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	1. Good Encodable Irregular Quasi-Cyclic LDPC Codes
	Xiao Yang,Kiseon Kim
	Electrics, Communication and Autocontrol Technology 04 February 2009
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	Abstract:The existing encodable irregular LDPC codes may have a degraded BER performance when it is derived from classical regular QC LDPC codes since both girth property and weight property are not carefully given attention to two or more thing. Some codes have large girths but they have small minimum weights which lead to a poor BER performance. To solve the problem, we propose a new approach to construct the encodable irregular QC codes, which can not produce new short girths and can keep the large minimum weight and minimum distance of the codes. The theorems of girth 4 and girth 6 are provided to test the girth variance of the obtained irregular QC codes. Simulations verify the construction of the QC LDPC codes to be valid, since better BER performance than that of existing encodable irregular LDPC codes is obtained.
	TO cite this article:Xiao Yang,Kiseon Kim. Good Encodable Irregular Quasi-Cyclic LDPC Codes[OL].[ 4 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28370


	2. A Seamlessly Positioning Architecture
	Tian Anhong,Fu Cheng-biao,Shao Jian-xing
	Electrics, Communication and Autocontrol Technology 19 January 2009
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	Abstract:This article describes a network of third-party position on a moving target positioning process, and proposes an approach based on TD-SCDMA network architecture seamless positioning program, integrate the existing GPS positioning technology and wireless location network technology, thus realize the ubiquitous mobile location-based services.This network architecture can be a good environment to the different needs of different users with seamless global positioning.
	TO cite this article:Tian Anhong,Fu Cheng-biao,Shao Jian-xing. A Seamlessly Positioning Architecture [OL].[19 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28023

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	3. Stability Test in 2-D s-z Domain for Queue Systems
	Xiao Yang,Kiseon Kim
	Electrics, Communication and Autocontrol Technology 16 January 2009
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	Abstract:Based on 2-D Laplace-z transform, this paper develops a 2-D stability test for queue systems with fixed parameters. In this paper, classical queue systems with fixed parameters are modeled into 2-D continuous-discrete systems with fixed parameters. Then taking 2-D Laplace-z transform for them, we obtain the 2-D s-z domain queue models. Applying the presented Hurwitz-Schur stability theorems, the stability of typical queue systems can be determined in 2-D s-z domain, it is not necessary to find the solutions of queue systems in time-state domain, which is difficult generally. In the 2-D stability analysis of queue systems, this paper reveals that 2-D boundary conditions of queue systems may lead to the problem of second kind nonessential singularities. The hybrid 2-D transform’s definitions and theorems for the stability analysis of queue systems are given in the paper. Examples are given to verify the results of this paper.
	TO cite this article:Xiao Yang,Kiseon Kim. Stability Test in 2-D s-z Domain for Queue Systems[OL].[16 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27988


	4. Simulation on HSUPA System in Network Planning
	Jianhua Liu,Qi Geng,Duo Bao
	Electrics, Communication and Autocontrol Technology 29 December 2008
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	Abstract:As an enhanced WCDMA, HSUPA(High Speed Uplink Packet Access)inherits characteristics such as power control, handover control, etc. In this article, HSUPA system is studied on system level. Through some project cases simulated with given simulation algorithm, effects on cell capacity and performance are remarkable. System-level-simulation of HSUPA constructs a simulation platform which UE (User Equipment) are scattered by given strategy and traffics used are flexibly configured. From the introduction of simulation algorithm and results of simulation case, we can see the simulation platform performs well and provides abundant results to researchers and network engineers. The algorithm will be put across in detail.
	TO cite this article:Jianhua Liu,Qi Geng,Duo Bao. Simulation on HSUPA System in Network Planning[OL].[29 December 2008] http://en.paper.edu.cn/en_releasepaper/content/27052


	5. An Adaptive Bit Loading Algorithm for MIMO-OFDMA Systems with Fixed Rate
	Qing Cui
	Electrics, Communication and Autocontrol Technology 25 December 2008
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	Abstract:This paper considers the optimal resource allocation for MIMO-OFDM systems in multi-user downlink scenario. By using zero-forcing based SDMA scheme, the multi-user MIMO channels are converted to several SISO channels, which facilitate the proposed bit loading algorithm with the objective of minimizing the system bit error rate (BER). We provide the general mathematical formulation of the optimization problem which includes multi-user interference cancellation, multi-user diversity, bits and power allocation. We consider only the case that the total power and rate are defined by a system. Thus, our proposed algorithm can be expressed through a closed form equation, and it has very low complexity comparing with the iterative ones.
	TO cite this article:Qing Cui. An Adaptive Bit Loading Algorithm for MIMO-OFDMA Systems with Fixed Rate[OL].[25 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26930


	6. Comparison of Dispersion Compensation Schemes In 2.5Gb/s OOK Label and 40Gb/s RZ-DPSK Payload Optical Label Switching System based on Optical Carrier Suppression and Separation
	Yan Huang,XiaoMing Hu
	Electrics, Communication and Autocontrol Technology 24 December 2008
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	Abstract:Two dispersion compensation schemes of an optical label switching transmission system were investigated, which deploying 40Gb/s Return Zero Differential Phase-Shift Keying (RZ-DPSK) payload labeled with 2.5Gb/s On-Off Keying (OOK) signal based on the Optical Carrier Suppression and Separation (OCSS) technique. In the Fiber Bragg Gating (FBG) scheme the receiver sensitivity of payload and label achieved -32.2dBm and -25.1dBm, respectively. Using the Fiber Bragg Gating (FBG) scheme, after transmitted over 80km, 160km and 320km fiber respectively, the label can be recovered with less than 1dB power penalty average, while the payload can be recovered with less than 1.5dB penalty average, respectively.
	TO cite this article:Yan Huang,XiaoMing Hu. Comparison of Dispersion Compensation Schemes In 2.5Gb/s OOK Label and 40Gb/s RZ-DPSK Payload Optical Label Switching System based on Optical Carrier Suppression and Separation[OL].[24 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26897


	7. EPON Simulation Platform with Scalability and Flexibility Using the Network Simulator NS-2
	Qi Li
	Electrics, Communication and Autocontrol Technology 18 December 2008
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	Abstract:Ethernet passive optical network (EPON) is believed to be the promising candidate for the next-generation access network, due to its large bandwidth and cost-effective virtue. With the purpose of optimizing EPON system to reduce prophase investment and providing an EPON simulation platform on which new algorithms, concepts and mechanisms can be verified, we proposed and built an NS-based EPON simulation platform which is reconciled to IEEE802.3ah. In this paper, the architecture and module design of the platform are presented, implementation of the platform is depicted. In the fifth part, experiments are carried out based on the platform we built and the performance of mainstream Dynamic Bandwidth Allocation (DBA) algorithms and queue management schemes used in EPON are analyzed and compared. For the DBA, the average packet delay, jitter and system throughput under different DBA schemes are tested with the offered Optical Network Unit (ONU) load increases form 0.1 to 0.9. For the queue management block, the average packet delay, jitter, average queue size and system throughput for voice, video and data service under different queue management schemes are tested respectively with the offered ONU load increases form 0.1 to 0.9. According to the simulation results, it can be concluded that, in terms of DBA algorithms, Salira and G983.4 DBA has better performance than Fixed and Limited DBA of IPACT. In terms of queue management schemes, the three mechanisms all have their own merit and disadvantage, and the greater weight value one CoS gets, better performance it can attain. Based on that, we’ve proposed future extending and upgrading plans on this simulation platform.
	TO cite this article:Qi Li. EPON Simulation Platform with Scalability and Flexibility Using the Network Simulator NS-2[OL].[18 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26686


	8. Problems and solutions of TCP over wireless networks
	Zhang Nan,Quan Qingyi
	Electrics, Communication and Autocontrol Technology 15 December 2008
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	Abstract:TCP (Transport Control Protocol) is the most popular Internet transport protocol that provides reliable end-to-end data delivery. It was originally designed primarily designed for wired networks[7]. Random bit error rate is negligible and the main cause of packet loss is congestion in wired networks. While the emerging of wireless applications such as high-speed multimedia and wireless IP communications appeal calibration and sophisticated enhancement of this protocol to make it more suitable for wireless environment. In this paper, we presented an overview of common problems of TCP protocol over wireless networks and discussed many enhancements for TCP already been proposed.
	TO cite this article:Zhang Nan,Quan Qingyi. Problems and solutions of TCP over wireless networks[OL].[15 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26572


	9. Security Analysis and Improvements of GSM Air Interface Protocol
	Tang Qijie ,Li Xu
	Electrics, Communication and Autocontrol Technology 10 December 2008
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	Abstract:This paper presents an overview of the most widely used communications network-Global System of Mobile Communications (GSM) and investigates the current situation of the security feature. In the paper, we analyze the security structure and mechanisms in three aspects, then several attacks against the protocol including Denial of Service (DOS) attack and Man-in-the-Middle (MitM) attack are described. Last part of the paper focuses on countermeasures. Pre-authentication procedure and mutual authentication are considered to be effective ways to mitigate these threats.
	TO cite this article:Tang Qijie ,Li Xu . Security Analysis and Improvements of GSM Air Interface Protocol[OL].[10 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26448


	10. Rayleigh fading and its mitigation method used in IS-95
	Wei Guang
	Electrics, Communication and Autocontrol Technology 01 December 2008
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	Abstract:Rayleigh fading model is the most common model to describe the fading experienced by the radio signal in cities. In the first part of this paper, the statistical model for Rayleigh fading is presented, as well as the further classification of Rayleigh fading based on the parameter characteristics, with emphasis on frequency-selective fading and its usual mitigation methods. In the second part the mitigation method adopted in IS-95 CDMA: RAKE receiver, is introduced. Then, an example of 2-branch RAKE receiver is illustrated to show the advantage of RAKE receiver, together with equal gain combination technique which is one of the common three combination techniques used in IS-95.
	TO cite this article:Wei Guang. Rayleigh fading and its mitigation method used in IS-95[OL].[ 1 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26210

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