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2-norm condition number based switching algorithm in MIMO OFDM systems MIMO OFDM系统中基于2范数条件数的交换算法
The Second International Conference on Communications and Networking Pub Date : 2010-11-23 DOI: 10.1109/COMNET.2010.5699832
Y. Mlayeh, F. Tlili, A. Ghazel, A. Nafkha
{"title":"2-norm condition number based switching algorithm in MIMO OFDM systems","authors":"Y. Mlayeh, F. Tlili, A. Ghazel, A. Nafkha","doi":"10.1109/COMNET.2010.5699832","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699832","url":null,"abstract":"Performances and capacity of MIMO-OFDM systems are enhanced with adaptive MIMO techniques such as Demmel condition number based switching algorithm. In this paper we show that the complexity of this algorithm can be reduced by using the 2-norm condition number of the channel matrix as the selection metric. Simulation results show that using this selection criterion, the switching algorithm offers the same performances obtained when using the Demmel condition number.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131018378","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}
引用次数: 2
Optimization of training-based channel estimation for OFDM/OQAM systems operating on highly time-frequency dispersive channels 基于训练的高时频色散OFDM/OQAM系统信道估计优化
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699829
Besma Lahami, M. Siala, I. Kammoun
{"title":"Optimization of training-based channel estimation for OFDM/OQAM systems operating on highly time-frequency dispersive channels","authors":"Besma Lahami, M. Siala, I. Kammoun","doi":"10.1109/COMNET.2010.5699829","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699829","url":null,"abstract":"Offset QAM orthogonal frequency division multiplexing (OFDM/OQAM) is a promising technique for high data rate next generation cellular systems, operating on highly time-frequency dispersive channels. To combat dispersive channel interference, OFDM/OQAM systems allow very well time and frequency localized prototype functions. The good localization of the prototype function results from the separation of the transmission of the in-phase and quadrature phase components. Unfortunately, this separation introduces a crosstalk between these components when imperfect channel estimation is used to demodulate transmitted data. The main goal of this paper is the enhancement of channel estimation quality for OFDM/OQAM systems through the minimization of this crosstalk. Our approach consists in introducing a number of optimum linear constraints on neighbors of pilot symbols used to estimate the channel. The optimality of these components is related to a minimization of the residual interference mean power. In our study, for the representation of the signal space of our OFDM/OQAM system, we consider both square and hexagonal lattices in the time-frequency plane.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"292 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123466745","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}
引用次数: 4
Adjusting TCP sending rate after timeouts events in ad hoc networks 调整ad hoc网络中TCP超时后的发送速率
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699817
Haifa Touati, Ilhem Lengliz, F. Kamoun
{"title":"Adjusting TCP sending rate after timeouts events in ad hoc networks","authors":"Haifa Touati, Ilhem Lengliz, F. Kamoun","doi":"10.1109/COMNET.2010.5699817","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699817","url":null,"abstract":"In multihop ad hoc networks, TCP cannot effectively deal with the problem of packet drops caused by mobility and shared channel contention among wireless nodes. Mistaking these events for congestion degrades TCP performance. Hence we propose a new end-to-end mechanism, called TCP with Adaptive RTO+ (TCP-AR+), to assure faster recovery after non-congestion induced timeouts. TCP-AR+ comes to enhance the TCP-AR mechanism, we proposed previously. TCP-AR+ is a sender side only modification of the standard congestion control algorithm. It relies on three concepts. First, it distinguishes routes failures from network congestion based on transport layer feedbacks. Second, during timeout, it adjusts the RTO's value to network conditions and finally, after route re-establishment, it sets the congestion window's value according to the offered rate of the new path. We evaluate this new technique using different simulations scenarios, to compare its throughput gain, fairness and friendliness to those of TCP New Reno and TCP AR.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123478729","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}
引用次数: 1
Improving the performance of ARQ protocols over AWGN channels using an optimized energy allocation 利用优化的能量分配提高AWGN信道上ARQ协议的性能
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699826
Bessem Kaddour, M. Siala, H. Boujemaa
{"title":"Improving the performance of ARQ protocols over AWGN channels using an optimized energy allocation","authors":"Bessem Kaddour, M. Siala, H. Boujemaa","doi":"10.1109/COMNET.2010.5699826","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699826","url":null,"abstract":"In this paper, we propose an improvement of truncated ARQ protocol throughput through the optimization of the distribution of the average energy cost per packet (or, equivalently, per symbol) among all packet transmission attempts. We consider exclusively BPSK-modulated ARQ transmission over an AWGN channel, with and without packet combining using the selective repeat as a transmission protocol. Our optimisation approach is based on a specific choice of the symbol energy of packets during transmission attempts (first transmission and potential subsequent retransmissions), while keeping the total energy cost per transmitted packet (or, equivalently, per symbol fixed. For a given Signal-to-Noise Ratio, the optimum distribution of the total energy cost among packet transmission attempts is obtained using a dichotomy search. Numerical results show that the energy distribution is almost surely unevenly distributed among packet transmission attempts. More specifically, for low SNR, almost most of the total energy is allocated to the first transmission while for large SNR, the allocated energy keep increasing with unsuccessful retransmission attempts. Numerical results also reveal a significant improvement, for medium SNR, of both throughput and packet erasure rate, relatively to conventional ARQ.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127592253","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}
引用次数: 3
A truncated-HARQ based random access protocol for wireless slotted ALOHA MIMO systems 基于截断harq的无线开槽ALOHA MIMO系统随机访问协议
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699828
Nejah Missaoui, I. Kammoun, M. Siala
{"title":"A truncated-HARQ based random access protocol for wireless slotted ALOHA MIMO systems","authors":"Nejah Missaoui, I. Kammoun, M. Siala","doi":"10.1109/COMNET.2010.5699828","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699828","url":null,"abstract":"Packet collision resolution is proved to be a promising approach to improve the performance of slotted ALOHA protocol with TDMA technique. In the present paper, we propose a random access protocol that utilizes an efficient Spatial Successive Interference Canceller (SSIC) to separate collided packets for users that share the same time slot and that utilizes the benefits of retransmitted packets combining. We consider a truncated Hybrid automatic repeat-request (HARQ) scheme where the number of retransmissions is limited. Moreover, for the SSIC, we give a solution for the problem of very close powers of collided packets by using a simple linear processing for its initialization. We evaluate the throughput of the system over Rayleigh fading channel using the proposed protocol. The simulation results show that we obtain an efficient random access method with high throughput for wireless transmission.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122983675","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}
引用次数: 0
Adaptive algorithm for Admission Control in wireless networks 无线网络中准入控制的自适应算法
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699824
A. Saddoud, Lamia Fourati Chaari, L. Kamoun
{"title":"Adaptive algorithm for Admission Control in wireless networks","authors":"A. Saddoud, Lamia Fourati Chaari, L. Kamoun","doi":"10.1109/COMNET.2010.5699824","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699824","url":null,"abstract":"Real time multimedia applications become an important part of Internet traffic and require a guaranteed quality of services. Call Admission Control (CAC) is a key element in the provision of guaranteed (QoS) in wireless networks. An adaptive algorithm is proposed in this paper. The QoS measures studied are new call blocking probability and handoff call probability. We describe and we compare several adaptive admission control schemes in terms of performance and complexity. Also, maintaining the blocking probability below a certain value (threshold) adaptively to QoS requirements is the common purpose of the proposed CAC algorithm. The bandwidth resources allocated to handoff calls and new calls change dynamically in order to maintain the threshold of the call blocking probabilities.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114953240","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}
引用次数: 1
A global service level guarantee in NGN networks NGN网络的全球服务水平保证
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699814
M. Chalouf, F. Krief, N. Mbarek
{"title":"A global service level guarantee in NGN networks","authors":"M. Chalouf, F. Krief, N. Mbarek","doi":"10.1109/COMNET.2010.5699814","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699814","url":null,"abstract":"In this paper, we propose an end-to-end service level negotiation protocol which enables a global service offer covering quality of service (QoS) and security while taking into account user's mobility in this offer. This protocol provides all the domains involved in the transport of a various offered services with a negotiation capability to achieve an agreement on a service level. This paper shows also results of measurements evaluating the performances of the considered negotiation protocol and security impact on QoS.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121785543","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}
引用次数: 0
Evaluating the forwarding plane performance of the commodity hardware virtual routers 评估商用硬件虚拟路由器的转发平面性能
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699825
M. Bourguiba, K. Haddadou, G. Pujolle
{"title":"Evaluating the forwarding plane performance of the commodity hardware virtual routers","authors":"M. Bourguiba, K. Haddadou, G. Pujolle","doi":"10.1109/COMNET.2010.5699825","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699825","url":null,"abstract":"With the resurgent interest in virtualisation, router virtualisation seems the next step to servers virtualisation. It is also a key in deploying flexible and isolated virtual networks. In this paper, we evaluate Xen-based virtual routers on top of commodity hardware. Forwarding being achieved through the driver domain networking model, we identify and analyze the throughput limitation through profiling the CPU usage and the memory accesses. In multi-core systems, the memory access latencies are then the bottleneck. Then, we propose in this context a mechanism that classifies packets and schedules them so as to guarantee them the maximum throughput and the minimum delay based on the priority they are assigned.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"480 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134252925","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}
引用次数: 1
Performance analysis of adaptive modulation in cooperative networks 协作网络中自适应调制的性能分析
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699830
Imen Sahnoun, I. Kammoun, M. Siala
{"title":"Performance analysis of adaptive modulation in cooperative networks","authors":"Imen Sahnoun, I. Kammoun, M. Siala","doi":"10.1109/COMNET.2010.5699830","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699830","url":null,"abstract":"In cooperative networks, different single-antenna terminals cooperate in order to provide better signal quality over Rayleigh fading channels. The main drawback of cooperative diversity is the throughput loss due to the extra resources needed for relaying. Therefore, we propose to use adaptive modulation in cooperative networks in order to compensate the throughput loss due to the relaying. In this paper, we analyze the performance of different cooperative schemes using adaptive modulation. For cooperative schemes, we consider amplify and forward (AF) protocol with one relay, AF protocol with two relays and AF protocol based on the Alamouti space-time code. For the adaptive modulation, we propose a novel criterion for the determination of the decision table for the modulation choice. Simulation results show that, in bad channel conditions, these adaptive protocols have better performance compared with the classical system with direct transmission.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355329","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}
引用次数: 2
Reducing handoff dropping probability in 3GPP LTE network 降低3GPP LTE网络中的切换丢失概率
The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699816
Ben Ali Khitem, F. Zarai, L. Kamoun
{"title":"Reducing handoff dropping probability in 3GPP LTE network","authors":"Ben Ali Khitem, F. Zarai, L. Kamoun","doi":"10.1109/COMNET.2010.5699816","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699816","url":null,"abstract":"In this paper, we propose new methods to reduce the handoff blocking probability in LTE wireless networks. This reduction is based on an adaptive call admission control scheme that provides quality of service (QoS) guarantees and gives the priority of handoff call (HC) over new call (NC) in admission. The performances of the proposed schemes are compared with other method by simulation. Our new method reduces not only the handoff dropping probability, but also maintains a low new call blocking probability. On the other hand, it maintains efficient resource utilization.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115188474","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}
引用次数: 12
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