Pub Date : 2011-09-26DOI: 10.1109/ATC.2011.6027439
Tuan-Duc Nguyen, Quoc-Bao Vo-Nguyen, Minh-Thanh Vo, Linh Mai
In wireless distributed networks, cooperative relay and cooperative Multi-Input Multi-Output (MIMO) techniques can be used to exploit the spatial and temporal diversity gain in order to increase the performance or reduce the transmission energy consumption. The energy efficiency of cooperative MIMO and relay techniques is then very useful for the Infrastructure to Vehicle (I2V) and Infrastructure to Infrastructure (I2I) communications in Intelligent Transport Systems (ITS) networks where the energy consumption of wireless nodes embedded on road infrastructure is constrained. In this paper, applications of cooperation between nodes to ITS networks are proposed and the performance and the energy consumption of cooperative relay and cooperative MIMO are investigated in comparison with the traditional multi-hop technique. The comparison between these cooperative techniques helps us to choose the optimal cooperative strategy in terms of energy consumption for energy constrained road infrastructure networks in ITS applications.
{"title":"Energy efficient cooperative communication techniques for Intelligent Transport System","authors":"Tuan-Duc Nguyen, Quoc-Bao Vo-Nguyen, Minh-Thanh Vo, Linh Mai","doi":"10.1109/ATC.2011.6027439","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027439","url":null,"abstract":"In wireless distributed networks, cooperative relay and cooperative Multi-Input Multi-Output (MIMO) techniques can be used to exploit the spatial and temporal diversity gain in order to increase the performance or reduce the transmission energy consumption. The energy efficiency of cooperative MIMO and relay techniques is then very useful for the Infrastructure to Vehicle (I2V) and Infrastructure to Infrastructure (I2I) communications in Intelligent Transport Systems (ITS) networks where the energy consumption of wireless nodes embedded on road infrastructure is constrained. In this paper, applications of cooperation between nodes to ITS networks are proposed and the performance and the energy consumption of cooperative relay and cooperative MIMO are investigated in comparison with the traditional multi-hop technique. The comparison between these cooperative techniques helps us to choose the optimal cooperative strategy in terms of energy consumption for energy constrained road infrastructure networks in ITS applications.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125440084","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027465
N. Luong, Xiaowei Zhu, Jing Liu
A type of tunable narrow-bandpass filter is proposed in this paper. Fourth-order microstrip ring resonator with magnetic coupling is employed and loaded with varactors for achieving agility in the filter response. The simulation result showed that the center frequency of the proposed filter can be adjusted from 698 to 886 MHz and tuning range of 188 MHz, 1-dB constant absolute bandwidth of 9 MHz and insertion loss less than 10 dB are obtained. Additionally, the out-of-band rejection is improved by two transmission zeros which located on lower-side and higher-side of the pass-band. The measured performance of the fabricated filter shows good agreement with the proposed theory.
{"title":"Tunable narrowband bandpass filter using higher order microstrip ring resonator","authors":"N. Luong, Xiaowei Zhu, Jing Liu","doi":"10.1109/ATC.2011.6027465","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027465","url":null,"abstract":"A type of tunable narrow-bandpass filter is proposed in this paper. Fourth-order microstrip ring resonator with magnetic coupling is employed and loaded with varactors for achieving agility in the filter response. The simulation result showed that the center frequency of the proposed filter can be adjusted from 698 to 886 MHz and tuning range of 188 MHz, 1-dB constant absolute bandwidth of 9 MHz and insertion loss less than 10 dB are obtained. Additionally, the out-of-band rejection is improved by two transmission zeros which located on lower-side and higher-side of the pass-band. The measured performance of the fabricated filter shows good agreement with the proposed theory.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122048718","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027445
V. Nguyen, H. P. Phan, M. Hoang, D. Nguyen, M. Dang, T. Nguyen-Tran, N. Tran, Anh Hoang, E. Fribourg-Blanc
An antenna structure for UHF RFID tag matched to ST Microelectronics XRAG2 passive tag IC is proposed in this paper. The design is realized on PET (Polyethylene Terephthalate) substrate that has the overall dimension of 82.5 mm × 45.29 mm. The simulation shows that the proposed zigzag-shaped antenna has the return loss at the resonant frequency of −39 dB and omni-directional radiation characteristics with the maximum gain of about 1.97 dBi that is much better than that of the initial meander dipole. The prototype antenna was tested by Rohde & Shwarz ZVB Vector Network Analyzer and showed good fit with the simulation results.
提出了一种与意法半导体XRAG2无源标签集成电路相匹配的超高频RFID标签天线结构。该设计在PET(聚对苯二甲酸乙二醇酯)衬底上实现，其整体尺寸为82.5 mm × 45.29 mm。仿真结果表明，所设计之字形天线在谐振频率为−39 dB处的回波损耗和全向辐射特性，最大增益约为1.97 dBi，远优于初始弯曲偶极子天线。通过罗德与施瓦茨公司的ZVB矢量网络分析仪对天线样机进行了测试，结果与仿真结果吻合良好。
{"title":"Improving radiation characteristics of UHF RFID antennas by zigzag structures","authors":"V. Nguyen, H. P. Phan, M. Hoang, D. Nguyen, M. Dang, T. Nguyen-Tran, N. Tran, Anh Hoang, E. Fribourg-Blanc","doi":"10.1109/ATC.2011.6027445","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027445","url":null,"abstract":"An antenna structure for UHF RFID tag matched to ST Microelectronics XRAG2 passive tag IC is proposed in this paper. The design is realized on PET (Polyethylene Terephthalate) substrate that has the overall dimension of 82.5 mm × 45.29 mm. The simulation shows that the proposed zigzag-shaped antenna has the return loss at the resonant frequency of −39 dB and omni-directional radiation characteristics with the maximum gain of about 1.97 dBi that is much better than that of the initial meander dipole. The prototype antenna was tested by Rohde & Shwarz ZVB Vector Network Analyzer and showed good fit with the simulation results.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116844389","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027474
H. Nguyen-Le, T. Le-Ngoc, C. Ko
Follower partial band jamming is recognized as the most efficient strategy to deteriorate the performance of frequency hopping (FH) systems with M-ary frequency shift keying (MFSK) modulation. In this paper, a pilot-aided parallel jamming cancelation (PJC) scheme that uses a two-element array is proposed for both follower jamming rejection and symbol detection in slow FH/MFSK systems over slow frequency-flat fading channels. Simulation results demonstrate that the proposed PJC scheme outperforms the ML-based scheme [1], the traditional ML approach, and the sample matrix inversion (SMI) method [2] over a wide signal-to-jamming ratio (SJR) range.
{"title":"Pilot-aided jamming cancelation in slow FH/MFSK systems","authors":"H. Nguyen-Le, T. Le-Ngoc, C. Ko","doi":"10.1109/ATC.2011.6027474","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027474","url":null,"abstract":"Follower partial band jamming is recognized as the most efficient strategy to deteriorate the performance of frequency hopping (FH) systems with M-ary frequency shift keying (MFSK) modulation. In this paper, a pilot-aided parallel jamming cancelation (PJC) scheme that uses a two-element array is proposed for both follower jamming rejection and symbol detection in slow FH/MFSK systems over slow frequency-flat fading channels. Simulation results demonstrate that the proposed PJC scheme outperforms the ML-based scheme [1], the traditional ML approach, and the sample matrix inversion (SMI) method [2] over a wide signal-to-jamming ratio (SJR) range.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123908558","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027428
Thanh Dinh Ngoc, Younghan Kim, Seil Jeon
Energy efficiency is a critical feature to be considered in wireless sensor networks (WSNs). In recent studies, it was revealed that congestion is one of the main factors to provoke energy consumption in constrained environments. To alleviate congestion, several studies have been investigated, but mostly focused on the transport layer. In this paper, we propose a congestion-aware energy-efficient routing protocol in WSNs (CER), which considers the congestion and energy levels of nodes together to increase the network lifetime while maintaining the network throughput. Our experimental results show that there are improvements in the energy consumption, the network lifetime, and throughput as compared to the other energy-aware routing protocols.
{"title":"Congestion-aware energy-efficient routing in wireless sensor networks","authors":"Thanh Dinh Ngoc, Younghan Kim, Seil Jeon","doi":"10.1109/ATC.2011.6027428","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027428","url":null,"abstract":"Energy efficiency is a critical feature to be considered in wireless sensor networks (WSNs). In recent studies, it was revealed that congestion is one of the main factors to provoke energy consumption in constrained environments. To alleviate congestion, several studies have been investigated, but mostly focused on the transport layer. In this paper, we propose a congestion-aware energy-efficient routing protocol in WSNs (CER), which considers the congestion and energy levels of nodes together to increase the network lifetime while maintaining the network throughput. Our experimental results show that there are improvements in the energy consumption, the network lifetime, and throughput as compared to the other energy-aware routing protocols.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116501400","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027431
V. Dang, T. Phan, Ba-Vui Le, Young-Koo Lee, Sungyoung Lee
Acoustic source positioning plays an important role in military tracking unwelcome objects. A system for this application must be capable of dealing with the input recorded convolved mixture signals while minimizing the high communication and computation cost. This paper describes a distributed system for positioning multiple independent moving sources relying on acoustic signals. The sensors pre-process the sensed data to obtain the frequency features before compressing and sending it to the base. At the base, the source positioning are carried out via two clustering stages and an optimization method. Analysis and simulation results show that our system provides high accuracy and needs neither much communication nor complex computation in a distributed manner. It is robust even when there exists high noise with Rayleigh multi-path fading under Doppler effect and when the number of independent sources is greater than the microphone number.
{"title":"Clustering based multi-object positioning system","authors":"V. Dang, T. Phan, Ba-Vui Le, Young-Koo Lee, Sungyoung Lee","doi":"10.1109/ATC.2011.6027431","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027431","url":null,"abstract":"Acoustic source positioning plays an important role in military tracking unwelcome objects. A system for this application must be capable of dealing with the input recorded convolved mixture signals while minimizing the high communication and computation cost. This paper describes a distributed system for positioning multiple independent moving sources relying on acoustic signals. The sensors pre-process the sensed data to obtain the frequency features before compressing and sending it to the base. At the base, the source positioning are carried out via two clustering stages and an optimization method. Analysis and simulation results show that our system provides high accuracy and needs neither much communication nor complex computation in a distributed manner. It is robust even when there exists high noise with Rayleigh multi-path fading under Doppler effect and when the number of independent sources is greater than the microphone number.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133313191","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027496
Tang Kai, Meng Qiao, Liu Haitao, Zhang Yi
High-speed CMOS Track-and-Hold (T&H) circuit is the key component in the high-speed Analog-to-Digital converter (ADC). It is difficult to implementation GSps T&H in 0.18µm CMOS because of the bandwidth limitation in the OPA. In this paper, a 3GSps open loop T&H circuit in 0.18µm CMOS technology is proposed. The distortions in track mode and injection charge error in the hold mode were analyzed. CMOS switch and a differential buffer are used to trade off the speed, accuracy and sensitivity. Simulation results show that setup time, aperture time, aperture error and voltage drop rate are 280ps, 23ps, less than 3ps and 0.9µV/µs respectively. The T&H can work up to 3GHz at 1.8V supply and it could be used in 3GSps flash ADC in 0.18µm CMOS process.
{"title":"3GSps Track-and-Hold circuit in 0.18µm CMOS process","authors":"Tang Kai, Meng Qiao, Liu Haitao, Zhang Yi","doi":"10.1109/ATC.2011.6027496","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027496","url":null,"abstract":"High-speed CMOS Track-and-Hold (T&H) circuit is the key component in the high-speed Analog-to-Digital converter (ADC). It is difficult to implementation GSps T&H in 0.18µm CMOS because of the bandwidth limitation in the OPA. In this paper, a 3GSps open loop T&H circuit in 0.18µm CMOS technology is proposed. The distortions in track mode and injection charge error in the hold mode were analyzed. CMOS switch and a differential buffer are used to trade off the speed, accuracy and sensitivity. Simulation results show that setup time, aperture time, aperture error and voltage drop rate are 280ps, 23ps, less than 3ps and 0.9µV/µs respectively. The T&H can work up to 3GHz at 1.8V supply and it could be used in 3GSps flash ADC in 0.18µm CMOS process.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117253892","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027497
Takuro Yoshida, D. Nojima, Y. Nagao, M. Kurosaki, H. Ochi
In direct conversion receiver, I/Q imbalance is caused by non orthogonality between in-phase component and quadrature-phase component caused by imperfections of quadrature demodulator. In addition, carrier frequency offset (CFO) occurs as well. In this paper, we present a register transfer level (RTL) design of joint CFO and I/Q imbalance compensator. First, we verify the efficiency of compensation algorithm with computer simulation, and then we show a bit error rate (BER) characteristic. After that, we made an RTL design to compensate CFO and I/Q imbalance.We also measure the efficiency of system in this step by looking at constellation of received signal. Finally, we implement the RTL design of compensation system in a field programmable gate array (FPGA). We show the effect of compensation system by simulation on RTL and verification on FPGA.
{"title":"FPGA implementation of joint CFO and IQ-imbalance compensator for narrow-band wireless system","authors":"Takuro Yoshida, D. Nojima, Y. Nagao, M. Kurosaki, H. Ochi","doi":"10.1109/ATC.2011.6027497","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027497","url":null,"abstract":"In direct conversion receiver, I/Q imbalance is caused by non orthogonality between in-phase component and quadrature-phase component caused by imperfections of quadrature demodulator. In addition, carrier frequency offset (CFO) occurs as well. In this paper, we present a register transfer level (RTL) design of joint CFO and I/Q imbalance compensator. First, we verify the efficiency of compensation algorithm with computer simulation, and then we show a bit error rate (BER) characteristic. After that, we made an RTL design to compensate CFO and I/Q imbalance.We also measure the efficiency of system in this step by looking at constellation of received signal. Finally, we implement the RTL design of compensation system in a field programmable gate array (FPGA). We show the effect of compensation system by simulation on RTL and verification on FPGA.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127501658","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027468
Van-Bien Pham, Weixing Sheng, X. Tran, T. Dinh
It is known that LTE systems do not fully support the Alamouti space-time code as the number of symbols per slot is not always an even number. Adapting to the case there is only three symbols per slot, Lei et al. proposed a class of quasi-orthogonal space time block codes (Q-STBC) for two transmit antennas and three time slots. This Q-STBC achieves some desirable properties of an STBC code such as full rate and full diversity. However, there are two drawbacks associated with it, namely, high decoding complexity due to pair-symbol maximum likelihood decoding and lack of maximum coding gain. Coping with these two issues we propose a class of STBC for three time slots and two transmit antennas with single-symbol maximum likelihood decoding. The proposed STBC also allows to achieve full-rate and full diversity. However, it is superior to Q-STBC in providing maximum coding gain while requiring lower decoding complexity.
{"title":"Full-rate full-diversity three-time-slot space-time block code with single-symbol ML decoding","authors":"Van-Bien Pham, Weixing Sheng, X. Tran, T. Dinh","doi":"10.1109/ATC.2011.6027468","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027468","url":null,"abstract":"It is known that LTE systems do not fully support the Alamouti space-time code as the number of symbols per slot is not always an even number. Adapting to the case there is only three symbols per slot, Lei et al. proposed a class of quasi-orthogonal space time block codes (Q-STBC) for two transmit antennas and three time slots. This Q-STBC achieves some desirable properties of an STBC code such as full rate and full diversity. However, there are two drawbacks associated with it, namely, high decoding complexity due to pair-symbol maximum likelihood decoding and lack of maximum coding gain. Coping with these two issues we propose a class of STBC for three time slots and two transmit antennas with single-symbol maximum likelihood decoding. The proposed STBC also allows to achieve full-rate and full diversity. However, it is superior to Q-STBC in providing maximum coding gain while requiring lower decoding complexity.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"383 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122350831","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 : 2011-09-26DOI: 10.1109/ATC.2011.6027462
Onsy Abdel Alim, S. Shaaban, M. Hamdy
This paper describes a novel radio access channel adaptive technique designed for the Long Term Evolution (LTE) VoIP codecs. In previous 3GPP releases, the circuit switched Adaptive Multi Rate (AMR) voice codec has proven robust performance under different radio channel conditions. With the 3GPP Release 8 LTE standards, the circuit switched domain is cancelled, making LTE an all IP system and VoIP the only way to carry voice. Despite that VoIP codecs are well developed for internet applications, these codecs are not designed to adapt according to the radio channel conditions, as in the case of AMR. With the new Adaptive Multi Lane (AML) approach, the system is to stream 1, 2 or 4 lanes of speech frames in parallel according to the radio channel conditions. Each lane has a different fractional speech frame delay increasing the probability of getting out of fading dips. The AML technique has been modeled and simulated over OMNET++ ver4.1 including the INET framework and VoIP tool extension. The VoIP tool has been modified to implement the lane selection algorithm. The resulting speech quality was evaluated using the ITU P.862 PESQ. Simulation results show improvement in the average PESQ MOS readings exceeding 44% compared to the normal single path model. We conclude that the AML is a useful technique for improving VoIP codecs performance in cellular systems.
{"title":"Adaptive Multi Lane technique for LTE radio access VoIP","authors":"Onsy Abdel Alim, S. Shaaban, M. Hamdy","doi":"10.1109/ATC.2011.6027462","DOIUrl":"https://doi.org/10.1109/ATC.2011.6027462","url":null,"abstract":"This paper describes a novel radio access channel adaptive technique designed for the Long Term Evolution (LTE) VoIP codecs. In previous 3GPP releases, the circuit switched Adaptive Multi Rate (AMR) voice codec has proven robust performance under different radio channel conditions. With the 3GPP Release 8 LTE standards, the circuit switched domain is cancelled, making LTE an all IP system and VoIP the only way to carry voice. Despite that VoIP codecs are well developed for internet applications, these codecs are not designed to adapt according to the radio channel conditions, as in the case of AMR. With the new Adaptive Multi Lane (AML) approach, the system is to stream 1, 2 or 4 lanes of speech frames in parallel according to the radio channel conditions. Each lane has a different fractional speech frame delay increasing the probability of getting out of fading dips. The AML technique has been modeled and simulated over OMNET++ ver4.1 including the INET framework and VoIP tool extension. The VoIP tool has been modified to implement the lane selection algorithm. The resulting speech quality was evaluated using the ITU P.862 PESQ. Simulation results show improvement in the average PESQ MOS readings exceeding 44% compared to the normal single path model. We conclude that the AML is a useful technique for improving VoIP codecs performance in cellular systems.","PeriodicalId":221905,"journal":{"name":"The 2011 International Conference on Advanced Technologies for Communications (ATC 2011)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124928433","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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