双载波寻呼功能开通前后问题对比分析

随着中回电信CDMA网络规模日益增长,用户数量成倍递增,整网的业务信道的负载、功率资源负载普遍在45%以下,寻呼负荷已经达到70%,而一般公认的工程安全门限是75%,这对网络安全是个隐患,寻呼信道的扩容势在必行,而目前对寻呼信道扩容经验较少,这就有必要对寻呼负荷信道进行扩客前后的效果进行分析验证.     

LTE-A移动台自适应切换无线资源管理测量带宽的方法

考虑到LTE-A系统对于移动台无线资源管理(RRM)测量的要求,急需一种能同时考虑测量精度和能量消耗的RRM测量方案。为了满足上述需求,提出了一种新的测量带宽选择方法,即自适应切换测量带宽方法。该方法使得移动台可以根据信道质量自行在窄带和宽带测量之间进行切换。仿真结果显示提出的方法能够达到足够的测量精度,同时还考虑了移动台的能量消耗。     

基于单射频的无线Mesh网多信道方法

无线网状网(Wireless Mesh Network,WMN)是一种新型的分布式宽带无线网络结构.典型的移动Ad Hoc网络具有节点移动性小、受电池动力限制和用户带宽需求大等特点,从而导致传统单信道的Ad Hoc结构不再满足WMN用户的需求.为了提供更大的带宽,多信道技术得到越来越多应用.探讨了WMN的网络结构与特点,对现有几种典型的多信道技术进行了比较,提出了一种基于单射频的无线Mesh网多信道的设计方案,不同网关节点所代理的节点使用不同的信道进行通信,从而避免了不同子网节点之间的信道干扰.通过NS2的仿真与分析表明,该方法在特定环境下的网络性能是传统单射频单信道方法的2倍.     

移动平台对无线信道特性的影响分析

针对移动平台对无线信道特性的影响,在分析移动多径信道特性的基础上,建立了不同信道模型下多普勒效应的计算机仿真模型。不仅针对不同信道衰落条件下平台移动引起的多普勒效应进行仿真,而且为进一步阐述多普勒效应的影响,还对平台移动引起的数字通信误码率进行了仿真。信真结果表明,平台移动不但会扩展多普勒频谱,而且会加快信道衰落,造成误码率上升。     

要闻速递

本刊讯英特尔公司推出了两种新型超低功率移动电脑微处理器,其中包括业界第一款工作电压低于1伏,同时功耗小于半瓦的移动微处理器。这些新型移动处理器采用了英特尔先进的处理器设计和低功耗技术,其设计目的是为体积最小的移动PC机提供高性能、最低功耗和更长电池寿命。采用英特尔SpeedStep技术的新型超低电压移动奔腾Ⅲ500MHz处理器可为重量小于三磅,高度约为一英寸的移动电脑带来卓越性能。这种处理器在300MHz的电池优化模式下工作电压低于1伏,功耗小于半瓦。英特尔同时还推出了超低电压移动赛扬500MHz处理器,具有目前业界超值准笔记本市场的最高的性能。     

移动IP的寻呼扩展技术

介绍了一种简单易行的移动IP的扩展方案,它通过对基本的移动IP协议进行简单的扩展,使其支持寻呼功能,减少大量的信令开销,使MIP能够支持大量移动用户。     

蜂窝IP技术概述

本文首先介绍蜂窝JP技术的协议机制,接着详细分析其路由、切换和寻呼等关键技术,并通过性能分析,证明蜂窝IP技术能很好地利用Mobile IP的全局移动性支持和蜂窝系统的移动切换等功能,支持频繁切换下的高速分组数据传输,适应下一代无线分组数据通信发展的需要。     

基于雨衰雪衰影响的空间信道统计模型

针对某些特殊的移动通信环境中信号的到达角度（TOA）、到达时间（AOA）等信道参数估计的复杂性，提出一种基于散射体均匀分布室外统计信道模型。该模型将树木中的树冠层作为散射体呈均匀分布在移动台与基站周围的椭圆形区域内，通过树冠层在雨雪环境中的相对介电常数来分析降雨降雪量对信号传输带来的影响，可以方便地估计出此室外微小区的空时信道参数，如AOA概率密度分布函数、TOA概率密度分布函数以及到达角度/到达时间（AOA/TOA）联合概率密度分布函数。仿真结果表明，信号的到达时间TOA以及到达角度AOA随着降雨降雪量的增大而增大，尤其当降雪量增大使得树冠层相对介电常数达到4.5时，信号的传输将被阻塞。该模型的信道参数估计结果符合理论与经验，扩展了移动无线通信信道模型的研究与应用。     

小型化低功耗接收信道设计

结合星载电子设备小型化低功耗的发展趋势,给出了基于 AD607芯片的小型化低功耗接收信道的设计方案,重点介绍了关键指标的实现方法.测试结果表明,与传统设计相比,功耗降低了50%,体积减小了40%,提高了整机的性能和可靠性.     

浅析移动应用的成本估算

随着移动通讯技术、移动数据库中间件技术及手机硬件枝术的迅猛发展,以移动商务为代表的移动应用的发展势头强劲.本文通过对移动应用技术特点的分析,提出一种通过基于分析现有应用系统开发成本,快速估算移动应用成本的方法,以期能够有效提高移动应用项目成本管理水平.     

多渠道零售视角下的互动解析

信息化发展要求零售商拓展销售渠道。当前,直复渠道、网络渠道、移动渠道以及实体渠道等交叉融合形成多零售体系。多渠道零售使消费者具有更多消费选择权。互动是多渠道零售环境下零售商与消费者沟通交流的必要方式。零售商通过有效互动维持、稳定顾客关系,确保消费者对本企业的忠诚。互动促使消费者做出渠道选择。消费者通过互动寻求边际成本与边际收益的最佳结合点,选择最为符合自身意愿或消费效果最优化的购买渠道。     

User Perceptions of Mobile and Online Channels for Purchasing Financial Products

ABSTRACT

This study investigates users' perceptions of costs and benefits of mobile versus online, PC-based, channels for accessing financial information and completing financial transactions. Results indicate that, in the financial services context, the mobile channel has no perceived advantages over the online channel. The older online channel does have several perceived advantages related to transaction cost, risk, ease of use, meeting financial goals, and information accessibility. The channels are similar on four dimensions, but most of the similarities arise because the online and mobile channels enable purchase of the same financial products. Finally, users are more willing to use the mobile channel for less risky tasks (accessing information) than they are for more risky tasks (buying financial products).     

Evaluating strategies for promoting retail mobile channel using a hidden Markov model

With the proliferation of mobile communication technology, many firms, including retailers and consumer banks, are making efforts to develop mobile platforms to better engage with their customers and reduce operational costs. However, the cost advantage of these mobile technologies will not yield fruition unless the mobile channel accounts for a significant share of total transactions. In this article, we explore potential options for firms to promote usage of the mobile channel. To achieve this, we propose a hidden Markov model to both model customers’ decisions and assess different managerial strategies through simulations. While we apply our proposed model to data from a leading financial institution, our approach is equally applicable to other retail settings. The results show that customers’ choices of services and channels are sensitive to process time by type of channel. A 10% increase in process time through non-mobile channels leads to a nearly 14% increase in utilization of mobile banking channel. Therefore, retailing firms could potentially influence customers’ choice of different channels by changing channel-specific process times. Motivated by these findings, we present and compare performances across five different policies, in promoting the usage of mobile channel. Drawing on our simulation results, we also make personalized policy recommendations to firms facing different levels of financial constraints. For those with financial constraints, we recommend a policy of increasing process time for a selected subset of service requests through non-mobile channels. Firms not constrained by the resources might be better off improving process time with the mobile channel by targeting customers identified as having a better relationship with the firm.     

移动通信中无线信道特性的研究

从等效低通信道的时变冲激响应的相关函数和功率密度谱函数出发，研究了一些描述广义平稳非相关散射(WSSUS)的无线信道特性的统计参数，并对无线移动衰落信道的特性进行分类。分析了3种常见的小尺度多径衰落信道的统计模型，给出了在平坦衰落信道中系统传输比特误码率的一般分析方法。最后，利用这些模型和方法，给出了一些常见数字调制信号的传输误码率的数值结果。结果表明：衰落对无线移动通信系统传输性能的影响是很大的，在实际中应设法消除它。     

低轨卫星系统中结合时间和移动的位置更新策略

股指期货的推出是中国证券市场发展的历史必然,沪深300指数期货将有效地完善我国资本市场,成为市场上重要的投资工具之一。本文主要分析了沪深300指数的基本特征,以及应用股指期货进行期现套利的基本策略,并指出了当前我国利用股指期货进行期现套利存在的主要技术性障碍。     

Channels for search and purchase: Does mobile Internet matter?

Recent industry reports indicate that consumers own four digital devices on an average, and switching devices during shopping is the “new normal.” The addition of mobile Internet as a new channel of search and purchase has spurred the adoption of the digital medium, and easy accessibility of the Internet on multiple devices is influencing shopping patterns. A consumer may prefer some channels for search and others for purchase or use a combination of channels to search and purchase simultaneously. As a new channel, it is unclear 1) whether mobile Internet offers greater search or purchase benefits and 2) what type of products are more suitable for mobile Internet search and purchase. In this study, we develop a framework that describes the factors that drive the use of mobile Internet in a multi-channel environment. We test the framework using survey data from a sample of U.S consumers. The main findings from our study indicate that 1) the choice of channel combinations that include mobile relative to other channel combinations increases with an increase in perceived search convenience of mobile channel. 2) in the digital channel, mobile and desktop differ in their utility along search dimensions. The probability of choosing channel combinations that include mobile increases due to search convenience whereas desktop is attractive due to perceived gains of price comparison search; and 3) mobile Internet search increases for consumers searching for utilitarian products. The insights from this study deepen our understanding of how digital media is used in the search-purchase process and have important managerial implications.     

Search,purchase, and satisfaction in a multiple-channel environment: How have mobile devices changed consumer behaviors?

The rapid adoption of smartphones and increasing reliance on the mobile Internet is influencing consumers’ shopping behavior with traditional Internet devices (e.g., desktop and laptop computers) and in stores. This research examines the effects of consumer perceptions of channels (i.e., mobile devices, computers, and offline stores) on their choices of search channels, purchase channel, and satisfaction level with the purchase channel. Using survey data from a sample of U.S. consumers, we find supplemental effects of mobile devices on computers do not alter the traditional substitution relationship between computers and stores during the search. The cross-channel effects indicate that perceived purchase benefits and costs of stores affect the purchase channel selection of mobile devices and computers, respectively. Satisfaction levels were highest when purchases were made on mobile devices. The insights from this study can help managers increase the effectiveness of advertising in different media and target distinct segments of consumers who rely on multiple channels for search and purchase.     

多星座卫星导航接收机跟踪通道结构改进

可用卫星数量的大幅增加使得传统的并行通道结构很难满足多星座卫星导航接收机的设计需求。为了减少电路规模和功耗,提出了一种通用的相关器跟踪结构,其可以跟踪GPS（Global Positioning System）/BDS（BeiDou Navigation Satellite System）/GLONASS（Global Navigation Satellite System） 3种卫星信号。该电路通过预先存储中频数据、提高相关器工作频率的方法,充分利用了每个通道的效能。这种时分复用的电路改进方法可以实现大量等效并行通道。65 nm工艺下的实验结果表明,该结构在电路资源和功耗方面优于传统结构。FPGA（Field Programmable Gate Array）的验证结果进一步证明了该电路结构的有效性和正确性。     

I need to touch it to buy it! How haptic information influences consumer shopping behavior across channels

Increasingly interactive touch-enabling technologies are mitigating the lack of haptic information for products online. This paper explores how consumers’ haptic traits – instrumental and autotelic – indirectly influence their impulse buying and channel stickiness intentions by the means of utilitarian and hedonic shopping motivations. A structural equation model investigating three shopping channels (i.e., physical, web, and mobile) reveals that haptic traits act differently across channels. Consumers with strong haptic traits prefer physical and mobile channels. The autotelic dimension is key in online channels. Findings support the implementation of effective multichannel strategies among retailers of high-haptic products, showing the mobile to be a valuable alternative to in-store shopping.