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LTE MIMO
LTE MIMO
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LTE MIMO

Product Feature:


Multiple Input Multiple Output Technology

Support Multiple Antennas to Receive and Dispatch Multiple Spatial Streams at the Same Time, Improve Performance.

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From 2008 to 2013, mobile data service increased 60 times. Next 3 years, global mobile data traffic compound growth rate at 78.3%. In 2018, global Smartphone users will reach 4.5 billions. According to Ericsson mobile forecast, then data traffic will increase to 12 times.

About 70% of the data services in indoor, therefore indoor network coverage quality improvement and capacity increase will be the key of the mobile Internet era of competition.

The main role of the LTE Indoor Distribution MIMO Extended System (LIMES) is to help operators to reduce the difficulty in setting up dual MIMO antennas, shorten the construction period, and ensure the high quality service performance in indoor LTE network engineering and deployment.

The main role of the LTE Indoor Distribution MIMO Extended System (LIMES) is to help operators to reduce the difficulty in setting up dual MIMO antennas, shorten the construction period, and ensure the high quality service performance in indoor LTE network engineering and deployment.

TD-LTE active antenna system refers to a one-lined indoor coverage system which uses a full-duplex, RF linear amplified distribution equipment using in the fourth generation TD-LTE mobile communication network, and adopts frequency conversion technology, realizing double current or more of TD-LTE MOMO signal transmission by using one feeder.

● Active combiner: Access NE of TD-LTE dual active antenna system. Downlink receives multiple signals with multiple modes from RRU, processing the MIMO signal from RRU of TD-LTE equipment and combining with signals of other modes, and then transmit to the active antenna through the distribution system.  Uplink signal of multiple modes from active antenna, including TD-LTE signal processed by the active combiner, will combine and transfer to the signal port of RRU. All signal only exsits in one form.
 Active Antenna: Peripheral unit of TD-LTE dual active antenna system. Uplink processes the TD-LTE signal from the terminal of the coverage area and combines with other signals of other modes then transmits to the active combiner through distribution system. Downlink accesses signals of multiple modes from the active combiner. TD-LTE signal processed by active antenna will combine with other signal of other modes to cover. An integrated type of active antenna should be provided in this system.Peripheral unit integrates with passive antenna.
● Coaxial remote feeder unit: Providing remote power feeding for the remote active antenna through a coaxial cable and transmitting the RF signal of uplink and downlink at the same time. Only exsits in integrated form or split form.
● Access NE: Access network element in this system is defined as active combiners.
● Peripheral units: the peripheral unit in this system is defined as the integrated active antenna closest to the user client.
● Passive branch: one signal channel of dual active system.  Only bypass processing the input signal.
● Active branch: one way (or N-1 way) signal channel of dual active system. Frequency conversion processing accordingly based on the characteristics of the input signal.
● Overcurrent combiner: the combiner providing feeder channel for the indoor distribution system through direct current. 
● Overcurrent coupler: the coupler providing feeder channel for the indoor distribution system through direct current.
● Electric appliance: feeder unit getting direct current from the indoor distribution system, without the function of blocking the direct current
● Feeder: feeder unit feeding the direct current into the indoor distribution system, the RF input port with the function of blocking direct current.                    

System Functions of TD ---- LTE active antenna system

No.ItemsDescription
1MIMO functionSupport multiple input multiple output processing of TD-LTE signal
2Multi-networkThe system accesses 2*2 (or N*N) MIMO TD-LTE signals by using a single feeder besides it can access one or more signals of GSM DCS TD-SCDMA Supports GSM channel carrier automatic tracking
3Signal accessAccording to the characteristics of signal distribution by configuring different passive components there can be at least two accessing methods

a 3-way inputs of active combiner one way of GSM/ DCS+TD-SCDMA two ways of TD-LTE

b 2-way inputs of active combineronewayofGSM/DCS+TD-SCDMA+TD-LTEonewayofTD-LTE
4MIMO Power controlMonitoring the power of two channels(orNchannels) TD- LTE signal and automatically balancing amplitude difference within 3dB
5Monitoring FunctionWith the remote monitoring function remote monitoring supports TCP/ IP or SMS Referring to the monitoring protocol of China Mobile can be extended based on the mobile requirement afterwards. Each active combiner can monitor at least 50 active antennas. The attenuation of active combiner and links between active antennas is within 10-40 dB can be normally query and setup. Remotely upgrading function Remotely upgrading the active antenna via active combiner.


TD-LTE Active Antenna System----System RF Specifications

ItemsSpecifications
Frequency Range of active branch2320~2370MHz
Max Output Power of active branchDownlink: 13±2dB Uplink: ≥-20dBm
Max Gain of active branchDownlink: 8±3dB; Uplink: 15±3dB。Note: Concatenate the feeder unit and the 26db attenuator for test between the active combiner and the active antenna.
Gain Adjustment Range/step of active branch≥ 25dB/1dB
Gain Adjustment ErrorWhen gain within 0-20dB, ≤1dB;When gain >20dB, ≤1.5dB
Ripple in band of active branch≤3dB (1M of guard band not under consideration)
Noise Figure of active branch≤8dB (Active Combiner is directly connected with the active antenna)
Time Delay of active branch≤1us
ACLR of active branch≥45dBc
EVM of active branchEVM≤5%
Frequency Error of active branch≤±5×10-8
Spurious Emission of active(passive) branch9KHz~150KHz≤-36dBm@1KHz
150KHz~30MHz≤-36dBm@10KHz
30MHz~1GHz≤-36dBm@100KHz
1GHz~12.75GHz≤-30dBm@1MHz
Special Band Spurious Emission of active(passive) branch880 - 915 MHz/100 kHz ≤-61 dBm
930 - 960 MHz/100 kHz ≤-57 dBm
1710 - 1785 MHz/100 kHz ≤-61 dBm
1805 - 1880 MHz/100 kHz ≤-47 dBm
1880 - 1920MHz/1MHz ≤-52 dBm
1920 - 1980 MHz/1MHz ≤-49 dBm
2010 - 2025 MHz/1MHz ≤-52 dBm
2500 - 2570 MHz/1MHz ≤-49 dBm
2570 - 2620 MHz/1MHz ≤-52 dBm
Insertion loss of passive branch890-960MHz1710-1885MHz1880-1920MHz2010-2025MHz2320-2370MHz
≤4.0dB≤3.5dB≤3.5dB≤3.5dB≤3.5dB
Ripple of passive branch890-960MHz1710-1885MHz1880-1920MHz2010-2025MHz2320-2370MHz
≤2.5dB≤2dB≤2dB≤2dB≤2dB
VSWR≤1.8
Power ConsumptionActive combiner:≤40W; Active antenna:≤8W(When the nominal max output power of the downlink is ≤15dBm)。
Monitoring FunctionActive combiner:
*Power off *Power failure *Battery of monitoring module * Location alarm
*Alarm about the master- slave monitoring link *Downlink output over power *Downlink Output underpower *Downlink VSWR alarm *Loosing lock of LO
*Dyssynchrony alarm *RF signal switch
*Downlink *ALC ALC switch *Opening station report Active antenna:
*RF circuit failure alarm *Downlink output underpower


TD-LTE Active Antenna System--System Electrical Specification

No.ItemsDescription
1RF connectionN-type connector
2RF interface impedance50 Ω
3Supply voltageActive combiner: 220VAC(160~280VAC)or -48 VDC(-36~-60VDC) Coaxial remote feeder unit: 220VAC (160~280VAC)or 280VDC (240~380VDC)or-48VDC (-36~ -60VDC) Active antenna: 6-36VDC。
4Cooling formNatural cooling
5Technical requirements for outer surface of the equipmentThe surface of the equipment and the mounting bracket can not cause strong light reflection; The outer surface of all screws must be made of stainless steel
6Installation featuresActive combiner: wall mounting Coaxial remote feeder unit: wall mounting Active antenna: suspended ceiling type or other types Overcurrent combiner, overcurrent coupler, electric appliance and feeder: wall mounting or binding
7ReliabilityMTBF≥100000 hours


Environmental requirements for TD-LTE active antenna system

No.ItemsDescription
1Temperature rangeTemperature -5℃~+45℃
2Humidity5%RH~95%RH
3Air pressure70~106Kpa
Monitoring Function Active combiner: wall mounting Coaxial remote feeder unit: wall mounting Active antenna: suspended ceiling type or other types Overcurrent combiner, overcurrent coupler, electric appliance and feeder: wall mounting or bindingTechnical requirements for outer surface of the equipmentAir pressureNatural coolingNatural cooling
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