Time and Frequency Synchronization with Channel Estimation for SC-FDMA Systems Over Time-Varying Channels

Doğan, Hakan; Odabasioglu, Niyazi; Karakaya, Bahattin

doi:10.1007/s11277-017-4160-0

Cited by 7 publications

(6 citation statements)

References 22 publications

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“…] because there is no change in variance with or without phase rotation. The expected values in (10) are used to analyze (8). To find CFO estimation from ( 8) and ( 9), the received signal should satisfy three conditions, they are:…”

Section: A Carrier Frequency Offset Estimationmentioning

confidence: 99%

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Receiver Design to Employ Simultaneous Wireless Information and Power Transmission with Joint CFO and Channel Estimation

et al. 2019

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Radio-frequency energy harvesting (EH) is one of the enabling technologies for the next-generation wireless communication systems. EH techniques are specifically used to improve the energy efficiency of the system. Recently, the simultaneous wireless information and power transmission (SWIPT) protocol is adapted for EH. In this paper, we design a new receiver for joint carrier frequency offset (CFO) and channel estimation on single-carrier modulations with frequency-domain equalization along with SWIPT implementation for EH by using the pilot signal. The pilot signal is a highly energized signal, which is superimposed with the information signal. The superimposed signal is used not only to transmit power for EH purposes but also to estimate the CFO and channel conditions. The receiver is designed to accommodate the strong interference levels in the channel estimation and data detection. The proposed scheme offers a flexible design method and efficient resource utilization. We validate our analytical results using simulations.

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Section: A Carrier Frequency Offset Estimationmentioning

confidence: 99%

“…Frequency errors due to CFO directly affect the performance of channel estimation and signal detection [8], [9]. There are many CFO estimation techniques proposed for OFDM schemes in [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Receiver Design to Employ Simultaneous Wireless Information and Power Transmission with Joint CFO and Channel Estimation

et al. 2019

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“…Doppler shift was also one of the other reason for CFO [ 26 ]. CFO creates frequency-related errors at the receiver, which directly affects the performance of signal detection [ 27 , 28 ]. There were many CFO estimation techniques proposed in [ 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Novel SWIPT Schemes for 5G Wireless Networks

Rajaram

Khan

Tharranetharan

et al. 2019

Sensors

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In this paper, we present a few novel simultaneous wireless information and power transfer (SWIPT) schemes that can be effectively used in various 5G wireless network implementations. First, we study the possibility of integrating distributed energy beamforming with the data rate fairness beamforming in a cooperative communication system with multiple cooperative relays and multiple destination users communicating simultaneously. We show that the system exploits significant performance gain using such a joint energy and data rate fairness beamforming scheme. Further, we propose an enhanced version of the SWIPT scheme, the energy-efficient modulation-based non-orthogonal multiple access (M-NOMA) SWIPT scheme, and observe its system efficiency in terms of more harvested energy. Finally, we consider an energy-harvesting SWIPT scheme where the channel response is estimated using the energy-harvesting signal as pilots superimposed on the information signal. For such a scheme, we compute the optimum transmit power ratio between the pilot and information signals under varying SNR conditions and improve the accuracy of the decoding process at the reception.

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“…However, they seem to give impressive results only in the case of low mobility for transmitters and receivers. 20 In Dogan et al, 21 a method for timing/frequency synchronization and channel estimation in SC-FDMA uplink is proposed for time-varying channels. Joint equalization and CFO compensation for SC-FDMA uplink is undertaken in Al-kamali et al 17 A pilot-based, semiblind equalizer for SC-FDMA is proposed in Yameogo et al 18 The equalizer works in time domain and considers a frequency selective channel.…”

Section: Introductionmentioning

confidence: 99%

“…19 A low complexity detection algorithm that makes use of the CFOs in a frequency selective block fading channel in an OFDMA uplink for developing an iterative detector is outlined in Ahmed and Zhang. 20 In Dogan et al, 21 a method for timing/frequency synchronization and channel estimation in SC-FDMA uplink is proposed for time-varying channels. However, the method does not consider a multiuser scenario.…”

Section: Introductionmentioning

confidence: 99%

Low complexity equalization techniques using interference cancellation for SC‐FDMA uplink systems under doubly selective channels

Muneer

Al-Rayif

Ijyas

2018

Int J Communication

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This paper addresses the important and challenging issue of joint equalization of carrier frequency offsets (CFOs), timing offsets, and doubly selective channels (DSCs) of multiple users in a SC-FDMA uplink. Low complexity, iterative equalizer solutions are proposed, which give impressive performance under rapidly varying channel conditions. We propose three different equalization schemes that make use of iterative interference cancellation technique named as iterative equalizer with interference cancellation (IEIC), iterative equalizer with interference cancellation and decoding (IEICD), and simplified iterative equalizer with interference cancellation and decoding (SIEICD). The SIEICD method proposed is a simplified version of the IEICD, and it makes use of the only significant elements in the receive signal model in the matrix form. The superior performance of the methods in high mobility conditions with several users is amply demonstrated through extensive simulation studies. KEYWORDS equalization over DSC, joint equalization, single carrier frequency division multiple access SC-FDMA uplink, time and frequency selective channel Abbreviations: IEIC, iterative equalizer with interference cancellation; IEICD, iterative equalizer with interference cancellation; SC-FDMA, single carrier frequency division multiple access; SIEICD, simplified iterative equalizer with interference cancellation. Int J Commun Syst. 2018;31:e3819.wileyonlinelibrary.com/journal/dac

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Time and Frequency Synchronization with Channel Estimation for SC-FDMA Systems Over Time-Varying Channels

Cited by 7 publications

References 22 publications

Receiver Design to Employ Simultaneous Wireless Information and Power Transmission with Joint CFO and Channel Estimation

Receiver Design to Employ Simultaneous Wireless Information and Power Transmission with Joint CFO and Channel Estimation

Novel SWIPT Schemes for 5G Wireless Networks

Low complexity equalization techniques using interference cancellation for SC‐FDMA uplink systems under doubly selective channels

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