Adaptive OFDM With Index Modulation for Two-Hop Relay-Assisted Networks

Dang, Shuping; Coon, Justin P.; Chen, Gaojie

doi:10.1109/twc.2017.2787056

Cited by 62 publications

(70 citation statements)

References 43 publications

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“…As shown in Table I, the equal probable bit sequence enables easier detection and designs of higher layer protocols unlike the dual-mode transmission protocol [27], where the modulation has been employed on a bit sequence with variable length. Control signaling is not required in [28] unlike the method in [30] where always-active control subcarrier has been used for control signaling transmission.…”

Section: A Ofdm-hnim Receivermentioning

confidence: 99%

OFDM With Hybrid Number and Index Modulation

2020

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A novel transmission scheme is introduced for efficient data transmission by conveying additional information bits through jointly changing the index and number of active subcarriers within each orthogonal frequency division multiplexing (OFDM) subblock. The proposed scheme is different from the conventional OFDM-subcarrier number modulation (OFDM-SNM) and OFDM-index modulation (OFDM-IM), in which data bits are transmitted using either number or index of active subcarriers. The proposed modulation technique offers superior spectral and energy efficiency compared to its counterparts OFDM-SNM and OFDM-IM, especially at low modulation orders such as binary phase shift keying (BPSK) that can provide high reliability and low complexity, making it suitable for Internet of Things (IoT) applications that require better spectral and energy efficiency while enjoying high reliability and low complexity. Bit error rate (BER) performance analysis is provided for the proposed scheme, and Monte Carlo simulations are presented to prove the consistency of simulated BER with the analyzed one.A. M. Jaradat is with

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Section: A Ofdm-hnim Receivermentioning

confidence: 99%

OFDM With Hybrid Number and Index Modulation

2020

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“…Subsequently, we resort to (14) to yield the bijective mapping relation between the six SAPs and the six leaves in Table II. By observing this table, we find that the two most preferable SAPs represented by v 1 and v 2 are activated with higher probabilities than the other SAPs.…”

Section: Enhanced Huffman Coding With Csimentioning

confidence: 99%

“…over {G n (ξ n )} N n=1 when the allocated power for active subcarriers is independent of H, which yields(23), where (a) follows from by the independence among subcarriers and Γ( ) = ∞ 0 u −1 exp(−u)du is the complete gamma function. Substituting(23) into(17) gives the approximate BLER when x(s, m) is transmitted.Finally, according to(6),(14) and the Huffman encoding rules, it is evident that there exist M K legitimate OFDM blocks adopting the same SAP. Hence, it is straightforward to explicitly express the average BLER asPe = 1 M K x(s,m)∈X p(s)P e (x(s, m)).(24)V.…”

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confidence: 99%

Enhanced Huffman Coded OFDM With Index Modulation

Dang

Guo

Coon

et al. 2020

IEEE Trans. Wireless Commun.

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In this paper, we propose an enhanced Huffman coded orthogonal frequency-division multiplexing with index modulation (EHC-OFDM-IM) scheme. The proposed scheme is capable of utilizing all legitimate subcarrier activation patterns (SAPs) and adapting the bijective mapping relation between SAPs and leaves on a given Huffman tree according to channel state information (CSI). As a result, a dynamic codebook update mechanism is obtained, which can provide more reliable transmissions.We take the average block error rate (BLER) as the performance evaluation metric and approximate it in closed form when the transmit power allocated to each subcarrier is independent of channel states.Also, we propose two CSI-based power allocation schemes with different requirements for computational complexity to further improve the error performance. Subsequently, we carry out numerical simulations to corroborate the error performance analysis and the proposed dynamic power allocation schemes. By studying the numerical results, we find that the depth of the Huffman tree has a significant impact on the error performance when the SAP-to-leaf mapping relation is optimized based on CSI. Meanwhile, through numerical results, we also discuss the trade-off between error performance and data transmission rate and investigate the impacts of imperfect CSI on the error performance of EHC-OFDM-IM.Orthogonal frequency-division multiplexing with index modulation (OFDM-IM), Huffman coding, dynamic codebook design, power allocation, channel state information (CSI).both provide good thoughts on how the Huffman tree architecture could be adapted to provide a higher capacity and transmission rate when utilizing all legitimate SAPs. In [25], Huffman coding was applied to OFDM-IM with the help of channel state information (CSI). However, the Huffman coded OFDM-IM scheme proposed in [25] did not fully exploit all legitimate SAPs, and thereby only shows limited improvements. The latest research results with respect to the optimization of the achievable rate of binary-tree coded OFDM-IM (a generic version of Huffman coded OFDM-IM) were presented in [26]. In this work, the achievable rate is optimized by dynamically varying the SAP probability distribution and transmit power allocated to active subcarriers. January 7, 2020 DRAFT

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“…This aligns with the practical scenarios of the IoT with stationary MTDs, which are subject to slow fading and supported by proper power supply 5 . Owing to the slow fading assumption, the signaling overheads rendered by performing subcarrier assignment and codebook feedforward to the receiver for detection purposes become negligible [21], [37].…”

Section: Channel Modelmentioning

confidence: 99%

Enhanced Orthogonal Frequency-Division Multiplexing With Subcarrier Number Modulation

Dang

Shihada

et al. 2019

IEEE Internet Things J.

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A novel modulation scheme termed orthogonal frequency-division multiplexing with subcarrier number modulation (OFDM-SNM) has been proposed and regarded as one of the promising candidate modulation schemes for next generation networks. Although OFDM-SNM is capable of having a higher spectral efficiency (SE) than OFDM with index modulation (OFDM-IM) and plain OFDM under certain conditions, its reliability is relatively inferior to these existing schemes, because the number of active subcarriers varies. In this regard, we propose an enhanced OFDM-SNM scheme in this paper, which utilizes the flexibility of placing subcarriers to harvest a coding gain in the high signal-to-noise ratio (SNR) region. In particular, we stipulate a methodology that optimizes the subcarrier activation pattern (SAP) by subcarrier assignment using instantaneous channel state information (CSI) and therefore the subcarriers with higher channel power gains will be granted the priority to be activated, given the number of subcarriers is fixed. We also analyze the proposed enhanced OFDM-SNM system in terms of outage and error performance. The average outage probability and block error rate (BLER) are derived and approximated in closed-form expressions, which are further verified by numerical results generated by Monte Carlo simulations. The high-reliability nature of the enhanced OFDM-SNM makes it a promising candidate for implementing in the Internet of Things (IoT) with stationary machine-type devices (MTDs), which are subject to slow fading and supported by proper power supply.Index Terms-Orthogonal frequency-division multiplexing with subcarrier number modulation (OFDM-SNM), subcarrier assignment, reliability enhancement, outage performance analysis, error performance analysis.

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Adaptive OFDM With Index Modulation for Two-Hop Relay-Assisted Networks

Cited by 62 publications

References 43 publications

OFDM With Hybrid Number and Index Modulation

OFDM With Hybrid Number and Index Modulation

Enhanced Huffman Coded OFDM With Index Modulation

Enhanced Orthogonal Frequency-Division Multiplexing With Subcarrier Number Modulation

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