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国家自然科学基金(60572117)

作品数:7 被引量:6H指数:1
相关作者:刘守印谢文武黄光明郑军樊艳更多>>
相关机构:华中师范大学郧阳师范高等专科学校更多>>
发文基金:国家自然科学基金湖北省自然科学基金Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry更多>>
相关领域:电子电信天文地球更多>>

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A Novel Subcarrier Allocation Scheme for Adaptive Multi-user MIMO-OFDM Systems to Maximize the System Capacity
<正>In this paper,we investigate the subcarrier allocation schemes for downlink adaptive multi-user multiple in...
Guoliang Shen Shouyin Liu Dept.of Electronic and Information Engineering,Huazhong Normal University Wuhan 430079,China
关键词:ADAPTIVEMULTI-USER
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Low complexity joint time offset and frequency offset estimations for LTE uplink system被引量:1
2014年
The orthogonal frequency division multiplexing(OFDM) is currently used in long term evolution(LTE) system. The time offset estimation(TOE) and frequency offset estimation(FOE) of OFDM is essential in mobile communication base. According to the conventional cross correlation TOE and FOE algorithms, a new cross correlation computation was proposed to estimate the time offset and frequency offset for LTE uplink system, so that the time offset and frequency offset can be estimated simultaneously with low complexity. Compared with the conventional TOE and FOE algorithms, the simulation show that the proposed can reduce complexity and improve performance for FOE with good performance for TOE in additive white Gaussian noise(AWGN) and multipath channel.
WANG JunQIN Qi-zhenLIU Shou-yinLI Ting
关键词:FOETOELTEOFDM
Improved positioning algorithm based on two step least square in NLOS environments被引量:1
2011年
Non-line-of-sight (NLOS) propagation is a major source of error for accurate time-of-arrival (TOA) location estimation. The two-step least square (LS) method, which does not need any information about the distribution of the NLOS error, has been studied in related researches to provide efficient location estimation of the mobile terminal (MT). By observing the estimation of the error covariance matrix in the two-step LS method, this paper finds that the measured distances are more suitable than the initial estimated distances by maximum likelihood (ML) algorithm in NLOS environments. Moreover, by making use of the geometry relations among fixed terminals (FTs), some measured distances which are corrupted by big NLOS errors may be reduced. Further, an iteration method can be adopted to further improve the performance of the algorithm. Accordingly, an improved algorithm based on the two-step LS method is proposed. Simulation results demonstrate that the improved algorithm has better performance than the two-step LS method and converges more quickly. Meanwhile, it is robust in different NLOS environments.
WU Shi-xun LI Ji-ping-yin LIU Shou
关键词:TOA
空间相关MIMO信道天线选择系统闭合容量式
2007年
在空间瑞利相关信道下,笔者推导了混合选择/多输入多输出系统(H-S/MIMO)信道容量的精确表达式。以2发送天线和2/3接收天线的MIMO系统为模型,使用MATLAB对该系统进行了仿真。结果表明,理论分析与仿真曲线相吻合,进一步说明文中理论分析的正确性。
刘传勇章平谢文武刘守印
关键词:相关信道天线选择
Frequency offset estimation based on peak power ratio in LTE system
2013年
Orthogonal frequency division multiplexing (OFDM) is one of the key techniques for long term evolution (LTE) system. Frequency offset estimation of OFDM is an essential issue. Especially in the high-speed environment, the frequency offset will become large. Based on the features of LTE uplink physical random access channel (PRACH), this paper proposes a new frequency offset algorithm by using peak power ratio to enlarge the range of frequency offset estimation. According to the relation between frequency offset and the power delay profile (PDP), the ratio of the peak power of the PDP at the main window to that at the negative window or positive window is utilized to estimate frequency offset. Simulation results show that the new proposed algorithm extends the estimation range of frequency offset from 1 000 Hz to 1 250 Hz. Meanwhile the accuracy of frequency offset estimation is almost not lost. Particularly in low signal noise ratio (SNR), the new algorithm has lower mean square error (MSE) compared with traditional phase differential algorithm.
WANG JunGUAN BaoLIU Shou-yinXIE Wen-wu
关键词:LTEPDP
一种新的超准正交空时网格码及性能分析
2007年
提出了一种新的超准正交空时网格码(SQOSTTC),这种新的超准正交空时网格码是在一种基于旋转因子的准正交空时分组码的基础上提出的,它可以取得全速率和完全分集,并且不增加编码和解码的复杂度.本文通过分析编码增益距离(CGD)和成对差错概率,对新的超准正交空时网格码的性能进行了分析.理论分析和仿真实验结果表明,在相同的频谱利用率下,本文提出的超准正交空时网格码比Jafarkhani等人提出的超准正交空时网格码的性能有明显的提高.
窦俊辉王俊刘守印
关键词:空时编码性能分析
基于四阶累积量的MIMO信道及其相关性的联合估计(英文)
2007年
MI MO技术一直受到人们的广泛关注,并被广泛采用于各种移动通信系统的标准化协议中.在此系统中用到的分集合并和空时解码技术都需要以准确估计的信道状态信息为前提条件,以往的信道估计都是在MI MO系统子信道间是非相关的假设下进行的.事实上,由于天线之间距离的限制和传播路径散射体的不充分,子信道之间常常存在一定的相关性,常称为空间相关.另外,在信道估计、天线选择和自适应调制等方面需要已知(估计)这一参数.但是,要精确估计信道的相关性非常困难,到目前为止,这一问题没有得到很好的解决,以至于在大部分关于信道估计的文献中都是预先假定已知信道的相关特性.本文运用四阶累积量理论对MI MO信道及其相关矩阵进行了估计.仿真结果表明,本文所提出的方法具有较高的估计精度.
谢凌谢文武刘守印
关键词:四阶累积量MIMO信道估计
UWB系统的一种改进型伪混沌跳时多址接入技术被引量:4
2007年
对于伪混沌跳时多址接入系统,混沌映射关系和多址接入调制方式对系统的性能均有影响.当参数设置一致时,双帐篷(double-tent)映射是贝努里(Bernoulli)映射进行伪混沌跳时多址接入时数据传输速率的两倍;当速率一致时,前者的系统误码率更低.本文对双帐篷映射伪混沌跳时的跳时调制多址接入方式进行改进,采用二进制相移键控(BPSK)调制,得到的多址接入系统误码性能更好.这种改进型多址接入系统与贝努里映射的伪混沌跳时多址接入系统相比,不仅改善了系统误比特率,还提高了数据传输速率.
樊艳刘守印黄光明郑军谢文武
关键词:多址接入二进制相移键控
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