ofdm modem

There are two common ways of Internet access through ADSL: server sharing and router sharing. If you don't want to waste a computer as a server, you can check whether your ADSL Modem has the routing function (the instructions are provided ), if the ADSL Modem with the routing function is used, the Modem itself can be used as a host. Let's take a look at the speci

Diagnosis Technology 1. the physical layer and its diagnostic physical layer are the most basic layers in the OSI layered structure system. Based on the communication media, the physical interfaces of the system and the communication media are implemented to transparently transmit data link entities, provides services to establish, maintain, and remove physical connections between computers and networks. Physical Layer faults mainly occur when the physical connection mode of the device is corre

Article Title: Simple Network check (2 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 2. confirm that there are no problems with the online devices such as the network line, hub, modem, and so on: Hardware: 　　　 After you have completed the network card check (please confirm that the network card can really work

All vro users have encountered vro configuration faults. Here we mainly introduce how to completely solve vro configuration faults. In the case of connectivity problems in the serial port, in order to eliminate the serial port faults, generally, the show interface serial command is used to analyze its screen output report content and locate the problem. The start of the serial port report provides the interface status and line protocol status. Possible Combinations of interfaces and line protoco

Details of several common troubleshooting methods for routers, and details of several troubleshooting methods1. Serial Port troubleshooting When a connectivity problem occurs in the serial port, in order to eliminate the serial port fault, the show interface serial command is generally used to analyze its screen output report content and locate the problem. The start of the serial port report provides the interface status and line protocol status. Possible Combinations of interfaces and line pro

Small Business office network using ADSL sharing internet economic benefits. Upgrading the ADSL modem is a highly technical work. If you are careless, you may be able to cause the device to not work properly, so please think twice before you do it! The common practice is to use a hub with Proxy server software, using a computer as a proxy server, other computers through this agent sharing ADSL Internet. But this way of sharing the Internet, with the

receiving this MBSFN sub-frame to interpolate channel estimation between the RS of the neighboring subframe as it would when receiving a unicast signal. Therefore, the RS design of the MBSFN must be able to support channel estimation within an orphaned sub-frame.In addition, because the multi-cell merging greatly increases the number of multipath, so that the frequency selectivity of the MBSFN signal is much larger than the unicast signal, so the need for greater RS frequency domain density. Ba

time domain, the number of OFDM symbols per PHICH group is related to the phich_duration parameters (carried in the MIB) given above, as shown in the following table.As you can see, either LTE-FDD or LTE-TDD, if the Phich_duration=normal,phich group is mapped only to one of the OFDM symbols . As motioned.If phich_duration=extended, then the Phich group can be mapped to 2

channel, it is unclear) 2Mbps Transmission Using the DQPSK (differential quadrature phase shift keying), a total of 4 phase carrier, each carrier difference 45 °, so that the information carried in the RF signal than DBPSK added a cup, each carrier represents two bit of data.The same transmission 01001101, DQPSK only half the time (the retention period of each carrier is constant) 5.5Mbps and 11Mbps In DQPSK based on the use of CCK code, CCK coding there are two ways

and demodulation techniques are described below.Quadrature amplitude Modulation (QAM)In modern communication, it has been one of the focus of attention to improve the spectrum utilization. Quadrature amplitude modulated QAM (quadrature amplitude modulation) is a kind of modulation method with high frequency spectrum utilization, which has been widely used in medium and large capacity digital microwave communication system, CATV network high-speed data transmission, satellite communication syste

Http://www.cnblogs.com/fakis/archive/2011/04/14/2016213.html1. Folding Mode You can use the following options to set the folding mode: Set OFDM = xxx in the vim configuration fileYou can directly call the vim command/* VIM: Set OFDM = xxx: */using annotations in the file :*/ There are 6 Ways to select the fold:1 manual definition folding2. More indent indicates more advanced collapse.3 expr use expre

requirement. However, even if the download speed is 8 Mbits/s and the upload speed is 1 Mbits/s, our online on-demand movies, software downloads, and online chats will feel fast (hundreds of times more than normal dial-up Modem )! More importantly, using ADSL to access the Internet does not interfere with each other, and there is no need to make phone calls to access the Internet. Of course, the cost of ADSL is also very low (1). You do not need to p

Z500 dual-core CPU,CPU speed is 800MHz, memory space 512MB, hard disk space 8GB, the screen is 4.3 inches, the resolution of up to 800x480 pixels, is a no-compromise netbook [2]. However, the VCP08 battery can only support 2 hours of computer operation [1].Word, VCP08 equivalent to a MTK Feature Phone on an XP computer.Figure 8.3 faked picture, a laptop bundled a MTK phone.Courtesy Http://farm3.static.flickr.com/2735/4308553311_a01df766d6_o.pngIs it possible to make a computer phone, that is, a

whether the problem is resolved. If the problem persists, continue until the fault disappears. Layered Network diagnosis technology Physical Layer faults mainly occur when the physical connection mode of the device is correct, the connection cable is correct, and the configurations and operations of devices such as Modem, CSU, and DSU are correct. The best way to determine whether the physical connection of a vro port is intact is to use the show int

from the host to the local router.2. Check two wide-area network ports.3. Check whether the host is connected to the WAN port of the Peer router.4. Check the Ethernet port of the host to the peer router.Use the telnet command to remotely log on to the peer vro, and check the LAN connection of the peer by checking the Ethernet port from the local host to the local vro.5. Repeat 3 and 4 to check the recipient's local location.6. After the above steps, the problem persists. Please contact your age

use of cable modem technology to realize the "triple net integration" based on the original CATV network, and to build a unified The network can carry a variety of service types, flexible user interface and wide spectrum of access bandwidth from narrowband to broadband, and take advantage of the existing equipment and unique advantages of CATV network, by providing high speed Internet access method and appropriately developing local service in accord

Small-sized enterprise office networks use ADSL shared Internet access, which is cost-effective. Upgrading ADSL Modem is a highly technical task. If you are not careful, the device may not work properly. Therefore, please think twice before you start! The general practice is to use the hub with the proxy server software, using a computer as the proxy server, other computers share the Internet through this proxy. Without such Internet sharing, there ha

The following content from: http://www.aikko.com/bbs/viewthread.php? Tid = 13417 extra = page % 3D1 With the popularity of ADSL, people enjoy the speed of broadband, and network security has been paid more and more attention. Have you ever thought that your ADSL account and password are actually exposed on the Internet? Using some tools and techniques, you can easily obtain your account and password to access the Internet, and even purchase products such as QQ coins, lianzhong monthly card, and

problem is resolved. If the problem persists, continue until the fault disappears.Layered Network diagnosis technologyPhysical Layer faults mainly occur when the physical connection mode of the device is correct, the connection cable is correct, and the configurations and operations of devices such as Modem, CSU, and DSU are correct. The best way to determine whether the physical connection of a vro port is intact is to use the show interface command

Broadband routers in China are developing very rapidly. Here we mainly introduce the access to ADSL Modem with routing functions, including the access to ADSL Modem + Broadband Router. At present, ADSL permeate every corner of our lives, whether it is enterprises, Internet cafes, or home users using ADSL to access the Internet, usually, an ADSL line can only support one computer to access the Internet, howe