Investigation of blind CFO estimation for GFDM system using universal software radio peripheral: theory, simulations and experiments

Valluri, Siva Prasad; Vakamulla, Venkata Mani

doi:10.1049/iet-com.2018.5867

Cited by 10 publications

(11 citation statements)

References 21 publications

(39 reference statements)

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“…Recently, the frantic task of validating the algorithms with experimental set up was made possible by using the concept of software defined radio [16]. The block diagram indicating all the steps of implementation is shown in FIGURE 10.…”

Section: B Real Time Resultsmentioning

confidence: 99%

“…The final DCO-OFDM signal is obtained by multiplying the modified data vector with the IFFT matrix. After the proposed SLM operation, an additional CP is added at the start of the block for compensating real-time channels and is transmitted using USRP [16]. More importantly, the length of CP must be larger than the channel delay spread in order to achieve single tap equalization in the receiver [17].…”

Section: A Trasmittermentioning

confidence: 99%

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A New Selective Mapping Scheme for Visible Light Systems

2020

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The huge bandwidth and immunity to electromagnetic interference make Visible Light Communication (VLC) systems as preferred technique for designing the physical layer of 5G applications. Unfortunately, the superimposition of multiple subcarriers in DC-biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) system leads to a high peak to average power ratio (PAPR). The well-accepted nondistorting PAPR reducing schemes like selective mapping (SLM) require an obligatory transmission of side information (SI) reducing the bandwidth efficiency of the system. To address these issues, a simple SI cancellation algorithm using pilots associated with channel estimation is proposed in this work. In short, the DCO-OFDM system is presented with a modified cluster architecture and each cluster is assigned with at least one pilot. Every cluster is restricted to have same phase and this idea provides the pilots to perform joint channel estimation and SI cancellation. The experimental results obtained by using Universal Software Radio Peripheral (USRP) as hardware and LabVIEW as software indicate a significant reduction in PAPR without effecting the real-time channel response. INDEX TERMS Visible light communication (VLC), DC biased optical orthogonal frequency division multiplexing (DCO-OFDM), selective mapping (SLM), and Universal software radio peripheral (USRP).

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Section: B Real Time Resultsmentioning

confidence: 99%

Section: A Trasmittermentioning

confidence: 99%

A New Selective Mapping Scheme for Visible Light Systems

2020

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“…Apart from this, we utilized Universal Software Radio Peripheral (USRP) based VLC test bed for the validation of the proposed scheme. In our previous works, we also have implemented Generalised Frequency Division Multiplexing (GFDM) based RF prototypes using USRP devices and Lab-view software platform [9]- [11]. Therefore, the proposed method also has been implemented and validated through the VLC test bed designed using USRPs hardware and Lab-view software in the present work.…”

Section: Introductionmentioning

confidence: 99%

A Tunable Energy Signal for Intensity Modulation and Direct Detection Systems: Theory, Simulations, and Experiments

et al. 2020

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In this paper, we propose a novel method to generate real signal for Visible Light Communication (VLC) systems without using traditional hermitian symmetry on the data symbols obtained using M-ary Pulse Amplitude Modulation (PAM) which is named as Auxiliary PAM (Ax-PAM). We mathematically analyse this method to generate a real signal with tunable energy using auxiliary symbols at the transmitter and the corresponding receiver. Simulation results for Bit Error Rate (BER) show better performance over conventional PAM Discrete Multi-Tone (PAM-DMT) and Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM) even under clipping distortion and also demonstrate the tunable energy for the proposed scheme. Furthermore, the proposed scheme is implemented on a VLC test bed designed using Universal Software defined Radio Peripheral (USRP). The experimental results for estimated Signal to Noise Ratio (SNR) and achieved BER for Ax-PAM outperforms PAM-DMT and ACO-OFDM.

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“…The validity of the expressions is verified under different biasing conditions and practical LED power constraints. Finally, we use Universal Software defined Radio Peripheral (USRP) to experimentally validate the CP-DCO-GFDM and compare its performance to the conventional DCO-OFDM [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Implementation of Linearly Pulse Shaped Generalised Frequency Division Multiplexing for Visible Light Communication Systems

Kishore

Vakamulla

Popoola

et al. 2020

IEEE Open J. Commun. Soc.

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In this paper, a new modulation scheme named Direct Current biased Optical Generalised Frequency Division Multiplexing (DCO-GFDM) for Visible Light Communications (VLC) is explored. The DCO-GFDM enhances spectral efficiency by slicing both grids on the time-frequency plane and uses a circularly rotating filter for pulse shaping. In the Circular Pulse shaped DCO-GFDM (CP-DCO-GFDM), Root Raised Cosine (RRC) pulse is widely employed. This destroys the orthogonality among sub-carriers and degrades the Bit Error Rate (BER) performance. Therefore, in this work, a Linearly Pulse shaped DCO-GFDM (LP-DCO-GFDM) is proposed to retain the orthogonality among the sub-carriers and simultaneously improve BER and Peak-to-Average Power Ratio (PAPR) performance. The performance of CP/LP-DCO-GFDM is studied under double sided clipping distortion that occurs at the Light Emitting Diode (LED). Presented simulation results agree well with the theoretical results. Additionally, we present an experimental validation of the LP-DCO-GFDM on a Universal Software Radio Peripherals (USRP) based VLC test bed. The experimental results, in terms of Error Vector Magnitudes (EVM)s, the received constellations, and the received spectrum in comparison with DCO-OFDM shows improved performance.

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Investigation of blind CFO estimation for GFDM system using universal software radio peripheral: theory, simulations and experiments

Cited by 10 publications

References 21 publications

A New Selective Mapping Scheme for Visible Light Systems

A New Selective Mapping Scheme for Visible Light Systems

A Tunable Energy Signal for Intensity Modulation and Direct Detection Systems: Theory, Simulations, and Experiments

Implementation of Linearly Pulse Shaped Generalised Frequency Division Multiplexing for Visible Light Communication Systems

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