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Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 1© 2016 The MathWorks, Inc.
Novel Satellite Random Access E-SSA Receiver with
SIC – Simulation and Prototyping
Josep Vilà
Head of the Digital Signal Processing Group
Satellite Communications Unit
Indra Sistemas
30th May 2018
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 2
Key Takeaways
1. Time-consuming algorithms progamming tasks reduced to the minimum
– Focussing on the Innovative Algorithms Design and Evaluation
– Minimising Design Phase
2. Same system models used for
– Algorithms Detailed Design
– Performance Analysis
– Assisting Prototyping and Verification
3. MATLAB used in all project phases (not only during the design phase)
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 3
Introduction to Organization and Business (I)
Projects in
+140 countries
Complete offering for
all industries
R&D 6-8% of sales
+200 deals with research centres
and universities
Leading clients
in key geographies and
industries
39,000 employees€ 2.9 Bn
Sales
16%Energy and
Industry
16% Financial Services
17% Public
Administration
and Healthcare
12% Telecommunications
& Media
23% Transport & Traffic
16%Security & Defense
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 4
Introduction to Organization and Business (II)
▪ Space division is part of the defense & security market
▪ Satellite communications is one of the business unit
within space division focused on:
▪Engineering and technical consultancy on satellite
communications systems
▪Satellite systems simulation and emulation, from physical to
network layer, in house simulation/emulation tools
▪Design, development and manufacturing of satellite
communication equipment
▪Specification, design, integration and deployment of satellite
communication networks, fixed and mobile
▪ Broad experience in SatCom projects for different
customers worldwide, such as ESA, civil administration
or military
DAMA Ctrl
DVB-S/S2
DVB-RCS
Terminal 1
DVB-RCS
Terminal N
“Internet”
“Satellite”
“Satellite”
“DVB-RCS”
AINE
IMBU – TT&C
QoS Enforcer
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 5
Innovation Challenges and Achievements (I)
▪ The European Space Agency
(ESA), in coordination with
Eurocontrol, initiated the Iris
programme to design a
satellite-based communication
system able to cope with
future Air Traffic Control (ATC)
communication needs
▪ Work carried out in the frame
of the ESA Iris ANTARES
project – consortium of more
than 15 participants
Multi-beam Satellite
NCC
Fixed Link
Mobile Link
NMC
WAN
Ku
L
Regional beams
Global beam
GES 2
ATN/OSI – ATN/IPS
AOCANSP
ANSP
AES
GES 1
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 6
Innovation Challenges and Achievements (II)
▪ A key design decision was the selection of the Return Link multiple access
scheme which, finally, was based on Asynchronous-CDMA Random
Access.
▪ On the ground segment, a novel receiver (E-SSA), using state-of-the-art
interference cancellation techniques, was used to improve the overall return
link spectrum efficiency.
▪ MATLAB was the key tool used in the simulation, prototyping and
verification of the innovative E-SSA receiver.
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 7
Approach
▪ Approach to prototyping the access schemes and, in particular, the ground
segment receiver:
– Trade-off of several multiple access schemes and selection of the most appropriate one
– Design of the access scheme, involving extensive simulation campaign
– Prototyping of key elements, being the most critical one the ground segment receiver
– Verification of the performances in a Test Bed
OUE(Onboard User
Terminal Emulator)
ONE(Onboard Network
Emulator)
LCE(Logical Channel
Emulator)
GSE(Ground Segment
Emulator)
ATM Network
Emulator
APE (ground)(Application
Emulator)
APE (aircraft)(Application
Emulator)
UTP(User Terminal
Prototype)
PCE(Physical Channel
Emulator)
GES Prototype(Ground Earth Station
Prototype)
SLE(System Load
Emulator)
Logical VTB
Physical VTB
GroundAircraft Satellite
Test Manager &
Test Controller
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 8
Design Constraints
▪ The Return Link multiple access scheme, the waveform and the receiver
was designed taking into account the following constraints:
– Stringent Class-of-Service requirements (continuity, integrity and latency)
– L-band aeronautical propagation channel
▪ Multipath, Doppler, etc.
– Limited L-band spectrum resources
▪ High system spectral efficiency required
– Bursty traffic generated by a large population of aircrafts
– Support for fixed and rotary-wing aircrafts
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 9
Asynchronous CDMA for the Return Link
▪ Random Access scheme based on Asynchronous Code Division
Multiple Access (A-CDMA)
– Several transmitters send information simultaneously over a single communication
channel taking advantage of Spread Spectrum techniques
– No need for network synchronisation Simple transmitter (low-cost)
▪ Enhanced Spread Spectrum ALOHA (E-SSA) receiver
– Combination of Spread Spectrum ALOHA (SSA) with Successive Interference
Cancellation (SIC)
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 10
E-SSA Receiver with SIC
▪ It provides exceptional performances in
scenarios with many transmitters
sending asynchronous bursty traffic
▪ The receiver iteratively detects,
demodulates, decodes, regenerates
and cancels bursts from the received
signal, starting with those with highest
power
▪ Robust to power unbalance
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 11
0 20 40 60 80 100 120 140 160 180 2000
20406080
100120140160180200
SIC performances - SF=16, DW=512, Nmax
=3
Offered traffic (kbit/s)
Thro
ughput
(kbit/s
)
Ideal throughput
AERO-MIXED, ES/N
0=[16.5,1.53]dB
Measurement
0 20 40 60 80 100 120 140 160 180 20010
-4
10-3
10-2
10-1
100
Offered traffic (kbit/s)
Packet
Loss R
ate
Target PLR
AERO-MIXED, ES/N
0=[16.5,1.53]dB
Measurement
Performances of E-SSA Receiver
▪ SIC Efficiency of 95% even in
severe aeronautical channels
▪ Low Packet Loss Ratio even with
high throughputs
▪ Spectral efficiency above 1
bit/s/Hz
▪ Full frequency reuse is possible
improving the system efficiency
even further
▪ Performances reached with the
final test-bed (blue lines) matched
those from early project phases
simulations (red lines)
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 12
E-SSA Receiver Workflow
▪ Design Phase
– Receiver detailed design completed in very few
months thanks to new algorithms programming
with MATLAB
– MATLAB allowed us focusing on the innovative
algorithms design and evaluation
▪ Prototyping
– FPGA FW development was assisted by MATLAB
and Simulink + Xilinx System Generator
▪ Verification
– E-SSA receiver prototype verification and tested
assisted by MATLAB tools to generate input stimuli
and post-process receiver output
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 13
Simulation Models
▪ MATLAB has been used in all
project phases
▪ Many MATLAB modules reused in
each phase
▪ MEX files: C/C++ subroutines called
as if they were built-in functions
– Reuse existing C/C++ code
– Used to validate VHDL coding of
critical receiver modules during
Prototyping
▪ Simulink + Xilinx System Generator
also used to speed up development
of some receiver modules
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 14
MathWorks Tools
▪ MATLAB toolboxes used in all project phases
– Communications System Toolbox
– DSP System Toolbox
– Signal Processing Toolbox
– Fixed-Point Designer
– MATLAB Compiler
▪ Simulink + Xilinx System Generator used for Prototyping
– Development and debugging of key receiver modules
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 15
Identified Best Practices and Learnings
▪ Reuse models as much as possible
– In all project phases
– Among different projects and teams
▪ Exhaustive simulation with in-depth performance analysis during the design
phase
– Speeds up prototyping and verification phases
– Minimizes risk of unexpected issues at later project stages
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 16
Forward-looking Plans (I)
▪ Incorporate Simulink during Project Design Phase
▪ More intensive usage of Simulink + Xilinx System Generator during
Prototyping (already put in practice in on-going projects)
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 17
Forward-looking Plans (II)
▪ Explore the advantages of using
– Parallel Computing Toolbox in projects requiring intensive simulations
– System Objects to speed up simulations that process large streams of data in
segments
– HDL Coder to generate VHDL or Verilog code for FPGA from MATLAB functions or
Simulink models
Novel Satellite Random Access E-SSA Receiver with SIC – Simulation and Prototyping | 18
Comité Comercial
Anta
ers
Air I
nte
rface –
Meetin
g w
ith
Inm
ars
at
–20/0
4/2
01
6
18
Josep VilàSatellite Communications Unit
Space Division
Indra Sistemas
C/ Roc Boronat 133
08018 Barcelona
www.indracompany.com
