收发

Under the assumption that the channel state information was available only at the receiver,the capacity of MIMO systems in Rayleigh fading channel was investigated on the basis of information theory. Three special expressions for the MIMO capacity over ergodic flat fading channel were derived.An asymptotic formula for MIMO systems with equal number of transmit and receive antennas in small SNR was also given. Simulation results show that this approximation is relatively accurate.

以信息论的观点为基础，在假设信道状态信息仅收端已知的情况下，采用等功率发射方案，研究了瑞利衰落信道下MIMO系统各态历经信道容量，推导了三种特殊MIMO信道的各态历经信道容量表达式，以及在小信噪比下等收发天线MIMO系统的容量近似公式，并通过仿真进行了验证，仿真结果表明该近似公式比较精确。

So, we combine CobraNet audio network technology, data transmitting technology, MCU technology and FPGA technology to develop interface and program of MCU, controlling PCB board, A/D converter PCB board, D/A converter PCB board, digital audio receive PCB board. At last, we construct a audio network and test it's performances.

本文紧密结合CobraNet 音频网络技术、数据传输技术、单片机技术和FPGA 技术，从事了单片机接口及控制程序设计、控制板设计、A/D 转换插卡设计、D/A 转换插卡设计、数字音频信号收发插卡设计，开发出了一系列音频网络设备，并组网测试。

The private letter of his a pair, all through respectively of the attendant secretary(call attendant a secretary again) dismantle to read to send to present and the general batch piece is also added by attendant secretary, if the airtight piece, aviso be all another to beat mark to add a fire paint to print and outside receiving and dispatch to have negligence immediately can look up.

他俩的私人信件，都经各自的侍从秘书拆阅送呈，一般批件也由侍从秘书加封，若密件、急件均另打记号加火漆印，外收发有所疏忽立即能查出。

An equipment for mixed use of wide-band ADSL and marrow-band cards features that associated LVDS transceiver and on-board connector are installed to ATVC card and WAN card. The high-speed wide band ADSL data line can use LVDS mode to conveniently realize the mixed use of wide-band ADSL and ordinary analog user card on narrow-band speech exchange or the ONU rack of optical network unit. It is connecessary to modify the backplate of POTS and machine rack. The existing narrow-band device can be upgraded to have wide-band access function.

本发明提供了一种宽带ADSL和窄带用户板混插的装置，通过在ATUC板和WAN板上提供相应的LVDS收发器和板上连接器，高速宽带ADSL数据通过背板外LVDS走线方式，可以在普通窄带话音交换机或接入网光网络单元ONU的机框上，方便地实现宽带ADSL与普通模拟用户板之间的混插，这种方法不需要对窄带话音POTS的背板和机框作任何改动，即可实现窄带到宽带的平滑过渡，对已有窄带设备可提供随时升级为宽带数据接入功能的方法及设备。

And officers on the USS Bainbridge have been talking to the pirates as well as giving them food and batteries for a two-way radio.

美国海军驱逐舰上的官员一直在与海盗进行沟通，为他们提供食物和收发两用无线电设备所需的电池。

In other words, you can attach a data terminal to a cellular telephone and send and receive information.

换而言之，你可以将数据终端接入蜂窝电话然后收发信息。

In many cases,the pen-based devices can even make and take cellular telephone calls.

在许多情况下，这些以手写输入为主的设备甚至还可以当成行动电脑，收发均可。

However,because of the complexity and changefulness of the war field,the two platforms especially the receiving platform has to maneuver.

目前，对于双机载条带式SAR的研究主要集中于等速平行飞行模式，然而由于未来战场环境的复杂性和多变性使得收发平台尤其是接收平台不得不机动飞行。

In this noisy channel, the connection-oriented protocol of data link layer is used to provide reliable delivery service for upper users.

协议通过在收发双方之间对每帧的校验确认和出错重传机制，实现数据的可靠交付。

Then short message service based on GSM is studied in detail include architecture, protocol, channel and the process of its sending and receiving.

同时，本文也对GSM网络中的短消息服务进行了具体的研究，其中包括短消息的体系结构、协议分层、使用信道和收发过程等。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。