2 (DVB-T2) di Stasiun Transmisi SCTV Batam dimulai dari penerimaan dengan parabola yang diteruskan ke Integrated Receiver Decoder (IRD) yang mana ini adalah dalam satu blok diagram yaitu Television Receiver Only (TVRO). Output dari IRD masuk ke input Multiplexer ( MUX ) dan output Mux menuju sistem DVB T2 itu sendiri dan outputnya langsung diinputkan ke transmitter  untuk dipancarkan.  Dengan TV digital, satu frekuensi dapat digunakan untuk 6-8 siaran yang berbeda. Dengan keunggulan ini, keterbatasan jumlah kanal dalam spektrum frekuensi siaran dapat diatasi dan memungkinkan munculnya stasiun-stasiun televisi baru yang lebih banyak .

scholarly journals Analisa Simulasi Performansi Penggunaan Orthogonal Frequency Division Multiplexing Pada Sistem Digital Video Broadcasting-Terrestrial

2017 ◽  
Vol 3 (1) ◽  
pp. 65
Author(s):  
Dian Widi Astuti
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multipath Fading ◽  
Block Type ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Guard Interval ◽  
Pilot Channel

Orthogonal Frequency Division Multiplexing (OFDM) merupakan suatu teknik transmisi yang menggunakan beberapa buah frekuensi pembawa (multicarrier) dalam satu saluran dimana setiap frekuensi pembawa tersebut saling orthogonal (tegak lurus). OFDM banyak dipakai untuk sistem komunikasi wireless mengingat kemampuan dari OFDM mengatasi multipath fading yang menyebabkan terjadinya intersymbol interference (ISI). Dampak dari ISI tersebut adalah penerima tidak dapat membaca sandi informasi dengan benar sehingga mengurangi performasi sistem komunikasi digital. Cara OFDM mengatasi ISI adalah dengan menggandakan simbol dan menambah simbol secara periodik yang digunakan sebagai guard interval. Penambahan dari guard band yang terlalu lebar bisa mengurangi throughput data yang dikirimkan. Fading juga menyebabkan amplitudo dan phasa berfluktuatif sehingga cara untuk mengatasinya adalah estimasi kanal (Channel Estimation) dengan menyisipkan simbol pilot pada pengiriman frame OFDM sehingga penerima dapat memperkirakan karakteristik kanal dan dapat mengembalikan data yang terkirim. CE terdiri atas comb-type pilot channel estimation dan block-type pilot channel estimation. DVB-T sebagai penyiaran televisi digital terestrial juga memakai OFDM dengan skema modulasi OFDM tambahan yaitu berupa pilot simbol atau yang lebih dikenal dengan estimasi kanal (Channel Estimation). Mengingat jumlah subcarrier dari DVB-T cukup besar jika dibandingkan dengan aplikasi lain yang menggunakan OFDM maka perlu dilakukan sebuah penelitian tentang analisa performasi penggunaan OFDM untuk sistem DVB-T terhadap perubahan guard interval, modulasi dan penggunaan kanal pada estimasi kanal tersebut.

scholarly journals Efficient Load Forecasting Optimized by Fuzzy Programming and OFDM Transmission

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Sandeep Sachdeva ◽  
Maninder Singh ◽  
U. P. Singh ◽  
Ajat Shatru Arora
Keyword(s):  
Developing Countries ◽  
Orthogonal Frequency Division Multiplexing ◽  
Load Forecasting ◽  
Developed Countries ◽  
Fuzzy Regression ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Scheme ◽  
Outer World ◽  
Hourly Basis

Today, it is very important for developed and developing countries to consume electricity more efficiently. Though developed countries do not want to waste electricity and developing countries cannot waste electricity. This leads to the concept: load forecasting. This paper is written for the short-term load forecasting on daily basis, hourly, or half-hourly basis or real time load forecasting. But as we move from daily to hourly basis of load forecasting, the error of load forecasting increases. The analysis of this paper is done on previous year's load data records of an engineering college in India using the concept of fuzzy methods. The analysis has been done on Mamdani-type membership functions and OFDM (Orthogonal Frequency Division Multiplexing) transmission scheme. To reduce the error of load forecasting, fuzzy method has been used with Artificial Neural Network (ANN) and OFDM transmission is used to get data from outer world and send outputs to outer world accurately and quickly. The error has been reduced to a considerable level in the range of 2-3%. For further reducing the error, Orthogonal Frequency Division Multiplexing (OFDM) can be used with Reed-Solomon (RS) encoding. Further studies are going on with Fuzzy Regression methods to reduce the error more.

scholarly journals Number of subcarrier filter coefficients in GFDM system: effect on performance

Ingenius ◽  
2019 ◽  
pp. 53-61
Author(s):  
Randy Verdecia Peña ◽  
Humberto Millán Vega
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Modulation Scheme ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Scheme ◽  
System Effect ◽  
Simple Method ◽  
Multicarrier Transmission ◽  
Prototype Filter

Generalized Frequency Division Multiplexing (GFDM) is a non-orthogonal multicarrier transmission scheme proposed for fifth (5G) and future generation wireless networks. Due to its attractive properties, it has been recently discussed as a candidate waveform for the future wireless communication systems. GFDM is introduced as a generalized form of the widely used Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme and it uses only one cyclic prefix (CP) for a group of symbols. The main focus of this work is to present like impact on the system performance the coefficient quantity of the subcarrier filter. A simple method for the computation of the coefficients of the prototype filter is employed. Besides, it is presented a structure for the GFDM by taking advantage of the arrangement in the modulation matrix. We evaluated the Bit Error Rate (BER) using the receiver models presented in this work. The results showed that the BER is affected according to the coefficients quantity of the prototype filter. Based on the obtained results, the coefficients quantity has a relation with the number of time slots of the GFDM system.

scholarly journals Integrated Antenna for the Digital Audio Broadcasting and Digital Video Broadcasting by Orthogonal Frequency Division Multiplexing

2019 ◽  
Vol 8 (11) ◽  
pp. 3320-3328
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Digital Audio ◽  
Frequency Division ◽  
Ofdm System ◽  
Unified Approach ◽  
High Definition ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Digital Audio Broadcasting ◽  
Integrated Antenna

Digital Audio Broadcasting (DAB) system is one of the high - definition radio with the ability to provide high audio quality and data - based services for stationary and mobile receivers. Digital Video Broadcasting (DVB) is the popular broadcasting standards that enable handheld receivers to receive high definition digital television transmissions. Orthogonal Frequency Division Multiplexing (OFDM) system is a digital multi – carrier modulation technique intend offers high spectral efficiency. The main aim set is to arrive as an efficient unified system for multipurpose wireless system that would cater to all existing standards. This paper presents the unified approach for designing an integrated antenna for DAB and DVB using OFDM system. In this paper DAB and DVB using OFDM system is designed individually and their performance is measured by Bit Error Rate (BER). Integrated antenna for DAB and DVB using OFDM system is designed and simulated radiation patterns are presented. The proposed unified approach produces the better BER performance and better gain as compared to individual standard design

High Capacity and Power Efficient PON Combining ACO-OFDM and WDM Technologies

2014 ◽  
Vol 909 ◽  
pp. 260-264
Author(s):  
Kai Guo ◽  
Yun Jia Zhang ◽  
Dan Luo ◽  
Zhuo Liu
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
High Capacity ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Scheme ◽  
Power Efficient ◽  
Ofdm Signal

An upstream transmission scheme of asymmetric clipping optical orthogonal frequency division multiplexing (ACO-OFDM) based WDMA-PON is proposed. Performance of 10Gbit/s/ONU upstream ACO-OFDM signal is analyzed. The scheme is high capacity and power efficient.

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