Frequency-Domain Multi-User OFDMA Fast Fading Channel Simulation in High-Mobility Scenarios

Cisek, Grzegorz; Zieliński, Tomasz P.

doi:10.1109/iswcs.2018.8491250

Cited by 2 publications

(11 citation statements)

References 22 publications

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“…It is shown that utilization of a trivial block‐fading model for frequency‐domain channel modeling leads to inaccurate results. However, the presented results prove that the interpolation of ICI proposed in Reference 26 and ISI reconstruction through Toeplitz approximation in Reference 27 improves BER/BLER prediction substantially compared to the trivial block‐fading model.…”

Section: Introductionmentioning

confidence: 63%

“…The first model being verified in this article was proposed and enhanced in references 26 as an efficient simulation method for multiuser high mobility scenarios in OFDMA systems, including 3GPP LTE and 5G NR standards. The usage of linear convolution is unnecessary due to the presence of a cyclic prefix, which is discarded at the receiver, thus carrying no processing information.…”

Section: Simulation Of Wireless Channel In Time and Frequency Domainmentioning

confidence: 99%

“…The frequency domain models are proven to be more computationally efficient in case of multiuser scenarios. Despite that some studies concerning testbeds for the C‐RAN architecture evaluation were reported, 19 the following article is the first to address the problem of efficient fading channel modeling in a process of commercial C‐RAN equipment validation using the fast frequency‐domain HIL‐based approach. Concluding the series of conference publications on the frequency‐domain channel simulation with improved accuracy 26‐28 . New details that were not published before are presented in this article.…”

Section: Introductionmentioning

confidence: 98%

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Validation of cloud‐radio access network control unit with intra‐PHY architecture: Hardware‐in‐the‐loop framework based on frequency‐domain channel models

Cisek

Zieliński

2020

Trans Emerging Tel Tech

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In this article, a signal processing framework for hardware‐in‐the‐loop (HIL) validation of the cloud‐radio access network (C‐RAN) control unit (CU) with a crosshaul intra‐PHY architecture split is evaluated. The framework is based on the assumption that data exchanged over the crosshaul interface between the lower and higher parts of the physical layer have the form of frequency‐domain orthogonal frequency division multiplexing (OFDM) subcarriers. Therefore, it is proposed to simulate the effects of a wireless fading channel directly in the frequency domain, instead of the conventionally selected time domain. This approach leads to complexity reduction of the channel simulation model by minimizing the number of required FFT/IFFT operations, at the cost of simulation accuracy in high‐mobility and high‐delay spread scenarios. Analysis of bit error ratio (BER) and block error ratio (BLER) metrics obtained using both time‐ and frequency‐domain channel models is presented in order to validate the proposal and evaluate the accuracy loss caused by the usage of nonideal frequency‐domain models. The frequency‐domain methods are compared against the conventional wide sense stationary uncorrelated scattering (WSSUS) model implementation based on the tapped delay line (TDL). It is shown that the utilization of improved frequency‐domain models instead of the block‐fading model substantially decreases the BER/BLER prediction error in specific scenarios.

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Section: Introductionmentioning

confidence: 63%

Section: Simulation Of Wireless Channel In Time and Frequency Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Validation of cloud‐radio access network control unit with intra‐PHY architecture: Hardware‐in‐the‐loop framework based on frequency‐domain channel models

Cisek

Zieliński

2020

Trans Emerging Tel Tech

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“…One application of the reported research is an area of multi-user frequency domain channel simulation. To evaluate the performance, we will use the same methodology for complexity metrics as used in [10]. Two cases are compared against the time domain TDL model.…”

Section: Application To Channel Modeling -Complexitymentioning

confidence: 99%

“…Beyond potential application to the interference cancellation, estimation and equalization, the authors see a possibility to utilize the proposed framework in the area of frequency domain channel modeling: using it together with the Fast Fourier Transform of triangular Toeplitz matrix derived in the appendix. The existing frequency domain wideband channel models do not have a possibility to incorporate the effects of ISI [9], [10]. However, it is highly desired to provide such functionality in order to extend capability of existing simulators to cover high delay spread scenarios.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Domain Modeling of OFDM Transmission with Insufficient Cyclic Prefix Using Toeplitz Matrices

Cisek

Zieliński

2018

2018 IEEE 88th Vehicular Technology Conference (VTC-Fall)

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A novel mathematical framework is proposed to model Intersymbol Interference (ISI) phenomenon in wireless communication systems based on Orthogonal Frequency Division Multiplexing (OFDM) with or without cyclic prefix. The framework is based on a new formula to calculate the Fast Fourier Transform (FFT) of a triangular Toeplitz matrix, which is derived and proven in this paper. It is shown that distortion inducted by the ISI from a given subcarrier is the most significant for the closest subcarriers and the contribution decays as the distance between subcarriers grows. According to numerical experiments, knowledge of ISI coefficients concentrated around the diagonal of Channel Frequency Response (CFR) matrix improves the receiver's error floor significantly. The potential use of the framework for real-time frequency domain channel simulation was also investigated and demonstrated to be more efficient than conventional time domain Tapped Delay Line (TDL) model when a number of simulated users is high.

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Frequency-Domain Multi-User OFDMA Fast Fading Channel Simulation in High-Mobility Scenarios

Cited by 2 publications

References 22 publications

Validation of cloud‐radio access network control unit with intra‐PHY architecture: Hardware‐in‐the‐loop framework based on frequency‐domain channel models

Validation of cloud‐radio access network control unit with intra‐PHY architecture: Hardware‐in‐the‐loop framework based on frequency‐domain channel models

Frequency-Domain Modeling of OFDM Transmission with Insufficient Cyclic Prefix Using Toeplitz Matrices

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