qam antenna

Question: In a rectangle, there are n Cities '*'. Now all N cities need to cover wireless networks. If a base station is placed, it can cover at most two adjacent cities.How many base stations can be placed to ensure that all cities are

An original Mini-game inspired by gold miners and big fish. In fact, this game has been played for two weeks and is only uploaded until now. Some bugs have not been fixed yet. No way. Busy. Recently, I am engaged in a large-scale webgame with

compatible with the DVB-C system planned to adopt in China. This will inevitably result in a waste of device incompatibility in the future. Therefore, the use of DVB-C QAM modulation, not only improve the network capacity, but also compatible with the future development trend. It is the rational choice of broadband multimedia information system, which is suitable for the expressway of China's national conditions by adopting the

what kind of technology to take is unknown.Channel assignment for 80211AAccording to the following formula, you can assign a number to a channel in the 5-ghz band and 5 MHz between channels:Center frequency (MHz) = 5,000+5 x n;n = 0,1,2, ... 199Center frequency (MHz) = 5,000–5* (256-n), n=240,241,.. 255Each 802.11a channel with a bandwidth of 20-mhz occupies four channels. The channel center frequency is as follows3 80211g,80211a application in 2.4G Band (2.4G)80211G Technology (OFDM and

. Compared with the 11n 64 QAM, 11ac has a higher density modulation scheme, reaching 256 QAM. In the Wave 2 stage, 11ac will adopt multi-user MIMO technology with the emission beam forming function. The basic concept of MU-MIMO (multi-user MIMO) is very simple: A 11ac access point can send data to four clients at the same time (the client must also support MU-MIMO ), at the same time, an independent "Space

stream, 64-QAM modulation, and a single channel. With all technologies (Channel binding, MIMO, and higher modulation) that have been used to improve the performance of traditional frequencies over the past decade by 802.11, the Wi-Fi industry can easily achieve faster speeds. There is a metaphor in the industry: the current 60 GHz technology is equivalent to the ". 11b stage" of technological evolution ". We are opening up an exciting technology road

At present, China's broadband access network has developed very mature and many new technologies have emerged. Here we introduce the development status of VDSL and analyze some of its problems, I would like to share it with you here and hope it will be useful to you. 1. Technical Standards of VDSL VDSL currently has two major incompatible technical standards: one is DMT discrete multi-audio modulation, and the other is CAP and QAM without carrier ampl

Rate (MB/s) 800ns GI 400ns GI 0 1 Bpsk 6.5 7.2 1 1 Qpsk 13.0 14.4 2 1 Qpsk 19.5 21.7 3 1 16-qam 26.0 28.9 4 1 16-qam 39.0 43.3 5 1 64-qam

(which makes 802.11ac very attractive to enterprises ). Finally, remember that the generation of 802.11ac is costly-and costly. This cost is not only for access points, but also for new PoE switches with higher power 802.3at standards, which are required by the new 802.11ac AP. Signal path control greatly improves the value of 802.11ac To make 802.11ac more effective, it is necessary to improve the signal path control capability in the RF spectrum. Taking the transition from 802.11g to 802.11n

greater than the speed of traditional Modem or ISDN. ADSL Modulation Technology Currently, three ADSL Modulation technologies are widely used internationally: Quadature Amplitude Modulation and Carrierless Amplitude-plase Modulation ), discrete Multitone DMT (Discrete Multitone ). 1. QAM modulation technology In QAM modulation, the data sent in the bit/Symbol encoder is divided into two channels with an or

basic elements of label, reader and Antenna. (4) Uwb:ultra wideband, or Ultra wideband technology. UWB communication is also known as carrier-free baseband communication, almost full digital communication system, the need for RF and microwave devices are few, so can reduce the complexity of the system and reduce costs. three, wireless technology advantage and disadvantage analysis (i) WLAN technical analysis Wi-Fi technology and products have

of the lower frequency, demodulation, channel decoding, multiplexing, decompression, Video coding and audio DAC, and sends the analog video/audio output signal to the TV set, thus realizes the interactive video/data information service. At present, the most influential digital broadcasting standards are DVB,DSS and large Alliance DTV, which DVB for satellite broadcasting, cable television and terrestrial broadcasting in different forms are divided into dvb-s,dvb-c and DVB-T. This scheme uses s

This is for the only free mini PCI-E slot models, such models are also more common, especially in some international brands of models. With the mini pci-e slot, according to the method of the previous period to add 3G network card and mobile card slots, this time only need to install 3G antenna is done. Buy Antennas as needed The price of the notebook antenna is very cheap, the general double price will n

, the interesting square expectation is converted into the system's auto-correlation and cross-correlation items (the Gini-Markov equation), and the estimation methods of these two items do not need to be asked more, it is only effective when fast correlation is used. This is why FFT can still be used after theories such as modern spectral estimation, AR model, and MA model are applied. At least in terms of calculation, the self-correlation method is the simplest method for estimating known AR p

tree + (PVST +) is deployed to achieve uplink load balancing, you can also obtain a high level of stack permanent. Long-distance Ethernet Technology LRE technology uses orthogonal amplitude modulation (QAM ). The QAM amplitude modulation uses the signal amplitude and phase to define each symbol. LRE adopts the most advanced QAM technology, has a variety of

Design and simulate Wireless LAN device antennas [Date:] Source: /21IC Author: How Siang Yap and Bart Van Hecke of Agilent EEsof EDA Department [Font: large, medium, and small] 　 By adopting polarization diversity technology, low-cost PCB substrates can be used to create Wireless LAN equipment (WLAN) antennas with good receiver performance. This article will describe how to use the latest 3D electromagnetic field (EM) simulation tool to design and simulate a 2.4 GHz orthogon

The concept of radar was formed in the early 20th century. Radar is a transliteration of radar, abbreviated as radio Detection and Ranging. It is an electronic device that uses microwave band electromagnetic waves to detect targets. Composition The specific use and structure of various radars are different, but the basic form is the same, including five basic components: the transmitter, the transmitting antenna, the receiver, the receiv

data, wireless optimization mainly includes the following aspects in the engineering hardware. 1. Relocation of the base station. The main point is to adjust some unreasonable base station to give full play to the function of the base station and achieve the coverage target. If a base station antenna is in front of a tall building seriously blocked, a base station antenna hanging high, resulting in seriou

I'm sure everyone knows about the three major wireless 3G standards. Therefore, there is a unique and advanced technology in the TD wireless technology, which is different from the other two technologies-smart wireless technology, that is, smart antenna technology. The Smart Antenna, formerly known as the Adaptive Antenna Array AAA and Adaptive

mode, 802.11a/B/g wips can detect their existence. however, if these rogue devices operate using 802.11n data rates, they can be detected and prevented using only 802.11n-ready wips solution. Back to Top Technology Q. What is MIMO?MIMO stands for multiple inputs and multiple outputs, which means a device with multiple transmitters emitting signals and a device with multiple receivers signing ing the signals. a mimo system is often represented as nxm where N is the number of inputs and m is the