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Table Of Integrals Series And Products

Estimation of the Parameters of the K-distributed Using Higher Order and Fractional Moments

Spectral efﬁciency (SE) and energy efﬁciency (EE) play major roles in evaluating the quality of service (QoS) of a wireless communication system. Designing an efﬁcient wireless communication system requires trade-off between these two parameters. Orthogonal frequency division multiplexing technique with Index Modulation (OFDM-IM) has been introduced in the literature to increase the SE compared to traditional OFDM. In this paper, an adaptive technique with OFDM-IM is introduced in an M-QAM based scheme to maintain a guaranteed level of average bit error probability (ABEP) with enhanced SE. It has been demonstrated that by adaptively varying the number of active subcarriers and modulation levels in M-QAM scheme, maximum EE can also be achieved for an acceptable ABEP. The closed-form expressions of ABEP and pairwise error probability (PEP) for OFDM-IM with M-ary QAM modulation are derived and examined over the composite Nakagami-m Gamma (NG) fading channel model using greedy detection (GD). In addition, the performance of adaptive OFDM-IM with M-QAM Modulation scheme is evaluated in terms of efﬁciency metrics, outage probability, and ABEP. The obtained results show that the adaptive scheme offers high potential for accomplishing signiﬁcant improvement in SE and EE while maintaining acceptable ABEP even under severe channel impairment.

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Adaptive OFDM-IM System Over Faded Shadowing Channel

The growing usage of wireless services is lacking in providing high-speed data communication in recent times. Hence, many of the modulation techniques are evolved to attain these communication needs. The recent researches have widely considered OFDM technology as the prominent modulation mechanism to fulfill the futuristic needs of wireless communication. The OFDM can bring effective usage of resources, bandwidth, and system performance enhancement in collaboration with the smart antenna and resource allocation mechanism (adaptive). However, the usage of adaptive beamforming with the OFDM leads to complication in the design of medium access layer and which causes a problem in adaptive resource allocation mechanism (ARAM). Hence, the proposed manuscript intends to design an OFDM system by considering different switched beam smart antenna (SBSA) along with the cross-layer adaptive resource allocation (CLARA) and hybrid adaptive array (HAA). In this, various smart antenna mechanism are considered to analyze the quality of service (QoS) and complexity reduction in the OFDM system. In this paper, various SA schemes are used as per the quality of service (QoS) requirement of the different users. The performance analysis is conducted by considering data traffic reduction, bit-rate reduction, and average delay.

/pdf/cl-sa-ofdm-cross-layer-and-smart-antenna-based-ofdm-system-5t4doi5zn6.pdf

CL-SA-OFDM: Cross-layer and smart antenna based OFDM system performance enhancement

In OFDM-IM scheme, the maximum likelihood (ML) detector becomes impractical for large number of active subcarrier index combinations and active subcarriers due to the exponentially growing decoding complexity. In this paper, a simple and low complexity GD-HL (greedy detection-hard limiting) detector based on greedy detection and hard-limiting idea is proposed. The computational complexity and the BER performance of GD-HL detector are analyzed. Computer simulation results demonstrate that the BER of GD-HL detector can approach, even reach the performance of optimal ML detector in the case of high-order modulation. The analysis show that the decoding complexity of the GD-HL is much lower and it doesn’t grow with the increase of modulation order. These features make it more beneficial for OFDM-IM systems competing different channel conditions.

Simple and Low Complexity GD-HL Detector for OFDM-IM

Recently, Orthogonal Frequency Division Multiplexing with Index Modulation (OFDM-IM) has been introduced as a novel multi-carrier system to carry additional information bits compared to conventional OFDM. In this paper, we provide a closed-form expression of an OFDM-IM system for M-ary signal constellations such as M - QAM and M - PSK modulation schemes over a Nakagami-m fading channel. Simulation results illustrate that OFDM-IM improves system performance in high data-rate transmission over conventional OFDM under various Nakagami fading factor m.

On the performance of OFDM Index Modulation over Nakagami fading channels

The performance of a low-complexity detection technique for OFDM-IM over the Nakagami-m fading channel has been analyzed. The orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has recently been used in conjunction with the subcarriers using on-off keying modulation. The result shows improved performance in comparison with the conventional OFDM. The closed-form expression for the average pairwise error probability (PEP) over the Nakagami-m fading channel is derived.

Performance analysis of a low-complexity detection for OFDM Index Modulation over Nakagami-m fading

Air traffic and on-board data access services are expected to have tremendous growth, possibly even exponentially in the near future. In order to meet these challenges, Orthogonal Frequency Division Multiplexing (OFDM) can be deployed to enable the increased usage of broadband services on-board. The Doppler effect is one of the major issues in implementing OFDM modulation in aeronautical satellite communication systems since the received carrier frequency shifts and Doppler spread result in inter-carrier interference (ICI). In this paper, we evaluate the Doppler frequency estimation using the parametric method, and Angle of Arrival technique (AoA) to reduce the impact of Doppler on system performance. A model of an aeronautical satellite channel is presented for the evaluation. The MUSIC, Eigenvector and Minimum Norm algorithms are used to estimate the sub-carriers' shift of the received OFDM symbol. We found that both the parametric method and Angle of arrival estimation can be combined as potential approach to reduce the effect of ICI in the aeronautical satellite environment.

Doppler estimation for aeronautical satellite OFDM system

Orthogonal frequency division multiplexing with Index Modulation (OFDM-IM) has been utilized to transmit extra bits by indexing subcarriers using the ON-OFF keying modulation. In this paper, the performance of the OFDM-IM system is studied in terms of bit error probability, over a composite Nakagami-m Gamma (NG) shadowed fading channel. The closed form expressions of approximate and exact average BEP (ABEP) of M-ary QAM modulation and pairwise error probability (PEP) are derived for OFDM-IM over the aforementioned channel. The theoretical results are compared with existing research studies and verified using simulation.

Ibrahim Aboharba

Papers

On the performance of OFDM Index Modulation over Nakagami fading channels

Performance analysis of a low-complexity detection for OFDM Index Modulation over Nakagami-m fading

Adaptive OFDM-IM System Over Faded Shadowing Channel

Doppler estimation for aeronautical satellite OFDM system

Bit Error Probability Analysis for OFDM-IM over Faded Shadowing Channel