scholarly journals Effect of atmospheric impairments on ku-band free-to-air digital satellite television signals in Lagos State

2020 ◽  
Vol 39 (1) ◽  
pp. 238-245
Author(s):  
A.O. Gbenga-Ilori
Keyword(s):  
Error Correction ◽  
Bit Error Rate ◽  
Error Rate ◽  
Modulation Scheme ◽  
Error Correction Code ◽  
Propagation Models ◽  
Satellite Television ◽  
Satellite Link ◽  
Lagos State ◽  
Ku Band

With the rapid deployment of free-to-air satellite television, there is an increasing need for an accurate propagation prediction tool for satellite link planning. This paper presents an evaluation of deterministic propagation model that is best for the analysis of satellite signal quality at Ku-band in Lagos state, Nigeria. The paper aims at comparing accurate measurements of channel-to-noise (C/N0) and bit error rate (BER) taken at six locations within Lagos state with simulation results derived from the Institut für Rundfunktechnik (IRT) model and modified irregular terrain model (ITM) deterministic propagation models. The work considered the effect of the type of modulation scheme and error correction code used on the C/N0 and BER received using these deterministic propagation models. Results show a deviation of 0.732 dB and 0.285 dB from C/No measurements using the IRT and modified ITM models respectively. This work shows that at more than 1% of the time, both models performed well when compared with measurements. However, at less than 1% of the time, which accounts for periods of heavy rainfall, the modified ITM model performed better. The paper also shows that when error correction code is not used with the modulation scheme deployed, the BER increases rapidly and the effect of using a higher alternate modulation symbol is not evident on achievable data rates. Keywords: Bit error rate, deterministic propagation models, Ku-band, satellite link planning

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

scholarly journals ANALISIS PARAMETER BER DAN C/N DENGAN LNB COMBO PADA TEKNOLOGI DVB-S2

2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Wahyu Pamungkas ◽  
Eka Wahyudi ◽  
Anugrah Ahmad Fauzi
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Second Generation ◽  
Low Noise ◽  
Video Broadcasting ◽  
Ku Band

<p>Instalasi antena parabola berfungsi untuk memudahkan pada saat pengarahan <em>pointing</em> antena ke satelit yang dituju. Permasalahan yang diketahui yaitu bagaimana perilaku parameter <em>Bit Error Rate</em> (BER) dan <em>Carrier to Noise</em> (C/N) pada LNB <em>Combo</em> yang menggunakan teknologi DVB-S2. Setelah instalasi antena parabola dilakukan dan sukses, maka langkah selanjutnya yaitu melakukan <em>pointing</em> antena. <em>Pointing</em> antena diarahkan pada posisi satelit yang akan dituju. Satelit yang akan dituju yaitu Palapa D menggunakan frekuensi C<em>-Band</em> sedangkan Ku<em>-Band</em> diarahkan pada satelit NSS 6. Setelah <em>pointing</em> selesai dilakukan maka langkah selanjutnya yaitu menghubungkan dengan <em>Digital</em> <em>Video Broadcasting Satellite Second Generation </em>(DVB-S2). DVB-S2 merupakan <em>receiver</em>. Parameter yang diamati yaitu parameter BER dan C/N. Parameter BER merupakan perbandingan dengan jumlah <em>bit</em> yang diterima secara tidak benar dengan jumlah <em>bit</em> informasi yang ditransmisikan pada selang waktu tertentu. Parameter C/N merupakan perbandingan nilai pada <em>carrier</em> yang diterima dengan nilai sinyal <em>noise</em> yang dihasilkan dalam suatu<em> link</em>. Diperlukan juga Low Noise Block (LNB) <em>Combo</em> yang berguna untuk mentransmisikan sinyal ke <em>receiver</em>. LNB yang digunakan merupakan LNB <em>Combo</em>, dimana dua buah frekuensi yakni C-Band dan KU-Band menjadi satu dalam sebuah LNB. Setelah melakukan pengukuran dan melihat hasil pengukuran, dapat disimpulkan bahwa LNB <em>Combo</em> berpengaruh pada sinyal C-<em>Band </em>yang dihasilkan, sinyal C-<em>Band</em> akan mengalami penurunan kualitas, ini dibuktikan dari hasil pengukuran yang telah dilakukan bahwa nilai parameter C/N dan BER pada Ku-<em>Band</em> lebih baik daripada nilai parameter C/N dan BER pada C-<em>Band.</em><strong></strong></p>

scholarly journals Performance Improvement of Ber Based on Multipath Forward Error Correction Diversity in Wireless Communication Channels

2020 ◽  
Vol 23 (1) ◽  
pp. 159-171
Author(s):  
Ahmad Baheej
Keyword(s):  
Wireless Communication ◽  
Error Correction ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Multiple Input Multiple Output ◽  
Wireless Communication Systems ◽  
Forward Error ◽  
Diversity Technique

The multipath phenomenon is a major factor that is continually affected negatively the performance of wireless communication systems. Since the receiver gets different copies of the transmitted signal from various paths at different times. Consequently, destructive or constructive interference can occur. Therefore, the performance of wireless communication systems is poor in term of bit error rate. This phenomenon can be taken as an advantage if the multiple – input – multiple – output antenna systems are employed at both transmitter and receiver sides (antenna diversity) to improve the bit error rate performance. This paper focuses on the combination of multipath forward error correction diversity technique with vertical-Bell laboratories layered space-time coding. This will lead to enhance the bit error rate in wireless communication systems. The proposed system used Rayleigh and additive white Gaussian noise as two different channel models. The multipath forward error correction diversity technique treats the multipath propagated signals as unessential copies, to utilise them to enhance the bit error rate limitation in the multiple – input – multiple – output systems. The simulation results showed that the performance of the proposed system can be gradually improved by increasing the number of utilised multipath signals in the multipath forward error correction diversity technique

scholarly journals Nonlinear Distortion Cancellation using Predistorter in MIMO-GFDM Systems

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 620
Author(s):  
Ari Endang Jayati ◽  
Wirawan ◽  
Titiek Suryani ◽  
Endroyono
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Nonlinear Distortion ◽  
Additive White Gaussian Noise ◽  
Future Generation ◽  
Phase Distortion ◽  
Closed Form Expression ◽  
Modulation Scheme ◽  
Nonlinear Distortions ◽  
Saturation Region

Generalized frequency division multiplexing (GFDM) with offset quadrature amplitude modulation (OQAM) is an alternative non-orthogonal modulation scheme for future generation wireless broadband systems. The nonlinearity of high power amplifiers (HPAs) has a very significant effect on the performance of GFDM systems. In this paper, we investigate the effects of nonlinear distortion on the multiple-input multiple-output (MIMO)-GFDM system when the signal is passed the HPA, which is modeled with amplitude and phase distortion. The effects of nonlinear distortion due to the HPA include amplitude distortion, phase distortion, and the spread of signal constellations. These effects also produce harmonic signals and intermodulation outside the frequency band which results in spectral spread. This will then reduce the performance of the MIMO-GFDM system. The contributions of this paper concern three key areas. Firstly, we investigate the effects of nonlinear distortion on the MIMO-GFDM system. We also derive the new closed-form expression bit error rate (BER) in MIMO-GFDM systems that use a memoryless HPA, which is modeled using the Saleh model when passed through the additive white Gaussian noise (AWGN) channel. This model was chosen because it is simple and has AM/AM and AM/PM curves. Secondly, we propose the application of techniques for the linearization of each HPA predistorter on the transmitter side of the MIMO-GFDM system separately. This predistorter is able to compensate for nonlinear distortion caused by the HPA without memory operating in the saturation region. The main contribution of this paper is to investigate the predistorter, which can linearize nonlinear distortion in MIMO-GFDM transmitters. The performance of the proposed scheme is evaluated in terms of spectrum analysis, PAPR analysis, a constellation diagram, and bit error rate (BER) analysis. The simulation results show that the proposed predistorter design succeeds in compensating for nonlinear distortions caused by the HPA for large input back-off (IBO) values.

FPGA based Multichannel Bit Error Rate Tester for Spacecraft Data Acquisition System

2014 ◽  
Vol 3 (2) ◽  
pp. 76
Author(s):  
Manoj Kumar A ◽  
R V Nadagouda ◽  
R Jegan
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Data Transmission ◽  
Modulation Scheme ◽  
Link Performance ◽  
Ethernet Controller ◽  
Transmission Link ◽  
Spacecraft Data ◽  
To Receive ◽  
Ber Analysis

Bit Error Rate (BER) is a principle measure of data transmission link performance. BER tester (BERT) consists of a Pattern Generator and an Analyzer that can be set to the same pattern. The payload data transmitted from the spacecraft consists of one, two or three channels per carrier based on the modulation scheme. The traditional equipments can do BER analysis for only one channel at a time. In order to support multichannel BER analysis, a Personal Computer (PC) based system is designed and implemented in Altera Stratix II (EP2S130F1508C5N) FPGA. Ethernet is configured using WIZnet 5300 (Ethernet Controller) and it is used for communication between FPGA and PC with an application. Application is used to transmit the Pattern Generator’s configurations from PC to FPGA and to receive Analyzer’s status. Packet processing is done for this communication using User Datagram protocol (UDP). On the whole, traditional equipments are replaced by the designed and implemented bit error rate tester.

Simulated Study for OOK Modulation in the Mud Pulse Telemetry

2015 ◽  
Vol 727-728 ◽  
pp. 809-812
Author(s):  
Bo Qin Xu ◽  
Zhu Jun Zhang ◽  
Jun Wei Hu
Keyword(s):  
Numerical Simulation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Pressure Wave ◽  
Signal To Noise Ratio ◽  
Signal Amplitude ◽  
Modulation Scheme ◽  
Drilling Process ◽  
Signal To Noise ◽  
Process Pressure

Mud pulse telemetry (MPT) transmits data from borehole to surface during the drilling process. Pressure wave is generated in the drilling channel and is used as carrier of the downhole data. Through numerical simulation, this paper analyzes the bit error rate (BER) of mud pulse telemetry under different signal to noise ratio (SNR) based on on-off keying (OOK) modulation scheme. By observing the effect of waveform error on BER, the allowed variation ranges in signal amplitude and period are obtained.

scholarly journals Area-Efficient Early-Termination Technique for Belief-Propagation Polar Decoders

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1001
Author(s):  
Choi ◽  
Yoo
Keyword(s):  
Error Correction ◽  
Bit Error Rate ◽  
Error Rate ◽  
Belief Propagation ◽  
Early Termination ◽  
Experimental Results ◽  
Polar Codes ◽  
Termination Criterion ◽  
Area Efficient

Early-termination techniques for a belief-propagation (BP) decoder of polar codes can improve the decoding throughput by finishing a decoding iteration when an early-termination condition is satisfied. In the BP decoders, the early-termination condition plays an important role, as it affects decoding iteration savings. In this letter, an area-efficient early-termination criterion is proposed, which simplifies the previous threshold-based termination condition by completely eliminating redundant computations. According to the experimental results, the proposed structure for (1024, 512) polar codes can reduce 72.7%, 66.5%, and 59.7% of hardware resources without any degradation in the error-correction performance and decoding throughput compared to the previous threshold-based, information-BER (bit error rate)-based, and frozen-BER-based early-termination techniques, respectively.

scholarly journals Analisis Parameter Ber Dan C/N Dengan Lnb Combo Pada Teknologi Dvb-S2

2013 ◽  
Vol 5 (2) ◽  
pp. 50
Author(s):  
Wahyu Pamungkas ◽  
Eka Wahyudi ◽  
Anugrah Ahmad Fauzi
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Digital Video ◽  
Second Generation ◽  
Low Noise ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Ku Band

Instalasi antena parabola berfungsi untuk memudahkan pada saat pengarahan pointing antena ke satelit yang dituju. Permasalahan yang diketahui yaitu bagaimana perilaku parameter Bit Error Rate (BER) dan Carrier to Noise (C/N) pada LNB Combo yang menggunakan teknologi DVB-S2. Setelah instalasi antena parabola dilakukan dan sukses, maka langkah selanjutnya yaitu melakukan pointing antena. Pointing antena diarahkan pada posisi satelit yang akan dituju. Satelit yang akan dituju yaitu Palapa D menggunakan frekuensi C-Band sedangkan Ku-Band diarahkan pada satelit NSS 6. Setelah pointing selesai dilakukan maka langkah selanjutnya yaitu menghubungkan dengan Digital Video Broadcasting Satellite Second Generation (DVB-S2). DVB-S2 merupakan receiver. Parameter yang diamati yaitu parameter BER dan C/N. Parameter BER merupakan perbandingan dengan jumlah bit yang diterima secara tidak benar dengan jumlah bit informasi yang ditransmisikan pada selang waktu tertentu. Parameter C/N merupakan perbandingan nilai pada carrier yang diterima dengan nilai sinyal noise yang dihasilkan dalam suatu link. Diperlukan juga Low Noise Block (LNB) Combo yang berguna untuk mentransmisikan sinyal ke receiver. LNB yang digunakan merupakan LNB Combo, dimana dua buah frekuensi yakni C-Band dan KU-Band menjadi satu dalam sebuah LNB. Setelah melakukan pengukuran dan melihat hasil pengukuran, dapat disimpulkan bahwa LNB Combo berpengaruh pada sinyal C-Band yang dihasilkan, sinyal C-Band akan mengalami penurunan kualitas, ini dibuktikan dari hasil pengukuran yang telah dilakukan bahwa nilai parameter C/N dan BER pada Ku-Band lebih baik daripada nilai parameter C/N dan BER pada CBand. 

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