Multiple Access Interference-Free Multichannel Slotted Aloha Scheme for Time-Asynchronous OFDMA Systems

Jung, Junwoo; Lim, Jaesung; Kang, Haengik; Park, Hyoungwon

doi:10.1587/transcom.e98.b.686

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…In Figure 2c, we show the example of a CSM-based FH pattern for K C = 3000, r x = 1, r y = 3 and seed number α = 2. The users, k = 1, 2, and 5 are assigned their CSM-based FH patterns as {C 1 4,x (j), C 1 4,y (j)}={(5, 5), (3,4), (1, 1), (4, 1), (2, 1)}, {C 2 4,x (j), C 2 4,y (j)} = {(3, 3), (1,5), (4,5), (2,5), (5, 4)}, and {C 5 4,x (j), C 5 4,y (j)} = {(2, 2), (5, 1), (3,5), (1,2), (4, 2)} for j = 1, . .…”

Section: Fh Patterns For Fh-ofdma Systemmentioning

confidence: 99%

“…Frequency hopping-orthogonal frequency division multiple access (FH-OFDMA) can provide low probability of detection (LPD) and anti-jamming capabilities to authenticated users against adversaries for secure multimedia and military communication services [1]. In the OFDMA system, the entire frequency spectrum is divided into multiple narrow-band subcarriers, which are then assigned to multiple users to transmit data symbols on different subcarriers simultaneously [2]. In the FH-OFDMA system, the total number of subcarriers is partitioned into a set of clusters composed of contiguous subcarriers, and each cluster is changed to a different frequency during each period based on the FH pattern.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Low Probability of Detection Capability for Chaotic Standard Map-Based FH-OFDMA System

Jung¹,

Lim

Park³

et al. 2021

Applied Sciences

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A frequency hopping orthogonal frequency division multiple access (FH-OFDMA) can provide low probability of detection (LPD) and anti-jamming capabilities to users against adversary detectors. To obtain an extreme LPD capability that cannot be provided by the basic symbol-by-symbol (SBS)-based FH pattern, we proposed two FH patterns, namely chaotic standard map (CSM) and cat map for FH-OFDMA systems. In our previous work, through analysis of complexity to regenerate the transmitted symbol sequence, at the point of adversary detectors, we found that the CSM had a lower probability of intercept than the cat map and SBS. It is possible when a detector already knows symbol and frame structures, and the detector has been synchronized to the FH-OFDMA system. Unlike the previous work, here, we analyze whether the CSM provides greater LPD capability than the cat map and SBS by detection probability using spectrum sensing technique. We analyze the detection probability of the CSM and provide detection probabilities of the cat map and SBS compared to the CSM. Based on our analysis of the detection probability and numerical results, it is evident that the CSM provides greater LPD capability than both the cat map and SBS-based FH-OFDMA systems.

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Section: Fh Patterns For Fh-ofdma Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Low Probability of Detection Capability for Chaotic Standard Map-Based FH-OFDMA System

Jung¹,

Lim

Park³

et al. 2021

Applied Sciences

Self Cite

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“…OFDMA is a multiple access technique based on orthogonal frequency division multiplexing (OFDM) [4]. In OFDMA systems, CFOs not only cause the loss of orthogonality among the carriers, which leads to inter‐carrier interference (ICI), but also influence the different users in this system, as multiple‐access interferences (MAI) [5,6]. Hence, frequency synchronization is an important task to prevent degradation in system performance.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Carrier Frequency Offset Estimation in Interference Environments for OFDMA Uplink Systems

Cheng,

Chen,

Wang

et al. 2023

IEEJ Transactions Elec Engng

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In orthogonal frequency division multiple access (OFDMA) systems, carrier frequency offsets (CFOs) influence the different users. In this paper, we proposed a CFO estimation algorithm with strong interference resistant capability for OFDMA systems. The first part of the proposed algorithm processes the received signals so as to deal with the CFO estimation problem. And the second part of the proposed algorithm is to use the proposed adaptive process to obtain the updated CFO estimation and track the parameters' time‐variations. Simulations demonstrate the effectiveness of this method and show that its performance is to the Cramer‐Rao Bounds (CRB). © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Multiple Access Interference-Free Multichannel Slotted Aloha Scheme for Time-Asynchronous OFDMA Systems

Cited by 2 publications

References 31 publications

Analysis of Low Probability of Detection Capability for Chaotic Standard Map-Based FH-OFDMA System

Analysis of Low Probability of Detection Capability for Chaotic Standard Map-Based FH-OFDMA System

Adaptive Carrier Frequency Offset Estimation in Interference Environments for OFDMA Uplink Systems

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