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	1. Selection of High Speed ADC in the Application of Digital IF Receiver for OFDM
	Tong Jiaxin,Gao Jinchun
	Electrics, Communication and Autocontrol Technology 13 December 2012
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	Abstract:When it comes to the design of digital intermediate-frequency (IF) receiver, how to select an optimum high-speed analog to digital converter (ADC) is a key point. This paper presents an effective method in the selection of ADC and the main consideration is signal to noise ratio (SNR), which contains the influence of peak-to-average Ratio (PAPR). A helpful formula is derived that can combine the power of input signal with ADC's quantitative peak. This paper provides calculation model for OFDM and analysis of simulation result using MATLAB. It turned out that the practical ADC's resolution bits should be left three digits allowances. In addition, the noise figure (NF) of ADC is discussed in digital IF receiver and RF directly-sampling digital receiver.
	TO cite this article:Tong Jiaxin,Gao Jinchun. Selection of High Speed ADC in the Application of Digital IF Receiver for OFDM[OL].[13 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4499664


	2. Optimal Transmit Schemes for CR MIMO Systems Under The Average Interference Power Constraints
	Zhao Lu,Lin Gan,Xie Gang
	Electrics, Communication and Autocontrol Technology 12 December 2012
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	Abstract:Considering the statistical properties of Rayleigh fading channels, this paper tries to gain the average interference power (AIP) constraint for Primary User (PU) in CR MIMO system and studies the optimal transmit strategy for a Cognitive Radio(CR)link to maximize the ergodic capacity subject to the AIP constraint and CR transmit power constraint. Then we compare it with the counterpart subject to the peak interference power (PIP) constraint for PU and the same CR transmit power constraint. Simulation results show that the former can not only reduce the algorithm complexity but also improve the CR ergodic capacity.
	TO cite this article:Zhao Lu,Lin Gan,Xie Gang. Optimal Transmit Schemes for CR MIMO Systems Under The Average Interference Power Constraints[OL].[12 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4500464

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	3. The introduction of DVB-RCS satellite communication system
	LIU Ming,YANG Qing
	Electrics, Communication and Autocontrol Technology 04 December 2010
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	Abstract:VSAT is a new satellite communication system from 1980s. This system is flexible, reliable and convenient. Because of great advantages, VSAT develops rapidly during these years. However, this system can only transmit low bit-rate information, the top limit is 19.2kbit/s. With the rapid development of modern society, VSAT can no longer meet our needs. DVB is the second generation of VSAT, it can support broadband transmission. In this paper, an advanced DVB satellite communication system will be introduced, This DVB-RCS system has been deployed widely all over the world. First of all, a brief introduction on DVB-RCS will be given. At the second place, this system will be described in detail. Furthermore, the principle of DVB-RCS will be analyzed. At last, a conclusion will be given.
	TO cite this article:LIU Ming,YANG Qing. The introduction of DVB-RCS satellite communication system[OL].[ 4 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4395058


	4. Full QoS Scheduler for WiMAX
	Zhou Yan
	Electrics, Communication and Autocontrol Technology 02 December 2009
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	Abstract:A full QoS scheduler (FQS) is proposed for multi-rate WiMAX system. Unlike existing algorithms which using multi-state Markov channel model, FQS considers both packet delay and packet error rate. FQS prefers flows destined to high capacity and low error rate channel and flows with large lagging. Simulation results demonstrate that FQS provides higher throughput and lower delay than existing algorithms.
	TO cite this article:Zhou Yan. Full QoS Scheduler for WiMAX[OL].[ 2 December 2009] http://en.paper.edu.cn/en_releasepaper/content/37178


	5. A Belief Propagation Multi-user Detection in Synchronous CDMA Systems
	Hong Cheng,Xie Songzi,Quan Qingyi
	Electrics, Communication and Autocontrol Technology 21 September 2009
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	Abstract:In this paper, we propose a novel multiuser detection algorithm called Belief propagation derived from the well-known belief propagation. It has an error probability performance that overtakes the sequential cancellation detection algorithm while only polynomial times of basic calculation are needed. As a generalized version of multistage detector, its different view of the problem is more adaptive to performance analysis.
	TO cite this article:Hong Cheng,Xie Songzi,Quan Qingyi. A Belief Propagation Multi-user Detection in Synchronous CDMA Systems[OL].[21 September 2009] http://en.paper.edu.cn/en_releasepaper/content/35342


	6. Implementation of Network Listen for TD-SCDMA Femtocell
	Xu Xiaochuan
	Electrics, Communication and Autocontrol Technology 18 August 2009
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	Abstract:In this paper, a novel network listen (NWL) system based on PC202 is proposed for TD-SCDMA femtocell. Femtocell is a low-cost, low-power base station for improving indoor coverage, which should be deployed without much consideration to cell planning because of its auto-configuration. We propose the hardware and software architectures of the NWL system. Controlled by a user application, the system can scan the air interface, detects neighboring cells for available resources and configure the femtocell without the management of the network provider. According to the test results, they can meet the requirements of TD-SCDMA standard.
	TO cite this article:Xu Xiaochuan . Implementation of Network Listen for TD-SCDMA Femtocell[OL].[18 August 2009] http://en.paper.edu.cn/en_releasepaper/content/34531


	7. Performance Evaluation between the Co-existing Systems of TD-HSDPA and TD-SCDMA
	Huang Yunfei ,Wei Zaixue,Yang Dacheng
	Electrics, Communication and Autocontrol Technology 29 July 2009
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	Abstract:As an important step in the evolution of TD-SCDMA system, TD-HSDPA system offers higher data rate and network capacity. TD-SCDMA network is now under deployment in China. And TD-HSDPA will also start to be deployed in the near future. Research on the co-existence between these two above mentioned systems is very important to the deployment of TD-SCDMA network and TD-HSDPA network. But related research is quite limited. In this paper, the system performance of TD-SCDMA system and TD-HSDPA system is studied when they are co-existing. Some important simulation assumptions, including the deployment scenario, the propagation models and the interference models are described in this paper. Besides, impact on system capacity due to the co-existed systems is investigated. And finally, some advises on the deployment of TD-HSDPA and TD-SCDMA systems are given.
	TO cite this article:Huang Yunfei ,Wei Zaixue,Yang Dacheng . Performance Evaluation between the Co-existing Systems of TD-HSDPA and TD-SCDMA[OL].[29 July 2009] http://en.paper.edu.cn/en_releasepaper/content/34146


	8. 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


	9. 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


	10. 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

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