Analysis of OFDM systems for high bandwidth application

In this paper, the higher modulation formats (128 and 256) Quadrature Amplitude Modulation (QAM), for modulation/demodulation the digital signal of the currently used Orthogonal Frequency Division Multiplexing (OFDM) system, is proposed, explored and evaluated at a wireless transmission system. The proposed modulation schemes are utilized to study the impact of adding extra bits for each transmitted sample on system performance in terms of the channel capacity, Bit Error Rate (BER) and Signal to Noise Ratio (SNR). As such, the key purpose of this research is to identify the advantages and disadvantages of using higher modulation schemes on the physical layer (PHY) of future mobile networks. In addition, the trade-off relation between the achieved bit rate and the required power of the receiver is examined in the presence of the Additive White Gaussian Noise (AWGN) and Rayleigh noise channels. Besides, the currently employed waveform (OFDM) is considered herein as an essential environment to test the effect of receiving additional complex numbers on the constellations table. Thus, investigate the ability to recognize both the phase and amplitude of intended constellations for the upcoming design of wireless transceivers. Moreover, a MATLAB simulation is employed to evaluate the proposed system mathematically and physically in an electrical back-to-back transmission system.

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“…Besides, different values of received powers have been tested exploring how the optimal value of the SNR was achieved [16].…”

Section: Literature Reviewmentioning

confidence: 99%

Impact Study and Evaluation of Higher Modulation Schemes on Physical Layer of Upcoming Wireless Mobile Networks

Haboobi

Kadhum²

2019

IJACSA

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“…It has been analyzed in the system that, OFDM utilized high power amplifier to obtain sufficient power for the transmission. But utilization of QAM enhances the consumption of power, as QAM uses amplitude component of signal to represent binary data, linearity needs to be maintained and hence linear amplifier is needed which consumes more power [9].…”

Section: K Nagarajan Et Al Ieee Proposed a Technique Thatmentioning

confidence: 99%

“…where N is the total number of subcarriers, K is the overlapping factor and is mapped from the aforementioned coefficients, where p0 = 1, p±1 = 0.97196, p±2 = 0.707 and p±3 = 0.235147. Then, its impulse response pT (t) can be obtained by an inverse Fourier transform, as follows: (15) The above algorithm is used to implement the preprocessing unit of FBMC by utilizing the APSK modulation technique for the subcarriers. Similarly, the postprocessing has been inversely executed to obtain the transmitted signal.…”

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confidence: 99%

Augmentation of Spectral Efficiency using APSK in FBMC to Assess High Data Rate

Rai¹,

Vyas²

2019

IJRTE

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There are various techniques which have been developed to improvise the modulation technique exploited in the system which were intended to enhance the data rate and bandwidth of the 5G network. Various researchers worked on OFDM modulation technique in order to enhance the efficiency as it is successfully working on 4G networks. Although utilization of OFDM in 5G networks will not provide the expected outcomes due to some flaws. This paper proposed a system that induced FBMC (Filter Bank Multi-Carrier) modulation technique which is capable of delivering higher spectral efficiency than OFDM. Proposed method employed APSK (Amplitude Phase Shift Modulation) for the modulation of sub carriers. The idea of implementing APSK in FBMC is to optimize the peak to average power ratio and also reduces bit error rate. The techniques proposed in the system, aimed to achieve high efficiency in terms of data rate and bandwidth with less power consumption. By using MATLAB all the simulations will be performed to analyze the results of spectral efficiency in terms of BER vs Eb/No (SNR) and power spectral density.

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“…The increased growth of transmission data over mobile networks considers as an essential driving force for proposing higher modulation formats [1]. Hence, the growing demand for higher bit-rate is requesting a well exploiting for modulation formats in the utilised waveform.…”

Section: Introductionmentioning

confidence: 99%

Utilise Higher Modulation Formats with Heterogeneous Mobile Networks Increases Wireless Channel Transmission

Haboobi

Kadhum

2019

Advances in Intelligent Systems and Computing

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In this paper, a higher modulation format with a heterogeneous mobile network (small cells, Macrocells) is proposed, explored and evaluated at a wireless transmission system. As such, study the effect of utilising developed schemes of modulation like the 256 Quadrature Amplitude Modulation (QAM) on the modulation/de-modulation level of the currently applied Orthogonal Frequency Division Multiplexing (OFDM). Since the higher bit-rate of transmission is one of the important topics for the forthcoming generation of mobile, the introduced system aims to regulate the trade-off relationship between the maximum achieved bit-rate and the minimum required level of the Signal-to-Noise Ratio (SNR). Hence, involve the small cell technology as a supportive tool for the higher schemes of modulation to increase the capacity of the channel at the accepted limit of error. Consequently, the presented system that combines both the higher modulation formats and the small cells can expand the transmission coverage with a higher bit-rate yet keeping a similar level of the received power. Moreover, the system performance in terms of the maximum bit-rate and the Bit Error Rate (BER) is investigated in the presence of the Additive White Gaussian Noise (AWGN) channel model. Also, the OFDM waveform is considered herein as an accommodating environment to examine the activity of the intended modulation techniques due to its' efficiency in using the available Bandwidth (BW). Furthermore, a MATLAB simulation is used to implement the promoted system and clarify the advantages and disadvantages of it in comparison with the currently applied 64 QAM.

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Analysis of OFDM systems for high bandwidth application

Cited by 4 publications

References 9 publications

Impact Study and Evaluation of Higher Modulation Schemes on Physical Layer of Upcoming Wireless Mobile Networks

Impact Study and Evaluation of Higher Modulation Schemes on Physical Layer of Upcoming Wireless Mobile Networks

Augmentation of Spectral Efficiency using APSK in FBMC to Assess High Data Rate

Utilise Higher Modulation Formats with Heterogeneous Mobile Networks Increases Wireless Channel Transmission

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