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2014 IEEE Wireless Communications and Networking Conference (WCNC)最新文献

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Spectrum sharing via HARQ feedback and adaptive power allocation 通过HARQ反馈和自适应功率分配实现频谱共享
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6952249
Behrooz Makki, T. Eriksson, T. Svensson
Recently, substantial attention has been paid to improve the spectral efficiency of communication setups using different spectrum sharing techniques. This paper studies the throughput of spectrum sharing channels utilizing hybrid automatic repeat request (HARQ) protocols. Considering different HARQ schemes, the unlicensed user throughput is obtained under an outage probability constraint for the licensed user. The outage-limited throughput is obtained for both independent and spatially-correlated fading conditions, where there is spatial dependency between the fading coefficients. The results show that, using HARQ and adaptive power allocation, the maximum throughput is achieved by combination of simultaneous transmission and interference-avoiding spectrum sharing paradigms. The performance of the spectrum sharing networks is not sensitive to spatial correlation, within the practical range, and the throughput changes are negligible at low/moderate correlations. Finally, there is considerable potential for data transmission of the unlicensed user with limited performance degradation of the licensed user.
近年来,利用不同的频谱共享技术来提高通信装置的频谱效率受到了广泛的关注。本文研究了基于混合自动重复请求(HARQ)协议的频谱共享信道的吞吐量。考虑不同的HARQ方案,得到了在许可用户中断概率约束下的非许可用户吞吐量。在独立衰落条件和空间相关衰落条件下,衰落系数之间存在空间依赖关系,得到了限断吞吐量。结果表明,采用HARQ和自适应功率分配,同时传输和避免干扰的频谱共享模式相结合,实现了最大吞吐量。频谱共享网络的性能对空间相关性不敏感,在实际范围内,在低/中等相关性下,吞吐量变化可以忽略不计。最后,在许可用户性能下降有限的情况下,未许可用户的数据传输具有相当大的潜力。
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引用次数: 1
Performance analysis of general order selection in decentralized cognitive radio networks 分散认知无线电网络中一般阶数选择的性能分析
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6952527
Mahmoud Elsaadany, T. Khattab
In this paper, we consider an underlay secondary network comprising of K transmitter-receiver pairs sharing the spectrum of a primary network, which is divided into n non-overlapping frequency bands (subchannels). Each secondary pair can communicate over only one subchannel and should keep the interference generated to the primary network below a threshold. A decentralized multiple access algorithm is used by the secondary pairs to select a proper subchannel. We study the performance of a modified version of the medium access control (MAC) protocol proposed by Elkashlan et al., referred to as the general order selection algorithm. We obtain the statistics of the output signal-to-noise ratio of the algorithm, and the statistics of the achievable capacity per secondary pair. Closed-form expressions for the outage probability, average bit error rate of the secondary users, and the aggregate throughput of the secondary network are derived. Assessment of the analytical work of this paper is done through comparisons with simulation.
在本文中,我们考虑了一个由共享主网络频谱的K个发送-接收对组成的底层辅助网络,该网络被划分为n个不重叠的频带(子信道)。每个辅助对只能在一个子信道上通信,并应使对主网络产生的干扰低于阈值。从信道对采用分散式多址访问算法选择合适的子信道。我们研究了Elkashlan等人提出的介质访问控制(MAC)协议的改进版本的性能,称为通用顺序选择算法。得到了算法输出信噪比的统计信息,以及每副副对可实现容量的统计信息。导出了二级网络的中断概率、平均误码率和总吞吐量的封闭表达式。通过与仿真的比较,对本文的分析工作进行了评价。
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引用次数: 1
Relay selection and power allocation with minimum rate guarantees for cognitive radio systems 认知无线电系统最小速率保证中继选择与功率分配
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6953029
Yang Yu, Chaowei Wang, Weidong Wang, Yinghai Zhang
This paper investigates joint relay selection (RS) and power allocation (PA) in cognitive radio (CR) systems, in which relay nodes operate in amplify-and-forward (AF) mode. In contrast to the conventional schemes, we take into account the performance of the secondary user (SU) which acts as the relay. A two-step optimization scheme is proposed to maximize system throughput with minimum rate guarantees for the source and the relay while the interference introduced to the primary user (PU) is kept below a specified threshold. The PA optimization in the first step is non-convex, and hence hard to solve in general. To tackle this, we introduce a power proportionality factor at the relay to decompose the non-convex optimization into two levels. Based on dual method and search method at inner level and outer level respectively, a closed-form solution for the optimal PA between the source and the relay is derived. In order to reduce complexity of repeating the PA procedures at all the relay candidates while maintaining reasonable performance, we also develop a suboptimal approach. Furthermore, simulation results and comparisons are presented to illustrate the performance of the proposed scheme.
研究了认知无线电(CR)系统中中继节点以放大转发(AF)方式工作的中继选择(RS)和功率分配(PA)。与传统方案相比,我们考虑了作为中继的辅助用户(SU)的性能。提出了一种两步优化方案,以最大限度地提高系统吞吐量,同时保证源和中继的最小速率,同时使引入主用户(PU)的干扰保持在指定阈值以下。第一步的PA优化是非凸的,因此通常很难求解。为了解决这个问题,我们在继电器中引入了一个功率比例因子,将非凸优化分解为两个层次。基于对偶法和内外级搜索法,推导出源与继电器之间最优PA的封闭解。为了减少在所有候选中继上重复PA过程的复杂性,同时保持合理的性能,我们还开发了一种次优方法。最后,给出了仿真结果和比较来说明所提方案的性能。
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引用次数: 5
Novel modulation detection scheme for underwater acoustic communication signal through short-time detailed cyclostationary features 基于短时精细周期平稳特征的水声通信信号调制检测新方案
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6952120
Xue Li, Qian Han, Zhiqiang Liu, Zhiqiang Wu
In this paper, we propose a new method for blind modulation detection based on detailed second order cyclostationary features for underwater acoustic communication. Due to the severe and fast varying Doppler shift and phase noise in the underwater acoustic communication channel, much shorter signal length can be used to detection the modulation scheme, leading to less accuracy in the modulation detection performance. Here we propose a brand new method to perform modulation detection: by analyzing the zoomed-in spectral coherence function (SOF) of short time signal, we observe distinctive detailed features for different modulations. Taking advantage of such detailed features in short time SOF, we design a novel blind modulation detection algorithm for underwater acoustic communication system. To the best of our knowledge, our paper is the first to employ such detailed, in some sense hidden, features of cyclostationary analysis to conduct modulation detection. Coupled with our previous work on blind carrier frequency estimation and symbol rate estimation algorithms, the proposed modulation detection algorithm enjoys very high detection accuracy, high speed, and low complexity. Real experimental data collected at sea are used to validate the effectiveness of the proposed algorithm. It is also important to note that the proposed method does not assume any a priori knowledge of the target signal.
本文提出了一种基于水声通信二阶环平稳特征的盲调制检测方法。由于水声通信信道中存在严重且快速变化的多普勒频移和相位噪声,因此可以使用较短的信号长度来检测调制方案,从而导致调制检测性能的准确性较低。本文提出了一种全新的调制检测方法:通过分析短时信号的放大光谱相干函数(SOF),观察到不同调制方式下不同的细节特征。利用短波软频的这些细节特征,设计了一种新的水声通信系统盲调制检测算法。据我们所知,我们的论文是第一个使用如此详细的,在某种意义上隐藏的,周期平稳分析的特征来进行调制检测。结合我们之前的盲载波频率估计和符号速率估计算法,本文提出的调制检测算法具有很高的检测精度、较高的速度和较低的复杂度。利用海上实测数据验证了该算法的有效性。同样重要的是要注意,所提出的方法不假设目标信号的任何先验知识。
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引用次数: 10
Distributed space-time codes for amplify-and-forward relaying networks 扩和转发中继网络的分布式空时码
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6952314
M. O. E. Astal, B. P. Salmon, J. Olivier
Most research on Distributed Space-Time Block Coding focus on utilizing 2 relaying nodes that are assumed to be permanently available. In the case where higher diversity order is available for utilization, maintaining full-rate become troublesome or the complexity of decoding will be increased significantly. In this paper a distributed full-rate encoding scheme is proposed that will achieve any order of diversity, while maintaining lower complexity. The idea is to adapt an existing code, which is based on a low complexity approach used in conventional Multiple Input Multiple Output systems, to work on an amplify-and-forward relaying network. This will ensure the ability of the system to scale with ease by accommodating any number of relays with minimal overhead. In addition, the method does not require any control-information overhead for the codegeneration coordination process among relay nodes. Simulation results show the effectiveness of this code which retains its full-diversity, full-rate and linear decoding complexity.
大多数关于分布式空时分组编码的研究都集中在利用假定永久可用的2个中继节点。在可利用的分集顺序较高的情况下,保持全码率变得困难,或者解码的复杂性将大大增加。本文提出了一种分布式全速率编码方案,可以实现任意阶的分集,同时保持较低的复杂度。这个想法是改编现有的基于传统多输入多输出系统中使用的低复杂度方法的代码,以在放大和转发中继网络上工作。这将确保系统能够以最小的开销容纳任意数量的继电器,从而轻松扩展。此外,该方法不需要中继节点间编码协调过程的任何控制信息开销。仿真结果表明,该码在保持全分集、全码率和线性译码复杂度的前提下是有效的。
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引用次数: 0
Performance of maximum-largest weighted delay first algorithm in long term evolution-advanced with carrier aggregation 基于载波聚合的最大加权延迟优先算法的长期进化性能
Pub Date : 2014-11-20 DOI: 10.1109/WCNC.2014.6952397
H. Ramli
Guaranteed Bit Rate (GBR) applications with strict Quality of Service (QoS) are getting increasingly popular among mobile cellular users. These delay-sensitive applications demand for a large bandwidth for transmission over the mobile cellular systems. Long Term Evolution-Advanced (LTE-A) that supports a wider transmission bandwidth is expected to meet this crucial demand. Packet scheduling is one of the key features as the LTE-A delivers these applications using packet-switching technology. To optimize packet scheduling performance for supporting the GBR applications, this paper adapts a well-known single-carrier Maximum-Largest Weighted Delay First (M-LWDF) algorithm into the multi-carrier downlink LTE-A. Simulation results have demonstrated that the adapted M-LWDF algorithm that performs packet scheduling on each radio resource, takes packet delay and the aggregated average throughput across all component carriers into consideration is more efficient for supporting the delay-sensitive GBR applications in the downlink LTE-A.
具有严格服务质量(QoS)的保证比特率(GBR)应用越来越受到移动蜂窝用户的欢迎。这些对延迟敏感的应用需要在移动蜂窝系统上传输大带宽。支持更宽传输带宽的LTE-A有望满足这一关键需求。分组调度是LTE-A使用分组交换技术交付这些应用程序的关键特性之一。为了优化支持GBR应用的分组调度性能,本文将著名的单载波最大加权延迟优先(M-LWDF)算法应用于多载波下行LTE-A。仿真结果表明,改进的M-LWDF算法在每个无线电资源上执行分组调度,考虑了分组延迟和所有分量载波的总平均吞吐量,可以更有效地支持下行链路LTE-A中对延迟敏感的GBR应用。
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引用次数: 12
Cell sectorization and power management for inter-cell interference coordination in OFDMA-based network MIMO systems 基于ofdma的网络MIMO系统中小区间干扰协调的小区划分和电源管理
Pub Date : 2014-04-06 DOI: 10.1109/WCNC.2014.6952475
Jeng-Shin Sheu, Sin-Hong Lyu, Song-Jhe Lyu
Network multiple-input multiple-output (MIMO) aims at mitigating the inter-cell interference and improve the performance of cell-edge users (CEUs) through multi-cell cooperative transmissions. This paper investigates the cell sectorization and power management on top of fractional frequency reuse (FFR) based network MIMO systems. It is shown that both the signal strength and interference quantity greatly depend on the layout of cell sectorization. Specifically, a commonly used one is shown to be inappropriate. It is found that there exists a method of sectorization that causes less interference to cell-center users (CCUs) and meantime offers better signal quality to CEU during network MIMO transmissions. Also, results show that the proposed method of managing power can improve the signal quality of other cells CEUs and not degrade the performance of intra-cell users at the same time.
网络多输入多输出(MIMO)技术的目的是通过多小区的协同传输,减轻小区间的干扰,提高小区边缘用户(ceu)的性能。本文研究了基于分数频率复用(FFR)的网络MIMO系统的小区划分和功率管理。研究表明,信号强度和干扰量在很大程度上取决于小区分区的布局。具体来说,一个常用的词被证明是不合适的。研究发现,在网络MIMO传输过程中,存在一种对小区中心用户(ccu)干扰较小,同时又能提供较好信号质量的分界方法。结果表明,所提出的功率管理方法在提高其他小区ceu信号质量的同时,不会降低小区内用户的性能。
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引用次数: 6
Incentive mechanism for participatory sensing under budget constraints 预算约束下参与式感知的激励机制
Pub Date : 2014-04-06 DOI: 10.1109/WCNC.2014.6953116
Zheng Song, E. Ngai, Jian Ma, Xiangyang Gong, Yazhi Liu, Wendong Wang
Incentive strategy is important in participatory sensing, especially when the budget is limited, to decide how much and where the samples should be collected. Current auction-based incentive strategies purchase sensing data with lowest price requirements to maximize the amount of samples. However, such methods may lead to inaccurate sensing result after data interpolation, particularly for participants that are massing in certain subregions where the low-price sensing data are usually aggregated. In this paper, we introduce weighted entropy as a quantitative metric to evaluate the distribution of samples and find that the distribution of data samples is another important factor to the accuracy of sensing result. We further propose a greedy-based incentive strategy which considers both the amount and distribution of samples in data collection. Simulations with real datasets confirmed the impact of samples distribution to data accuracy and demonstrated the efficacy of our proposed incentive strategy.
激励策略在参与式感知中是重要的,特别是在预算有限的情况下,决定应该收集多少样本和在哪里收集样本。当前基于拍卖的激励策略以最低的价格要求购买传感数据,以最大化样品数量。然而,这种方法可能导致数据插值后的传感结果不准确,特别是对于聚集在通常聚集低价格传感数据的某些次区域的参与者。本文引入加权熵作为定量度量来评价样本的分布,发现数据样本的分布是影响传感结果准确性的另一个重要因素。我们进一步提出了一种基于贪婪的激励策略,该策略同时考虑了数据收集中样本的数量和分布。用真实数据集进行的模拟证实了样本分布对数据准确性的影响,并证明了我们提出的激励策略的有效性。
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引用次数: 11
On scheduling algorithm for device-to-device communication in 60 GHz networks 60 GHz网络中设备间通信调度算法研究
Pub Date : 2014-04-06 DOI: 10.1109/WCNC.2014.6952777
W. Rehman, Jiang Han, Chengcheng Yang, Manzoor Ahmed, Xiaofeng Tao
The world is witnessing a tremendous increase in data demands which is subject to the new emerging technologies, applications and services. 60 GHz communication network is one of such technology, claiming data rate in multi-gigabits. In this paper, we propose a scheduling algorithm for device-to-device 60 GHz network having directional antennas. The proposed algorithm utilizes the vertex coloring scheme and is optimized to improve system throughput. A threshold minimum distance between conflicting flows is used to keep the accumulative interference limited. Also, when there are conflicts among different flows, those with better data rate prospects will be scheduled priorly. Simulation results show that our scheme has brought significant improvement to system throughput almost by 19% and average flow number per slot is improved by 12%, as compared to other scheduling algorithms.
受新兴技术、应用和服务的影响,世界对数据的需求正在急剧增加。60千兆赫通信网络就是这样一种技术,要求数据速率达到千兆位。本文提出了一种具有定向天线的设备对设备60ghz网络的调度算法。该算法利用顶点着色方案,并进行了优化,以提高系统吞吐量。冲突流之间的最小距离阈值用于限制累积干扰。此外,当不同流之间存在冲突时,数据速率前景较好的流将被优先调度。仿真结果表明,与其他调度算法相比,该方案使系统吞吐量提高了近19%,每个时隙的平均流数提高了12%。
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引用次数: 19
Novel MGF-based expressions for the average bit error probability of binary signalling over generalized fading channels 基于mgf的广义衰落信道二进制信号平均误码概率新表达式
Pub Date : 2014-04-06 DOI: 10.1109/WCNC.2014.6952286
F. Yilmaz, Mohamed-Slim Alouini
The main idea in the moment generating function (MGF) approach is to alternatively express the conditional bit error probability (BEP) in a desired exponential form so that possibly multi-fold performance averaging is readily converted into a computationally efficient single-fold averaging - sometimes into a closed-form - by means of using the MGF of the signal-to-noise ratio. However, as presented in [1] and specifically indicated in [2] and also to the best of our knowledge, there does not exist an MGF-based approach in the literature to represent Wojnar's generic BEP expression in a desired exponential form. This paper presents novel MGF-based expressions for calculating the average BEP of binary signalling over generalized fading channels, specifically by expressing Wojnar's generic BEP expression in a desirable exponential form. We also propose MGF-based expressions to explore the amount of dispersion in the BEP for binary signalling over generalized fading channels.
矩生成函数(MGF)方法的主要思想是以期望的指数形式交替地表示条件误码概率(BEP),以便通过使用信噪比的MGF很容易地将可能的多倍性能平均转换为计算效率高的单倍平均-有时转换为封闭形式。然而,正如[1]和[2]中所提出的,以及据我们所知,在文献中还没有一种基于mgf的方法来以期望的指数形式表示Wojnar的通用BEP表达。本文提出了一种新的基于mgf的计算广义衰落信道上二进制信号平均BEP的表达式,特别是将Wojnar的通用BEP表达式表示为理想的指数形式。我们还提出了基于mgf的表达式来探索广义衰落信道上二进制信号的BEP中的色散量。
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引用次数: 2
期刊
2014 IEEE Wireless Communications and Networking Conference (WCNC)
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