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1 Introduction The operating frequency band of the A-band IS95A-CDMA is: uplink: 825-835MHz; downlink: 860-880MHz. The operating frequency band of GSM is: uplink: 890-908MHz (mobile), 909-915MHz (unicom); downlink: 935-960MHz. From the operating frequency band, the downlink frequency band of CDMA is close to the uplink frequency band of GSM. If it is not properly done in the site selection and network planning, it will inevitably cause interference to GSM, resulting in a decline in the...
Firstly, the main interference types of WCDMA and GSM system co-sites are analyzed. The mathematical calculation models of various interferences are given. Then the interference between WCDMA and GSM systems is elaborated, and WCDMA and GSM are obtained. The isolation and antenna isolation requirements required for the site, and the solution in the project 1 Introduction With the opening of China's telecom market, the date of 3G license issuance is gradually approaching. For GSM network...
Most of the commercial deployments of TD-LTE in the world have adopted the construction method of co-station with the original TDD system. The TD-LTE scale test recently launched in China also chose the TD-SCDMA networking method. However, in the face of the scale-up test that TD-LTE is about to begin, the problem of insufficient resources of the TD-SCDMA site is particularly prominent. This paper introduces the TD-LTE/GSM co-site construction plan proposed by Ericsson recently, and...
A multi-mode wideband low noise amplifier (LNA) suitable for base station GSM was designed by using ADSP software from Agilent's ADS software by selecting AT41486 transistor with low noise figure, good performance and low price. The amplifier operates in the frequency range of 1700MHz to 2000MHz, the noise figure is not more than 1.8dB, the gain is not less than 13dB, the gain flatness in the band is not more than 0.5-dB, the input voltage standing wave ratio is less than 2.0, and the...
0 Preface With the advent of the new era, the automobile has also developed rapidly as an important means of transportation. At the same time, the subsequent car theft has also increased. However, most of the car anti-theft systems on the market currently have certain limitations. Therefore, a network-based anti-theft system with high reliability and security has gradually entered the field of vision. Network-based anti-theft mainly breaks through the limitation of distance, solves the passive...
With the advancement of urbanization, the role of street lamps in people's lives has become more and more prominent, and it also reflects the development level of a city. The power consumption of a street lamp system in a city is quite huge. Today, energy conservation and environmental protection have become the theme of the times. It is urgent to improve the energy utilization rate of street lamp systems. 2. At present, LED street lamp intelligent monitoring system is more integrated with...
With the advancement and popularity of cable TV technology, the inherent shortcomings of wireless TV transmission have caused the technology research to be at a standstill. Due to the relatively fixed characteristics of wireless TV receiving terminals, the research is much more difficult than mobile communication. At present, the research on wireless TV can be divided into three kinds of schemes: one is to abandon the original simulation system, adopting a new digital system, namely digital...
Overview The complexity and high density of cellular telephone circuits present a challenge for system designers, and establishing a high-quality audio recording/playback channel that meets vendor specifications can be a difficult task. New multimedia features added to the new model, such as cameras, ringtone generators, MP3 players, and voice memos, often require a greater degree of product change. This is not just about adding some new components, but also making major changes to the layout...
introduction: The SoPC-based automotive safety monitoring system uses Altera's latest SoPC (Programmable System-on-Chip) solution, the Nios processor soft core, to monitor the parking and operating status of the car with GPS and GSM systems. The SoPC-based vehicle safety monitoring system can be widely used in the anti-theft, routine maintenance and traffic accident handling of automobiles, providing an effective test method for vehicle faults. 1 system hardware components The design uses...
Abstract: The car anti-theft system is developed using GPS/GSM technology. The system uses the GPS positioning technology to obtain the position of the vehicle, determines whether the vehicle is moving, and can transmit the vehicle location information to the user through the GSM network. The user can set the working status of the system through the GSM network. The internal control of the system is completed by the single-chip microcomputer, which receives GPS data and commands from the user,...
Abstract: With the development of China's transportation industry, tracking and monitoring of vehicles is becoming more and more important in logistics and other industries. In the vehicle monitoring system, the vehicle positioning terminal mostly uses GPS technology for positioning, while the GPS positioning has high positioning accuracy but has many defects of blind spots. The location service based on GSM network can make up for the shortcomings of GPS positioning blind spots, so that it...
KVH Industries has announced that it has recently provided its 200,000th mobile satellite antenna, creating a new milestone in the mobile satellite antenna market. These antennas include KVH Industries' award-winning TracPhone series of offshore broadband (product pool supply) access satellite antenna systems and the company's award-winning TracVision family of satellite TVs (product library supply) receiving antenna systems. These two series of satellite antenna systems provide...
51 Single Chip Microcomputer and GSM Module Realize Communication 1, detect the serial line is good or bad 1) Plug the serial cable into the computer and short-circuit the 2 and 3 pins of the serial port 2) Open the serial debugging assistant 3) Click Auto-send, send a random data in the automatically sent window to see if it can receive the self-transmitted data that the serial line is normal, otherwise it is bad. 2, after the completion of the microcontroller program, take a look at the...
According to reports from foreign media, according to a report issued by the US investment bank PiperJaffrayCos today, the antenna design flaw of Apple’s newly launched iPhone 4 smart phone will affect the sales revenue of this phone. GeneMunster, an analyst with PiperJaffray in Minneapolis, pointed out in his report that as the world's highest market value technology company, Apple may lose up to 20% of its sales in the United States, because customers think that antenna design will affect...
Watching TV is already a kind of leisure and entertainment project that we all are accustomed to in daily life. If everyone wants to watch TV and there are wireless signals in areas where there is no cable TV signal, then try to do this TV antenna together! Material: Hard wire (copper wire, for home use) about 2 meters TV signal cable (preferably longer, we have to put the antenna on the balcony) TV signal plug Wooden sticks or other items that can hold an antenna Specific steps: First of all,...
A few days ago, Xiaomi released the millet router 3, priced at 149 yuan, will start on April 6 rice flour festival. Millet router 3 uses a minimalist and ultra-thin design, the front is only designed with a logo and an indicator light, while the back of the fuselage is designed to lay four antennas can be laid flat, white main colors make the router more versatile. More importantly, Xiaomi's router 3 is equipped with four external omni-directional multi-element vibrator high-gain antennas,...
Rohde & Schwarz announced the ZVH, a new handheld antenna line analyzer at the 2010 Electronica in Munich. ZVH is specially designed for the installation of antenna feeders of base stations or transmission towers. It can quickly and easily complete the acceptance test of the field. ZVH's unique wizard function can help users easily complete antenna, cable, filter and amplifier testing. Users can easily generate test reports using document functions. Compared to other instruments, ZVH...
August 5 news, Xiaomi has released a lot of router products, and these routers are still performing a product update every time. This millet quietly released a millet router 3C, millet router 3C uses an external four-antenna design, support 802.11n protocol, 2.4GHz single-frequency, equipped with MT7628N processor, priced at only 99 yuan. Specific highlights, Xiao Mi routers use a dual system ROM design, the main system and the backup system two ROM. At the same time, you can also use the APP...
An antenna is a transducer that transforms a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space), or vice versa. A component used in a radio device to transmit or receive electromagnetic waves. The ratio of the total input power of the antenna is called the maximum gain factor of the antenna. It is more comprehensive than the antenna directivity coefficient to reflect the effective utilization of the antenna to the...
This umbrella equipped with 12 flexible solar panels on the umbrella surface not only can be used for sunshading, but also can charge your mobile phone. In just 3 hours, the general mobile phone can be fully charged. At the same time, the built-in antenna of this umbrella also has the function of enhancing the signal of the mobile phone, and can serve the mobile phone within a radius of one meter.
With the official release of the 3GPP 5G standard NSA solution, the development of 5G NR-related commercial products has accelerated, and 2018 will be a key year for 5G standard determination and commercial product development. At present, 5G is in the critical stage of standard determination, and the international standard organization 3GPP will complete the international standard of the first version of 5G SA in June this year. China started the 5G R&D and testing at the beginning of...
The vast majority of GPS antennas are right-hand-polarized ceramic media, and their components are: ceramic antennas, low-noise signal modules, cables, and connectors. The ceramic antenna is also called passive antenna, dielectric antenna, PATCH, which is the core technology of GPS antenna. The signal reception capability of a GPS antenna depends largely on the ingredients of its ceramic components. The low noise signal module, also called LNA, is the part that amplifies and filters the signal....
Feasible method: The satellite antenna interface is preset on the balcony, and then the signal is distributed to each room through the satellite signal distributor. If you need to watch satellite TV, you need a satellite TV receiver in this room. (Note: The best satellite TV signal line, directly connected to the receiver, do not use the wiring panel to prevent signal attenuation) More advanced (complex) methods: Purpose: The satellite signal can be mixed into the cable TV signal in the room....
[China Instrument Network Instrument R&D] A few days ago, an antenna spherical near-far field measurement system was successfully completed. The device can meet the measurement requirements and provide technical support for line measurement and measurement and calibration capabilities. Recently, the United States NSI company and his party came to the China Electronics Standardization Institute to help build an antenna near-far field measurement system. The measurement system uses the...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.