pigtail antenna

(including ISI and adjacent channel interference ICI) suppression, and smart antenna technology to maximize the reliability of the physical layer. For example, the performance can be further optimized by combining technologies such as adaptive modulation, adaptive encoding, dynamic sub-carrier allocation, and dynamic bit allocation algorithms. In addition, compared with single-carrier systems, OFDM still has some disadvantages, which are susceptible

and Electronics Engineers. IEEE 802.11b, also known as Wi-Fi, uses an open 2-4 GHz direct sequence spread spectrum with a maximum data transmission rate of 11 Mbps, you can also adjust the transmission rate to 5.5 Mbps, 2 Mbps, and 1 Mbps Based on the signal strength. No linear transmission is required. The maximum outdoor transmission range is 300 meters, and the maximum indoor transmission range is 100 meters if obstacles exist. This is the most widely used transmission protocol. How wide can

sure that network technicians configure and test according to the following suggestions. Wireless Network deployment 1. Configure the antenna installation location This is the first step to achieve "non-leak" wireless access nodes. the wireless signal coverage is used to determine the location of the Access Node antenna. Do not place the antenna next to the wind

to penetrate it. This is a problem that many netizens are most concerned about. We all hope that wireless signals can penetrate at least the wall in the House to Improve the Ability of wireless signals to penetrate the wall. An effective way is to increase the gain of the antenna, when purchasing Wireless AP, we 'd better choose products with high antenna gain. Generally, at least 2 dBi is required. Based

Although the wireless relay mode has a high cost, its advantages are still adopted by many network construction methods. Next, we will introduce the application of the wireless relay mode in the actual network construction of wireless networks. Go to the following link. Establish network connection in wireless relay Mode You can build a relay Bridge in two ways. A single bridge is used as a relay and two bridges form a relay point back-to-back. A single bridge can be connected to two antennas th

Network Collaboration of TD-LTE Is there mutual interference between the TD-LTE and the current 2G system in the adjacent frequency? How can this problem be solved? A: In actual network deployment, the F-band (1880-1915 MHz) TD-LTE base station will be affected by the stray/blocking/Intermodulation Interference of DCS1800, the Second Harmonic Interference of GSM900 and the interference of PHS Base Station. Figure 1 frequency distribution chart near F band The interference introduced by the 2G

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

Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 8718 Accepted: 4327 DescriptionThe Global aerial Centre have been allotted the task of building the fifth generation of mobile phone nets in swed En. The most striking reason so they got the job, is their discovery of a new, highly noise resistant, antenna. It's called

The use of wireless networks has also brought wireless network security problems. Because the wireless network is different from the wired Network physical node access controllability, the wireless network security problem is more worthy of our attention. For the wireless network currently in use, we can improve the security of the wireless network by using several settings. 1. Disable unauthorized access The key to securing wireless access points is to prohibit unauthorized users from access

, power and instructions. The new Route 2 appearance and before in the use of r6300 almost, "induction cooker" like modelling, simple design and pure white color to make the overall look more elegant, but also more easily and home color integration. The front of the fuselage is attached to the use of antennas and some tips, "Newifi" logo printed right below. The new Route 2 employs MediaTek's mt7621a dual-core CPU solution, with the highest single core frequency up to 8

wireless AP or wireless router does not power up or does not work properly, causing the wireless client to not connect at all. (3) When the wireless client distance from the wireless AP, we often use directional antenna technology to enhance the transmission of wireless signals, if the angle of the antenna has problems, will also lead to wireless clients can not connect properly. (4) If the wireless clie

Internet (the operating system can be replaced if necessary). Of course, also pay attention to some wireless router's web configuration, for example, in the WAN settings of a wireless router, it is preferable to "automatically connect, connect automatically after power-on and disconnect" instead of "manual connection, manual connection by user" or "on-demand connection, automatic connection when there is access to data", This reduces some of the "drop" illusion that occurs when a user has not

by at least 5dBm or above when different channels are changed. If the Wi-Fi signal is great, you don't have to worry about channel selection. Also, if it is too far away from the router, wear more walls, then the impact of the channel is relatively small, you can not worry about. But if you find your home Wi-Fi signal, its strength is not enough to the neighbors, you can try a different channel, such as "13", if not too many people in your nearest neighbourhood to choose channel "13"

security of building wireless networks, the compatibility of wireless devices, and so on. Today we are going to talk about how the office realizes the Wireless network environment. Range of wireless signal coverage Just now we talked about the advantages of using wireless network, we also want to talk about some of its shortcomings, first of all, the wireless network coverage is one of the factors we should consider. Speaking of the signal coverage, first we need to see its transport protocol,

Misunderstanding, the stronger the signal, the better. First of all, let's take a look at some of the wireless product hardware indicators: transmission power, acceptance sensitivity and antenna gain. At present, the main disadvantage of wireless network in the range of signal coverage and transmission rate, usually enhance the signal method is to improve the transmission power and enhance the antenna gain

switching, soft switching, softer switching, relay switching), uniform and reasonable base station load, the best pilot frequency distribution. The optimized parameters include: The transmitting power of each sector, the position of antenna (azimuth, dip, height), the neighbor table and its pilot priority, the search window of the neighborhood pilot set, and the switching threshold value. In the process of network optimization, can be participated b

wireless bridge connects an antenna to form a bridging relay to ensure high-speed wireless link communication. The two back-to-back APS can be in different frequencies and work in the wireless bridge mode at the same time, so that their functions can be expanded and the signal can be maximized during the forwarding process. Increase the bandwidth and speed to the maximum, so as to meet the high requirements of users, to ensure their smooth degree.

The starting point of establishing a secure wireless network access node (access point) is to prevent information leakage from unauthorized external access. This principle is often difficult to understand. The security settings of wireless networks are much more complex than those of ordinary cable networks, because the access nodes of the cable networks are fixed and within the signal sending and receiving range of wireless networks, all nodes can be connected. Problems caused by the characteri

The previous article introduced the basic introduction of the built-in wireless network card. I think you have some knowledge about some common types of built-in wireless NICs. Next we will talk about the selection and upgrade of the built-in wireless network card. Hope to help you. ◆ How to select and upgrade a built-in wireless network card If conditions permit, you can choose a laptop with a built-in wireless network card, which is more convenient to use. Of course, laptops with built-in wire

confidence, and it will never be "fooled ". These four aspects are: Brand and design, quality and performance, simple and easy to use, and the key is price. 1) brand and Design Needless to say, a large brand determines everything about the product, and network products are no exception. A good brand includes the product quality, quality, and after-sales service. Please note: do not purchase products from small factories. The products of small manufacturers cannot guarantee quality or provide st