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wahaha
2011-10-21, 12:00 AM
Guys, some reading for you...
Please share any relevant documents about beamforming if any :)

The MIMO antenna technologies used are key to the overall MIMO performance. Additionally MIMO beamforming is an option that is coming to the fore.
As various forms of technology improve the MIMO antenna technology can be pushed further allowing techniques like MIMO beamforming to be considered.

MIMO antenna & MIMO beamforming development

For many years antenna technology has been used to improve the performance of systems. Directive antennas have been used for very many years to improve signal levels and reduce interference.
Directive antenna systems have, for example, been used to improve the capacity of cellular telecommunications systems. By splitting a cell site into sector where each antenna illuminates 60° or 120° the capacity can be greatly increased - tripled when using 120° antennas.
With the development of more adaptive systems and greater levels of processing power, it is possible to utilise antenna beamforming techniques with systems such as MIMO.

MIMO beamforming smart antennas

Beamforming techniques can be used with any antenna system - not just on MIMO systems. They are used to create a certain required antenna directive pattern to give the required performance under the given conditions.
Smart antennas are normally used - these are antennas that can be controlled automatically according the required performance and the prevailing conditions.
Smart antennas can be divided into two groups:
Phased array systems: Phased array systems are switched and have a number of pre-defined patterns - the required one being switched according to the direction required.
Adaptive array systems (AAS):This type of antenna uses what is termed adaptive beamforming and it has an infinite number of patterns and can be adjusted to the requirements in real time.

MIMO beamforming using phased array systems requires the overall system to determine the direction of arrival of the incoming signal and then switch in the most appropriate beam. This is something of a compromise because the fixed beam is unlikely to exactly match the required direction.
Adaptive array systems are able to direct the beam in the exact direction needed, and also move the beam in real time - this is a particular advantage for moving systems - a factor that often happens with mobile telecommunications. However the cost is the c[/B]onsiderable extra complexity required.

rocketfire
2011-10-24, 10:11 AM
try looking for smart or adaptive antennas first...
_http://www.********.com/web/Business/Solutions/Industry%20Solutions/Service%20Providers/Wireless%20Operators/Wireless%20Broadband/wi4%20WiMAX/_Document/StaticFile/A_Practical_Guide_to_WiMAX_Antennas_White_Paper.pdf


Smart Antennas—Beamforming (http://www.altera.com/end-markets/wireless/advanced-dsp/beamforming/wir-beamforming.html)

wahaha
2012-04-27, 12:09 AM
Hi,

Please find attached dual layer beamforming technology document from DT mobile.
Appreciate your reputation on this sharing.
Thanks :)

wahaha
2012-05-05, 12:36 AM
Hi,

You can find the following post about Beamforming mechanism from Dancestorm's thread:

http://www.finetopix.com/showthread.php?29132-Beamforming-Antennas-for-Wireless-Communications&p=178861&highlight=#post178861

wahaha
2012-05-09, 06:46 PM
Hi,

Does anyone is doing LTE network planning & optimization.
Would like to understand that:

a) Under what condition will have MIMO and Beamforming switching triggered?
b) Is Beamforming only deploy on rural area?

Appreciate your feedback if you have the knowledge about beamforming in LTE.
Thanks.

wahaha
2012-05-16, 11:38 PM
Hi,

Please find attached document about Enhanced Beamforming Technique from China Communication
Appreciate your reputation on this sharing.
Thanks.

wahaha
2012-05-16, 11:40 PM
Hi,

Please find related Huawei document about MIMO and Beamforming in LTE Multiple Antenna system as below.

http://www.finetopix.com/showthread.php?29226-Huawei-LTE-Multiple-Antenna-system-MIMO-and-Beamforming&p=179177#post179177
(http://www.finetopix.com/showthread.php?29226-Huawei-LTE-Multiple-Antenna-system-MIMO-and-Beamforming&p=179177#post179177)
P (http://www.finetopix.com/showthread.php?29226-Huawei-LTE-Multiple-Antenna-system-MIMO-and-Beamforming&p=179177#post179177)/S: You may find posted LTE documents, go to my profile, then go to "Find latest started threads"