Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928972
Ishani Chatterjee, Mengchu Zhou
A differential evolution (DE) algorithm is an evolutionary algorithm for optimization problems over a continuous domain. To solve high dimensional global optimization problems, this work investigates the performance of differential evolution algorithms under a multi-population strategy. The original DE algorithm generates an initial set of suitable solutions. The multi population strategy divides the set into several subsets. These subsets evolve independently and connect with each other according to the DE algorithm. This helps in preserving the diversity of the initial set. Furthermore, a comparison of combination of different mutation techniques on several optimization algorithms is studied to verify their performance. Finally the computational results on eleven well-know benchmark optimization functions, reveal some interesting relationship between the number of subpopulations and performance of the DE.
{"title":"Differential evolution algorithms under multi-population strategy","authors":"Ishani Chatterjee, Mengchu Zhou","doi":"10.1109/WOCC.2017.7928972","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928972","url":null,"abstract":"A differential evolution (DE) algorithm is an evolutionary algorithm for optimization problems over a continuous domain. To solve high dimensional global optimization problems, this work investigates the performance of differential evolution algorithms under a multi-population strategy. The original DE algorithm generates an initial set of suitable solutions. The multi population strategy divides the set into several subsets. These subsets evolve independently and connect with each other according to the DE algorithm. This helps in preserving the diversity of the initial set. Furthermore, a comparison of combination of different mutation techniques on several optimization algorithms is studied to verify their performance. Finally the computational results on eleven well-know benchmark optimization functions, reveal some interesting relationship between the number of subpopulations and performance of the DE.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"4 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80818302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7929009
V. Ozduran, E. Soleimani-Nasab, B. Yarman
This paper investigates the channel estimation error effects on the opportunistic relay selection strategy. The opportunistic relay selection strategy is based on selecting the maximum sum-rate of half/full-duplex relay terminal among N. The investigation considers a dual-hop multiple half/full-duplex bi-directional wireless relaying networks in the system model. According to Monte-Carlo simulation results, sum-rate based relay selection strategy achieves cooperative diversity in high signal-to-noise regimes both for half/full-duplex cases. However, for the full-duplex based case, if the loop interference variances are relatively high, the achievable cooperative diversity turns out to be 0 from N while also causes system coding gain losses. The CEE causes system coding gain losses in low signal-to-noise ratio regimes. However, in high signal-to-noise ratio regimes, the CEE effects turn out to be at negligible levels.
{"title":"Sum-rate based opportunistic relay selection with channel estimation error for a dual-hop multiple half/full-duplex bi-directional wireless relaying networks","authors":"V. Ozduran, E. Soleimani-Nasab, B. Yarman","doi":"10.1109/WOCC.2017.7929009","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929009","url":null,"abstract":"This paper investigates the channel estimation error effects on the opportunistic relay selection strategy. The opportunistic relay selection strategy is based on selecting the maximum sum-rate of half/full-duplex relay terminal among N. The investigation considers a dual-hop multiple half/full-duplex bi-directional wireless relaying networks in the system model. According to Monte-Carlo simulation results, sum-rate based relay selection strategy achieves cooperative diversity in high signal-to-noise regimes both for half/full-duplex cases. However, for the full-duplex based case, if the loop interference variances are relatively high, the achievable cooperative diversity turns out to be 0 from N while also causes system coding gain losses. The CEE causes system coding gain losses in low signal-to-noise ratio regimes. However, in high signal-to-noise ratio regimes, the CEE effects turn out to be at negligible levels.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"37 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78352291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928994
Hossam M. Alsaket, K. Mahmoud, H. Elattar, M. Aboul-Dahab
Recently, Cognitive network has drawn the attention as a promising technology to enhance communication system performance by efficiently utilizing system resources. It provides prompt response to dynamic changes. In this paper, a modified multi-objective particle swarm optimization (M-MOPSO) is proposed in Cognitive IP Multimedia Subsystem (CogIMS) to improve the global network performance. The implementation and evaluation results of the system design using the algorithm is provided and compared with those obtained using Non-Dominated Sorting Genetic Algorithm (NSGA-II). Extensive simulations are carried out by using MATLAB software showed that M-MOPSO is comparable to NSGA-II in the network throughput. However, on average, M-MOPSO is faster than NSGA-II by 6.25 times considering the needed computation time for algorithm convergence.
{"title":"Resource optimizer for Cognitive Network using multi-objective particle swarm system","authors":"Hossam M. Alsaket, K. Mahmoud, H. Elattar, M. Aboul-Dahab","doi":"10.1109/WOCC.2017.7928994","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928994","url":null,"abstract":"Recently, Cognitive network has drawn the attention as a promising technology to enhance communication system performance by efficiently utilizing system resources. It provides prompt response to dynamic changes. In this paper, a modified multi-objective particle swarm optimization (M-MOPSO) is proposed in Cognitive IP Multimedia Subsystem (CogIMS) to improve the global network performance. The implementation and evaluation results of the system design using the algorithm is provided and compared with those obtained using Non-Dominated Sorting Genetic Algorithm (NSGA-II). Extensive simulations are carried out by using MATLAB software showed that M-MOPSO is comparable to NSGA-II in the network throughput. However, on average, M-MOPSO is faster than NSGA-II by 6.25 times considering the needed computation time for algorithm convergence.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"6 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84595485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928981
M. Khan, M. Shemis, A. Ragheb, H. Fathallah, S. Alshebeili, Mohammed Z. U. Khan
We demonstrate a single channel free space optical dual polarization - quadrature phase shift keying (DP-QPSK) transmission using an injection-locked InAs/InP quantum dash (Qdash) laser by employing external modulation. A receiver sensitivity of −19 dBm at ∼1621 nm is observed over a 4 m indoor channel at 64 Gb/s transmission rate. This stems the potential of Qdash lasers as a source in optical wireless communication, which is being considered as an alternative optical access technology for future high speed communication networks.
{"title":"64 Gb/s quantum-dash laser based indoor free space optical communication","authors":"M. Khan, M. Shemis, A. Ragheb, H. Fathallah, S. Alshebeili, Mohammed Z. U. Khan","doi":"10.1109/WOCC.2017.7928981","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928981","url":null,"abstract":"We demonstrate a single channel free space optical dual polarization - quadrature phase shift keying (DP-QPSK) transmission using an injection-locked InAs/InP quantum dash (Qdash) laser by employing external modulation. A receiver sensitivity of −19 dBm at ∼1621 nm is observed over a 4 m indoor channel at 64 Gb/s transmission rate. This stems the potential of Qdash lasers as a source in optical wireless communication, which is being considered as an alternative optical access technology for future high speed communication networks.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"187 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89432047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928988
B. Dingel
We present a linear optical frequency discriminator (FD) filter with (i) selectable dual-slope functionality and (ii) switchable slope (positive or negative) signs for flexible frequency-modulated / phase-modulated direct-detection (FM/PM-DD) microwave photonics links (MPLs). The FD uses only two Mach-Zehnder interferometers (MZIs) and one Y-branch combiner. When the optical path-length differences (OPLDs, ΔL2 = − ΔL1) of the two MZIs have equal magnitude but opposite sign, the FD filter (refer to as FD-1) has a linear slope value of −0.63 and a corresponding full bandwidth utilization (BWU). On the other hand, when the two OPLDs (ΔL2 = ΔL1), have equal magnitude and same sign, the FD filter (refer to as FD-2) has a linear slope value of −1.23 but its BWU is reduced to ∼ 0.4 BWU. The second dynamic feature, switchable slope (positive or negative) sign is achieved if the both OPLDs, ΔL2 and ΔL1 are made tunable. Both slopes have excellent linearity performance when the power split ratio r of the Y-branch combiners is set to 0.113. The link gain is enhanced by the increase in the slope value. The dual-slope FD filter opens up the possibility of a flexible and dynamic MPLs and systems.
{"title":"Dual-slope linear optical frequency discriminator for flexible, high performance frequency modulated direct detection (FM-DD) microwave photonics links","authors":"B. Dingel","doi":"10.1109/WOCC.2017.7928988","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928988","url":null,"abstract":"We present a linear optical frequency discriminator (FD) filter with (i) selectable dual-slope functionality and (ii) switchable slope (positive or negative) signs for flexible frequency-modulated / phase-modulated direct-detection (FM/PM-DD) microwave photonics links (MPLs). The FD uses only two Mach-Zehnder interferometers (MZIs) and one Y-branch combiner. When the optical path-length differences (OPLDs, ΔL<inf>2</inf> = − ΔL<inf>1</inf>) of the two MZIs have equal magnitude but opposite sign, the FD filter (refer to as FD-1) has a linear slope value of −0.63 and a corresponding full bandwidth utilization (BWU). On the other hand, when the two OPLDs (ΔL<inf>2</inf> = ΔL<inf>1</inf>), have equal magnitude and same sign, the FD filter (refer to as FD-2) has a linear slope value of −1.23 but its BWU is reduced to ∼ 0.4 BWU. The second dynamic feature, switchable slope (positive or negative) sign is achieved if the both OPLDs, ΔL<inf>2</inf> and ΔL<inf>1</inf> are made tunable. Both slopes have excellent linearity performance when the power split ratio r of the Y-branch combiners is set to 0.113. The link gain is enhanced by the increase in the slope value. The dual-slope FD filter opens up the possibility of a flexible and dynamic MPLs and systems.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"37 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89621577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928979
I. Roudas
Modal dispersion in strongly-coupled multimode and multicore optical fibers can be viewed as a generalization of polarization-mode dispersion in single-mode fibers. Due to the similarities between these two transmission effects, the conventional Jones and Stokes calculus for polarization-mode dispersion can be extended to the case of modal dispersion. In this paper, we review and expand the theoretical framework used for the representation of modal dispersion in Stokes space by the modal dispersion vector. We show, for the first time, that the modal dispersion vector can be written as a weighted sum of the Stokes vectors representing the principal modes with the corresponding mode group delays as coefficients. This constitutes a fundamental relationship that leads to a reinterpretation of the modal dispersion vector and can be used to derive its properties.
{"title":"Modeling of modal dispersion in multimode and multicore optical fibers","authors":"I. Roudas","doi":"10.1109/WOCC.2017.7928979","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928979","url":null,"abstract":"Modal dispersion in strongly-coupled multimode and multicore optical fibers can be viewed as a generalization of polarization-mode dispersion in single-mode fibers. Due to the similarities between these two transmission effects, the conventional Jones and Stokes calculus for polarization-mode dispersion can be extended to the case of modal dispersion. In this paper, we review and expand the theoretical framework used for the representation of modal dispersion in Stokes space by the modal dispersion vector. We show, for the first time, that the modal dispersion vector can be written as a weighted sum of the Stokes vectors representing the principal modes with the corresponding mode group delays as coefficients. This constitutes a fundamental relationship that leads to a reinterpretation of the modal dispersion vector and can be used to derive its properties.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"46 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79490249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928990
Jie Tang, Li-Jiang Zhang, Long-De Wang, Feng Shan, T. Zhang
We demonstrate a polymeric electro-optic (EO) modulator with a Mach-Zehnder interferometer (MZI) structure. Low loss fluorinated polyimide (FPI) and low cost nonlinear optical (NLO) chromophores of disperse red 1 (DR 1) were introduced to form the core layer of the modulator. The fabricated EO polymer waveguide exhibits a low propagation loss of 1.14 dB/cm, and the modulating device exhibits a good EO response which indicates a low half-wave voltage of about 5.4 V. The results show that the polymeric EO material of DR 1 doped FPI is a good candidate of high performance EO materials and the modulating device based on the EO polymer possesses potential applications.
{"title":"Low loss polymeric electro-optic modulator based on disperse red 1 doped fluorinated polyimide","authors":"Jie Tang, Li-Jiang Zhang, Long-De Wang, Feng Shan, T. Zhang","doi":"10.1109/WOCC.2017.7928990","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928990","url":null,"abstract":"We demonstrate a polymeric electro-optic (EO) modulator with a Mach-Zehnder interferometer (MZI) structure. Low loss fluorinated polyimide (FPI) and low cost nonlinear optical (NLO) chromophores of disperse red 1 (DR 1) were introduced to form the core layer of the modulator. The fabricated EO polymer waveguide exhibits a low propagation loss of 1.14 dB/cm, and the modulating device exhibits a good EO response which indicates a low half-wave voltage of about 5.4 V. The results show that the polymeric EO material of DR 1 doped FPI is a good candidate of high performance EO materials and the modulating device based on the EO polymer possesses potential applications.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"102 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78107915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7929006
Yueyun Chen, Rongling Jian, Shuaishuai Ma, S. A. Mohadeskasaei
Millimeter-wave antennas are one of the key parts in 5G systems due to its useful properties such as ultra wideband and high transmission rate. In this paper, the research of microstrip millimeter wave patch antenna at 28 GHz is proposed. The resonant frequency of microstrip antenna is shifted to the expanding bandwidth through slotting the patch. Meanwhile, adding punish function to fitness function is proposed to develop the bandwidth and improve the resonant frequency to desired frequency. The slot position is obtained by the genetic algorithm (GA). Furthermore, by using the numerical array synthesis, a linear uniformly spaced array model with feed network is obtained. The array with better radiation pattern is obtained through GA. The simulation results show that the bandwidth is improved from 0.9 to 1.25 GHz while the resonant frequency is remained at 28 GHz with the help of the proposed punish function. The side-lobe level is lowered by 4 dB and the maximum antenna gain is improved to 0.4 dB at the cost of 1° wider of half-power (HP) beamwidth.
{"title":"A research for millimeter wave patch antenna and array synthesis","authors":"Yueyun Chen, Rongling Jian, Shuaishuai Ma, S. A. Mohadeskasaei","doi":"10.1109/WOCC.2017.7929006","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929006","url":null,"abstract":"Millimeter-wave antennas are one of the key parts in 5G systems due to its useful properties such as ultra wideband and high transmission rate. In this paper, the research of microstrip millimeter wave patch antenna at 28 GHz is proposed. The resonant frequency of microstrip antenna is shifted to the expanding bandwidth through slotting the patch. Meanwhile, adding punish function to fitness function is proposed to develop the bandwidth and improve the resonant frequency to desired frequency. The slot position is obtained by the genetic algorithm (GA). Furthermore, by using the numerical array synthesis, a linear uniformly spaced array model with feed network is obtained. The array with better radiation pattern is obtained through GA. The simulation results show that the bandwidth is improved from 0.9 to 1.25 GHz while the resonant frequency is remained at 28 GHz with the help of the proposed punish function. The side-lobe level is lowered by 4 dB and the maximum antenna gain is improved to 0.4 dB at the cost of 1° wider of half-power (HP) beamwidth.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"3 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86662886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928993
W. Feng, N. Ge, Jianhua Lu
The coordination between satellite communications and terrestrial mobile networks is promising to enable a globally ubiquitous broadband wireless coverage. It also provides an opportunity to share the spectrum between satellites and terrestrial networks, to alleviate the spectrum scarcity problem facing in both systems. Particularly in a coordinated satellite-terrestrial network (CSTN), the co-channel interference (CCI) should be carefully mitigated. Towards this end, this paper proposes a large-scale channel state information (CSI)-based robust coordination scheme. As the information exchange between satellite and terrestrial system is practically limited, and the overhead of each system for CSI acquisition is also limited, the proposed scheme is much more viable than existing results. In practice, the slowly-varying large-scale CSI can be obtained with a quite low cost, and the saddle point theory can be adopted to largely reduce the computational complexity of the proposed scheme. We finally show the simulation results to validate the superiority of the proposed scheme over existing methods.
{"title":"Coordinated satellite-terrestrial networks: A robust spectrum sharing perspective","authors":"W. Feng, N. Ge, Jianhua Lu","doi":"10.1109/WOCC.2017.7928993","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928993","url":null,"abstract":"The coordination between satellite communications and terrestrial mobile networks is promising to enable a globally ubiquitous broadband wireless coverage. It also provides an opportunity to share the spectrum between satellites and terrestrial networks, to alleviate the spectrum scarcity problem facing in both systems. Particularly in a coordinated satellite-terrestrial network (CSTN), the co-channel interference (CCI) should be carefully mitigated. Towards this end, this paper proposes a large-scale channel state information (CSI)-based robust coordination scheme. As the information exchange between satellite and terrestrial system is practically limited, and the overhead of each system for CSI acquisition is also limited, the proposed scheme is much more viable than existing results. In practice, the slowly-varying large-scale CSI can be obtained with a quite low cost, and the saddle point theory can be adopted to largely reduce the computational complexity of the proposed scheme. We finally show the simulation results to validate the superiority of the proposed scheme over existing methods.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"24 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82784813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7929011
M. Kamruzzaman
A relay assisted system using Hybrid-STBC-VBLAST for Multiple Access Channel (MAC) is proposed in this paper. The proposed system encodes information at handsets of multiple users using Space Time Block Coding (STBC); decodes and re-encodes using Hybrid-STBC-VBLAST at relay; and decodes using Maximum-likelihood (ML) at destination. The results are evaluated for 4 to 8 transmit antennas of relay and 4 to 8 receive antennas of relay and destination, and it is shown in this paper that it is possible to increase number of transmit and receive antennas to get advantages of massive antennas with simple encoding techniques explained in this paper. Simulation results are presented to show the BER performance of the system. The BER performance of Hybrid-STBC-VBLAST is compared with relay assisted MAC using STBC and VBLAST. It is shown that the BER performance of Hybrid-STBC-VBLAST is very close to the performance of STBC but it outperforms VBLAST for relay assisted MAC. The performance of the proposed system is also evaluated with and without relay, and it is shown that proposed system provides 11–17 dB gain compared to a direct link system at 10−6.
{"title":"Relay assisted Multiple Input Multiple Output wireless communication system for Multiple Access Channel using Hybrid-STBC-VBLAST","authors":"M. Kamruzzaman","doi":"10.1109/WOCC.2017.7929011","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929011","url":null,"abstract":"A relay assisted system using Hybrid-STBC-VBLAST for Multiple Access Channel (MAC) is proposed in this paper. The proposed system encodes information at handsets of multiple users using Space Time Block Coding (STBC); decodes and re-encodes using Hybrid-STBC-VBLAST at relay; and decodes using Maximum-likelihood (ML) at destination. The results are evaluated for 4 to 8 transmit antennas of relay and 4 to 8 receive antennas of relay and destination, and it is shown in this paper that it is possible to increase number of transmit and receive antennas to get advantages of massive antennas with simple encoding techniques explained in this paper. Simulation results are presented to show the BER performance of the system. The BER performance of Hybrid-STBC-VBLAST is compared with relay assisted MAC using STBC and VBLAST. It is shown that the BER performance of Hybrid-STBC-VBLAST is very close to the performance of STBC but it outperforms VBLAST for relay assisted MAC. The performance of the proposed system is also evaluated with and without relay, and it is shown that proposed system provides 11–17 dB gain compared to a direct link system at 10−6.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":"46 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87493766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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