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介绍了在掌上电脑中集成ITM100双频GPRS模块和MF-500 RFIC读写模块的设计方案,将两个模块集成在一个小小的插卡中,通过掌上电脑自带的PCMCIA插槽与掌上电脑实现数据通信。由于PCMCIA接口出来的是8位并行数据,而两个模块都是用串行口发送和接收的,因此用ST16C550串并转换芯片实现他们的接口,这样也可以防止板间干扰。详细介绍了系统的硬件电路实现、掌上电脑与两个模块之间的接口方式,以及两个模块的数据格式和软件操作方法。最后给出了电磁兼容性设计的要点。 相似文献
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将机顶盒与CA(条件接收)系统分离,是数字电视发展的必然趋势.本文介绍了数字电视机顶盒机卡分离的几种实现方案,重点介绍采用DVB-CI接口标准及其在机顶盒上的实现,以及在此接口上的高层应用. 相似文献
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介绍了双槽PCMCIA/CardBus电源控制器TPS2216的功能特点,正常工作温度设计,并给出了TPS2216的典型设计电路. 相似文献
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Jean-François Frigon Ahmed M. Eltawil Babak Daneshrad Eugene Grayver Yuan Li Gennady Poberezhskiy 《Wireless Personal Communications》2007,43(4):1101-1112
Smart antenna array technology has been shown to greatly improve the performance of wireless communication systems. In this
article, we describe the impact of smart antenna array processing at the mobile terminal for Wideband Code Division Multiple
Access (WCDMA) cellular networks. Using system simulations we demonstrate the quality of service, network coverage, and network
capacity improvement provided by a WCDMA dual antenna receiver and we establish a relationship between this improvement and
the link level performance. We then describe a receiver architecture for a dual antenna WCDMA mobile receiver. The proposed
receiver was implemented, as part of a complete mobile terminal solution, in an ASIC using a 0.18 μm, 1.8 V CMOS technology.
The ASIC was integrated with RF, analog and digital components in a PCMCIA card form factor. The PCMCIA is a 3GPP compliant
user equipment and has been submitted to standardized performance and conformance tests. Experimental measurements gathered
with the PCMCIA card illustrate the impact of a diversity enabled mobile data terminal on the link level performance. For
various propagation environments and transmission data rates, improvements in the range of 2.7 – 10 dB in the required DPCH
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or for a 1% Block Error Rate (BLER) were observed. These measurements are within 1.4 dB of the ideal link level simulations
which indicates that the predicted improvement at the network level should also materialize. The results presented in this
paper show the tremendous potential of smart antenna arrays in 3G WCDMA cellular networks and establish diversity as a viable
solution for high-speed cellular communications. 相似文献
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介绍了国内的3种机卡分离方案,并通过分析清华大学UTI标准的完善过程,总结机卡分离方案设计中存在的实际问题和解决方案.最后对未来的机卡分离技术进行了展望. 相似文献
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数模一体电视机是电视广播由模拟技术转换到数字技术的过渡时期的最佳选择,数字电视信号质量好,比传统的模拟电视信号有明显的优点.而且数模一体电视机比用机顶盒的方式效果好、简单、方便.本文介绍一种数模一体电视机通用处理方案. 相似文献
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由于串行总线速度不断提高,笔记本电脑上的RS 232接口已经取消。为了实现工控设备通过RS 232接口与笔记本电脑相连接的需求,利用笔记本上未经使用的PCMCIA接口进行扩展。选用OXCF950芯片,并利用该芯片内部的E2PROM对串口进行设置。给出了系统的实现方案,通过4片OXCF950芯片可扩展出4个独立的串口,大大提高了笔记本带外设的能力。由于串口的并行性,系统具有很高传输速率。 相似文献
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