A symbol time compression for ICI reduction in high mobility OFDM systems

El-Bakry, Mohammed. S.; El-Shenawy, H.; Ammar, A.

doi:10.1109/icm.2017.8268816

Cited by 15 publications

(13 citation statements)

References 11 publications

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“…The Hadamard matrix represents a different Walsh code and each row or column of this matrix represents a different Walsh code. The two spreading Walsh codes are given as follows [21,22]:…”

Section: M-stc System Modelmentioning

confidence: 99%

An Effective Technique for Increasing Capacity and Improving Bandwidth in 5g Nb-Iot

Mohammed¹,

Mostafa

Ammar³

2022

SSRN Journal

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“…The Hadamard matrix represents a different Walsh code and each row or column of this matrix represents a different Walsh code. The two spreading Walsh codes are given as follows [21,22]:…”

Section: M-stc System Modelmentioning

confidence: 99%

An Effective Technique for Increasing Capacity and Improving Bandwidth in 5g Nb-Iot

Mohammed¹,

Mostafa

Ammar³

2022

SSRN Journal

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“…CP ditambahkan untuk menghindari terjadinya ISI karena CP berperan sebagai ruang penahan antara 2 simbol yang saling berurutan. Selain itu, CP mengubah konvolusi linear menjadi konvolusi cyclic, sehingga subcarrier akan tetap ortogonal dan tidak terjadi Inter Carrier Interference (ICI) [10]. Data diubah menjadi paralel to serial, masuk ke transmiter dan melewati kanal multipath fading Rayleigh mobileto-fixed Zheng Xiao II [11].…”

Section: Metodeunclassified

Estimasi Kanal Sistem OFDM pada Kanal Fading Rayleigh dengan Metode Piece-wise Linear

Hadiansyah¹

2021

COMPLETE

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Transmisi data kecepatan tinggi menjadi sorotan masyarakat saat ini karena semakin banyak masyarakat menggunakan teknologi nirkabel pita lebar untuk memenuhi kebutuhan sehari-hari. Long Term Evolution (LTE) masih menjadi teknologi eksisting yang memanfaatkan sistem Orthogonal Frequency Division Multiplexing (OFDM) sebagai solusi penghematan bandwidth. Untuk mempertahankan kualitas data dari distorsi, maka dibutuhkan teknik estimasi kanal. Dengan mengetahui hasil estimasi kanal, maka akan didapatkan solusi untuk meminimalisasi efek distorsi. Respon impuls diasumsikan berupa kanal fading Rayleigh. Estimasi kanal yang dipakai adalah metode estimasi Piece-wise Linear dengan 2 slope. Serangkaian penelitian yang bisa dilakukan setelah estimasi kanal adalah estimasi efek doppler, minimalisasi interferensi antar-simbol, dan efisiensi serta optimalisasi sistem. Dari hasil simulasi menggunakan program Matlab dengan 100 kali iterasi, dapat diambil kesimpulan bahwa semakin besar Signal to Noise Ratio (SNR), semakin kecil error yang terjadi. Nilai rata-rata error estimasi dari SNR=9-40 dB adalah 2.4%-38.2%.

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“…The STC scheme is achieved by spreading and combining process in the transmitter and the symbol time expansion (STE) process in the receiver. The spreading and combining process in the STC transmitter is achieved as in Table 1 and the block diagram of the STC transmitter as shown in Figure 1 [16,17]. The input data stream is recovered using STE process via despreading using the same code that is at the transmitter.…”

Section: Ofdm-stc Systemmentioning

confidence: 99%

“…The main contribution of this paper is improving some of challenges in wireless communication systems to follow 5G technology based of symbol time compression (STC) scheme. The STC scheme compresess OFDM symol duration into the half [16,17]. This paper will exploit the 50% compression of the symbol duration that is achieved by the STC scheme by extending the symbol duration without loss of the system throughput.…”

Section: Introductionmentioning

confidence: 99%

An efficient technique for out-of-band power reduction for the eliminated CP-STC-shaped system for 5G requirements

Afifi

Elbakry

Soliman

et al. 2020

IJECE

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The most dominant needs for the recent wireless mobile applications are higher bandwidth (BW) efficiency, higher energy efficiency higher quality of services (QOS). The main technique in 4G systems is OFDM but it suffers from some limitations such as large peak to average power ratio (PAPR), higher Out-of-Band (OOB) power radiation, and wasting bandwidth efficiency due to cyclic prefix (CP) extension. In his paper, these OFDM limitations will be reduced with low computational complexity compared to filter bank multicarriers (FBMC). The proposed scheme is based on symbol time compression (STC) for OFDM system. The proposed STC-Shaped system is achieved via interleaver-spreader and symbol shaper in the transmitter side in addition to equalization and combining processes in the receiver side. Comparative study between the proposed system and the conventional OFDM in case of additive white Gaussian noise (AWGN) and COST 207 typical multipath fading channel will be presented. The numerical results show that the proposed STC-Shaped scheme reduces OOB significantly. The proposed scheme improves BER in multipath Rayleigh fading although it is without CP. Thus, the proposed system is more robust against inter symbol interference (ISI) compared to conventional OFDM system. Also, the numerical results show that the PAPR of the proposed system is decreased significantly and also, it is derived theoretically. Also, the proposed scheme overcomes CP extension, and hence increases the bandwidth (BW) efficiency. Finally, the computational complexity for the proposed scheme is derived and it has very low complexity compared to FBMC. The system performance measurments has been fulfilled using cumulative distribution function (CDF), power spectral density (PSD) and bit error rate (BER).

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A symbol time compression for ICI reduction in high mobility OFDM systems

Cited by 15 publications

References 11 publications

An Effective Technique for Increasing Capacity and Improving Bandwidth in 5g Nb-Iot

An Effective Technique for Increasing Capacity and Improving Bandwidth in 5g Nb-Iot

Estimasi Kanal Sistem OFDM pada Kanal Fading Rayleigh dengan Metode Piece-wise Linear

An efficient technique for out-of-band power reduction for the eliminated CP-STC-shaped system for 5G requirements

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