针对国内地铁的车-地无线通信技术,将LTE(long term evolution,长期演进)与WLAN(wireless local area networks,无线局域网)技术进行对比,提出一套LTE组网方案。针对该方案,分析下行链路预算,对LTE基站的覆盖能力进行评估,认为引入LTE后...针对国内地铁的车-地无线通信技术,将LTE(long term evolution,长期演进)与WLAN(wireless local area networks,无线局域网)技术进行对比,提出一套LTE组网方案。针对该方案,分析下行链路预算,对LTE基站的覆盖能力进行评估,认为引入LTE后,地铁中覆盖了多频段的无线通信系统;由于系统间频率相近,无线信号之间容易形成干扰。从干扰形成的角度分析干扰的成因,定量计算系统间的隔离度,从技术和工程建设角度给出减少干扰的措施。展开更多
重点研究了LTE系统中存在承载PDCCH(physical downlink control channel,物理下行控制信道)传输的信息冗余和PDCCH盲检效率较低的问题,提出了一种改进的计算CFI值的方法。该方法按照速率匹配值的降序为各个PDCCH分配1/2/4/8个CCE(contro...重点研究了LTE系统中存在承载PDCCH(physical downlink control channel,物理下行控制信道)传输的信息冗余和PDCCH盲检效率较低的问题,提出了一种改进的计算CFI值的方法。该方法按照速率匹配值的降序为各个PDCCH分配1/2/4/8个CCE(control channel element,控制信道元素),再复用各个PDCCH。仿真结果表明该方法能够有效地消除冗余信息,减少PDCCH盲检的平均次数。展开更多
LTE (Long Term Evolution) is the latest technology in wireless communication. It is being used because of its peak data rate and spectral efficiency. LTE uses OFDMA (Orthogonal Frequency Division Multiple Access) tech...LTE (Long Term Evolution) is the latest technology in wireless communication. It is being used because of its peak data rate and spectral efficiency. LTE uses OFDMA (Orthogonal Frequency Division Multiple Access) technology for radio transmission and reception in downlink. OFDM is a multicarrier modulation and multiplexing technique to improve data rate, spectral efficiency and minimize the problem of fading and ISI (Inter Symbol Interference). Many transceivers design have been designed for OFDM system to minimize error and maximize throughput of the information being transmitted and received at the system. The purpose of this article is to present a survey of the published literature which deals with various OFDM transceiver design, focusing on the merits and demerits of the corresponding OFDM transceiver design.展开更多
文摘针对国内地铁的车-地无线通信技术,将LTE(long term evolution,长期演进)与WLAN(wireless local area networks,无线局域网)技术进行对比,提出一套LTE组网方案。针对该方案,分析下行链路预算,对LTE基站的覆盖能力进行评估,认为引入LTE后,地铁中覆盖了多频段的无线通信系统;由于系统间频率相近,无线信号之间容易形成干扰。从干扰形成的角度分析干扰的成因,定量计算系统间的隔离度,从技术和工程建设角度给出减少干扰的措施。
文摘LTE (Long Term Evolution) is the latest technology in wireless communication. It is being used because of its peak data rate and spectral efficiency. LTE uses OFDMA (Orthogonal Frequency Division Multiple Access) technology for radio transmission and reception in downlink. OFDM is a multicarrier modulation and multiplexing technique to improve data rate, spectral efficiency and minimize the problem of fading and ISI (Inter Symbol Interference). Many transceivers design have been designed for OFDM system to minimize error and maximize throughput of the information being transmitted and received at the system. The purpose of this article is to present a survey of the published literature which deals with various OFDM transceiver design, focusing on the merits and demerits of the corresponding OFDM transceiver design.
