TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 35 of 158
1.7
Antenna interface
1.7.1
Antenna RF interfaces (ANT1 / ANT2)
TOBY-L2 and MPCI-L2 series modules provide two RF interfaces for connecting the external antennas:
The
ANT1
represents the primary RF input/output for transmission and reception of LTE/3G/2G RF signals.
The
ANT1
pin of TOBY-L2 series modules has a nominal characteristic impedance of 50
and must be
connected to the primary Tx / Rx antenna through a 50
transmission line to allow proper RF transmission
and reception.
The
ANT1
Hirose U.FL-R-SMT coaxial connector receptacle of MPCI-L2 series modules has a nominal
characteristic impedance of 50
and must be connected to the primary Tx / Rx antenna through a mated RF
plug with a 50
coaxial cable assembly to allow proper RF transmission and reception.
The
ANT2
represents the secondary RF input for the reception of the LTE RF signals for the Down-Link
MIMO 2 x 2 radio technology supported by TOBY-L2 and MPCI-L2 series modules as required feature for LTE
category 4 UEs, and for the reception of the 3G RF signals for the Down-Link Rx diversity radio technology
supported by TOBY-L2 and MPCI-L2 series modules as additional feature for 3G DC-HSDPA category 24 UEs.
The
ANT2
pin of TOBY-L2 series modules has a nominal characteristic impedance of 50
and must be
connected to the secondary Rx antenna through a 50
transmission line to allow proper RF reception.
The
ANT2
Hirose U.FL-R-SMT coaxial connector receptacle of MPCI-L2 series modules has a nominal
characteristic impedance of 50
and must be connected to the secondary Rx antenna through a mated RF
plug with a 50
coaxial cable assembly to allow proper RF reception.
The Multiple Input Multiple Output (MIMO) radio technology is an essential component of LTE radio systems
based on the use of multiple antennas at both the transmitter and receiver sides to improve communication
performance and achieve highest possible bit rate. A MIMO m x n system consists of m transmit and n receive
antennas, where the data to be transmitted is divided into m independent data streams. Note that the terms
Input and Output refer to the radio channel carrying the signal, not to the devices having antennas, so that in
the Down-Link MIMO 2 x 2 system supported by TOBY-L2 and MPCI-L2 series modules:
The LTE data stream is divided into 2 independent streams by the Tx-antennas of the base station
The cellular modules, at the receiver side, receives both LTE data streams by 2 Rx-antennas (
ANT1
/
ANT2
)
Base Station
Tx-1
Antenna
Tx-2
Antenna
TOBY-L2 series
MPCI-L2 series
ANT1
Rx-1
Antenna
ANT2
Rx-2
Antenna
Data Stream 1
Data Stream 2
Figure 18: Description of the LTE Down-Link MIMO 2 x 2 radio technology supported by TOBY-L2 and MPCI-L2 series modules
TOBY-L2 and MPCI-L2 series modules support the LTE MIMO 2 x 2 radio technology in the Down-Link path only
(from the base station to the module): the
ANT1
port is the only one RF interface that is used by the module to
transmit the RF signal in the Up-Link path (from the module to the base station).
