In the meantime , an improvement about the sage algorithm is proceeded on the basis of finite alphabet characteristic and pilot information of the 3g communications system 同时，由于第三代移动通信系统具有有限字符特性，并且存在上行链路导频信息，本文基于这两点对sage算法进行了改进。
Through simulation we can see that wcdma system has a good performace under high bit rate service because of the advanced coding technology , we can also see that this performance is better in downtlink than uplink 由此可以看出wcdma中编码技术的使用使其在高速率下有较好的链路特性，并且下行链路性能优于上行链路。
It is well know that the solid - state linear power amplifier is one of the most important part of transmitter in the telemetry and remote control system . its main function is to amplify the upconvertor ' s signal 众所周知，线性固态功率放大器是遥测遥控系统中遥控分系统发射机的重要组成部分，它完成对上行链路信号的放大发射功能。
The design of pn code synchronization should find a trade - off between the performance and the complexity of the reciever . in this paper , the pn code synchronization technique in spread spectrum communication is introduced 本论文首先介绍扩频系统中采用的pn码同步技术,然后结合wcdma上行链路的特点,提出适合wcdma上行链路的扩频码同步方案。
This paper analyse all kinds of interference of tdd - cdma system in detail , establish interference model ; based on this , establish multiple access interference module of uplink . in some sense , tdd - cdma is based on smart antenna 本论文详细研究了tddcdma系统存在的各种干扰，建立了干扰模型；并以上行链路为例，建立了上行链路多址干扰模型。
2 ) in the arithmetic of beamforming algorithm ( lcmv , etc ) in up link , some arith - metic meanings are compared and the differences exist in practical application in system tdd and fdd are particularly analyzed as well 2 ：上行链路中智能接收的波束形成算法；对比了一些算法(如lcmv与esb算法)的性能，并且详细论述了tdd系统与fdd系统在应用智能天线上的不同。
Second , a maximum likelihood estimator ( mle ) that jointly estimates the carrier frequency offset ( cfo ) and the channel response of each user in uplink ofdma systems based on generalized carrier assignment schemes is investigated in this research 其次,在任意结构子载波分配方式的ofdma上行链路中,研究了一种联合载波频偏和信道的最大似然估计( ml )算法。
Hsdpa is written in release5 to increase transmit speed in certain time . as researchers found that the amount of data between downlink and uplink is unequal , and the former one has a larger amount than the latter one 针对3g系统中不对称的上下行传输,下行链路业务量普遍大于上行链路业务量这一典型特征, 3gpp在release5协议版本中提出了hsdpa概念,旨在提高某一时刻的传输速率。
This protocol and api was developed for bandwidth limited messaging applications such as remote telemetry where messages are typically short and the cost of a network connection is expensive for example satellite uplinks 该协议和api是为带宽有限的消息传递应用程序而开发的，例如远程的自动测量记录，这里的消息通常很简短，并且网络连接器的费用非常昂贵（例如卫星上行链路） 。
Ethernet provides best effort service , which does not provide quality of service and equity for different users . the topology structure of epon system contains many onus , which share bandwidth in the uplink direction using tdm method 由于以太网提供尽力而为的服务,不能保证不同业务的服务质量以及不同用户的公平性;另外, epon系统的拓扑结构是由多个onu采用时分复用方式共享上行链路带宽。
