Tag: LTE technology

The MIMO antenna technology in LTE

In LTE wireless networks, MIMO antenna technology is used. MIMO stands for Multiple Input / Multiple Output.

 

Instead of a sending and receiving antenna, in the MIMO technology, up to four transmitter antennas and four receiver antennas to be used. The corresponding codes are 4×4 four transmitting and receiving antennas, or 2×2 for two transmitting and receiving antennas. MIMO enables simultaneous transmitting multiple data streams on the same frequency. Systems with a single antenna are called SISO (Single Input / Single Output).

In principle, the multiple-antenna systems have the following advantages: First, you get a bigger reception power and thus greater range, secondly suppress interference from other radio waves better, make for a better connection quality thirdly and fourthly, for better transfer rates. However, one cannot utilize all four at the same time maximum benefits: You have to decide whether you want to improve the system in a data-transfer speed or the range or quality of the connection.

Key technology for LTE

MIMO is a key technology in LTE wireless networks, since they are the spectral efficiency is improved. However, MIMO is not only used on LTE, but also used in WiMAX and WLAN systems. By using multiple antennas, in LTE, the reception signal improved and interference can be reduced – that is, it results in less interference from other radio frequency used. But the most important: The MIMO technology is at the LTE transmission of the data stream to be distributed to up to four transmit and receive antennas. This increases the amount of data that is transferred per unit time, thus ensures a higher transmission speed – while reducing the error rate.

LTE can use up to four times four antennas, it provides for the 3GPP Release 8, which is defined in the technical specifications for LTE. Also two times two MIMO systems are possible. In a 2×2 MIMO, the data rate in comparison to a system can be doubled with a respective antenna almost.

Devices with MIMO antennas

A technical challenge may be the equipment of devices with multiple antennas – a smartphone offers relatively little room for a higher number of antennas. At low frequencies such as the 800-megahertz band, the problem is compounded by the fact that there are larger antennas needed. Especially in the countryside, however, LTE will use this frequency range. Installation of multiple antennas in laptops is problematic. Since the LTE stations will initially replace the missing country’s DSL, it imposes the use of MIMO technology is quite well possible.

 

LTE Mobile TV

The new wireless data technology LTE offers such high speeds, so that users could continue watching television on laptop or tablet PC when walking.

 

Mobile TV has long been touted, but could not yet penetrated the mass market. Well, perhaps the mobile operators offer this service via LTE later future. But one thing is clear: there will not be in vain for mobile TV. For good reception, only if the operators assure a TV subscribers in the LTE network at a certain minimum speed of transmission, in other words allocating a portion of the transmission capacity of its LTE networks for broadcasting, the customer could watch mobile TV.

 

The LTE Technology is Already There

 

With such equipment on board, a tablet PC could be upgraded into a mobile multimedia center, so it could receive sound and picture with good quality from any location via the Internet. Provided there is fast data connection at the site, either via HSPA+, which offers maximum 42 megabits per second, or if over LTE, it creates the radio channel at 50 to 100 Mbit/s speed.

 

Lack of Radio Capacity

 

If you want to transfer movies in real time over the Internet, you need at least one current transmission speed of 2.5 megabits per second, it should be high-resolution strip 10 megabits per second. These are the technical requirements for proper live broadcast. So if you want to offer television or high-definition television in this way, the operator must guarantee the customer under minimum speeds.

 

Here, TV images are also used as data packets over the Internet, however, via a DSL line and not over the air. Because IPTV is the telecom connected with further additional servies such as phone and Internet, known as a DSL 16000 connection is required – ie a line which in practice creates constant around 13 mbit/s.

 

Meanwhile, it is mobile television- and especially high-definition mobile television or even 3D TV- enter via LTE not so popular for mass market: the current wireless capacity are probably hardly enough of a large number of customers with these minimum speeds. Because it’s not enough, such a tariff is only interesting when it offered in all major cities and conurbations.

 

 

Mobile TV: Current Situation and Prospects

 

Currently, there are some deals on mobile television on smartphones. But that’s so far not overwhelming TV experience: In the early days there were frequent interruptions in sound and image, as a football fan, you might not like that. Then after the problem is fixed, you have to dodge sometimes even to the GSM network, the image and sound worse, said the testers.

 

If mobile TV has much better experience than home TV, there is only one way: A laptop with a 4G surfstick or wireless modem that can receive via DVB-T, The regular broadcast television signals. This kind of television is largely expanded coverage, but you can get in many regions of only a few publice channels and onl in the urban areas, there are also private problem.

 

It’s possible that mobile TV comes only with LTE-advanced. One this is that anyone who is watching television will have to pay an additional fare.