User's Manual

MDS 05-6302A01, Rev. A MDS Mercury 16E Technical Manual 11
The Subscriber must be configured with X.509 certificates that are
appropriate for the Public Key Infrastructure (PKI) in which they are
deployed. These certificates are used to identify and authenticate the
Subscriber to the RADIUS sever.
X.509 Certificates
A digital certificate, often known as an X.509 certificate, is a file that
contains identification data and asymmetric key material. Each
certificate contains a Common Name that identifies the user or device
that owns the certificate. The primary information in the certificate is the
public key for the user or device and a digital signature proving the
authenticity of the certificate's contents.
The Mercury transceiver uses X.509 certificates in the EAP-TLS
handshake during device authentication as described in the PKMv2
section above.
3.2 Multiple In / Multiple Out (MIMO) Operation
MIMO stands for Multiple In / Multiple Out. The Mercury transceiver
features 2x2 MIMO on all models. This means that there are two full
transmit and receive channels on each device. The use of 2x2 MIMO
causes the Mercury transceiver to have higher throughput and greater
range and coverage than single channel devices in the same
environment.
There are two operating modes that the Mercury supports. The first
mode is Matrix A in which the Mercury uses Space-Time Coding (STC)
on the transmitter to allow it to send the same data on each channel but
coded differently in order to get transmit diversity. On the receive side,
the Mercury transceiver uses Maximum Ratio Combining (MRC) to
more accurately reconstruct the received signal by using both receive
channels.
The second mode is Matrix B in which the Mercury uses Spatial
Multiplexing (SM) to send different data flows on each channel
allowing it to effectively double the amount of data transmitted. The
Mercury offers a Matrix A/B setting in which the transceivers determine
in real time which mode, Matrix A or Matrix B, to use according to the
channel conditions. This determination is made based on the SNR and
Packet Error Rate (PER).
GE MDS sells antennas that are dual-polarized for MIMO applications.
This includes sector antennas for Base Stations and panel antennas for
Subscribers. Each antenna has two feed lines, one for the vertically
polarized element, and one for the horizontally polarized element.