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2011 National Conference on Communications (NCC)最新文献

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Proportionally fair resource allocation in multi-rate WLANs 在多速率无线局域网中按比例公平分配资源
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734707
J. Champati, P. Chaporkar
Since IEEE has standardized 802.11 protocol for WLANs, significant work has been done in developing rate adaptation algorithms. Most of the rate adaptation algorithms proposed till now are heuristic, suboptimal and are competitive in nature. Even though these algorithms have advantage of implementing in distributed fashion, their throughput performance will be low as these schemes may converge to inefficient Nash equilibrium [1]. On the other hand users may cooperatively choose their rates so that a social optimum can be achieved, but there are no known algorithms that do rate adaptation cooperatively and still be implemented in a distributed fashion. In this paper, we aim at designing a distributed algorithm that achieves a social optimum (by doing rate adaptation cooperatively) while guaranteeing proportional fairness. We also propose an efficient centralized algorithm which serves the same purpose as the distributed algorithm.
由于IEEE已经为无线局域网标准化了802.11协议,因此在开发速率自适应算法方面已经做了大量工作。目前提出的大多数速率自适应算法都是启发式的、次优的和竞争性的。尽管这些算法具有以分布式方式实现的优势,但它们的吞吐量性能会很低,因为这些方案可能会收敛到低效的纳什均衡[1]。另一方面,用户可能会合作选择他们的费率,以便实现社会最优,但目前还没有已知的算法可以合作调整费率,并且仍然以分布式方式实现。在本文中,我们旨在设计一种分布式算法,在保证比例公平的同时实现社会最优(通过协同进行速率自适应)。我们还提出了一种高效的集中式算法,其目的与分布式算法相同。
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引用次数: 2
Partitioning the wireless environment for determining radio coverage and traffic distribution with user feedback 划分无线环境,根据用户反馈确定无线电覆盖范围和流量分布
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734731
Kejiong Li, P. Jiang, J. Bigham
To achieve high data rates and seamless coverage, radio access networks continue to increase in complexity, and the expenditure on operational tasks continues to rise to unprecedented levels. The development of Long Term Evolution (LTE) with Self-organizing network (SON) functions is being considered as an effective way to tackle these challenges. The paper describes an approach to model the coverage areas so that resource allocation algorithms can benefit from traffic distribution and coverage information. The main problem considered in this paper is the partitioning of the wireless environment into regions that allow for accurate modelling of the propagation environment and prediction of the traffic distribution. The analysis is based on models constructed from historical data and monitoring of the received signal strengths from the mobile stations (MSs). The mechanism is based on the similarity of perceived signals from MSs. The performance is evaluated using data generated from a network planning tool for a real environment.
为了实现高数据速率和无缝覆盖,无线接入网的复杂性不断增加,业务任务的支出继续上升到前所未有的水平。开发具有自组织网络(SON)功能的长期演进(LTE)被认为是应对这些挑战的有效途径。本文描述了一种覆盖区域建模方法,使资源分配算法能够从交通分布和覆盖信息中获益。本文考虑的主要问题是将无线环境划分为区域,以便对传播环境进行准确建模并预测流量分布。分析是基于历史数据和从移动站(MSs)接收到的信号强度监测建立的模型。该机制是基于从MSs感知信号的相似性。使用真实环境的网络规划工具生成的数据来评估性能。
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引用次数: 8
Prediction of SINR improvement with a directional antenna or antenna array in a cellular system 蜂窝系统中定向天线或天线阵列的信噪比改善预测
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734716
K. Karthik, B. Ramamurthi
We consider a reuse-1 cellular system and study the improvement in SINR possible for a fixed/nomadic receiver, from the use of an optimally oriented directional patch antenna or a Uniform Linear Array (ULA) with 2 or 4 antenna elements along with Minimum Mean Square Error (MMSE) combining. We perform the studies with a ray-tracing propagation model as well as an empirical statistical model that is based on measurement values, in an urban macro scenario. The results show that a mean improvement of around 5 dB in SINR is possible using either the directional antenna or a 2-antenna ULA. In contrast, a 4-antenna ULA gives a mean improvement of around 11 dB. Interestingly, the results are similar with both channel models.
我们考虑了一个重用-1蜂窝系统,并研究了固定/游牧接收机的信噪比可能的改善,通过使用最佳定向定向贴片天线或具有2或4个天线单元的均匀线性阵列(ULA)以及最小均方误差(MMSE)组合。我们在城市宏观场景中使用光线追踪传播模型以及基于测量值的经验统计模型进行研究。结果表明,使用定向天线或双天线ULA可以平均提高约5 dB的信噪比。相比之下,4天线ULA的平均改进约为11 dB。有趣的是,两种渠道模型的结果是相似的。
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引用次数: 3
Possible realization of near optimum efficiency from n-Si-Ge/p-Ge-Si DDR Hetero Structure IMPATT Diode 利用n-Si-Ge/p-Ge-Si DDR异质结构impt二极管实现接近最佳效率的可能性
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734708
P. R. Tripathy, M. Mukherjee, S. P. Pati
A p-n junction under reverse bias avalanche breakdown condition is capable of producing high frequency rf power in Impatt mode. With the advancement of Device Technology, the present state of art reports realization of alloy Si-Ge junction, Si-Ge hetero junction. Introduction of a n-Ge and p-Ge impurity bumps near the junction face on respective side of Si p-n junction leaves an asymmetrical hetero structure junction which has become the scope of study of this paper for operation at 15 and 96 GHz. Three tier sophisticated computer algorithm has been framed and used for Impatt analysis of resulting n-Si-Ge/p-Ge-Si Hetero Structure reveals realization of device efficiency as high as 29.6% (Theoretical Optimum Efficiency of Impatt Diode=31%) and also high value of negative conductance. Presence of Ge layer near junction and an order high carrier ionization rate in Ge compared to Si localizes the avalanche zone, which pushes the efficiency and RF power generation. Similar results are also noticed for 96 GHz operations. The performance from this structure is observed to be superior by considerable extent as compared to Si and Ge homo structure. However the complementary hetero structure having the form n-Ge-Si/p-Si-Ge is observed to exhibit performance almost on par to Si and Ge homo structures. The results are highly encouraging which may make Si-Ge Hetero Structure Diode as a microwave generator.
在反向偏置雪崩击穿条件下的pn结能够在冲击模式下产生高频射频功率。随着器件技术的进步,目前的技术水平报道了合金硅锗结、硅锗异质结的实现。在Si p-n结两侧的结面附近引入n-Ge和p-Ge杂质凸起,形成不对称异质结构结,成为本文在15和96 GHz工作的研究范围。构建了三层复杂的计算机算法,并对所得的n-Si-Ge/p-Ge-Si异质结构进行了impat分析,结果表明器件效率高达29.6% (impat二极管的理论最佳效率=31%),负电导值也很高。结附近Ge层的存在以及Ge中载流子电离率比Si高一个数量级,使雪崩区局部化,从而提高了效率和射频功率的产生。在96 GHz操作中也注意到类似的结果。这种结构的性能在相当程度上优于硅和锗同质结构。然而,具有n-Ge-Si/p-Si-Ge形式的互补异质结构表现出几乎与Si和Ge同质结构相当的性能。研究结果为硅锗异质结构二极管用作微波发生器提供了理论依据。
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引用次数: 9
MAP estimation of CFO and STO for a convolutionally coded OFDM system 卷积编码OFDM系统CFO和STO的MAP估计
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734748
A. Neogi, A. Mitra
We propose a maximum a-posteriori (MAP) based blind algorithm for carrier frequency offset (CFO) and symbol timing offset (STO) estimation, for a convolutionally coded orthogonal frequency division multiplexing (COFDM) system, in an additive white Gaussian noise (AWGN) channel. We derive the MAP estimators mathematically. It is observed that though the MAP metric for CFO estimation gives a good performance for an AWGN channel, the MAP metric for STO estimation is unable to provide satisfactory performance.
针对加性高斯白噪声(AWGN)信道中的卷积编码正交频分复用(COFDM)系统,提出了一种基于MAP的载波频偏(CFO)和符号时序偏(STO)盲估计算法。我们从数学上推导了MAP估计量。我们观察到,尽管用于CFO估计的MAP度量对AWGN信道给出了良好的性能,但用于STO估计的MAP度量无法提供令人满意的性能。
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引用次数: 3
Azimuth-dependent spatialization for a teleconference audio display 用于电话会议音频显示的方位相关空间化
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734758
N. Harikrishnan Potty, D. Sengupta, R. Velmurugan, P. Rao
This paper proposes a novel scheme for the spatial rendition of audio in a teleconferencing situation. Several researchers have examined and established that there is a substantial improvement in intelligibility by the use of spatialization in such a multitalker environment, over monaural rendition. We provide experimentally obtained values for the Minimum Audible Angle (MAA) that provides release from masking in a speech over speech masking scenario. The results clearly indicate that the MAA varies with the azimuth. This dependency on azimuth has been utilized to improve the intelligibility of speech in a given teleconference within a limited auditory space. The advantage of such a scheme over simple auditory space division is demonstrated by another set of perceptual experiments.
本文提出了一种用于远程会议环境下音频空间再现的新方案。几位研究人员已经检查并确定,在这样的多语环境中,通过使用空间化,可以大大提高可理解性,而不是单声再现。我们提供了实验获得的最小可听角(MAA)值,该值可以在语音屏蔽场景中提供屏蔽释放。结果清楚地表明MAA随方位角的变化而变化。这种对方位的依赖已被用于在有限的听觉空间内的给定电话会议中提高语音的可理解性。另一组知觉实验证明了这种方案优于简单的听觉空间划分。
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引用次数: 1
Exact error analysis for the piecewise linear combiner for decode and forward cooperation with two relays 分段线性组合器与两个继电器译码和转发配合的精确误差分析
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734694
A. Jain, G. Sharma, S. Merchant, U. Desai
Exact expressions are obtained for the bit error rate (BER) for coherent and noncoherent decode and forward (DF) cooperative systems with two relays. The piecewise linear (PL) combiner, a close approximation to the maximum likelihood (ML) detector, is employed at the receiver. BER analysis is done using a contour integral approach for evaluating the Gil-Pelaez integral involving the characteristic function (CF) of the decision variable. Previous attempts relied on a direct approach, that imposed restrictions on the location of the relays. In this paper, this restriction has now been removed. Through simulation results, we verify the validity of the derived analytical expressions.
得到了具有两个中继的相干和非相干译码转发(DF)合作系统的误码率的精确表达式。在接收端采用分段线性(PL)组合器,近似于最大似然(ML)检测器。BER分析使用轮廓积分方法来评估涉及决策变量的特征函数(CF)的Gil-Pelaez积分。以前的尝试依赖于直接的方法,这对继电器的位置施加了限制。在本文中,这一限制现在已被删除。通过仿真结果验证了推导出的解析表达式的有效性。
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引用次数: 3
Impact of interference on nodal communication range in wireless ad hoc networks 干扰对无线自组网中节点通信范围的影响
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734752
Ashwani Sharma, B. Panigrahi, S. De
In a distributed control wireless ad hoc network, multi-user interference plays a significant role in determining one-to-one communication throughput performance of the network. Although the effects of exposed/hidden terminals on the network throughput in a single-channel wireless ad hoc network have been extensively studied, the interference power computation at the receiver and its effect on the acceptable communication range has not been analyzed in the literature. In this paper, via probabilistic analysis we capture the total interference power that a receiver node experiences. We then demonstrate the impact of interference power on the effective communication range of the nodes. Our analytic results are validated by C-based network simulation. The observations in this paper can be used in deciding interference-aware multi-hop forwarding strategies in wireless ad hoc networks.
在分布式控制无线自组织网络中,多用户干扰对网络的一对一通信吞吐量性能起着重要作用。虽然在单通道无线自组织网络中,暴露/隐藏终端对网络吞吐量的影响已经得到了广泛的研究,但是在接收端的干扰功率计算及其对可接受通信范围的影响尚未得到文献的分析。在本文中,我们通过概率分析获得了接收节点所经历的总干扰功率。然后,我们演示了干扰功率对节点有效通信范围的影响。基于c语言的网络仿真验证了分析结果。本文的观察结果可用于确定无线自组织网络中干扰感知的多跳转发策略。
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引用次数: 4
Comprehensive Learning Particle Swarm Optimization based TSK structure identification and its application in OFDM receiver for nonlinear channel equalization 基于综合学习粒子群算法的TSK结构识别及其在OFDM接收机非线性信道均衡中的应用
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734745
Seemanti Saha, S. S. Pathak, S. Chakrabarti
This paper presents a first order Takagi-Sugeno-Kang (TSK) type fuzzy equalizer to mitigate nonlinear power amplifier distortion effects from the received signal in orthogonal frequency division multiplexing (OFDM) systems. Here we propose a Comprehensive Learning Particle Swarm Optimizer (CLPSO) [1] based structure identification of the TSK equalizer. CLPSO uses a new learning strategy that achieves the goal to accelerate the convergence of the classical particle swarm optimization (PSO) to the global optimal values. Unlike gradient based techniques CLPSO has the capability to escape from the traps of local optima while obtaining the values of nonlinear premise parameters of TSK equalizer. In this work, proposed equalization technique reduces the adverse nonlinear distortion effects at receiver in a Rayleigh faded OFDM communication system and a significant improvement in bit error rate (BER) performance is achieved. Computer Simulations show improved bit error rate (BER) and mean square error (MSE) performances of this novel PSO based TSK equalization in OFDM receiver compared to the latest power amplifier nonlinearity cancellation (PANC) technique [2].
提出了一种一阶Takagi-Sugeno-Kang (TSK)型模糊均衡器,用于减轻正交频分复用(OFDM)系统中接收信号的非线性功率放大器失真效应。本文提出了一种基于综合学习粒子群优化器(CLPSO)[1]的TSK均衡器结构识别方法。CLPSO采用了一种新的学习策略,实现了加速粒子群算法向全局最优收敛的目标。与基于梯度的方法不同,CLPSO在获取TSK均衡器的非线性前提参数值时,能够摆脱局部最优的陷阱。本文提出的均衡技术减少了瑞利衰落OFDM通信系统中接收端非线性失真的不利影响,显著提高了误码率(BER)性能。计算机仿真表明,与最新的功率放大器非线性抵消(PANC)技术相比,这种基于PSO的新型OFDM接收机TSK均衡技术提高了误码率(BER)和均方误差(MSE)性能[2]。
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引用次数: 2
A 6 mW low noise amplifier for 3.1–10.6 GHz UWB application 用于3.1-10.6 GHz超宽带应用的6mw低噪声放大器
Pub Date : 2011-03-17 DOI: 10.1109/NCC.2011.5734714
Varish Diddi, K. V. Srivastava, A. Biswas
This paper presents a single stage low-noise amplifier (LNA) using cascode topology for low-power UWB applications. Resistive feedback is used to obtain large bandwidth. The LNA achieves peak gain of 11.8 dB and noise figure varying from1.72 – 3.62 dB within the band of 3.1 – 10.6 GHz. The LNA uses supply of 2 V while consuming only 6 mW of dc power. The technology used for design is 0.25 µm IHP SiGe BiCMOS which employs Heterojunction Bipolar Transistor (HBT). The output 1 dB compression point and input IP3 for LNA are −23 dBm and −12.48 dBm respectively.
本文提出了一种基于级联码拓扑的单级低噪声放大器(LNA)。电阻反馈用于获得大带宽。在3.1 ~ 10.6 GHz频段内,LNA的峰值增益为11.8 dB,噪声系数为1.72 ~ 3.62 dB。LNA使用2v电源,仅消耗6mw直流功率。设计采用0.25µm IHP SiGe BiCMOS技术,采用异质结双极晶体管(HBT)。LNA的输出1db压缩点和输入IP3分别为−23 dBm和−12.48 dBm。
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引用次数: 3
期刊
2011 National Conference on Communications (NCC)
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