Active Antenna System mMIMO
Integrated radio with antenna featuring MIMO and beamforming
Integrated circuits and reference designs help you create Active Antenna Systems with higher bandwidth and better system reliability. Enhanced antenna technologies will be key enabling factors in the development of 5th-generation (5G) systems that will achieve significant improvements in system capacity. This paper presents a practical performance evaluation of an active antenna system (AAS) that can lead to high-capacity gain with vertical sectorization (VS). Active antennas have flexible radiation pattern control for adapting to changing situations in mobile networks. This study shows the capabilities of an AAS to improving cellular network capacity in a real High-Speed Packet Access (HSPA) network. The field trial results indicate that the AAS technology can offer 84.6% capacity gains in the downlink direction.
Modern Active Antenna Systems require:
Theme of the Project:
An active antenna is an antenna that contains active electronic components like antenna-integrated radio designs place the RF module next to the passive antenna to reduce cable losses.
Active Antenna does not need to be merely passive elements. With intelligent integration, active antenna technology transforms traditional antenna to contribute to base station efficiency. This enables operators to significantly increase the capacity and coverage targets set for their network. AAS is integrated into the antenna so as to offer possibilities for finer grained digital control of the beamforming weight of each individual sub element within the antenna. Its 3D-MIMO technologies fully utilize radio resources in both the micro- and macro-spatial domains.
3-d aspects of AAS:
Traditionally and still, evaluations in the wireless communication field use channel models with only two dimensions, even though we live in a three-dimensional world. The vertical direction is basically non-existent in these models, all UEs are assumed to be placed on ground-level. UE specific elevation beamforming is one key technique that we are exploring in the context of 3D channel models. It allows a beam to be directed in a way that suits each individual UE in the cell. For example, a UE high up in a high-rise may desire a beam pointing upwards, while a UE on the ground level may get a downwards pointing beam. The related MU-MIMO technique can be used to co-schedule UEs that appear in different horizontal and/or elevation angles. Coordinated beamforming may utilize the additional degrees of freedom provided by the elevation domain to more efficiently avoid interference on victim UEs. There are almost endless opportunities in combining the various basic multi-antenna components. The performance potential of beamforming techniques tends to increase with an increasing number of antennas, since the baseband gets access to more degrees of spatial freedom. This is facilitated by techniques for active antenna systems (AAS) where the radio is integrated into the antenna so as to offer possibilities for finer grained digital control of the beamforming weight of each individual subelement within the antenna.
AAS for 5G:
Massive MIMO is the back-bone for 5G network where 100 or more antenna elements are to be used for various benefits. But it is difficult to introduce massive-elements antennas (100 or more elements) that are required for massive MIMO into traditional base stations, attaching over 100 RF cables between each antenna element and RF TRX unit seems unrealistic and adding more RF losses. Using an AAS that combines the antennas, and RF TRX unit (transmitter and receiver chains), into one unit would be an effective way to resolve these issues. In addition to the conventional roof top mounting locations, small cells are expected to cover shopping malls, Stadiums, food canteens, or different premises. To be effective, AAS/MIMO must be able to flexibly adapt to each individual small cell user’s distribution environment, so optimum antenna structure can be offered for any individual situation in terms of the number of vertical and horizontal antenna elements and the number of independent transceivers, adding huge efficiency to the network.
Benefits of AAS :
The uses of base stations (BS’s) and access points (AP’s) with a large number of antennas called Massive MIMO (mMIMO), is a key technology for increasing the capacity of 5G networks and beyond. While originally conceived for conventional sub-6Ghz frequencies. Massive MIMO (mMIMO) is deal also for frequency bands in the range 30-300Ghz, known as millimeter wave(mmWave).Despite conceptual similarities, the way in which mMIMO can be exploited in these bands is radically different ,due to their specific propagation behaviors and hardware characterstics.
HFSS is a 3D electromagnetic (EM) simulation software for designing and simulating high-frequency electronic products such as antennas, antenna arrays, RF or microwave components, high-speed interconnects, filters, connectors, IC packages and printed circuit boards. Engineers worldwide use HFSS to design high-frequency, high-speed electronics found in communications systems, radar systems, advanced driver assistance systems (ADAS), satellites, internet-of-things (IoT) products and other high-speed RF and digital devices.
Devices Required under Texas Instruments.Inc:
· Power sequencing reference design using load switches.
· 180-W dual channel, step-down convertor reference design with 97% efficiency for server Pu.
· 1V, 20A highly synchronous buck convertor reference design.
Tools & Software Required under Texas Instruments.Inc:
· AMC 7836 12 bit integrated power amplifier analog monitor and control (AMC) system evaluation module.
· Clock Design tool-loop, filter & Device configuration+Simulation.
· Code loader software for device register programming.
· High Speed data convertor pro software.
Much more than a simple antenna element that provides tunable phase shifts, AAS is an advanced multiple-antenna BS system for optimizing network infrastructure costs and performance to meet the growing requirements of future mobile broadband services. The AAS accomplished this by utilizing the full potential of radio resources in the special domain.