MSc Project List for 2004/5 from Prof. Barry G Evans

Transcription

1 MSc Project List for 2004/5 from Prof. Barry G Evans B.Evans@surrey.ac.uk No Project Title RA cosupervision Rm No. 1 Robust mobile satellite systems physical link (ACM & ARQ) K.Narenthiran U40 K.Narenthiran@surrey.ac.uk design and performance evaluation 2 OFDM performance on mobile broadcast/multicast S-DMB K.Narenthiran U40 K.Narenthiran@surrey.ac.uk channel 3 Performance evaluation of satellite based aeronautical K.Narenthiran U40 K.Narenthiran@surrey.ac.uk communication system 4 Evaluation of multiparty conferencing in satellite-umts Victor Kueh U6 V.Kueh@surrey.ac.uk 5 Investigation of packet scheduling schemes for satellite digital Victor Kueh U6 V.Kueh@surrey.ac.uk multimedia broadcast 6 Open loop Tx diversity schemes for more than 2 antennas for Atta Quddus U42 A.Quddus@surrey.ac.uk UMTS downlink 7 Multipath and common channel interference cancellation in Atta Quddus U42 A.Quddus@surrey.ac.uk UMTS downlink 8 Body Area Networks Barry Evans E18 B.Evans@surrey.ac.uk 9 SDMB-RAKE Receivers Atta Quddus U42 A.Quddus@surrey.ac.uk 10 Low Density Parity Check Codes Stelios E21 S.Papaharalabos@surrey.ac.uk 11 Investigation of the impact of Carousel-FEC in satellite digital Papaharalabos Linghang Fan U6 L.Fan@surrey.ac.uk 12 Simulation tool for broadband satellite transponder capacity Paul Thompson E11 P.Thompson@surrey.ac.uk

2 No.1: Robust mobile satellite systems physical link (ACM & ARQ) design and performance evaluation Direct satellite IMR replica Signal strength Direct satellite IMR1 IMR2 IMR Ref IMR3 IMR4 IMR5 IMR6 Multipath arrival with time IMR2 IMR3 Urban area IMR1 IMR Ref IMR4 IMR5 IMR6 Outside Urban area Movement of Terminal Power (db) Multipath propagation in IMR environment Power Delay Profile Norm. Dist.=0.86 Lat=51 North Power Delay Profile Norm.Dist.=0.86 Lat=51 North Sat Ref IMR IMR1 IMR2 IMR3 IMR4 IMR5 IMR T c

3 No.1: Robust mobile satellite systems physical link (ACM & ARQ) design and performance evaluation Objective: To evaluate the performance of the ACM & ARQ techniques under satellite propagation environment. Software tool: C/C+ Basic requirements from students: Basic knowledge in coding and modulation in wireless NW (mod. and coding module) Retransmission techniques (ACK-based-ARQ, NACK-based, Hybrid) Basic knowledge in satellite channel propagation aspects (Mobile and SAT coms. modules) Reasonable programming skills in C/C++ Main tasks: Understanding the concept of ACM & ARQ and its importance in 3G packet data transfer Understanding the satellite channel propagation aspects and the channel simulation models Understand the the available link level simulator, modify according to different ACM & ARQ schemes and evaluate the performance under different satellite channel conditions

4 No.2: OFDM performance on mobile broadcast/multicast S-DMB channel Objective: Investigating the performance of the OFDM in S-DMB environment (Sat+IMR) and comparison with WCDMA to see the capacity enhancement (Specifically impact of the guard time and the payload nonlinearity). Software tool: C/C+ Basic requirements from students: Basic knowledge in coding and modulation in wireless NW (mod. and coding module) Basic knowledge in satellite channel propagation aspects (Mobile and SAT coms. modules) Reasonable programming skills in C/C++ Main tasks: Understanding the concept of OFDM and its features particularly in high data rate wireless NW. Understanding the IMR channel propagation aspects and the channel simulation models Integrate the coding module to the available OFDM link level simulator and evaluate the performance Modify the available OFDM Link level simulator accommodate different guard interval and evaluate the performance

5 No.3: Performance evaluation of satellite based aeronautical communication

6 No.3: Performance evaluation of satellite based aeronautical communication Simulation Start (GUI optional) 1. Situate Satellites 2. Define Beams 3. Trace Aircrafts 4. Define Active Set 5. Traffic Generation 6. Scheduling 7. Channel Effect 8. Measure Distances between A/C and S/L 9. Define FSL and other losses 10. Add fast fading 11. Link Gain Matrix 12. Handover 13. Error Detection Select initial transmit 14. Power Control Power Control Stabilisation Transmit Signal Calculate Received Signal Compare SIR with Target Send Command SIR balancing loop 15. Calculate QoS measures 16. Apply Mobility Model Main Simulator loop

7 No.3: Performance evaluation of satellite based aeronautical communication Objective: Capacity dimensioning and system level performance evaluation of aeronautical system Software tool: C/C++ and MATLAB Basic requirements from students: Knowledge about different satellite and terrestrial mobile communications systems and their services Overall understanding on satellite and terrestrial system architectures and their components General idea about radio resource management and telecommunication traffic aspects Reasonable programming skill in C/C++ and MATLAB Main tasks: Understand the aeronautical communication and related issues Understand the radio resource management issues related to CDMA system Understand the traffic and mobility modeling Understanding system level simulation model and its individual modules. Derive reasonable traffic modeling for the aeronautical communication systems and evaluate the performance to see how many number of air-craft can be supported with the required QoS

8 MSc Project Time Plan

9 No.4: Evaluation of Multiparty Conferencing over Satellite UMTS Motivation UMTS to deliver multimedia sessions including multiparty conferencing based on the Session Initiation Protocol (SIP) S- UMTS a promising alternative for the provision of these types of services Objectives Literature survey of previous work on multiparty conferencing within UMTS and satellite framework Investigate the effect of the different Radio Link Control (RLC)/ Medium Access Control (MAC) parameters on the conference signalling performance (to be implemented on the existing ns-2 simulator) Perform evaluation over S-UMTS radio interface for different scenarios/configurations (for e.g. user calling into a conference, user getting invited into a conference)

10 No.4: Evaluation of Multiparty Conferencing over Satellite UMTS Requirement Have some background on IP & Internetworking - Session Initiation Protocol (SIP) Mobile Communications (UMTS and satellite) Programming knowledge C ++ (compulsory) and ns2 (preferably)

11 No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast Motivation Delivery of multimedia broadcast and multicast services to mobile users via satellite has become a major research/business topic in recent years Packet scheduling plays an important role as part of the radio resource management strategy to satisfy the QoS requirements of different multiplexed services Objectives Literature review of existing work on packet scheduling within the W-CDMA UMTS context Investigating methods for the Transport Format Combination Set (TFCS) derivation Design efficient packet scheduling scheme(s) considering availability of channel state information (CSI) Perform comparison with scheme(s) without CSI

12 No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast MBMS service 1 MBMS service 2 MBMS service 3 MBMS service 4 MBMS service 5 Logical Channels MTCH 1 MTCH 2 MCCH MTCH 3 MTCH 4 MTCH 5 MAC Logical channel multiplexing Logical channel multiplexing Transport Channels PHY FACH 1 FACH 2 FACH 3 Transport channel multiplexing Physical Channels S -CCPCH 1 S -CCPCH 2 Requirement Have good background on Mobile Communications (UMTS and satellite) Mathematics Programming knowledge C ++ (compulsory) and ns2 (preferably)

13 No.5: Investigation of Packet Scheduling Schemes for Satellite Digital Multimedia Broadcast Satellite distribution link in IMT2000 mobile satellite band 3G handset 3G Air interface Terrestrial Repeater for dense urban area coverage Hub based on 3G equipment + Interactive link in IMT2000 mobile terrestrial band 3G Mobile Network Content Network Content providers Local storage 3G Base station MBMS Broadcast/Multicast Service Centre

14 No.6: Open loop Tx diversity schemes for more than 2 antennas for UMTS downlink Introduction: Transmit Diversity is one of the key contributing technologies in WCDMA 3G systems in which space time codes are used to introduce joint correlation in both space and time domains. In the current 3GPP standard, diversity schemes for 2 Tx. Antennas have been defined. It is being discussed at the moment to increase the number of Transmit Antenna from 2 to 4, targeting Release 6 and various possible diversity schemes are being investigated. S 1 S 2 Ant 1 Path 1 Mobile Antenna S 1 S 2 STTD encoder T 2T -S 2 * S 1 * 0 T 2T Ant 2 Path j N data

15 No.6: Open loop Tx diversity schemes for more than 2 antennas for UMTS downlink Objective of the Project: The objective is to understand, implement and verify the open loop transmit diversity schemes for 2 antennas, first and then investigate the possible schemes for 4 antennas. Issues: Backward Compatibility Performance Complexity Requirements: Knowledge of C++, Matlab, Signal Processing

16 No.7: Multipath and Common Channel Interference Cancellation in UMTS Downlink: Introduction: Due to multipath propagation, the orthogonality of the spreading codes is destroyed to some extent even though perfectly orthogonal codes are used in UMTS downlink. Thus the performance of a Rake receiver suffers due to inter-path interference. One approach is to cancel this interference in a parallel multi-stage manner.

17 No.7: Multipath and Common Channel Interference Cancellation in UMTS Downlink: Objective of the Project: The objective is to understand and implement various multipath interference cancellation techniques in a simplified UMTS link level simulator. Issues: Interf. generation after Rake combining vs. after channel decoding Multicode Transmission S-DMB Environment with lots of multipaths Requirements: Knowledge of Matlab, Channel Modelling, UMTS

18 No.8: Body area networks

19 No.9: S-DMB Rake Receiver Architectures Introduction: Due to multipath propagation, the orthogonality of the spreading codes is destroyed to some extent even though perfectly orthogonal codes are used in UMTS downlink. Thus the performance of a Rake receiver suffers due to inter-path interference.

20 No.9: S-DMB Rake Receiver Architectures Objective of the Project: The objective is to understand and implement a generalized Rake receiver (G-Rake) for multipath interference suppression in S-DMB multipath environment. Issues: Pulse shape filtering and over-sampling Finger placement Appropriate Weights Requirements: Knowledge of Matlab, Digital Communications

21 No.10: LDPC codes Background LDPC codes are block codes Proposed by Gallager in 1962 Rediscovered by MacKay and Neal in 1996 Very sparse parity check matrix Iterative decoding by the sum-product algorithm Achieve near Shannon limit performance large block sizes, Binary Symmetric, Binary Erasure and AWGN channel Recently adopted by the DVB-S2 standard (2004) Current work in 3GPP MBMS R6 (Packet Level FEC)

22 Projects Description and Basic Requirements Project 1 Digital Modulation and Coding for DVB-S2 Standard No.10: LDPC codes Project 2 Efficient Coding and Decoding for LDPC Codes Knowledge of digital communications theory (encoding/decoding techniques, turbo codes) Block codes, iterative decoding, log-likelihood algebra Good C programming skills

23 No.10: LDPC codes Project 1 Objectives Digital Modulation Schemes (QPSK, 8-PSK, 16 and 32-APSK) Non-linear HPA effects (back-off, predistorsion techniques) Implementation of LDPC + BCH encoder for very low BER Sum-product algorithm decoding Project 2 Objectives Random parity check matrix generation (MacKay codes, irregular LDPC codes) Linear-time encoding (array codes, finite geometry codes) Sum-product/min-sum algorithm decoding Efficient decoding implementations Reduced complexity algorithms, serial/parallel architectures, high speed decoding

24 No.10: LDPC codes Projects Interaction and Integration Sum-product algorithm Project 1 DVB-S2 LDPC encoder Project 2 Low complexity decoding algorithms Low complexity decoding algorithms suitable for DVB-S2 LDPC codes

25 No.10: LDPC codes References W. E. Ryan, An introduction to LDPC codes, CRC Handbook for Coding and Signal Processing for Recording Systems W. E. Ryan, Concatenated codes and iterative decoding, Wiley Encyclopaedia of Telecommunications A. Shokrollahi, An introduction to LDPC codes, Digital Fountain Inc., White Paper X.-H. Hu et al, Efficient implementations of the sumproduct algorithm for decoding LDPC codes, IEEE Globecom 2001 (IBM Research, Zurich)

26 No.11: Investigation of the impact of Carousel-FEC in Satellite Digital Multimedia Broadcast Systems Research Problem One of the key parameters in data carousel is response time The lower bound for response time has been studied, and the impact of transmission errors is on this lower bound is also assessed. However, the analysis and simulations do not take packet-level FEC into account. FEC can bring down the response time in the presence of errors.

27 No.11: Investigation of the impact of Carousel-FEC in Satellite Digital Multimedia Broadcast Systems Objectives The trade-off performance between the reduced response time in the presence of errors and the increase in size of items when FEC is applied. The right balance has to be found between the original packets and parity packets according to different reception scenarios.

28 No.12: Simulation tool for broadband satellite transponder capacity modelling OBJECTIVE: To develop a simulator that can assess the capacity of a geostationary satellite transponder when loaded with a mix of broadband traffic having varying QoS and delay parameters. BACKGROUND The projected average session rates for the broadband traffic mix will be provided for a range of years into the future. Typical satellite and earth station data will also be provided. The modelling should be conducted on a session basis using a software language chosen by the student. Oct 2004 MSc Project P T Thompson 28

29 No.12: Simulation tool for broadband satellite transponder capacity modelling ITU G1010 performance targets (delay and packet loss ratio) should be used in the simulation. The student will need to develop a suitable method of presenting the simulation results in a meaningful manner. A generic simulation tool should be developed (most likely based on queuing theory and suitable statistical models of the traffic flow). Contact details: Dr Paul Thompson, E11 BA Tel extn p.thompson@surrey.ac.uk