The document summarizes the research and development work on LTE being done at the Galician Research and Development Center for Advanced Telecommunications. The center has expertise in LTE physical layer design, prototyping of RF subsystems, and testing of quality and performance parameters. It has hardware and software tools for LTE protocol stack development and participated in early LTE field trials. The center also organizes workshops and lectures on topics like emergency communications and LTE positioning.

1. Research in LTE
March 2013
Contact: Jorge Munir <jmunir@gradiant.org>
GALICIAN RESEARCH AND DEVELOPMENT CENTER IN ADVANCED TELECOMMUNICATIONS

2. LTE in Gradiant: an Overview
Key technologies
LTE Physical Layer (Release 8 and beyond).
Quality and performance system parameters.
Prototyping of RF subsystems
HW and SW Resources
Agilent SW and HW tools for generating and analyzing LTE frames.
Agilent SW tools for simulating and validating PHY & MAC layer designs.
SW & HW Small Cell LTE Release 8 and 9 (R&D License of MimoOn)
Algorithms for downlink LTE Frame transmission and reception.
Project participation
National projects.
Under contract.
Organization of events
The Satellite Role in the Mobile Communications Arena, Vigo, June 2012
Workshop in Emergency Communications, Vigo, January 2012.
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA

3. Expertise in LTE
Design and implementation of digital communications algorithms
for LTE UE Receivers.
• Quality and performance parameters for testing.
Gradiant has participated in first LTE Field Trials in Galicia
• June 2012: R (Regional carrier).
• October 2012: Telefonica (National carrier) – Alcatel-Lucent (Provider).
Coexistence between LTE and DVB-T
Matlab Release 8 LTE Frame Generator (limited features).
Generation & Measurement equipment
Antena ports
Procesamiento Base
Layer
Demapper
Mode Detection
Frequency Offset Windowing/CP Channel
(normal/extended) FFT RB demapper
Compensator Removal Equalization
*Non-blind detection* MIMO Detector
Other CW
PSS
Downsampling
Processing
filter RS Extraction
& Detection
Channel
Estimation
Fractional CFO
Estimator
TDD/FDD Mode
SSS Detection
detector
+
Mode Detection
(normal/extended)
*Blind detection*
Integer CFO Cell-ID Extraction
Estimator & Verification
Soft demodulator 8
CB Concatenation
HARQ Support & Rate
CB segmentation:
Turbo decoder
transition from
OFDM wise to
Descrambling
Matching:
processing
CB CRC
TB CRC
CB-wise
HARQ soft buffer for
bit
S1, P1, P2.
Subblock interleaver.
Soft-Combiner 8 bit,
RVs.
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA

4. Analog Design and Prototyping
RF prototype development.
PCB design and prototyping.
Development of RF circuits (LNA, VCOs, PLLs, DDSs, Mixers, Filters, etc).
Analog-Digital interfaces.
Signal conditioning.
Location and correction of EMI problems.
Design, implementation and characterization of antennas.
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA

5. HW and SW Resources
Hardware
• Equipment
• Agilent PXA9030 Signal Analyzer (BW up to 40MHz).
• Agilent E4438C ESG Vector SignalGenerator.
• Packets: LTE-FDD, LTE-TDD, WiMAX Mobile.
• HW Platforms for LTE MIMO
• Azcom platform (Turbo Nyquist DSP).
• Advantech platform (Appleton DSP)
• RF Frontend for LTE band 1 (TSW3725EVM)
Software
• Tools
• Agilent Signal Studio for Signal Creation
• Packets: LTE Release 8, 9 and 10 (FDD and TDD), WiMAX Mobile.
• Agilent 89600B VSA for Software Measurement Acquisition.
• Agilent 89600 WLA (MAC layer complement to VSA).
• Agilent SystemVue
• Packets: LTE and LTE-A Verification, MIMO, DPD (Digital Pre-Distorsion), EQ, C++
• IP Blocks
• LTE Release 8 & 9 eNB
• Physical Layer, Stack and Scheduler
(provider: MimoOn (Germany)).
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA

6. Project Cases
Participation in first LTE Field Trials in Galicia (Spain)
WIMOVE: Equipment for Mobile Wireless Technology
• Under contract, 2010-2012
CORAGE: Cognitive Radio Generation
• Spanish consortium, public funding, 2009-2010
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA

7. Organization of Events
Regular lectures by prominent visitors:
Laurent Franck (Telecom Bretagne), “Emergency
Communications”, January 2012
Gonzalo Seco (Universidad Autonoma de Barcelona),
“Evaluation of LTE positioning capabilities”, April 2012.
Markus Rupp (Vienna University of Technology), “The
Performance of 3G and 4G Cellular Systems”, September 2012.
CENTRO TECNOLÓXICO DE TELECOMUNICACIÓNS DE GALICIA