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An Adaptive Feedback Method with Channel Change Indication for Band AMC in a Femto Cell 带信道变化指示的Femto小区波段AMC自适应反馈方法
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073375
Changyoun Kim, Jaeki Lee, C. Nam, Jangho Yoon, Hwang-Soo Lee
{"title":"An Adaptive Feedback Method with Channel Change Indication for Band AMC in a Femto Cell","authors":"Changyoun Kim, Jaeki Lee, C. Nam, Jangho Yoon, Hwang-Soo Lee","doi":"10.1109/VETECS.2009.5073375","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073375","url":null,"abstract":"The band adaptive modulation and coding (band AMC) scheme is used in orthogonal frequency division multiple access (OFDMA) systems to increase mobile communication system throughput, however, an amount of feedback overhead degrades uplink system performance. In this paper, we propose an adaptive feedback method that can significantly reduce the amount of channel feedback information when a femto base station (BS) and mobile stations (MS) communicate in the band AMC mode. Since the channel variation of the MS in the femto cell is relatively small, instead of informing the femto BS of the channel quality information (CQI) periodically, MSs only send CQI feedback to the femto BS when channel condition changes above a threshold. Simulation results show that the proposed scheme can reduce feedback overhead up to 70 % without resulting in system throughput degradation compared to the conventional best-M feedback scheme.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"391 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116369321","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
Half-Duplex Relay-Help Transmission with Dirty Paper Coding 半双工中继帮助传输脏纸编码
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073574
Yuli Yang
{"title":"Half-Duplex Relay-Help Transmission with Dirty Paper Coding","authors":"Yuli Yang","doi":"10.1109/VETECS.2009.5073574","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073574","url":null,"abstract":"In this paper, we consider a half-duplex relay channel where the relay node cannot transmit and receive simul- taneously. The information to be transmitted at the source node is composed of relayed information and non-relayed information. They interfere with each other in the existing scheme when the relay node forwards the relayed information and simultaneously the source node transmits the non-relayed information. In order to improve the transmission reliability, we propose two schemes where the source node chooses the non-relayed information codeword in terms of dirty paper coding (DPC). In Scheme 1, DPC technique is applied during the listening phase; and in Scheme 2, DPC technique is applied during the cooperative phase. Specially, we discuss the capacity behaviors of the proposed schemes and compare them with the baseline, namely the capacity behaviors of the existing scheme without the application of DPC technique. The corresponding numerical results prove that both proposed schemes outperform the existing scheme in the sense of capacity performance.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121467216","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: 8
Total Power Control for Cooperative Base Stations Uplink 合作基站上行链路的总功率控制
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073887
S. Bavarian, J. Cavers
{"title":"Total Power Control for Cooperative Base Stations Uplink","authors":"S. Bavarian, J. Cavers","doi":"10.1109/VETECS.2009.5073887","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073887","url":null,"abstract":"In this paper, we introduce a novel power control strategy based on the total received power in the uplink of cooperative base stations (CBSs). Power control via channel inversion is common practice in the uplink of cellular systems as it maintains constant received signal power at the controlling base station (BS) regardless of the position of the mobile station (MS). Unlike the conventional cellular system, CBSs share information in detecting the MSs and they are shown to increase the system capacity. We propose a power control approach based on sustaining the total received power in CBSs. We investigate the performance of this method through simulations and show that it reduces the intercell interference in the CBS systems, saves power and improves the BER performance in both coded and uncoded scenarios.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124342872","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
Outage-Optimal Transmit Antenna Selection for Cooperative Decode-and-Forward Systems 协同译码转发系统的中断最优发射天线选择
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073760
Andreas Müller, J. Speidel
{"title":"Outage-Optimal Transmit Antenna Selection for Cooperative Decode-and-Forward Systems","authors":"Andreas Müller, J. Speidel","doi":"10.1109/VETECS.2009.5073760","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073760","url":null,"abstract":"We propose and analyze three different transmit antenna selection schemes for cooperative diversity systems with regenerative relays. Our goal is to minimize the information out- age probability by properly selecting one out of several available antenna elements at the source node. This problem is generally more involved than transmit antenna selection for conventional single-hop systems since the selection of a certain antenna element affects always both the source-to-relay as well as the source-to- destination link. The various schemes that we present are based upon different kinds of channel state information and we analyze all of them in terms of the achievable outage probability as well as the asymptotic behavior in the high SNR regime. In this paper, we propose and analyze various strategies for selecting an appropriate transmit antenna at the source node of a cooperative diversity system with a regenerative decode-and- forward relay. The different schemes are based upon different kinds of channel state information (csi) and they are optimal in terms of minimizing the outage probability between source and destination conditioned on the available csi. We derive generic expressions for the corresponding outage performance for arbitrary channel distributions and we explicitly present closed-form expressions for the important case of Rayleigh fading on all links. Furthermore, we investigate the asymptotic behavior of all schemes in the high signal-to-noise ratio (SNR) regime and we quantify the achievable diversity order.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124510787","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: 8
Polarimetric Measurements for Spatial Wideband MIMO Channels 空间宽带MIMO信道的极化测量
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073806
F. Quitin, Claude Oestges, F. Horlin, P. D. Doncker
{"title":"Polarimetric Measurements for Spatial Wideband MIMO Channels","authors":"F. Quitin, Claude Oestges, F. Horlin, P. D. Doncker","doi":"10.1109/VETECS.2009.5073806","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073806","url":null,"abstract":"This paper investigates the polarization behaviour of indoor multi-polarized MIMO channels at 3.6 GHz. Measurements have been carried out in non-line-of-sight (NLOS) and line-of-sight (LOS) using a dual-polarized transmitter and a tri-polarized receiver. The spatial and delay characteristics are extracted using a per-tap beamforming algorithm. Distinct waves are isolated and the polarization of each wave is expressed in terms of its spherical components. The evolution of the waves polarization is investigated as function of its physical propagation parameters. The polarization of the waves is shown to be sensitive to spatial characteristics, while being insensitive to delay. Direct line-of-sight rays show to have higher XPD than in the NLOS case, while the reflected rays have a similar XPD than in a NLOS case.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128092002","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
Improved PTS Method with New Weighting Factor Technique for OFDM Signal 基于新加权因子技术的OFDM信号改进PTS方法
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073594
Pornpawit Boonsrimuang, Sunisa Sanpan, P. Boonsrimuang, T. Paungma, Hideo Kobayashi
{"title":"Improved PTS Method with New Weighting Factor Technique for OFDM Signal","authors":"Pornpawit Boonsrimuang, Sunisa Sanpan, P. Boonsrimuang, T. Paungma, Hideo Kobayashi","doi":"10.1109/VETECS.2009.5073594","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073594","url":null,"abstract":"Partial Transmit Sequence (PTS) method is a well - known method which can reduce the peak-to-average ratio (PAPR) for an OFDM signal. A major drawback of PTS method is its higher computation complexity due to the necessity of larger number of inverse fast Fourier transforms (IFFT). The PTS method with low computation complexity, called decomposition PTS sub-blocking was proposed [1] which employs the radix-*- inverse fast Fourier transform (IFFT) for the signals at the middle stages of an TV-point radix-*- IFFT and decimation in frequency (DIF) domain. This method (DIF-IFFT) can reduce the computation complexity relatively while providing PAPR reduction similar to other PTS techniques. On the other hand, PTS method can improve PAPR reduction performance very well as increasing a number of weighting factors and clusters. However, the size of side information proportionally increases as increasing the number of weighting factors or/and clutters, which are required to inform the side information to the receiver for recovering the original data. In this paper, we propose the new weighting factor technique in conjunction with D-PTS sub-blocking technique which can improve both the PAPR performance and computation complexity without any increasing of side information.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121935986","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: 5
A Reliable and Efficient MAC Layer Multicast Protocol in Wireless LANs
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073335
Xiaoli Wang, Lan Wang, Yingjie Wang, Yongsheng Zhang
{"title":"A Reliable and Efficient MAC Layer Multicast Protocol in Wireless LANs","authors":"Xiaoli Wang, Lan Wang, Yingjie Wang, Yongsheng Zhang","doi":"10.1109/VETECS.2009.5073335","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073335","url":null,"abstract":"In IEEE 802.11, multicast protocol is based on the basic access procedure of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). This protocol does not provide any recovery mechanism for multicast frames. As a result, transmitted multicast frames may be lost due to collisions or errors. Recently, several reliable multicast protocols at MAC layer have been proposed for 802.11. They can be classified into two categories: one is based on negative feedback (NFB-based) and the other is based on positive feedback (PFB-based). After analyzing the problems with existing reliable multicast MAC protocols, we propose a novel PFB-based multicast protocol, namely DPMM (Double Piggyback Mode Multicast). The protocol piggybacks the ACK in the CTS frame and piggybacks the priority information in the DATA frames. With DPMM, ACK packets are eliminated and collisions of control frames are avoided. A grouping algorithm using RSS (Received signal strength) measurement is also developed to further improve upon DPMM. Simulation results, using the OPNET, confirm that the improvements are encouraging.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122284702","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: 5
A Vector Perturbation Technique Based on Eigenvalue Normalization for Multi-User MIMO Downlink 基于特征值归一化的多用户MIMO下行信道矢量摄动技术
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073352
Hyungjoon Song, Dongyoung Kwon, Sungmook Lim, Sungsoo Park, D. Hong
{"title":"A Vector Perturbation Technique Based on Eigenvalue Normalization for Multi-User MIMO Downlink","authors":"Hyungjoon Song, Dongyoung Kwon, Sungmook Lim, Sungsoo Park, D. Hong","doi":"10.1109/VETECS.2009.5073352","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073352","url":null,"abstract":"We investigate a non-linear precoding techniques for multi-user multiple-input multiple-output (MU-MIMO) down- link. When assuming full knowledge of the channel state informa- tion at the transmitter, a vector perturbation (VP) is a promising precoding scheme that approaches sum capacity and has simple receiver. However, its encoding is nondeterministic polynomial time (NP)-hard problem. In the MU-MIMO downlink, this encoding problem becomes harder because the proper user selection must be considered. In this paper, we propose a new vector perturbation scheme based on eigenvalue normalization (VPEVN), which converts the NP-hard problem into a channel condition-based finite integer problem, resulting in a reduction of encoding complexity. In addition, it can select a good user set by simple maximum norm criterion owing to its orthogonalization effect. Index Terms—MIMO broadcast channel, multi-user MIMO, precoding, vector perturbation, eigen decomposition","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115883748","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 Amplify and Forward Based Cooperative Diversity in MIMO Relay Channels MIMO中继信道中放大和前向协同分集性能分析
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073773
Vijay Ganwani, B. Dey, G. Sharma, S. Merchant, U. Desai
{"title":"Performance Analysis of Amplify and Forward Based Cooperative Diversity in MIMO Relay Channels","authors":"Vijay Ganwani, B. Dey, G. Sharma, S. Merchant, U. Desai","doi":"10.1109/VETECS.2009.5073773","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073773","url":null,"abstract":"Tight closed form lower bounds for the average bit error rate (BER) are derived for a dual hop cooperative network employing nonregenerative relays for the multiple input multiple output (MIMO) relay channel experiencing Rayleigh fading. The bounds are obtained for three different nonregenerative relaying schemes. The lower bounds for the BER are obtained using the moment generating function (MGF) approach by evaluating the MGF of the end-to-end equivalent signal to noise ratio (SNR) of the system. From the BER expressions obtained, we also show that the diversity order for the MIMO relay cooperative system with each relay having M antennas increases approximately by a factor M from that of a system with single-antenna relays. Simulation results confirm that the analytical expressions for the lower bounds are very tight and can thus be used to get approximate values of the BER.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132113313","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: 18
Reinforcement Learning for Load Management in DiffServ-MPLS Mobile Networks DiffServ-MPLS移动网络负载管理的强化学习
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference Pub Date : 2009-04-26 DOI: 10.1109/VETECS.2009.5073831
N. Vucevic, J. Pérez-Romero, O. Sallent, R. Agustí
{"title":"Reinforcement Learning for Load Management in DiffServ-MPLS Mobile Networks","authors":"N. Vucevic, J. Pérez-Romero, O. Sallent, R. Agustí","doi":"10.1109/VETECS.2009.5073831","DOIUrl":"https://doi.org/10.1109/VETECS.2009.5073831","url":null,"abstract":"Cognitive networks are envisaged to provide op- timized resource usage in future. While heterogeneity and re- source scarcity draw research attention to the wireless part, the rest of the network (mobile backhaul) is rarely considered for these improvements. The future of next generation wireless networks is probable to be all-IP, where a common flexible infrastructure is looking for dynamic autonomous solutions that cognition may provide. This work proposes a novel solution, where the introduction of reinforcement learning over multiprotocol label switching (MPLS) in a differentiated services (DiffServ) mobile backhaul should provide autonomous network adaptation aiming at en- hanced QoS capabilities. The proposed solution enables intel- ligent traffic routing by means of distributed reinforcement learning agents that base decisions on edge-gained experience. Index Terms—all-IP, DiffServ, MPLS, QoS, reinforcement learning.","PeriodicalId":253546,"journal":{"name":"VTC Spring 2009 - IEEE 69th Vehicular Technology Conference","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134390073","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
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