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国家自然科学基金(60472045)

作品数:7 被引量:8H指数:2
相关作者:李少谦周亮付琳张忠培刘威鑫更多>>
相关机构:电子科技大学成都信息工程大学展讯通信(上海)有限公司更多>>
发文基金:国家自然科学基金国家教育部博士点基金国家高技术研究发展计划更多>>
相关领域:电子电信自动化与计算机技术更多>>

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协同伙伴选择的公平性研究
2008年
在协同网络中,协同伙伴的选择是一个非常关键的问题。以前关于这个问题的解决方案本质上是基于收发的性能而忽略了协同伙伴选择的公平性。该文提出通过下述机制来获得公平性的一种新策略。(1)通过用户各自的计数器建立"帮助别人就是帮助自己"的机制来抑制利己主义的用户;(2)在接收端设置阈值决定是否需要伙伴中继;(3)在最大吞吐量与网络节点寿命方差之间联立以建立动态平衡。仿真结果显示:这个策略能够在性能和公平性之间达到动态平衡,从而利于整个网络的公平,其公平性优于目前所知文献的方法。
刘威鑫张忠培李少谦张严
关键词:协同分集负载均衡
分布式MIMO-OFDM系统的一种功率分配算法
在OFDM系统中,误码率主要是由经历衰落最严重的子载波决定的。为了减小深衰落子载波对系统性能的影响,本文在多径衰落信道下,提出了一种对分布式MIMO-OFDM系统的子载波进行功率分配的算法, 并进行了计算机仿真。仿真结果...
张帆唐友喜沈莹李少谦
关键词:正交频分复用功率分配信道估计误码率
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AN IMPROVED AND EFFICIENT DETECTION SCHEME FOR V-BLAST SYSTEMS WITH QAM MODULATION被引量:1
2008年
The paper proposed an improved Ordered Successive Interference Cancellation(OSIC) detection scheme for V-BLAST systems with square/rectangular Quadrature Amplitude Modulation(QAM) modulation.It utilizes an equivalent real-valued vector expression of relationship between transmit signals and received signals,exploits the constellation's product-form structure and can eventually make the order,in which components of the transmit signals vector are extracted,more "optimal" in some sense.Thereby,it can offer an improved error probability as compared to the conventional OSIC detection scheme.In addition,the paper also proposes an efficient projection al-gorithm to calculate nulling vectors in a simple recursive fashion in order to avoid the vast increase of complexity,which is due to the fact that the original complex N -dimensional data vector and M×N channel matrix are transformed into a real 2N -dimensional data vector and a real 2M ×2N channel matrix respectively.A scrutinous complexity analysis shows that the complexity increases by only 33% as compared to the conventional scheme.
Lin Huajiong Tang Youxi Shao Shihai
ESTIMATION OF CARRIER FREQUENCY OFFSETS FOR MIMO SYSTEMS WITH DISTRIBUTED TRANSMIT ANTENNAS被引量:2
2007年
The problem of estimating the carrier frequency offsets in Multiple-Input Multiple-Output (MIMO) systems with distributed transmit antennas is addressed. It is supposed that the transmit antennas are distributed while the receive antennas are still centralized, and the general case where both the time delays and the frequency offsets are possibly different for each transmit antenna is considered. The channel is supposed to be frequency flat, and the macroscopic fading is also taken into consideration. A carrier frequency offset estimator based on Maximum Likelihood (ML) is proposed, which can separately estimate the frequency offset for each transmit antenna and exploit the spatial diversity. The Cramer-Rao Bound (CRB) for synchronous MIMO (i.e., the time delays for each transmit antenna are all equal) is also derived. Simulation results are given to illustrate the per- formance of the estimator and compare it with the CRB. It is shown that the estimator can provide satisfactory frequency offset estimates and its performance is close to the CRB for the Signal-to-Noise Ratio (SNR) below 20dB.
Deng Kai Tang Youxi Lei Xia Li Shaoqian
网络编码的研究进展被引量:4
2007年
本文概述了网络编码的概念以及它的特点,介绍了网络编码在实际应用中的研究进展,同时指出了今后的研究方向。
付琳周亮李少谦
关键词:网络编码组播吞吐量
CONSTRUCTION OF NONSYSTEMATIC LOW-DENSITY PARITY-CHECK CODES BASED ON SYMMETRIC BALANCED INCOMPLETE BLOCK DESIGN被引量:1
2008年
This paper studies the nonsystematic Low-Density Parity-Check(LDPC)codes based onSymmetric Balanced Incomplete Block Design(SBIBD).First,it is concluded that the performancedegradation of nonsystematic linear block codes is bounded by the average row weight of generalizedinverses of their generator matrices and code rate.Then a class of nonsystematic LDPC codes con-structed based on SBIBD is presented.Their characteristics include:both generator matrices andparity-check matrices are sparse and cyclic,which are simple to encode and decode;and almost arbi-trary rate codes can be easily constructed,so they are rate-compatible codes.Because there aresparse generalized inverses of generator matrices,the performance of the proposed codes is only0.15dB away from that of the traditional systematic LDPC codes.
Lin Dengsheng Li Qiang Li Shaoqian
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