User's Manual
Table Of Contents
- 1 Preface
- 2 Overview
- 3 Features
- 3.1 Main Features
- 3.2 Adaptive Coding and Modulation (ACM)
- 3.3 Transmit Power Control (TPC)
- 3.4 2x2 Multiple-input and Multiple-output (2x2 MIMO)
- 3.5 Dynamic Frequency Selection (DFS)
- 3.6 Dynamic Channel Selection (DCS)
- 3.7 Retransmission
- 3.8 Configurable Uplink/Downlink Ratio
- 3.9 Quality of Service (QoS)
- 3.10 Power over Ethernet
- 3.11 Synchronization
- 3.12 Co-site Synchronization
- 3.13 OFDM Modulation
- 3.14 Low-density Parity Check (LDPC) Encoding
- 3.15 LLDP
- 3.16 Radio Port Performance Monitoring
- 3.17 Adaptive Noise Immunity (ANI)
- 4 Mechanical Structure and Interfaces
- 5 Product Structure
- 6 Management
- 7 Technical Specification
- 8 Standards
16
DragonWave Inc.Features
Lite measures the receiving signal quality by calculating the receiving EVM at any time.
ACM allows the system to choose the best modulation in order to overcome fading and
other interference.
The algorithm uses the highest possible modulation in accordance with link quality deg-
radation.
The switch between modulation depends on the receiving signal quality.
For example, on a clear day, using 64 QAM modulation, the transmit and receive data
capacity can be 120 Mbit/s. When the weather becomes overcast and stormy, the ACM
algorithm changes the modulation to 32 QAM and the system transmits at 100 Mbit/s.
Switchover has the ability to step up or down through all the modulation schemes
between BPSK and 64 QAM. This guarantees that the link will operate at the highest
possible modulation scheme at any time.
3.3 Transmit Power Control (TPC)
TPC controls the far-end transmit power level in order to keep the received signal level
above a certain user-defined threshold, in accordance with the particular modulation
method and capacity being used.
TPC allows traffic to transmit at a low power level while enough SNR is maintained. It is
a green design which reduces the interference to other system and power consumption.
Figure 6 TPC Design
User can define target power for the local site and Lite will measure the difference
between the RSSI and target power, and feedback to remote site so that the remote site
can adjust the transmit power accordingly.
TPC feature provides the customer with more flexibility in network design.
3.4 2x2 Multiple-input and Multiple-output (2x2 MIMO)
In radio, MIMO is the use of multiple antennas at both the transmitter and receiver to
improve communication performance. It is one of several forms of smart antenna tech-
nology.
MIMO technology offers significant increases in data throughput without additional
bandwidth. It achieves this goal by spreading the same total transmit power over the
antennas to achieve an array gain that improves the spectral efficiency (more bits per
second per hertz of bandwidth) or to achieve a diversity gain ghat improves the link reli-
ability.
By using a dual polarized (cross polarization) antenna, Lite supports 2x2 MIMO with a
single antenna.