2012 IEEE Wireless Communications and Networking Conference (WCNC)最新文献_第2页

Variational Bayesian framework for receiver design in the presence of phase noise in MIMO systems MIMO系统中存在相位噪声时接收机设计的变分贝叶斯框架

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214388

R. Krishnan, M. Khanzadi, L. Svensson, T. Eriksson, T. Svensson

引用次数: 23

Relay selection for modulation-adaptive opportunistic DF relaying using mixed channel knowledge 利用混合信道知识调制自适应机会DF中继的中继选择

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214204

Chuyi Qian, Y. Ma, R. Tafazolli

引用次数: 1

An early termination-based improved algorithm for fixed-complexity sphere decoder 一种基于早期终止的固定复杂度球面解码器改进算法

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214444

Guanghui Li, Xin Zhang, Sheng Lei, Cong Xiong, Dacheng Yang

引用次数: 8

Lightweight secure global time synchronization for Wireless Sensor Networks 无线传感器网络的轻型安全全球时间同步

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214179

Yongsheng Liu, Jie Li, M. Guizani

{"title":"Lightweight secure global time synchronization for Wireless Sensor Networks","authors":"Yongsheng Liu, Jie Li, M. Guizani","doi":"10.1109/WCNC.2012.6214179","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214179","url":null,"abstract":"Time synchronization is crucial to Wireless Sensor Networks (WSNs) due to the requirement of coordination between sensor nodes. Existing secure time synchronization protocols of WSNs introduce high overhead when used for global time synchronization. In this paper, we propose a lightweight secure global time synchronization protocol for WSNs. In the proposed protocol, a broadcast synchronization packet makes all sensor nodes in the network synchronize with the trusted source. The synchronization packet is protected by a proposed broadcast authentication algorithm, which introduces asymmetry by transmitting hash values of secret keys in advance. It achieves immediate authentication and does not require the loose time synchronization. To defend the pulse-delay attacks, the arrival time of the synchronization packet is checked according to the estimated arrival time interval. The upper bound on the skew of the proposed protocol is proved. The message complexity in one period of the proposed protocol is O(n) where n represents the number of sensor nodes. The simulation results show that the maximum skew is within tens of milliseconds.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"80 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116527785","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: 17

Throughput performance optimization in cognitive radio networks under Rayleigh fading 瑞利衰落下认知无线网络吞吐量性能优化

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214001

Hyeonje Cho, G. Hwang

引用次数: 3

An improved method for estimating the frequency correlation function 一种估计频率相关函数的改进方法

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6213930

A. Chelli, M. Pätzold

{"title":"An improved method for estimating the frequency correlation function","authors":"A. Chelli, M. Pätzold","doi":"10.1109/WCNC.2012.6213930","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6213930","url":null,"abstract":"For time-invariant frequency-selective channels, the transfer function is a superposition of waves having different propagation delays and path gains. In order to estimate the frequency correlation function (FCF) of such channels, the frequency averaging technique can be utilized. The obtained FCF can be expressed as a sum of auto-terms (ATs) and cross-terms (CTs). The ATs are caused by the autocorrelation of individual path components. The CTs are due to the cross-correlation of different path components. These CTs have no physical meaning and leads to an estimation error. We propose a new estimation method aiming to improve the estimation accuracy of the FCF of a band-limited transfer function. The basic idea behind the proposed method is to introduce a kernel function aiming to reduce the CT effect, while preserving the ATs. In this way, we can improve the estimation of the FCF. The performance of the proposed method and the frequency averaging technique is analyzed using a synthetically generated transfer function. We show that the proposed method is more accurate than the frequency averaging technique. The accurate estimation of the FCF is crucial for the system design. In fact, we can determine the coherence bandwidth from the FCF. The exact knowledge of the coherence bandwidth is beneficial in both the design as well as optimization of frequency interleaving and pilot arrangement schemes.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114391317","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

Femtocell downlink power control based on Radio Environment Maps 基于无线电环境图的飞蜂窝下行功率控制

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6213964

A. Zalonis, N. Dimitriou, A. Polydoros, J. Nasreddine, P. Mähönen

引用次数: 27

Distributed resource optimization in multicell OFDMA networks 多小区OFDMA网络中的分布式资源优化

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6213982

Mohammad Fathi, E. Karipidis

引用次数: 6

Multi-objective routing optimization using evolutionary algorithms 基于进化算法的多目标路由优化

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214324

Halil Yetgin, Kent Tsz Kan Cheung, L. Hanzo

{"title":"Multi-objective routing optimization using evolutionary algorithms","authors":"Halil Yetgin, Kent Tsz Kan Cheung, L. Hanzo","doi":"10.1109/WCNC.2012.6214324","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214324","url":null,"abstract":"Wireless ad hoc networks suffer from several limitations, such as routing failures, potentially excessive bandwidth requirements, computational constraints and limited storage capability. Their routing strategy plays a significant role in determining the overall performance of the multi-hop network. However, in conventional network design only one of the desired routing-related objectives is optimized, while other objectives are typically assumed to be the constraints imposed on the problem. In this paper, we invoke the Non-dominated Sorting based Genetic Algorithm-II (NSGA-II) and the MultiObjective Differential Evolution (MODE) algorithm for finding optimal routes from a given source to a given destination in the face of conflicting design objectives, such as the dissipated energy and the end-to-end delay in a fully-connected arbitrary multi-hop network. Our simulation results show that both the NSGA-II and MODE algorithms are efficient in solving these routing problems and are capable of finding the Pareto-optimal solutions at lower complexity than the `brute-force' exhaustive search, when the number of nodes is higher than or equal to 10. Additionally, we demonstrate that at the same complexity, the MODE algorithm is capable of finding solutions closer to the Pareto front and typically, converges faster than the NSGA-II algorithm.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128347326","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: 53

Performance comparison of downlink user multiplexing schemes in IEEE 802.11ac: Multi-user MIMO vs. frame aggregation IEEE 802.11ac下行链路用户复用方案的性能比较:多用户MIMO与帧聚合

2012 IEEE Wireless Communications and Networking Conference (WCNC) Pub Date : 2012-04-01 DOI: 10.1109/WCNC.2012.6214021

Jiyoung Cha, Hu Jin, B. Jung, D. Sung

{"title":"Performance comparison of downlink user multiplexing schemes in IEEE 802.11ac: Multi-user MIMO vs. frame aggregation","authors":"Jiyoung Cha, Hu Jin, B. Jung, D. Sung","doi":"10.1109/WCNC.2012.6214021","DOIUrl":"https://doi.org/10.1109/WCNC.2012.6214021","url":null,"abstract":"IEEE 802.11ac standard has newly adopted a downlink multi-user multiple-input and multiple-output (DL-MU-MIMO) scheme. For user multiplexing in downlink WLAN, we can also use a frame aggregation scheme for multiplexing multiple users' data with space-time block coding (STBC) for achieving spatial diversity. We compare the performance of the two downlink user multiplexing schemes: multi-user MIMO and frame aggregation in IEEE 802.11ac. If each user's encoded data stream has a similar length, the multi-user MIMO scheme yields better average throughput than the frame aggregation scheme. On the other hand, if each user's encoded data stream has a different length, the frame aggregation scheme outperforms the multi-user MIMO scheme in terms of average throughput. In a fast-varying channel, the multi-user MIMO scheme yields worse throughput due to the channel feedback overhead, compared to that with the frame aggregation scheme. We also observe that the multi-user frame aggregation scheme with STBC always outperforms a single-user transmission scheme with STBC in terms of average throughput due to enhanced MAC layer efficiency through frame aggregation.","PeriodicalId":329194,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference (WCNC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128369968","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: 38