In this paper,we investigate the coverage optimization for LTE networks considering the network load. The network coverage is defined as the number of served users of evolved Node B(eNB)which is determined by e NBs...In this paper,we investigate the coverage optimization for LTE networks considering the network load. The network coverage is defined as the number of served users of evolved Node B(eNB)which is determined by e NBs' antenna tilt angles(ATA). The coverage is optimized by optimizing the number of served users based on the Modified Particle Swarm Optimization(MPSO)algorithm. Simulation results show that both the number of served users by each e NB and the system throughput are significantly increased. As well,the average load and the bandwidth efficiency of the network are improved.展开更多
In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-sha...In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-shaped driven monopole and a nonuniform wrapped inverted U-shaped monopole. The impedance bandwidths across dual operating bands are 89.7 MHz and 4185 MHz at the LTE-A/WWAN bands. Various techniques, such as branching and parasitic element are used to enhance the antenna’s bandwidth, the matching, and the size of the proposed antenna. The antenna is presented on an area of 50 × 15 mm2. Experimental results of this antenna show nearly omni-directional coverage and stable gain variation across the LTE-A/WWAN bands.展开更多
在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射...在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射天线数进行PBCH译码,直至正确译码为止,译码复杂度非常高。基于此,提出一种改进的天线端口数估计算法,提取各天线端口传输的小区参考信号序列做相关,通过相关值与相关系数门限值的比较直接快速获取基站的实际天线端口数。仿真结果表明：该算法相较于传统检测算法和功率检测算法在时间复杂度上分别提升了4个数量级和3倍;在信噪比高于0 d B时,所提检测算法较功率检测算法有4-6 d B的增益。展开更多
基金supported by National 863 Program(2014AA01A702)National Major Project(2013ZX03001032-004)+1 种基金National Natural Science Foundation(61221002 and 61201170)the Fundamental Research Funds for the Central Universities(CXLX13 093)
文摘In this paper,we investigate the coverage optimization for LTE networks considering the network load. The network coverage is defined as the number of served users of evolved Node B(eNB)which is determined by e NBs' antenna tilt angles(ATA). The coverage is optimized by optimizing the number of served users based on the Modified Particle Swarm Optimization(MPSO)algorithm. Simulation results show that both the number of served users by each e NB and the system throughput are significantly increased. As well,the average load and the bandwidth efficiency of the network are improved.
文摘In this paper, an internal multiband antenna is proposed for LTE-A/WWAN wireless applications in tablet computer. The proposed antenna is configured to have two branch radiators. These two branch radiators are a U-shaped driven monopole and a nonuniform wrapped inverted U-shaped monopole. The impedance bandwidths across dual operating bands are 89.7 MHz and 4185 MHz at the LTE-A/WWAN bands. Various techniques, such as branching and parasitic element are used to enhance the antenna’s bandwidth, the matching, and the size of the proposed antenna. The antenna is presented on an area of 50 × 15 mm2. Experimental results of this antenna show nearly omni-directional coverage and stable gain variation across the LTE-A/WWAN bands.
文摘在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射天线数进行PBCH译码,直至正确译码为止,译码复杂度非常高。基于此,提出一种改进的天线端口数估计算法,提取各天线端口传输的小区参考信号序列做相关,通过相关值与相关系数门限值的比较直接快速获取基站的实际天线端口数。仿真结果表明：该算法相较于传统检测算法和功率检测算法在时间复杂度上分别提升了4个数量级和3倍;在信噪比高于0 d B时,所提检测算法较功率检测算法有4-6 d B的增益。
