更新和同步链路状态数据库。
研究了频率选择性瑞利衰落信道中的同步MC-CDMA系统上行链路空时信道估计及多用户检测算法。
The space-time channel estimation and multiuser detection algorithm for the uplink of multicarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel were investigated.
提出了一种基于功率谱叠加的交织正交频分多址系统上行链路载波频偏和定时同步联合估计算法。
A joint blind estimation method based on spectrum overlap for uplink interleaved orthogonal frequency division multiple access carrier frequency offset and timing synchronization is proposed.
在卫星星座内的时间同步中，为满足时间同步信号的传输要求，需要对星间链路进行分析和设计。
It is necessary to analyze and design the intersatellite link (ISL) for satisfying the requirement of time synchronization signal transmitting in satellite constellation time synchronization.
文中对网络内部通信划定了界线，明确了它的主要任务，并对内部通信链路和同步过程作了详细的描述。
For the communication within the network, this article introduces its definition, basic tasks, internal communication channels and synchronization process.
在第二章介绍了传统OFDM的基本原理，并建立了OFDMA系统的下行链路模型，在此基础上研究OFDMA系统的同步技术。
The second chapter describes the basic principle of the conventional OFDM and establishes a downlink OFDMA system model, which is the basis for researching synchronization technology for OFDMA system.
首先，通过双星定位系统双向链路获取定时定位信息，将双向测距数据及时问同步误差数据进行处理、保存；
At first, synchronization information from the Tow_stay located system, disposes and saves the data of synchronization time and distance detacted.
对于专用信道，同步原语用于指示上行和下行无线链路的同步状态。
For the dedicated channels, synchronisation primitives are used to indicate the synchronisation status of radio links, both in uplink and downlink.
链路中节点同步时并不是必须通过接收发送消息的方式，由已知的两节点的频偏和相偏范围就可以确定第三个节点频偏和相偏范围，从而确定其时间范围。
Links nodes not be necessary to send messages to the each other, known of the two nodes 'time can determine the scope of the third node's offset and drift, then determine its local time.
在上行链路中每个用户由于载波频率偏差而存在潜在的不同步，这样使子载波之间失去正交性，从而在基站接收端产生多用户间干扰。
However in uplink channel, each user has its own frequency offset which leads to a loss of orthogonality among the sub-carriers and multiuser interference at the base station receiver.
上行同步的维持是根据收到的下行链路的定时，发送上行链路定时提前量来实现的。
Uplink synchronization is maintained in 1.28 Mcps TDD by sending the uplink advanced in time with respect to the timing of the received downlink.
一种在移动通信系统中通过使用下行链路发射功率控制（TPC）比 特来通知终端上行链路同步获取的方法。
A method of informing a terminal of uplink synchronization acquisition in a mobile communication system by using downlink transmit power control (TPC) bits.
一种在移动通信系统中通过使用下行链路发射功率控制（TPC）比 特来通知终端上行链路同步获取的方法。
A method of informing a terminal of uplink synchronization acquisition in a mobile communication system by using downlink transmit power control (TPC) bits.
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