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

The Design of Mobile Television in Europe

2009 ◽  
pp. 1143-1167
Author(s):  
Pieter Ballon ◽  
Olivier Braet
Keyword(s):  
Business Model ◽  
Business Models ◽  
Digital Audio ◽  
Model Framework ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Digital Audio Broadcasting ◽  
Technological Service ◽  
Mobile Broadcasting ◽  
Mobile Television

Mobile television is potentially the most anticipated mass-market mobile application across Europe. This chapter examines the business model design of mobile TV by the various stakeholders currently piloting mobile broadcasting in the European national markets. It adapts a generic business model framework to systematically compare five recent pilots of the two mobile broadcasting technologies that are currently trialled most intensively in Europe, that is, digital video broadcasting-handheld (DVB-H) and digital audio broadcasting-Internet protocol (DAB-IP). The article illustrates the cross-impact of cooperation agreements between the various stakeholders with technological, service- related, and financial design choices. It also provides insights as to the likely business models in the upcoming commercialisation phase of mobile broadcasting in Europe.

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 Deep neural network for orthogonal frequency division multiplexing systems without cyclic prefix transmission

2018 ◽  
Vol 189 ◽  
pp. 04016
Author(s):  
Viet-Hung Nguyen ◽  
Minh-Tuan Nguyen ◽  
Yong-Hwa Kim
Keyword(s):  
Neural Network ◽  
Orthogonal Frequency Division Multiplexing ◽  
Deep Neural Network ◽  
Cyclic Prefix ◽  
Wireless Transmission ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System ◽  
New Approach ◽  
Multiplexing Systems

Orthogonal frequency division multiplexing (OFDM) is widely used in wired or wireless transmission systems. In the structure of OFDM, a cycle prefix (CP) has been exploited to avoid the effects of inter-symbol interference (ISI) and inter-carrier interference (ICI). This paper proposes a new approach to transmit the signals without CP transmission. Using the deep neural network, the proposed OFDM system transmits data without the CP. Simulation results show that the proposed scheme can estimate the CP at the receiver and overcome the effect of ISI.

scholarly journals Channel estimation of OFDM in C-band communication systems under different distribution conditions

2021 ◽  
Vol 23 (3) ◽  
pp. 1778
Author(s):  
Heba Abdul-Jaleel Al-Asady ◽  
Hassan Falah Fakhruldeen ◽  
Mustafa Qahtan Alsudani
Keyword(s):  
Fourier Transform ◽  
Channel Estimation ◽  
Fast Fourier Transform ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System ◽  
High Data ◽  
High Efficient

<p>Orthogonal frequency division multiplexing (OFDM) is a transmission system that uses multiple orthogonal carriers that are sent out at the same time. OFDM is a technique for mobile and wireless communication that has high-efficient frequency utilization, high data-rate transmission, simple and efficient implementation using the fast Fourier transform (FFT) and the inverse fast Fourier transform (IFFT), and reduces inter symbol interference (ISI) by inserting cyclic prefix (CP). One of the most important approaches in an OFDM system is channel estimation. In this paper, the orthogonal frequency division multiplexing system with the Rayleigh channel module is analyzed for different areas. The proposed approach used large numbers of subcarriers to transmit the signals over 64-QAM modulation with pilot add channel estimation. The accuracy of the OFDM system is shown in the measuring of the relationships of peak power to the noise ratio and bit error rate.</p>

Generalized Trapezoidal Companding Technique for PAPR Reduction in OFDM Systems

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Saruti Gupta ◽  
Ashish Goel
Keyword(s):  
Bit Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Frequency Division ◽  
Performance Parameters ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Ofdm Signal ◽  
Specific Degree ◽  
Ofdm Signals

Abstract The main drawback in the performance of the Orthogonal Frequency Division Multiplexing (OFDM) system is the higher Peak-to-Average Power Ratio (PAPR) of the OFDM signals at the transmitter side. Companding is a well-known technique useful for reducing PAPR in the OFDM signal. This paper proposes a new nonlinear companding scheme that transforms the magnitude of Rayleigh distributed OFDM signal of specific degree into trapezoidal distribution. Additional design parameter is used in the proposed companding scheme to make the companding function more flexible. In the designed OFDM system the companding function has more degree of freedom which improves the PAPR and bit error rate (BER) parameters of the designed system. It has been demonstrated that the designed companding scheme provides more flexibility to accomplish an optimum trade-off between the performance parameters PAPR and BER of the designed OFDM system.

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