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On the optimal solution for BER performance improvement in dual-hop OFDM relay systems
2014
2014 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)
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Through these comparisons, an optimal solution for BER performance improvement in the given channels' conditions, is defined. ...
In this paper bit error rate (BER) performance of DPSK modulated dual-hop OFDM based relay systems implementing ordered subcarrier mapping (SCM) at relay station (R) is analyzed. ...
worst subcarriers, represents the optimal solution for BER performance improvement in dual-hop OFDM based relay systems. ...
doi:10.1109/wcncw.2014.6934899
dblp:conf/wcnc/KocanPK20
fatcat:cgj22y5f6rbpxfjwkf2inab2gq
New solution for BER performance improvement of OFDM AF relay systems
2012
2012 20th Telecommunications Forum (TELFOR)
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Dual-hop OFDM amplify-and-forward (AF) variable gain (VG) relay systems may improve bit error rate (BER) performance if ordered subcarrier mapping (SCM) is applied at the relay station (R). ...
In this paper we propose new solution, where in the assumed relay system with BTB SCM the subcarriers having the lowest SNR on each hop are omitted. ...
Thus, it can be recognized as the optimal solution for BER performance improvement of the analyzed OFDM AF VG relay system. ...
doi:10.1109/telfor.2012.6419234
fatcat:lqsbhanos5c6xjzsgkxh6w64q4
Toward Spectral and Energy Efficient 5G Networks Using Relayed OFDM With Index Modulation
2021
Frontiers in Communications and Networks
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Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) stands out as a promising solution to satisfy the SE requirement with a reasonable increase in system complexity. ...
Moreover, diversity gain is difficult to harvest from the frequency domain without affecting the SE for OFDM-IM systems, which hinders further reliability enhancement. ...
Besides, as there exists a performance trade-off in the number of hops L, how many hops should be involved for one complete transmission by relay-assisted OFDM-IM is still an open optimization problem. ...
doi:10.3389/frcmn.2021.635295
fatcat:lltx75wctfbsbeqerz7jep4yuq
Toward Spectral and Energy Efficient 5G Networks Using Relayed OFDM with Index Modulation
[article]
2019
arXiv
pre-print
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Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) stands out as a promising solution to satisfy the SE requirement with a reasonable increase in system complexity. ...
However, the EE of OFDM-IM is still required to be enhanced. Moreover, diversity gain is hardly harvested in OFDM-IM systems, which hinders further reliability enhancement. ...
Besides, as there exists a performance trade-off in the number of hops L, how many hops should be involved for one complete transmission by relay assisted OFDM-IM is still an open optimization problem. ...
arXiv:1904.04530v1
fatcat:udk2rlp35jc2bafq35fvdesine
Transceiver Design for Dual-Hop Nonregenerative MIMO-OFDM Relay Systems Under Channel Uncertainties
2010
IEEE Transactions on Signal Processing
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In this paper, linear transceiver design for dual-hop non-regenerative (amplify-and-forward (AF)) MIMO-OFDM systems under channel estimation errors is investigated. ...
Second order moments of channel estimation errors in the two hops are first deduced. ...
Furthermore, the linear MMSE transceiver design for dual hop MIMO-OFDM relay systems based on prefect channel state information (CSI) is proposed in [20] . ...
doi:10.1109/tsp.2010.2070797
fatcat:umgi7ndgyfhojl5wgnby2ozpq4
Index Modulation Aided Subcarrier Mapping for Dual-Hop OFDM Relaying
2019
IEEE Transactions on Communications
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Among those, subcarrier mapping has been verified to be an effective one for boosting the system capacity and improving the error performance. ...
There is a recent surge of research interest in the study of performance-enhancing techniques for orthogonal frequency division multiplexing (OFDM)-based relay systems. ...
to that of dual-hop OFDM systems with ideal SCM. ...
doi:10.1109/tcomm.2019.2920642
fatcat:ztl25ofvuza6rfz6xeos5z5fde
Performance Evaluation of OFDM Amplify-and-Forward Relay System with Subcarrier Permutation
2010
IEICE transactions on communications
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Thus, it could be concluded that OFDM AF relaying systems may switch from the BTB SCP to BTW SCP in order to achieve optimum BER performance. ...
We perform error probability analysis of the uncoded OFDM fixed gain Amplify-and-Forward (AF) relaying system with subcarrier permutation (SCP). ...
The authors would also like to thank the anonymous reviewers for their valuable suggestions and comments. ...
doi:10.1587/transcom.e93.b.1216
fatcat:b63csdukybhazowluxtc3kxkni
BER performance of OFDM Amplify-and-Forward relaying system with subcarrier permutation
2009
2009 1st International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology
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Thus, it could be concluded that OFDM AF relaying systems may switch from the BTB SCP to BTW SCP in order to achieve optimum BER performance. ...
We perform error probability analysis of the uncoded OFDM xed gain Amplify-and-Forward (AF) relaying system with subcarrier permutation (SCP). ...
By employing majorization theory the authors in [10] proved that the BER performance of the dual-hop OFDM variable gain AF relay system in the medium and high SNR regions can be improved by using the ...
doi:10.1109/wirelessvitae.2009.5172459
fatcat:b5jkywl77zd7rkok3xxd6cguee
A Joint Resource Allocation Scheme for Relay Enhanced Multi-cell Orthogonal Frequency Division Multiple Networks
2013
KSII Transactions on Internet and Information Systems
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This paper formulates resource allocation for decode-and-forward (DF) relay assisted multi-cell orthogonal frequency division multiple (OFDM) networks as an optimization problem taking into account of ...
Subsequently, with the aid of dual decomposition, water-filling theorem and iterative power allocation algorithm the optimal solution of the original problem can be got with acceptable complexity. ...
improve system performance. ...
doi:10.3837/tiis.2013.02.007
fatcat:mqola5xe5zhdzmmmpwekym4xyi
Resource allocation in decode-and-forward relaying systems based on OFDM
2012
20th Iranian Conference on Electrical Engineering (ICEE2012)
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In this paper, we investigate resource allocation algorithms for Orthogonal Frequency Division Multiplexing (OFDM) based dual hop systems including a source, multiple relays, and multiple destinations ...
The first subproblem is to solve the optimization problem for a given value of transmission time used by each hop, and the second subproblem is to compute the value of transmission time. ...
t e . c o m The contribution of this paper is to formulate the optimization of power and transmission time used by each hop in the downlink of dual-hop OFDM relaying systems. ...
doi:10.1109/iraniancee.2012.6292511
fatcat:x3cjvnf4pbcefastkgswryzfia
OFDM Communication with Cooperative Relays
[chapter]
2010
Communications and Networking
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Thus, this AF relay should be removed according to the proposed dynamic optimal combination strategy to improve the transmission performance. ...
than 1/F times of the arithmetic mean of the whole link SNR, DF always plays a more important role than AF in improving the BER performance. ...
The linear structure of ZP-OFDM provides a better BER performance and an easier blind channel estimation and blind symbol synchronization as well, while this is not the case for the CP-OFDM. ...
doi:10.5772/10157
fatcat:vv6nhwjdcbaoreskvhhwvsopnu
OFDM RoFSO Links with Relays Over Turbulence Channels and Nonzero Boresight Pointing Errors
2017
Journal of Communications
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In order to combat these impairments, in this work, we investigate the performance of various realistic RoFSO scenarios that may employ orthogonal frequency-division multiplexing (OFDM) scheme with Quadrature ...
Abstract-In the last few years, the radio on free space optics (RoFSO) technology that involves effective wireless transmissions of multiple radio frequency (RF) signals via free space optical (FSO) links ...
Fig. 4 shows the OP results obtained by using (26) for a single-hop, a dual-hop and a triple-hop RoFSO OFDM system. ...
doi:10.12720/jcm.12.12.644-660.
fatcat:277mc2wo3jc5naw2k47udfy2yi
Outage analysis of a dual-hop OFDM amplify-and-forward relay system with subcarrier mapping in Rayleigh fading
2014
EURASIP Journal on Wireless Communications and Networking
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The outage performances of these schemes are compared with balanced links, i.e., when the SNR is same for both hops, as well as unbalanced links, i.e., when the SNR of the second hop is one half of the ...
This paper presents the outage analysis of a dual-hop OFDM relay system with ordered subcarrier paring schemes, i.e., worst-to-best (WTB) SCM and best-to-best (BTB) SCM. ...
Specifically, [14] presents an optimized solution to minimize the sum power subject to sum rate constraint for the dual-hop OFDM system. ...
doi:10.1186/1687-1499-2014-209
fatcat:vyoyt5te3bgkdastv4d7vwf4le
Range Extension in IEEE 802.11ah Systems Through Relaying
2017
Wireless personal communications
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Finally, we present bit error rate (BER) results, obtained through simulations of a dual-hop DF IEEE 802.11ah relay system for the considered MCs. ...
Analyses are performed for two different standard adopted deployment scenarios on the RS-ST link. ...
802.11ah Systems Through Relaying ___________________________________________________________________ ...
doi:10.1007/s11277-017-4334-9
fatcat:qmtvdebhlvgifmhr2of72uncja
Power control for cognitive relay networks with sensing uncertainties
2016
EURASIP Journal on Wireless Communications and Networking
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In this article, we focus on the PC problem for a cognitive relay network under the spectrum sensing uncertainties to minimize the total bit error rate (BER) of SUs under the constraints of maximum transmit ...
needs to operate the algorithm in one link whose CSI is worst. ...
Acknowledgements The authors would like to thank the reviewers for their detailed reviews and constructive comments, which have helped improve the quality of this paper. ...
doi:10.1186/s13638-016-0617-1
fatcat:nvjiy5fyx5aqhoxqysvefaybhe
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