Distributed mimo is promised as a key technology in future wireless communication systems due to its unique merits such as large system capacity , low transmit power , uniform and enhanced coverage and low radiation on the human body 由于分布mimo具有高容量、低功耗、更好的覆盖、对人体的低电磁损害等独特的优势,被认为是未来无线通信系统中的重要技术。
This method not only modulates system capacity by using refrigerants of environmental protection , but also avoids additional energy consumption . it is likely to gain better modulation effect than other methods 这种调节方式不但利用了环保型的混合工质有效地调节了制冷系统的制冷量,而且不产生附加能量损失,与其他容量调节方式相比,有可能获得更好的调节效果。
As a key technique in cdma communication system , the multiuser detection can jointly detect the signals transmitted by all the users , thereby alleviate the " near - far " effect , cancel the mai and increase the system capacity 在ds cdma通信系统中,多用户检测是将各用户发送的信号做联合检测,缓解了远近效应问题,并且有效地消除了多址干扰,使系统容量得到提高。
With this inner concatenated codes , the performance of ber ( bit error ratio ) and system capacity can be controlled by adjusting the dimension of stbc ( space - time block codes ) in the inner concatenated codes according to the channel parameters 这种编码方式可以在既定的发射天线数下,根据信道环境的优劣,通过调整内接码中空时分组码维数来控制系统误码率性能和系统容量。
The mimo technology is considered as the key technology in the next generation of wireless communications ( beyond 3g / 4g ) , which deploys multi antennas at both transmitter and receiver to enhance system capacity without using additional bandwidth Mimo技术被认为是新一代移动通信( beyond3g / 4g )的核心技术之一,它利用多个天线进行收发,能在不占用过多带宽的情况下提高系统的容量。
The simulation experiments show tha it is because the pefformance of multiuser detection is wuced into power control that the request on powe control is reduced , the perfrmance of powe control is improved and the system capacity and qos of users are etwed 实验结果表明,多用户检测效果的引入,有利于降低对功率控制的要求,改善功率控制的效果,提高系统的软容量和用户的服务质量。
In recent years , the mobile communication has witnessed a rapid growth , from 1g system to 3g system , then to the 4g system that is being designed . the goal is the same one : to improve the system capacity and promote the quality of service 近年来,移动通信得到了快速发展,从第一代到第三代以及正在制定的第四代移动通信标准,都是向着提高系统容量、改善系统通信质量的方向发展。
With the fast development of mobile communication services , the conflict between spectrum resources and customer ' s demand grows more and more rapidly . for cdma system , the contradiction between the system capacity and link interference is greatly incisive , too 移动通信业务的飞速发展,使得频谱资源和用户需求间的矛盾越来越突出;对于cdma系统,系统容量和链路干扰间的矛盾也日益尖锐。
In order to evaluate system capacity . putting out system efficiency , update cycle of measure data , incident transmission delay . analyzed each parameters . deduced out calculation formula of each parameters 为了对所设计的系统容量进行评价,提出了系统效率,测量量更新周期,事故传输延时等几个系统性能参数,并对几个参数的物理意义进行了分析,进一步推导出了性能参数的计算方法。
On the base of above . aiming at a practice system . applying target function , optimize design capacity . calculated each performance parameters , evaluated system capacity . at last , concluded that the method have great value in practice 在上述基础上,针对一个通道结构己经确定的实际系统,应用前述目标函数进行了最优化的容量设计,并计算了各个性能参数,在此基础上对所设计的系统容量进行了评价。