本期目录

2010年 17卷 2期 刊出日期：2010-04-30



Wireless

SNR-based Weighted Cooperative Spectrum Sensing in Cognitive Radio Networks

吴素文 邱玲 赵明 朱近康

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60437-4

摘要 ( 2236 )

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Cooperative spectrum sensing (CSS) is an approach to confront fading environment. However, in conventional cooperative spectrum sensing, the difference among the secondary users (SUs) is ignored when SUs suffer from different fading. In this paper, we propose a Signal-to-Noise Ratio (SNR)-based weighted spectrum sensing scheme to improve the sensing performance. Then the sensing performance of the weighted spectrum sensing scheme is firstly derived which previous work never related. Considering the minor contribution of the SUs with small weighted factor, we propose a selective cooperative spectrum sensing scheme where the SUs with low SNR are not selected into cooperative spectrum sensing. The simulation results confirm the analytical results. And the performance of weighted scheme is better than that of conventional schemes. In the case that the SNR of SUs are random distributed, the performance of selective scheme is almost the same as the weighted scheme while the number of cooperative SUs is reduced to save the consumption of system resource in cooperation with little additional complexity.

On the bounds of frequency-selective channel capacity with doubly correlated geometrical MIMO channel model

李永华 吕铁军 吴晓非 张琳

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60438-6

摘要 ( 2246 )

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As is well known, the MIMO technology plays an important role for the link transmissions. This paper considers the general case for the ergodic capacity in doubly correlated frequency-selective MIMO channel. In the study, the geometrical MIMO channel model is presented. Based on the formula of MIMO ergodic capacity, the capacity limits are investigated with arbitrary finite number of antennas in the frequency-selective MIMO channel. It first derives the exact expressions for the upper bound and lower bound in doubly correlated MIMO channel. The results for the single-ended correlation and independent identically distributed (i.i.d.) MIMO channel are also obtained as special cases. Then the simple expressions of the capacity bounds are attained at high SNR. Finally, some results are provided by Monte Carlo simulations to verify the tightness of the derived bounds.

System Utility Based Resource Allocation for Multi-cell OFDM System

郝志洁 许晓东 李林军 陶小峰 赵英宏 张忠起

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60439-8

摘要 ( 2069 )

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Utility based resource allocation strategy in multi-cell orthogonal frequency-division multiplexing (OFDM) system is vital in next generation mobile communication system. Based on the analysis of risk aversion utility functions, this paper proposed the system utility based utility, which is named the Customer Satisfaction (CS) utility. Compared with the Proportional Fairness (PF) utility, the CS utility reflects the user demands better, and enables the system to adjust its resource allocation according to both the traffic requirements and the resource situation.

Multi-user diversity analysis in MISO amplify-and-forward relaying network

刘芳 陈少华 梁慜 杨大成 张欣

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60440-4

摘要 ( 1996 )

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This paper analyzed multi-user diversity performance for multiple input single output (MISO) amplify-and-forward (AF) relaying network with selection combiner, and the closed-form outage probabilities for variable gain relaying and fixed gain relaying network are derived. Based on these results, diversity order is presented for variable gain relaying network. Simulation results validate the derived theoretical results, and the diversity order of variable gain relaying network with available relays is in users’ scenario (where is the number of source transmitter antennas).

Coded overlapped code division multiplexing system with turbo product structure

周素华 方莉 李道本

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60441-6

摘要 ( 2144 )

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Coded Overlapped Code Division Multiplexing System with Turbo Product structure (TPC--OVCDM) is introduced, and Trellis coded modulation (TCM) code is employed as error correcting code for uncoded OVCDM system. In such a scheme, row code and column code are TCM and OVCDM spreading code respectively. Data bits are only encoded directly by TCM and transform them into a matrix, each column of this matrix is then permuted by symbol interleaver before being encoded by OVCDM spreading code. During iterative decoding process in the receiver, two constituent decoders use symbol by symbol BCJR algorithm in the log domain. Decoding order of two sub codes can not be exchanged in arbitrary order and depend on the encoding order. Proportion between TCM coding and OVCDM coding is an important factor to affect system performance. For fixed coding structure and symbol interleaver, performance of TPC-OVCDM systems with different proportion on additive white Gaussian noise (AWGN) channel have been simulated. Simulation results show that TPC-OVCDM system with reasonable proportion can achieve significant coding gain compared with uncoded OVCDM system under the condition of same spectral efficiency at bit error rate level of 10-5.

Joint Selection of Adaptive Relaying Mode in Cooperative Transmission

王朝炜 李立华 王海峰 邬刚

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60442-8

摘要 ( 2204 )

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Relay is a promising technology in wireless communications. There are several relaying modes for different channel conditions. In this paper, an adaptive relaying mode selection scheme jointly by destination and relay is proposed. The proposed scheme alters the signal forwarding mode at the relay station. It adaptively chooses among Amplify-and-Forward, Decode-and-Forward and direct mode according to Cyclic Redundancy Check (CRC) detection at relay and destination. Moreover, Block Error Rate (BLER) and throughput are adopted to evaluate system performance. The simulation results demonstrate that the proposed scheme significantly outperforms other existing relaying mode selection schemes.

Phase noise sensitivity analysis of lattice constellation

于光炜 贺志强 林家儒 牛凯 王绪振

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60443-X

摘要 ( 2054 )

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Error Performance of Distributed Turbo Coded Relay Systems Over Quasi-Static Rayleigh Fading Channels

彭岳星

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60444-1

摘要 ( 2105 )

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A Novel Algorithm for Cooperative Automatic Modulation Recognition in Cognitive Radio

陈美 朱琦

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60445-3

摘要 ( 2100 )

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Bandwidth Allocation and Admission Control Scheme Based on Nash Bargaining Solution for WiMAX Systems

蔡道进 纪红

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60446-5

摘要 ( 3151 )

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本文利用纳什议价方法，提出一种WiMax系统中时分多址(TDMA)模式下的带宽分配和接入控制策略。该策略从合作博弈论的角度在WiMax系统的各种业务流之间分配带宽。根据用户分配带宽的结果，计算系统的吞吐量，衡量网络的收益。另外，提出一种接入控制策略用来实现系统收益的最大化。仿真结果表明，在不同的业务连接数和可变的信道质量情况下，带宽分配算法都能公平高效的为用户分配带宽，保障系统收益。接入控制策略能自适应于信道质量的变化。

A Robust Tomlinsion-Harashima Precoding Design with Outdated CSIT

王绪振 贺志强 牛凯 吴伟陵 于光炜

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60447-7

摘要 ( 2207 )

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发射端信道状态信息(CSIT)的获取对多输入多输出系统的有重要的影响，尤其是预编码机制。但是，在实际系统中很难得到完全的发射端信道状态信息。本文采用了一种有效并且具有实际意义的动态发射端信道状态信息获取模型来获取不完全的发射端信道信息。为了切合实际，本模型考虑了信道的时间和空间相关性。根据相关性，利用过时的信道信息来对当前信道进行估计，并得到估计误差方差。基于动态CSIT模型估计得到的信道信息，通过拉格朗日乘数法推导出闭式的THP预编码器。仿真证明本文提出方法具有很好性能。

Performance analysis of rake-MBER-equalizer for DS-UWB communication systems

wangbinhao

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60448-9

摘要 ( 1895 )

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Modeling And Simulation Of Pin-hole Channels

魏明东 张业荣

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60449-0

摘要 ( 2109 )

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Closed-Form Expressions for Outage Probability of Decode-and-Forward Relaying Over Nakagami-m Fading Channels

啜钢 胡杨 刘圣 李秀欣

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60449-0

摘要 ( 1994 )

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Networks

Scheduling Piece Requests Blindly and Randomly for Peer-to-Peer Live Streaming

陈一帅 陈常嘉 李纯喜 赵永祥

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60451-9

摘要 ( 2488 )

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The design of piece scheduling algorithm is fundamental in mesh-based Peer-to-Peer (P2P) live streaming systems. This paper regards the piece propagation process in P2P live streaming system as a conflict process, where peers compete to get the piece as soon as possible to meet the tight timing requirement of the live system. In this vision, we reduce the piece scheduling problem as a conflict resolution problem, and propose a blind random scheduling method to resolve it. The algorithm is: 1) pieces are scheduled independently; 2) conflicts are resolved by the random back off algorithm. The theoretical analysis and simulation results prove that the algorithm scales well with the network size, and can obtain near-optimal in-time delivery of pieces. The algorithm is also easy to implement in the real-world system.

Relaying Strategy for Peer-to-Peer Content Distribution Based On Genetic Algorithm

何倩 陈俊亮 孟祥武 商彦磊

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60452-0

摘要 ( 2099 )

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This article proposes a cooperative relaying strategy to make efficient use of the relaying resources of Internet Service Providers (ISPs), speedup distribution and save server bandwidth costs. ISPs cooperatively relay for each other, and peers assist to distribute and fetch the content as near as possible. Base on fluid model, a constrained model is derived to get optimized global distribution performance in the channel-based system with limited relaying resources. The multi-objectives of the model are minimizing the average distribution time and the distribution time of the slowest channel. Genetic Algorithm (GA) is designed to solve the optimization problem. The relaying strategy based on GA can be run periodically to update the allocation policy of ISPs. The relaying strategy’s distribution performance is analyzed in the experiments and results show that GA can give proper solutions for various network topologies.

Load Balancing Routing Protocol for single-layered Satellite Networks

王汝传

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60453-2

摘要 ( 2168 )

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要在卫星网络中进行信息交换，首先需要解决路由问题。由于人口分布不均匀，全球卫星用户群分布差异较大。用户群分布差异导致了一些卫星节点和星际链路十分空闲，而另一些则严重过载。为实现全卫星网的流量工程，提出了一种新型的应用于单层卫星网的基于移动代理的负载平衡路由协议LBRP-MA（Load Balancing Routing Protocol based on Mobile Agent）。通过在类Courier星座中的仿真表明LBRP-MA协议能够实现有保证的端到端时延、低丢包率和高吞吐量。LBRP-MA协议特别适合于单层卫星网重负载情况下的数据传输。

Artificial Intelligence

Effective Generalized Equations of Secure Hyperelliptic Curve Digital Signature Algorithms

游林 桑永宣

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60454-4

摘要 ( 2146 )

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A hyperelliptic curve digital signature algorithm (HECDSA) can be viewed as the hyperelliptic curve analogue of the standard digital signature algorithm (DSA). This paper discusses divisor evaluations, describes the basic HECDSA, some variants, two HECDSA equations and a 4-tuple HECDSA scheme, and puts forward a generalized equation for HECDSA. From this generalized equation, seven general HECDSA types are derived based on the efficiency requirements. At the same time, the securities of these general HECDSA types are analyzed in detail.

Reconfigurable Design and Implementation of the MD6 Hash Function

高献伟

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60455-6

摘要 ( 2312 )

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Efficient reconfigurable FPGA architectures for the MD6-224/256/384/512 hash algorithm are proposed in this work. The basic iterative compact design requires 923 ALMs, achieves a throughput ranges from 225 to 394 Mbps at the maximum frequency of 198MHz; the 32-step-unrolled high-throughput design requires 7 090 ALMs, achieves a throughput ranges from 5 776 to 9 490 Mbps at the maximum frequency of 173MHz. The implementation results show that high flexibility and efficient FPGA implementation of the MD6 hash function is achieved.

Topology-assisted deterministic packet marking for IP traceback

王小静 王潇茵 姚淑萍

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60456-8

摘要 ( 2135 )

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针对防御（分布式）拒绝服务攻击，提出一种新的用于IP追踪的确定包标记方案。该方案具有很好的可扩展性和高准确性。每个入口路由器预先计算它IP地址的哈希值，并将之拆成若干段，路由器随机选择其中一个段标记包。在追踪阶段，受害者接收到仅仅若干个标记包后，借助于上游路由器的拓扑图，受害者就可以识别可疑的入口路由器。在大规模分布式拒绝服务攻击下，还原一个路由器时，已有确定包标记方法需要几十个包且误报率高，而该方案克服了这些缺点。给出了理论分析，伪代码和实验结果，证明TDPM在应对大规模DDoS攻击是准确有效的

Others

ene Expression Programming for Attribution Reduction in Rough Set on Grid Environment

邓松 付雄 王汝传

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60457-X

摘要 ( 2032 )

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本文提出基于基因表达式编程的粗糙集属性约简算法(GEP-ARRS)，并针对属性约简的特点，设计了新的GEP编码形式，它可以很好地把属性约简问题编码成GEP能处理的表达树，同时设计了反映属性约简的新适应度函数。为了更快地求解出最优约简，GEP-ARRS算法利用动态种群生成策略，不断缩小GEP基因长度，加快GEP算法的求解速度。比较实验表明，无论对于大数据集或者高维数据集而言，GEP-ARRS算法比传统的基于智能计算的属性约简算法在求解属性约简的速度和质量上都有着明显的优势。

Study on the temperature characteristics of the phase measurement in homodyne fiber interferometer

高博 罗红娥 汝玉星 田小建 王晴 吴戈

中国邮电高校学报(英文), 2010, 17 (2). doi： 10.1016/S1005-8885(09)60458-1

摘要 ( 1949 )

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利用恒温控制平台，通过测量干涉光电流和干涉仪两臂光电流的方法，实现了对全光纤干涉仪两臂初相位差的测量。由于光纤对温度的敏感性，研究零差光纤干涉仪相位测量的温度特性是必要的。由实验数据分析可知，零差光纤干涉仪两臂相位差的变化量和温度变化量成线性关系，这与理论分析结果是一致的。在以往的文献中，还没有关于此方面的定量研究。