共查询到20条相似文献,搜索用时 125 毫秒
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针对CPM系统的信道容量研究结果进行了综述,并推导计算了Rayleigh衰落信道下CPM的容量分析方法与计算结果。首先回顾了CPM系统的基本概念及其有限状态马尔可夫模型,并对AWGN信道下CPM的可达信息速率计算方法进行了讨论;然后将其推广到Rayleigh衰落信道,推导出在该信道下计算CPM容量的算法。考虑了接收端已知信道状态信息及未知信道状态信息2种情况。在导出容量计算的算法后,通过Monte Carlo仿真给出了在AWGN及Rayleigh衰落信道下几种典型CPM方案的容量曲线。 相似文献
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从寻呼信道的负荷计算和短信业务在寻呼信道上发送机制两个方面来阐述信道负荷与短信业务发送之间的关系;并以石家庄系统为例计算寻呼信道负荷,分析了短消息在寻呼信道上的发送算法。 相似文献
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采用稳定点分析方法对一点多址通信系统的随机预约信道进行了理论分析,计算出预约信道的吞吐量。用马尔可夫链理论,对通信系统的数据信号的通信量和信道利用率进行了分析,给出了计算结果. 相似文献
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本文主要研究了MIMO信道的相关性及其相关矩阵的计算问题,并结合OFDM技术。分析了MIMO-OFDM相关信道的理论特性。运用Jakes信道模型,对独立传输信道、完全相关传输信道、部分相关传输信道进行了仿真,进一步分析了MIMO-OFDM相关多径信道的有关特性。 相似文献
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本文通过呼损率与用户数的计算,分析了多信道共用的优越性,并对 PRC-9的传输信令方式、检测指配信道方法、自动搜索空闲信道时电台内的频率变化及有关电路原理等进行了分析和测试,给出了 PRC-9建立电台间通话的流程图。 相似文献
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文章通过对接入信道对反向链路的干扰分析得出了接入信道所允许的利用率,并且在一定假设条件下计算出了现网中一个扇区的接入信道的实际利用率和短消息数,以及呼叫模型及载波数的关系,文章还对CDMA2000的接入控制过程进行了分析,并与IS-95在接入信道方面进行了详细的对比。 相似文献
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首先分析了寻呼信道的特性和帧结构;然后通过分析寻呼信道发送的各种消息的内容,对每个内容的长度进行了计算,并得出了每种消息相对于寻呼信道总容量的寻呼信道占用率;最后给出了在一定假设条件下,一个寻呼区域中BHCA值和寻呼信道负荷的关系。 相似文献
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介绍一种多通道温度控制器的主要技术性能,描述了该控制器以8098单片机为核心的硬件系统和软件结构,并就程序设定功能和应用效果全了全面分析,实际控制结果表明:该控制器具有较高的温度控制品质。 相似文献
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A new configuration of codes is proposed for translating user information into a constrained channel sequence. The new configuration makes it possible to practically apply constrained channel codes whose efficiency approaches the channel capacity 相似文献
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基于话音优先的网络资源配置,针对广西移动华为设备PDCH信道配置不规则,导致信道被限制、空口资源被浪费、用户感知差等问题,对华为BSC6900系统中FPDCH的配置策略进行了研究,总结出一套配置策略,在不增加投资的情况下,既提升了网络质量又提高了载频的话务承载能力。由于网络规模较大,从投资效益的角度来看也是相当可观的。 相似文献
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在LTE系统中,PCFICH信道配置主要作用是指示PDCCH控制信道在一个子帧内占用OFDM符号的个数,PDCCH控制信道数量直接影响小区可调度用户数和峰值速率.为了找出不同场景下最优的PCFICH信道配置,以达到最高的用户终端吞吐率,本文通过计算不同PCFICH配置数下的理论峰值速率,对用户数分段进行试验,并结合实际... 相似文献
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Zhou Xiangyun Sadeghi Parastoo Lamahewa Tharaka A. Durrani Salman 《Wireless Communications, IEEE Transactions on》2009,8(3):1177-1181
We study the optimal antenna configuration (i.e. number of transmit and receive antennas) for multiple-input multiple-output systems in pilot-symbol-assisted modulation schemes with imperfect channel estimation. We assume block flat-fading channels and focus on a practical range of high signal-to-noise ratio. An ergodic capacity lower bound is used as the objective function to be maximized. We analytically study the capacity gain from adding extra antennas to the transmitter or to the receiver in two different scenarios. Our numerical results show that the optimal antenna configuration under imperfect channel estimation can be significantly different from that under perfect channel estimation assumption. In addition, we investigate the capacity gain from optimizing antenna configuration and find that the gain can be larger than that achieved by optimizing transmit power over pilot and data symbols, particularly for large block lengths. 相似文献
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Nuno Pratas Nicola Marchetti Neeli Rashmi Prasad António Rodrigues Ramjee Prasad 《Wireless Personal Communications》2012,62(1):93-106
We propose in this paper a dual-antenna-array (with transmitter antenna array and receiver antenna array) architecture, where
the antenna elements are divided into several antenna element sets and each traffic channel is transmitted over an antenna
element set, to realize the multiple traffic channels set up by a user. A SINR feedback based algorithm, which can regulate
the transmission rate by iteratively adjusting the power on each traffic channel, is proposed to execute the rate control
for the proposed dual-antenna-array architecture under cochannel interference. It is shown that the proposed algorithm can
make the throughput meet the throughput requirement or achieve the weighted bandwidth sharing for certain fairness. In addition,
we further propose a traffic channel configuration algorithm to help the SINR feedback based algorithm find the optimal traffic
channel configuration that can meet the throughput requirement for each traffic channel or results in the maximal total throughput
for each user. 相似文献
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Design,Fabrication,and Testing of Single Side Alignment of 16×0.8nm Arrayed Waveguide Grating 总被引:1,自引:1,他引:0
A novel design of 100GHzspaced 16channel arrayed-waveguide grating (AWG) based on silica-on-silicon chip is reported.AWG is achieved by adding a Ybranch to the AWG and arranging the input/output channel in a neat row,so the whole configuration can be aligned and packaged using only one fiberarray.This configuration can decrease the device’s size,enlarge the minimum radius of curvature,save time on polishing and alignment,and reduce the chip’s fabrication cost. 相似文献