LTE Active MIMO Distribution System-Amplitec Corporation

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.	Items	Description
1	MIMO function	Support multiple input multiple output processing of TD-LTE signal
2	Multi-network	The system accesses 22 (or NN) 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
3	Signal access	According 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
4	MIMO Power control	Monitoring the power of two channels(orNchannels) TD- LTE signal and automatically balancing amplitude difference within 3dB
5	Monitoring Function	With 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

Items		Specifications
Frequency Range of active branch		2320～2370MHz
Max Output Power of active branch		Downlink: 13±2dB Uplink: ≥-20dBm
Max Gain of active branch		Downlink: 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 Error		When 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 branch		EVM≤5%
Frequency Error of active branch		≤±5×10-8
Spurious Emission of active(passive) branch	9KHz～150KHz	≤-36dBm@1KHz
	150KHz～30MHz	≤-36dBm@10KHz
	30MHz～1GHz	≤-36dBm@100KHz
	1GHz～12.75GHz	≤-30dBm@1MHz
Special Band Spurious Emission of active(passive) branch		880 - 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 branch		890-960MHz	1710-1885MHz	1880-1920MHz		2010-2025MHz	2320-2370MHz
Insertion loss of passive branch		≤4.0dB	≤3.5dB	≤3.5dB		≤3.5dB	≤3.5dB
Ripple of passive branch		890-960MHz	1710-1885MHz	1880-1920MHz		2010-2025MHz	2320-2370MHz
Ripple of passive branch		≤2.5dB	≤2dB	≤2dB		≤2dB	≤2dB
VSWR		≤1.8
Power Consumption		Active combiner:≤40W； Active antenna:≤8W（When the nominal max output power of the downlink is ≤15dBm）
Monitoring Function		Active 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.	Items	Description
1	RF connection	N-type connector
2	RF interface impedance	50 Ω
3	Supply voltage	Active 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。
4	Cooling form	Natural cooling
5	Technical requirements for outer surface of the equipment	The 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
6	Installation features	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 binding
7	Reliability	MTBF≥100000 hours

Environmental requirements for TD-LTE active antenna system

No.	Items	Description
1	Temperature range	Temperature -5℃～+45℃
2	Humidity	5％RH～95％RH
3	Air pressure	70～106Kpa

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 binding

Technical requirements for outer surface of the equipment

Air pressure

Natural cooling

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