OFDM high speed train communication systems in 5G cellular networks

Vahidi, Vahid; Saberinia, E.

doi:10.1109/ccnc.2018.8319172

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…However, OFDM transmissions have poor reliability performance in high-mobility scenarios, in which the high Doppler frequency shift can easily destroy the orthogonality between OFDM subcarriers. Although the OFDM in the 5G system adopts a larger and more flexible subcarrier spacing design, the increase in the subcarrier spacing will shorten the Cyclic Prefix (CP) and reduce the anti-multipath capability, as well as degrade the spectrum efficiency [ 6 ]. Furthermore, the channel response in a high-mobility environment presents fast time-varying and non-stationary characteristics, which greatly increase the overhead for channel estimation under the OFDM scheme.…”

Section: Introductionmentioning

confidence: 99%

Underlying Security Transmission Design for Orthogonal Time Frequency Space (OTFS) Modulation

Liang

Song

et al. 2022

Sensors

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With the aim of ensuring secure transmission in high-mobility wireless scenarios, this paper proposes a 2D permutation-aided Orthogonal Time Frequency Space (OTFS) secure transmission scheme, which uses the Gosudarstvennyi Standard (GOST) algorithm to perform disturbance control on the OTFS modulation domain. Furthermore, we develop an improved SeLective Mapping (SLM) algorithm, which can significantly improve the Peak-to-Average Power Ratio (PAPR) problem with very low complexity. In addition, we carry out the security analysis, investigating the proposed scheme’s resistance performance to a range of effective attacks. Finally, our numerical results show that our proposed transmission scheme can guarantee the underlying security property of OTFS.

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Section: Introductionmentioning

confidence: 99%

Underlying Security Transmission Design for Orthogonal Time Frequency Space (OTFS) Modulation

Liang

Song

et al. 2022

Sensors

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“…O RTHOGONAL frequency division multiplexing (OFDM) is a good candidate for wideband high speed train (HST) systems because of its efficiency and robustness to multipath propagation. Compared with conventional OFDM-based communication systems, the HST-OFDM system suffers more challenges such as larger Doppler shift due to the high speed of trains and the high carrier frequency of HST systems [1], [2]. For the high speed of train of more than 350 km/h, the large Doppler shift that causes inter-carrier interference (ICI) destroys the orthogonality between the subcarriers and degrades the HST-OFDM system [1].…”

Section: Introductionmentioning

confidence: 99%

“…Compared with conventional OFDM-based communication systems, the HST-OFDM system suffers more challenges such as larger Doppler shift due to the high speed of trains and the high carrier frequency of HST systems [1], [2]. For the high speed of train of more than 350 km/h, the large Doppler shift that causes inter-carrier interference (ICI) destroys the orthogonality between the subcarriers and degrades the HST-OFDM system [1]. To deal with the severe ICI effect, complex algorithms Therefore, the time-varying HST channel characteristics that causes the ICI effect has been neglect.…”

Section: Introductionmentioning

confidence: 99%

International Journal of Electronics and Telecommunications

Hương

Hải

2021

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The high-speed of train (HST) in combination with the high carrier frequency of HST systems leads to the severe inter carrier interference (ICI) in the HST orthogonal frequency division multiplexing (HST-OFDM) systems. To avoid the complexity in OFDM receiver design for ICI eliminations, the OFDM system parameters such as symbol duration, signal bandwidth, and the number of subcarriers should be chosen appropriately. This paper aims to propose a process of HST-OFDM system performance investigation to determine these parameters in order to enhance spectral efficiency and meet a given quality-of-service (QoS) level. The signal-to-interferenceplus-noise ratio (SINR) has been used as a figure of merit to analyze the system performance instead of signal-to-noise ratio (SNR) as most of recent research studies. Firstly, using the nonstationary geometry-based stochastic HST channel model, the SINR of each subcarrier has been derived for different speeds of the train, signal bandwidths, and number of subcarriers. Consequently, the system capacity has been formulated as the sum of all the single channel capacity from each sub-carrier. The constraints on designing HST-OFDM system parameters have been thoughtfully analyzed using the obtained expressions of SINR and capacity. Finally, by analyzing the numerical results, the system parameters can be found for the design of HST-OFDM systems under different speeds of train. The proposed process can be used to provide hints to predict performance of HST communication systems before doing further high cost implementations as hardware designs.

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“…We consider the cases of random and quasi-random traffic in the downlink of an orthogonal frequency division multiplexing (OFDM)-based cell which provides service to calls from many service-classes. OFDM is a dominant technology in 4th generation (4G) networks and can also be considered as a candidate technology in 5th generation (5G) networks [17][18][19][20][21] and in cognitive radio networks [22]. The analysis of this OFDM-based cell relies on the loss models of [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

An Analytical Framework in OFDM Wireless Networks Servicing Random or Quasi-Random Traffic

et al. 2019

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We consider the downlink of an orthogonal frequency division multiplexing (OFDM)-based cell that services calls from many service-classes. The call arrival process is random (Poisson) or quasi-random, i.e., calls are generated by an infinite or a finite number of sources, respectively. In order to determine congestion probabilities and resource utilization, we model the cell as a multirate loss model. Regarding the call admission, we consider the restricted accessibility, the bandwidth reservation (BR), and the complete sharing (CS) policies. In a system of restricted accessibility, a new call may be blocked even if resources do exist. In a BR system, subcarriers can be reserved in favor of calls of high subcarrier requirements. Finally, in a CS system, a new call is blocked due to resource unavailability. In all three policies, we show that there exist recursive formulas for the determination of the various performance measures. Based on simulation, the accuracy of the proposed formulas is found to be quite satisfactory.

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OFDM high speed train communication systems in 5G cellular networks

Cited by 17 publications

References 18 publications

Underlying Security Transmission Design for Orthogonal Time Frequency Space (OTFS) Modulation

Underlying Security Transmission Design for Orthogonal Time Frequency Space (OTFS) Modulation

International Journal of Electronics and Telecommunications

An Analytical Framework in OFDM Wireless Networks Servicing Random or Quasi-Random Traffic

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