Pub Date : 2017-04-01DOI: 10.1109/WOCC.2017.7928987
M. Thollabandi, Ankush Mahajan, A. Mishra, B. Gomatam
We propose colorless flexi-grid WDM-PON system utilizing polarization multiplexed optical comb-source for downstream and upstream transmission. For proof-of-concept, we experimentally demonstrate full-duplex system carrying downlink and uplink capacity of 10 Gb/s and 2.5 Gb/s, respectively per subscriber over 7 km fiber.
{"title":"Colorless flexi-grid WDM-PON system based on polarization multiplexed optical comb","authors":"M. Thollabandi, Ankush Mahajan, A. Mishra, B. Gomatam","doi":"10.1109/WOCC.2017.7928987","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928987","url":null,"abstract":"We propose colorless flexi-grid WDM-PON system utilizing polarization multiplexed optical comb-source for downstream and upstream transmission. For proof-of-concept, we experimentally demonstrate full-duplex system carrying downlink and uplink capacity of 10 Gb/s and 2.5 Gb/s, respectively per subscriber over 7 km fiber.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91136975","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.2017.7929003
Te Wei, W. Feng, N. Ge, Jianhua Lu
With the growing demand for mobile multimedia services in marine activities, maritime communication systems are impelled to provide higher data rates with limited radio resources. Massive multiple-input multiple-output (MIMO) is thus recognized as a promising technology in this case. However, pilot contamination leads to strong inter-cell interference and greatly degrades system performance. In this paper, we focus on the joint position-power optimization of time-shifted pilots in a maritime massive MIMO system. Based on large-scale channel fading information, we first propose an efficient user scheduling algorithm, and then optimize the pilot power under the average power constraint. Further, we optimize the positions and power of the pilots iteratively. Simulation results show that our proposed scheme achieves a considerable coordination gain in system performance in terms of spectral efficiency.
{"title":"Optimized time-shifted pilots for maritime massive MIMO communication systems","authors":"Te Wei, W. Feng, N. Ge, Jianhua Lu","doi":"10.1109/WOCC.2017.7929003","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929003","url":null,"abstract":"With the growing demand for mobile multimedia services in marine activities, maritime communication systems are impelled to provide higher data rates with limited radio resources. Massive multiple-input multiple-output (MIMO) is thus recognized as a promising technology in this case. However, pilot contamination leads to strong inter-cell interference and greatly degrades system performance. In this paper, we focus on the joint position-power optimization of time-shifted pilots in a maritime massive MIMO system. Based on large-scale channel fading information, we first propose an efficient user scheduling algorithm, and then optimize the pilot power under the average power constraint. Further, we optimize the positions and power of the pilots iteratively. Simulation results show that our proposed scheme achieves a considerable coordination gain in system performance in terms of spectral efficiency.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89945597","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.2017.7929007
Mustapha Khiati, D. Djenouri
The problem of message broadcasting from the base station (BS) to sensor nodes (SNs) in solar energy harvesting wireless sensor networks (EHWSN) is considered in this paper. The aim is to ensure fast and reliable broadcasting without interfering with upstream communications (from SNs to BS), whilst taking into account energy harvesting constraints. An adaptive approach is proposed where the BS first selects the broadcast time slots, given a wake-up schedule for the SNs (the time slots where the SN are active and in receiving mode). Hence, the SNs adapt their schedules. This is then iterated seeking optimal selection of the broadcast time slots, so as to minimize broadcast overhead (transmitted messages) and latency. Our approach enables fast broadcast and eliminates the need for adding protocol overhead (redundancy), compared to the existing solutions. Hidden Markov Model (HMM) and Baum-Welch learning algorithm are used for this purpose. Numerical results confirm that our scheme performs the broadcast operation in less time, and by reducing the broadcast overhead, as compared to state-of-the-art approaches.
{"title":"ADABCAST: Adaptive broadcast approach for solar Energy Harvesting Wireless Sensor Networks","authors":"Mustapha Khiati, D. Djenouri","doi":"10.1109/WOCC.2017.7929007","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929007","url":null,"abstract":"The problem of message broadcasting from the base station (BS) to sensor nodes (SNs) in solar energy harvesting wireless sensor networks (EHWSN) is considered in this paper. The aim is to ensure fast and reliable broadcasting without interfering with upstream communications (from SNs to BS), whilst taking into account energy harvesting constraints. An adaptive approach is proposed where the BS first selects the broadcast time slots, given a wake-up schedule for the SNs (the time slots where the SN are active and in receiving mode). Hence, the SNs adapt their schedules. This is then iterated seeking optimal selection of the broadcast time slots, so as to minimize broadcast overhead (transmitted messages) and latency. Our approach enables fast broadcast and eliminates the need for adding protocol overhead (redundancy), compared to the existing solutions. Hidden Markov Model (HMM) and Baum-Welch learning algorithm are used for this purpose. Numerical results confirm that our scheme performs the broadcast operation in less time, and by reducing the broadcast overhead, as compared to state-of-the-art approaches.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86588515","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.2017.7929001
Mei Zhao, Haixia Zhang, Shuaishuai Guo, D. Yuan
This paper investigates the joint design of pilot assignment and pilot contamination precoding (PCP) to combat pilot contamination in multi-cell multi-user massive MIMO systems. The system performance of the downlink transmission in massive MIMO with PCP is investigated and an optimization problem is formulated to find the best pilot assignment solution in PCP assisted massive MIMO systems that can maximize the sum rate of the system. Two heuristic pilot assignment schemes are proposed to combine with zero forcing PCP (ZF-PCP) including a greedy scheme and a swapping-based scheme. The complexities of the both schemes are analyzed. Simulations are done and results indicate that the proposed two schemes perform well and can greatly outperform the ZF-PCP scheme and an existing enhanced PCP scheme with random pilot assignment. Results also show that obvious performance gain can be obtained by joint designing the pilot assignment and PCP.
{"title":"Joint pilot assignment and pilot contamination precoding design for massive MIMO systems","authors":"Mei Zhao, Haixia Zhang, Shuaishuai Guo, D. Yuan","doi":"10.1109/WOCC.2017.7929001","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929001","url":null,"abstract":"This paper investigates the joint design of pilot assignment and pilot contamination precoding (PCP) to combat pilot contamination in multi-cell multi-user massive MIMO systems. The system performance of the downlink transmission in massive MIMO with PCP is investigated and an optimization problem is formulated to find the best pilot assignment solution in PCP assisted massive MIMO systems that can maximize the sum rate of the system. Two heuristic pilot assignment schemes are proposed to combine with zero forcing PCP (ZF-PCP) including a greedy scheme and a swapping-based scheme. The complexities of the both schemes are analyzed. Simulations are done and results indicate that the proposed two schemes perform well and can greatly outperform the ZF-PCP scheme and an existing enhanced PCP scheme with random pilot assignment. Results also show that obvious performance gain can be obtained by joint designing the pilot assignment and PCP.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81577484","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.2017.7928984
L. Leng
It is well known that distributed Raman amplification (DRA) may suffer from multiple-path interference, which is mainly due to double back-reflections (DBR) at discontinuities such as connectors/splices and double Rayleigh backscattering (DRB) within the fiber amplifier. In this work, the impact of DBR and DRB noise on the system performance is analytically assessed for standard single mode and large effective area low loss fiber links employing PDM-16QAM and DRA. Performance prediction errors due to negligence of DRB noise are estimated, and operation criteria are provided for mitigating back-reflection induced impairments.
{"title":"Impact of multiple-path interference on the performance of coherent transmission systems employing distributed Raman amplification","authors":"L. Leng","doi":"10.1109/WOCC.2017.7928984","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928984","url":null,"abstract":"It is well known that distributed Raman amplification (DRA) may suffer from multiple-path interference, which is mainly due to double back-reflections (DBR) at discontinuities such as connectors/splices and double Rayleigh backscattering (DRB) within the fiber amplifier. In this work, the impact of DBR and DRB noise on the system performance is analytically assessed for standard single mode and large effective area low loss fiber links employing PDM-16QAM and DRA. Performance prediction errors due to negligence of DRB noise are estimated, and operation criteria are provided for mitigating back-reflection induced impairments.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88823786","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.2017.7929004
Yueyun Chen, Yanqing Xia, Yaxin Xing, Liuqing Yang
Massive MIMO has the advantage of providing excellent multiplexing/diversity gain and data rate due to the large antenna array equipped at the BS or UEs. However, the high hardware cost and computational complexity limit the practical implementation of large antenna array. In this paper, we formulate a Minimum Mean Square Error (MMSE) based optimization model under the partially-connected structure to reduce the hardware cost, and propose a low complexity hybrid precoding algorithm based on the Particle Swarm Ant Colony Optimization (HP-PSACO). Simulation results show that the proposed algorithm with low computational complexity achieves higher energy efficiency than the fully digital baseband precoding.
{"title":"Low complexity hybrid precoding for mmWave Massive MIMO systems","authors":"Yueyun Chen, Yanqing Xia, Yaxin Xing, Liuqing Yang","doi":"10.1109/WOCC.2017.7929004","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7929004","url":null,"abstract":"Massive MIMO has the advantage of providing excellent multiplexing/diversity gain and data rate due to the large antenna array equipped at the BS or UEs. However, the high hardware cost and computational complexity limit the practical implementation of large antenna array. In this paper, we formulate a Minimum Mean Square Error (MMSE) based optimization model under the partially-connected structure to reduce the hardware cost, and propose a low complexity hybrid precoding algorithm based on the Particle Swarm Ant Colony Optimization (HP-PSACO). Simulation results show that the proposed algorithm with low computational complexity achieves higher energy efficiency than the fully digital baseband precoding.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82242711","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.2017.7928977
Paa Kwesi Esubonteng, R. Rojas-Cessa
We propose a sequential staging access scheme to minimize the occurrence of channel-access collisions in infrastructure IEEE 802.11 (WiFi) networks under emergency and crowded scenarios in this paper. The proposed scheme is based on separating the functions performed by station for channel access and dedicating states for contention and transmission separately rather than using a single shared state as done in IEEE 802.11. The result is an increase in access success ratio and avoidance of throughput collapse 802.11. The proposed scheme overcomes the throughput and utilization collapse of IEEE 802.11 under crowded scenarios and increases bandwidth utilization. This access is critical for crowded networks under emergency scenarios where many stations suddenly and intensively contend for network access. This scheme may also fits as a fallback mechanism of IEEE 802.11 networks to avoid throughput collapse under crowded scenarios and thus, to enable reliable communications in critical situations. Our simulation results show significant improvements on bandwidth utilization and throughput as compared to IEEE 802.11 under crowded conditions.
{"title":"SOSMAC: Separated operation states in Medium Access Control for emergency communications on IEEE 802.11-like crowded networks","authors":"Paa Kwesi Esubonteng, R. Rojas-Cessa","doi":"10.1109/WOCC.2017.7928977","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928977","url":null,"abstract":"We propose a sequential staging access scheme to minimize the occurrence of channel-access collisions in infrastructure IEEE 802.11 (WiFi) networks under emergency and crowded scenarios in this paper. The proposed scheme is based on separating the functions performed by station for channel access and dedicating states for contention and transmission separately rather than using a single shared state as done in IEEE 802.11. The result is an increase in access success ratio and avoidance of throughput collapse 802.11. The proposed scheme overcomes the throughput and utilization collapse of IEEE 802.11 under crowded scenarios and increases bandwidth utilization. This access is critical for crowded networks under emergency scenarios where many stations suddenly and intensively contend for network access. This scheme may also fits as a fallback mechanism of IEEE 802.11 networks to avoid throughput collapse under crowded scenarios and thus, to enable reliable communications in critical situations. Our simulation results show significant improvements on bandwidth utilization and throughput as compared to IEEE 802.11 under crowded conditions.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86817116","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.2017.7928989
W. Popoola, E. Pikasis, I. Osahon
The concept of hybrid polymer optical fibre (POF) and visible light communication (VLC) for in-home networking is experimentally evaluated in this paper. The performance evaluation is based on two schemes of discrete multitone (DMT) and multilevel pulse amplitude modulation (PAM) techniques. The combined effects of modal dispersion of the POF and the limited bandwidth of the phosphor converted illumination LEDs induced frequency selectivity in the heterogeneous link. Equalisers are subsequently used to ameliorate the frequency selectivity of the channel. Results show that from a limited link 3-dB bandwidth of 17 MHz, a data rate of 122 Mbps is attainable using DMT with bit-loading while 91 Mbps is achievable with the low complexity PAM-4. The experimental demonstration results presented in this paper show that the POF/VLC hybrid represents a viable concept to extend the optical bandwidth available in the access network to the in-home network.
{"title":"Hybrid polymer optical fibre and visible light communication link for in-home network","authors":"W. Popoola, E. Pikasis, I. Osahon","doi":"10.1109/WOCC.2017.7928989","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928989","url":null,"abstract":"The concept of hybrid polymer optical fibre (POF) and visible light communication (VLC) for in-home networking is experimentally evaluated in this paper. The performance evaluation is based on two schemes of discrete multitone (DMT) and multilevel pulse amplitude modulation (PAM) techniques. The combined effects of modal dispersion of the POF and the limited bandwidth of the phosphor converted illumination LEDs induced frequency selectivity in the heterogeneous link. Equalisers are subsequently used to ameliorate the frequency selectivity of the channel. Results show that from a limited link 3-dB bandwidth of 17 MHz, a data rate of 122 Mbps is attainable using DMT with bit-loading while 91 Mbps is achievable with the low complexity PAM-4. The experimental demonstration results presented in this paper show that the POF/VLC hybrid represents a viable concept to extend the optical bandwidth available in the access network to the in-home network.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87173509","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.2017.7928991
F. Akhoundi, A. Minoofar, J. Salehi
A positioning system for underwater users is proposed based on the underwater wireless optical CDMA network. Two different localization schemes namely Received Signal Strength (RSS) and Time of Arrival (TOA) are discussed and their performances in the presence of optical turbulence are explored.
{"title":"Underwater positioning system based on cellular underwater wireless optical CDMA networks","authors":"F. Akhoundi, A. Minoofar, J. Salehi","doi":"10.1109/WOCC.2017.7928991","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928991","url":null,"abstract":"A positioning system for underwater users is proposed based on the underwater wireless optical CDMA network. Two different localization schemes namely Received Signal Strength (RSS) and Time of Arrival (TOA) are discussed and their performances in the presence of optical turbulence are explored.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76777409","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.2017.7928998
U. Sawant, R. Akl
LTE networks are deployed to increase capacity and coverage especially for the indoor and cell-edge mobile users. However, such deployment comes with major challenges, radio resource management and inter-cell interferences. Fractional Frequency Reuse mechanism (FFR) is one of the most effective interference avoidance techniques. In this paper, we evaluate an existing adaptation process that adjusts to better network performance as users move in the network. With adaptation in place, we utilize our proposed metric to determine inner region radius and frequency allocation which generates high total cell throughput and serves maximum number of users in the network. The performance of static sectorized FFR with specific mobility model using adaptation process is evaluated using proposed metric and other metrics.
{"title":"Evaluation of adaptive and non adaptive LTE Fractional Frequency Reuse mechanisms","authors":"U. Sawant, R. Akl","doi":"10.1109/WOCC.2017.7928998","DOIUrl":"https://doi.org/10.1109/WOCC.2017.7928998","url":null,"abstract":"LTE networks are deployed to increase capacity and coverage especially for the indoor and cell-edge mobile users. However, such deployment comes with major challenges, radio resource management and inter-cell interferences. Fractional Frequency Reuse mechanism (FFR) is one of the most effective interference avoidance techniques. In this paper, we evaluate an existing adaptation process that adjusts to better network performance as users move in the network. With adaptation in place, we utilize our proposed metric to determine inner region radius and frequency allocation which generates high total cell throughput and serves maximum number of users in the network. The performance of static sectorized FFR with specific mobility model using adaptation process is evaluated using proposed metric and other metrics.","PeriodicalId":6471,"journal":{"name":"2017 26th Wireless and Optical Communication Conference (WOCC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74586385","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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