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LTE Quality of Service Enhancement Under OFDM Modulation Techniques

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Abstract

Recently, to satisfy the ever-growing data needs, Long Term Evolution (LTE) has been deployed by many operators. LTE enables better spectrum management and avoids the adjacent channel interference by using the Orthogonal Frequency Division Multiple Access (OFDMA) for downlink and Single Carrier Frequency Division Multiple Access (SC-FDMA) for uplink connection. Even though the spectrum is limited, the number of active devices is increasing which requires the need for extra spectrum. OFDM is capable of better Quality of Service (QoS) as it avoids the multipath fading using equalization and immune to inter-symbol interference, in addition to its attractive spectral efficiency. However, the LTE system is suffered from Peak to Average Power Ratio (PAPR) which reduces the QoS of the communication. Therefore, in this paper, we have proposed a QoS enhancement using a hybridized clipping-selective mapping (Clip-SLM) technique. Different QoS enhancement methods are evaluated for different modulation techniques, phase sequences, and number of sub-carriers. From the simulation results, we have shown that the proposed hybridized technique results in significant PAPR reduction which results in substantial Bit Error Rate (BER) reduction and hence QoS enhancement.

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Abbreviations

BER:

Bit error rate

CCDF:

Complementary CDF

Clip-SLM:

Clipping-selective mapping

LTE:

Term evolution

OFDMA:

Orthogonal frequency division multiple access

PAPR:

Peak to average power ratio

PAs:

Power amplifiers

PDF:

Probability density function

QAM:

Quadrature amplitude modulation

QoS:

Quality of Service

QPSK:

Quadrature phase shift keying

SC-FDMA:

Single carrier frequency division multiple access

SLM:

Selective mapping

SNR:

Signal to noise ratio

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Funding

The research was not funded.

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Authors and Affiliations

  1. School of Electrical and Computer Engineering, Mekelle University, Mekelle, Ethiopia

    Gebrehiwet Gebrekrstos Lema, Teklehaymanot Baweke Reda & Dawit Hadush Hailu

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  1. Gebrehiwet Gebrekrstos Lema
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  2. Teklehaymanot Baweke Reda
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  3. Dawit Hadush Hailu
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Contributions

Gebrehiwet Gebrekrstos Lema has coordinated, summarized, carried out in the sequence alignment and drafted the manuscript. He has also conceived and designed the study and he has performed the statistical analysis.

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Correspondence to Gebrehiwet Gebrekrstos Lema.

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Lema, G.G., Reda, T.B. & Hailu, D.H. LTE Quality of Service Enhancement Under OFDM Modulation Techniques. Wireless Pers Commun 113, 995–1008 (2020). https://doi.org/10.1007/s11277-020-07264-8

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  • DOI: https://doi.org/10.1007/s11277-020-07264-8

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