scholarly journals Development of a GFDM waveform with radio defined with software

2018 ◽  
Vol 1 (2) ◽  
pp. 282-292
Author(s):  
Daniel Ricardo Pérez-Riaño ◽  
Elkin Andrés Ducuara-Hernández ◽  
Luis Fernando Pedraza-Martínez
Keyword(s):  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Spectrum Analyzer ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Gnu Radio ◽  
Advantages And Disadvantages ◽  
Fifth Generation ◽  
Usrp N210

In this paper the performance of a Generalized Frequency Division Multiplexing waveform is evaluated when compared to an Orthogonal Frequency Division Multiplexing signal. For the development of the previous waveforms, the GNU radio software and the Software Defined Radio (SDR) equipment USRP N210 are used. Through a spectrum analyzer the power of both waveforms are measured and the Out-of-Band Radiation is analyzed. Then, the results obtained are compared and the advantages and disadvantages of the implementation of GFDM as a waveform within the fifth generation systems are exposed.

scholarly journals 5G F-OFDM Waveform Based Software-Defined Radio Technology

2021 ◽  
Vol 20 ◽  
pp. 68-80
Author(s):  
Dia Mohamad Ali ◽  
Zhraa Zuheir Yahya
Keyword(s):  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Hardware Implementation ◽  
Software Radio ◽  
Spectrum Efficiency ◽  
Practical Implementation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Fifth Generation ◽  
Radio Technology

Filtered-orthogonal frequency division multiplexing (F-OFDM) is a quasi-orthogonal waveform candidate for the applications of the fifth generation (5G) communication system. In this study, an F-OFDM waveform with unequal sub-band sizes is proposed to improve the spectrum efficiency (SE) of the 5G system. The proposed waveform is modeled with the Blackman window-sinc filter and is developed based on the software-defined radio (SDR) technology for practical implementation. The result shows that the F-OFDM performance of the simulation and hardware implementation is approximately the same. The SE using the proposed F-OFDM waveform is 6% and 5.8% higher than the SE using the conventional OFDM waveform under the simulation in the LabVIEW NXG simulator and under the practical use in the universal software radio peripheral (USRP) platform, respectively.

scholarly journals Pengukuran Kinerja Orthogonal Frekwency Division Multiplexing (OFDM) Pada Sbx Doughter Board Menggunakan Labview dan USRP N-210

2019 ◽  
Vol 4 (1) ◽  
pp. 64-69
Author(s):  
BB Harianto
Keyword(s):  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Data Rate ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Inter Symbol Interference

Salah satu permasalahan dalam perkembangan teknologi telekomunikasi yaitu bagaimana mencapai data rate yang besar namun dengan bandwidth yang tidak lebih besar dari bandwidth koheren kanal untuk menghindari terjadinya Inter-Symbol Interference (ISI). Salah satu solusi yang ditawarkan yaitu transmisi multi-carrier. Cara kerja transmisi multi-carrier yaitu membagi total bandwidth signal yang tersedia menjadi beberapa subcarrier-subcarrier dengan bandwidth yang sempit. Sehingga bandwith masingmasing subcarrier yang dihasilkan tersebut menjadi lebih kecil jika dibandingkan dengan bandwidth koheren kanal. Salah satu transmisi multicarrier yang terbaru yaitu Orthogonal Frequency Division Multiplexing (OFDM) dimana subcarrier-subcarrier dapat saling tegak lurus satu sama lain sehingga bendwidth yang dibutuhkan menjadi lebih efisien jika dibandingkan dengan multicarrier konvensional seperti FDM. Sistem OFDM dapat diimplementasikan pada USRP yang merupakan salah satu jenis SDR (Software Defined Radio). SDR merupakan sistem pemancar dan penerima yang menggunakan pemrosesan sinyal digital untuk coding, decoding, modulasi dan demodulasi data. USRP tersebut digunakan sebagai model pemancar dan penerima pada pengukuran kualitas unjuk kerja sistem OFDM dengan barbagai kondisi. Pengukuran ini akan membandingkan hasil performansi parameter – parameter pada frekwensi 910 MHz dan 2.4 GHz. Spesifikasi sistem OFDM yang digunakan pada penelitian ini menggunakan software Labview dan dilakukan pada lingkungan indoor pada jarak 3m dan bandwidth 1 MHz. Hasil dari implementasi dan pengukuran menunjukkan bahwa parameter yang ditunjukkan oleh frekwensi 910 MHz lebih baik dari pada nilai parameter yang ditunjukkan oleh frekwensi 2.4

scholarly journals Filtered orthogonal frequency division multiplexing for improved 5G systems

2021 ◽  
Vol 10 (4) ◽  
pp. 2079-2087
Author(s):  
Ammar A. Sahrab ◽  
Alaa Doohee Yaseen
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Human Life ◽  
Sinc Function ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Error Vector Magnitude ◽  
Band Emission ◽  
Fifth Generation ◽  
Power Spectral ◽  
High Spectral Efficiency

Wireless communications became an integrated part of the human life. Fifth generation (5G) is the modern communication which provides enhanced mobile broadband (eMBB), ultra reliable low latency communications (URLLC), and massive machine type communication (mMTC). Thus, 5G have to provide coverage to multi-numerology devices, therefore, modulation and access schemes are suggested in the literature such as cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and filtered OFDM (f-OFDM). CP-OFDM suffers from the high out of band emission which limited the multi-numerology applications. In f-OFDM, the out of band emission can be suppressed to an accepted extent such that different numerologies can be coexisting. On the other hand, f-OFDM can be more improved by using a proper filtering approach. In this paper three different filters are suggested based windowed-sinc function; Hanning, Hamming, and Blackman. Simulation results show that the proposed filters are promising for high spectral efficiency and out of band emission rejection. Furthermore, the bit error rate, error vector magnitude, and power spectral density are further improved with respect to CP-OFDM scheme but some trade-off is present. Overall, the suggested windowed-sinc filters are outperforming the traditional CP-OFDM. As a conclusion, the suggested windnowed-sinc filters have no limitations on the modulation order or the number of subcarriers utilized in the system.

scholarly journals Analyzing standard RF Waveform Designs for WPT

2021 ◽  
Author(s):  
Sumit Gautam ◽  
Sumit Kumar ◽  
Symeon Chatzinotas ◽  
Bjorn Ottersten
Keyword(s):  
Energy Harvesting ◽  
Real Time ◽  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Separation Distance ◽  
Frequency Division Multiplexing ◽  
Device Performance ◽  
Frequency Division ◽  
Wireless Power ◽  
Different Types

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind since past several decades. In this context, there has been a tremendously growing research interest in the field of wireless power transfer (WPT) using the RF regime of the electromagnetic (EM) spectrum. In this paper, we investigate the aspect of real-time energy harvesting (EH) via different types of waveform designs such as Orthogonal Frequency Division Multiplexing (OFDM), Square, Triangular, Sinusoidal, and Sawtooth. We make use of a Software Defined Radio (SDR) and a Powercast P21XXCSREVB EH module to carry out the experiments on practical device performance. Specifically, we are interested in obtaining some insights based on the comparison between the aforementioned waveform designs from the perspectives of separation distance between the USRP and P21XXCSR-EVB EH module, and power emission via USRP. Correspondingly, the demonstration of the EH is provided in terms of the above-mentioned investigation metrics, while seeking the best waveform to support WPT.

scholarly journals 5G Multi-Carrier Modulation Techniques: Prototype Filters, Power Spectral Density, and Bit Error Rate Performance

2021 ◽  
Author(s):  
Shaik Nilofer ◽  
Praveen Kumar Malik
Keyword(s):  
Wireless Communication ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Fifth Generation ◽  
Power Spectral

Abstract In recent years for fourth-generation wireless communication systems Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier modulation (MCM) has been an excellent choice. But for the fifth-generation air interface, the choice of multi-carrier modulation remains the biggest challenge. A potential multi-carrier modulation or candidate waveforms are required for the design of the physical layer. This paper highlights the merits and limitations of new candidate waveforms for fifth-generation wireless communication system. This paper mainly reviews Orthogonal frequency division multiplexing, Filtered-OFDM (F-OFDM), Universal Frequency Division Multiplexing (UFMC), Filtered Bank Multi-Carrier Modulation (FBMC), and Generalized Frequency Division Multiplexing (GFDM). This paper mainly reviews some of the comparisons of the parameters as power spectral density and bit error rate.

scholarly journals Analyzing standard RF Waveform Designs for WPT

2021 ◽  
Author(s):  
Sumit Gautam ◽  
Sumit Kumar ◽  
Symeon Chatzinotas ◽  
Bjorn Ottersten
Keyword(s):  
Energy Harvesting ◽  
Real Time ◽  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Separation Distance ◽  
Frequency Division Multiplexing ◽  
Device Performance ◽  
Frequency Division ◽  
Wireless Power ◽  
Different Types

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind since past several decades. In this context, there has been a tremendously growing research interest in the field of wireless power transfer (WPT) using the RF regime of the electromagnetic (EM) spectrum. In this paper, we investigate the aspect of real-time energy harvesting (EH) via different types of waveform designs such as Orthogonal Frequency Division Multiplexing (OFDM), Square, Triangular, Sinusoidal, and Sawtooth. We make use of a Software Defined Radio (SDR) and a Powercast P21XXCSREVB EH module to carry out the experiments on practical device performance. Specifically, we are interested in obtaining some insights based on the comparison between the aforementioned waveform designs from the perspectives of separation distance between the USRP and P21XXCSR-EVB EH module, and power emission via USRP. Correspondingly, the demonstration of the EH is provided in terms of the above-mentioned investigation metrics, while seeking the best waveform to support WPT.

scholarly journals Estimador de canal basado en sensado compresivo y LDPC para OFDM usando SDR

Ingenius ◽  
2019 ◽  
pp. 74-85
Author(s):  
Juan Paúl Inga Ortega ◽  
Anthony Yanza Verdugo ◽  
Christian Pucha Cabrera
Keyword(s):  
Software Defined Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Matching Pursuit ◽  
Compressive Sampling ◽  
Frequency Division Multiplexing ◽  
Low Density ◽  
Frequency Division ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Restriction Property

Este trabajo propone la aplicación de un estimador de canal basado en sensado compresivo (CS, del inglés Compressive Sensing) sobre un sistema que usa multiplexación por división de frecuencias ortogonales (OFDM, del inglés Orthogonal Frequency Division Multiplexing) usando dispositivos de radio definido por \emph{software} (SDR, del inglés Software Defined Radio). La aplicación de la teoría de CS se da a través del uso de algoritmos de reconstrucción dispersa como Orthogonal Matching Pursuit (OMP) y Compressive Sampling Matching Pursuit (CoSaMP) con el fin de aprovechar la naturaleza dispersa de las subportadoras piloto usadas en OFDM optimizando el ancho de banda del sistema. Además, para mejorar el rendimiento de estos algoritmos, se utiliza el concepto de la matriz de comprobación de paridad dispersa que se implementa en el despliegue de códigos de comprobación de paridad de baja densidad (LDPC, del inglés Low Density Parity Check) para obtener una matriz de sensado que mejore la propiedad de restricción isométrica (RIP, del inglés Isometric Restriction Property) perteneciente al paradigma de CS. El documento muestra el modelo implementado en los equipos SDR analizando la tasa de error de bit y la cantidad de símbolos piloto usados.

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