Sangarapillai Lambotharan

 

Description:

 

Description: lambo.jpg

 

Dr Sangarapillai Lambotharan

BEng, PhD, DIC, PGCAP, MIET, SMIEEE

Reader in Communications

Phone: +44 (0)1509 227 033
Email: S.Lambotharan@lboro.ac.uk
Room: W1 22N

Description: Background

(Please also visit my personal website http://lambotharan.blogspot.com/ for more information)

BEng in Electrical and Electronic Engineering from City University, UK, 1994 and PhD in Digital Signal Processing from Imperial College, UK,1997. Postdoctoral research associate at Imperial College, UK (October 1997 to April 1999), visiting scientist at Cornell University, USA (August 1996 to December 1996), Lecturer in Communications and Signal Processing at Brunel University, UK (May 1999 to October 1999), Research Engineer at Motorola, UK (November 1999 – January 2002), Lecturer at King’s College London (February 2002 – July 2005) and Senior Lecturer at Cardiff University (August 2005 – August 2007).

Description: Professional Affiliations

Senior Member of the Institution of Electrical and Electronic Engineers (SMIEEE)
Member of the Institution of Engineering & Technology (MIET)

Description: External Activities

Associate Editor for EURASIP Journal on Wireless Communications and Networking and IET Signal Processing
Technical Programme Committee Member – IEEE ICC 2010, IEEE VTC2006 Spring and VTC 2007 Spring, VTC 2008 and VTC 2009 Spring. Signal Processing for Wireless Communications 2005
Organising Committee Member - London Communications Symposium, Sept 2003 and DSP 2007.
PhD Examiner: Imperial College, 2004 – 2005, University of Southampton 2007 and University of York, Nov. 2009.
Invited as a speaker for the Next Generation Wireless Net Workshop, Edinburgh, 2005, NGWNet Summer School in Wireless Technology, Edinburgh, 2006, 2007, IEEE UKRI signal processing chapter seminar, 2006, IEE professional development course on adaptive signal processing, 2006

Description: Broad Interests and Expertise

Signal Processing for Wireless Communications
Statistical Estimation and Detection Techniques

Description: Research Interests and Activities

Cognitive Radio Networks
Transmitter and Receiver Diversity Techniques
Multiple-Input and Multiple-Output (MIMO) Systems
Relay Networks
Convex Optimization Techniques
Physical Layer Techniques for EGPRS, UTRAN and Broadband Wireless Communication Systems

Description: Research Grants

1) Dr S Lambotharan (PI), EPSRC GR/S16775 (£106,084.00) “Novel Signal Processing Techniques for Enhancing the Downlink Capacity of a Wireless Communication System” 2003-2005.

2) Dr S Lambotharan (PI) and Prof. J.A. Chambers (CI), EPSRC E041817 (FEC £344,286) “Advanced Transmit Diversity and Spatial Multiplexing Techniques for the Enhancement of Capacity and Coverage in Wireless Broadband Access Systems,” started in Oct. 2007.

3) Prof. J.A. Chambers (PI) and Dr S. Lambotharan (CI) (Loughborough Uni.) and Prof. J. McWhirter (PI) (Cardiff Uni.), FEC £445370  “Novel Polynomial Matrix Decompositions with Application to Broadband MIMO Communications Signal Processing,” started in June 2008.

4) Dr S Lambotharan (PI) and Prof. J.A. Chambers (CI), “Convex Optimization Based Robust Spatial Multiplexing Techniques for Downlink Multiuser Wireless Systems,” EPSRC G020442, FEC: £278,797, to start in Dec. 2008.

5) Prof. C. Cowan (PI), T. Ratnarajah (CI), Prof. J. McCanny (Network Mmember-NM), Prof. J.A. Chambers (NM), Dr S. Lambotharan (NM), Prof. D. Parish (NM), Prof. B. Mulgrew (NM), Dr J. Thompson (NM), Prof. A.G. Constantinides (NM) and Dr A Nallanathan (NM), EPSRC G033528 (FEC £120,00), “Building Links with India: Cognitive Wireless Systems for Universal Access,” to start in Dec. 2008.

6) Prof. J.A. Chambers (PI) and Dr S. Lambotharan (CI) (Loughborough Uni.) and Prof. J. Kittler (PI) and Dr. W. Wang (CI) (Surrey Uni.), “Audio and Video Based Speech Separation for Multiple Moving Sources Within a Room Environment,” EPSRC EP/H049665/1, to be started in June 2010.

 Description: Research Team

To be Updated Soon.

 

Description: Former PhD Students

1)  Cenk Toker, “Signal Processing Algorithms and Architectures for Communication Transceiver,” King’s College London, Oct. 2004.

2)  Lay Teen Ong, “Rate and Power Adaptation Techniques for Wireless Communication Systems,” Cardiff University, 2007.

3) Qiang Yu, “Frequency Synchronization Techniques in Wireless Communication,” Cardiff University, 2007.

4)  Muhammad Tariq N. Qaisrani, “Estimation and Detection Techniques for Doubly Selective Channels in Wireless Communications,” Loughborough University, Sept. 2008.

5)  Vimal Sharma, “Multiuser Spatial Diversity Techniques for Wireless Communication Systems,” Loughborough University, Oct. 2008.

6)  Ranaji Krishna, “Mathematical Optimization and Signal Processing Techniques in Wireless Relay Networks,” Loughborough University, Nov.. 2009.

7)  Kanapathippillai Cumanan: Spatial Diversity and Optimization Techniques for Cognitive Radio Networks,” Loughborough University, Nov.. 2009.

8)  Martin Davies, “Broadband Beamforming Techniques for Wireless Systems”, Loughborough University, March 2010.

9)  Amod J G Anandkumar, “Robust Game Theoretic Algorithms for Distributed  Resource Allocation in Wireless Communications,” July 2011.

10) Rahulamathavan Yogachandran, “Mathematical Optimization Techniques for Resource Allocation in Cognitive Radio Networks,” Oct. 2011.

 

 

Description: Former Research Associates

Dr Kanapathippillai Cumanan: Interference Cancellation Techniques for Cognitive Radios

Dr Leila Musavian: Information Theoretical Analysis for Spectrum Sharing Channels, Jan. 2009 – Jan 2011.

Dr Zhilan Xiong: Transmitter Diversity Techniques, Sept. 2007- April 2010.

Dr Cenk Toker: Joint MIMO Transceiver Design.

Dr Yuhui Luo: Transmitter Diversity Techniques.

 

Description: Former Academic Visitors

Dr Wie Wang (Harbin University, China), 2010.

 

Description: Publications

Book Chapter

1)         *C.R. Johnson, Jr., P. Schniter, I. Fijalkow, L. Tong, J.D. Behm, M.G. Larimore, D.R. Brown, R.A. Casas, T.J. Endres, S. Lambotharan, H.H. Zeng, A. Touzni, M. Green, and J.R. Treichler, “The Core of FSE-CMA Behaviour Theory,” Unsupervised Adaptive Filtering, S. Haykin, ed. (Wiley, 1999).

 

Magazine/Tutorials

2)         *Molkdar, W. Featherstone and S. Lambotharan, “Enhanced General Packet Radio Service (EGPRS), an Overview” IEE Electronics and Communication Magazine, vol. 14(1), pp. 21–38, Feb 2002.

3)         Z. Fan, P. Kulkarni, S. Gormus, C. Efthymiou, G. Kalogridis, M. Sooriyabandara, Z. Zhu, S. Lambotharan and W. Chin, “Smart Grid Communications: Overview of Research Challenges, Solutions, and Standardization Activities,” IEEE Communications Surveys & Tutorials, 2012.

 

Journals published/accepted in 2012

4)         Y. Rahulamathavan, S. Lambotharan, C. Toker and A. Gershman, “Suboptimal recursive optimisation framework for adaptive resource allocation in spectrum-sharing networks,” to appear in IET Signal Processing, 2012.

 

Journals published in 2011

5)         Y. Rahulamathavan, K. Cumanan and S. Lambotharan, “A Mixed SINR-Balancing and SINR-Target Constraints based Beamformer Design Technique for Spectrum Sharing Networks”, IEEE Trans. Vehicular Technology, vol. 60, no. 9, pp. 4403 – 4414, Nov. 2011.

6)         A.J.G, Anandkumar, A. Anandkumar, S. Lambotharan and J.A. Chambers, “Robust Rate Maximization Game Under Bounded Channel,” IEEE Trans. Vehicular Technology, vol. 60, no. 9, pp. 4471 – 4486, Nov. 2011.

7)         J. Tang and S. Lambotharan, “Beamforming and Temporal Power Optimization for an Overlay Cognitive Radio Relay Network,” IET Signal Processing, vol.5, no. 6, 2011.

8)         Z. Xiong, R. Krishna, K. Cumanan and S. Lambotharan, “Grassmannian Beamforming and Null Space Broadcasting Protocols for Cognitive Radio Networks,” IET Signal Processing, vol. 5, pp. 451-460, Sept. 2011.

9)         J. Tang, K. Cumanan and S. Lambotharan, “Sum Rate Maximization Technique for Spectrum Sharing MIMO OFDM Broadcast Channels,” IEEE Trans. Vehicular Technology, vol. 60, pp. 1960-64, May 2011.

10)      L. Musavian, S. Aïssa and S. Lambotharan, “Adaptive Modulation in Spectrum-Sharing Channels Under Delay Quality of Service Constraints,” IEEE Trans. Vehicular Technology, vol. 60, pp. 901-911, March 2011.

 

Journals published in 2010

11)      K. Cumanan, R. Krishna, L. Musavian and S. Lambotharan, “Joint Beamforming and User Maximization Techniques for Cognitive Radio Networks Based on Branch and Bound Method,” IEEE Trans. Wireless Communications, vol. 9, pp. 3082-92, Oct. 2010.

12)      L. Musavian, S. Aïssa and S. Lambotharan, “Effective Capacity for Interference and Delay Constrained Cognitive Radio Relay Channels”, IEEE Trans. Wireless Communications, vol. 9, pp. 1698-1707, May 2010.

13)      K. Cumanan, L. Musavian, S. Lambotharan and A. Gershman, “SINR Balancing Technique for Downlink Beamforming in Cognitive Radio Networks,” IEEE Signal Processing Letters, vol. 17,  pp. 133-136,  Feb. 2010.

14)      R. Krishna, K. Cumanan, Z. Xiong and S. Lambotharan, “A Novel Cooperative Relaying Strategy For Wireless Networks With Signal Quantization,” IEEE Trans. Vehicular Technology, Jan. 2010.

15)      K. Cumanan, R. Krishna, Z. Xiong and S. Lambotharan, “Multiuser Spatial Multiplexing Techniques with Constraints on Interference Temperature for Cognitive Radio Networks,” IET Signal Processing, vol.4, pp. 666-672, Dec. 2010.

 

Journals published in 2007-2008

16)      *R. Krishna, Z. Xiong and S. Lambotharan, “A Cooperative MMSE Relay Strategy for Wireless Sensor Networks,” IEEE Signal processing Letters, vol. 15, pp. 549-552, 2008.

17)      C. Toker, S. Lambotharan and J.A. Chambers, “Joint Transceiver Design for MIMO Channel Shortening,” IEEE Trans. Signal Processing, vol. 55, pp. 3851 – 3866, July 2007.

18)      Q. Yu and S. Lambotharan, “Iterative (Turbo) Estimation and Detection Techniques for Frequency Selective Channels with Multiple Frequency Offsets,” IEEE Signal Processing Letters, vol. 14, pp. 236 – 239, April 2007.

19)      Kobravi, M.R. Shikh Bahaei and S. Lambotharan, “Multi-User Interference Cancellation Technology in the Presence of Multiple Frequency Offsets,” IET Communications, vol. 1, pp. 7-14, Feb. 2007.

 

Journals published in 2005-2006

20)      Jakobsson, S. Alty and S. Lambotharan, “On the Implementation of Linearly Constrained Minimum Variance Beamformer,” IEEE Trans. Circuit and Systems, Part II, vol. 53, pp. 1059 – 1062, Oct. 2006.

21)      Y. Luo, W. Wang, J.A. Chambers, S. Lambotharan and I. Proudler, “Exploitation of Source Non-Stationarity in Underdetermined Blind Source Separation with Advanced Clustering Techniques,” IEEE Trans. Signal Processing, vol. 54, pp. 2198 – 2212, June 2006.

22)      S. Lambotharan, Y. Luo, C. Toker, S.R. Alty and M. Gani, “Blind Multiuser Detection of STBC Signals Using Hybrid Constant Modulus and Subspace Methods,” IEE Proceedings on Communications, vol. 153, pp.159-164, April 2006.

23)      S. Ahmed, M. Sellathurai, S. Lambotharan and J. A. Chambers, “Low Complexity Iterative Method of Equalization for SC-CP in Doubly Selective Channels,” IEEE Signal Processing Letters, vol. 13, pp.5-8, Jan. 2006.

24)      S. Lambotharan and C. Toker, “Closed-loop space time block coding techniques for OFDM based broadband wireless access systems,”  IEEE Trans. Consumer Electronics, vol. 51,  pp. 765-769, August 2005.

25)      S. Ahmed, S. Lambotharan, A. Jakobsson and J.A. Chambers, “Parameter Estimation Techniques for MIMO Frequency Selective Channels” IEE Proceedings on Communications, vol. 152, pp.  489 – 494, August 2005.

26)      Y. Luo and S. Lambotharan, "A New Tap Constrained Constant Modulus Algorithm for the Blind Equalization of Time Reversal Based STBCs through the Exploitation of Algebraic Properties," IEE Proceedings on Communications, vol. 152(3), pp. 295-301, June 2005.

27)      Ahmed, S., S. Lambotharan, A. Jakobsson and J. A. Chambers, Parameter Estimation and Equalization Techniques for Communication Channels with Multipath and Multiple Frequency Offsets,” IEEE Trans. Communications, Vol. 53(2), February 2005

28)      Toker, S. Lambotharan, J.A. Chambers and B. Baykal, “Joint Spatial and Temporal Channel Shortening Techniques for Frequency Selective Fading MIMO Channels” IEE Proceedings on Communications, vol. 152(1), pp. 89-94, February 2005.

 

Journals published prior to 2005

29)      *Toker, C., S. Lambotharan, and J.A. Chambers, “Closed-Loop Quasi-Orthogonal STBCs and Their Performance in Multipath Fading Environments and When Combined With Turbo Codes” IEEE Trans. Wireless Communications, Vol. 3(6), pp. 1890-1896, November 2004.

30)      Luo Y., J.A. Chambers, and S. Lambotharan, "Global convergence and mixing parameter selection in the cross correlation constant modulus algorithm for the multi-user environment," IEE Proceedings on Vision Image and Signal Processing, vol. 148, pp. 9-20, Feb 2001.

31)      D.J. Brooks, S. Lambotharan and J.A. Chambers, “Optimum Delay and Mean Square Error Using a Mixed Cross-Correlation and Constant Modulus Algorithm,” IEE Proceedings on Communications, vol. 147, pp. 18-22, Feb. 2000.

32)      S. Lambotharan, A.G. Constantinides and J.A. Chambers, “The Constant Modulus Receivers under Reduced Noise Amplification Objective,” IEE Proceedings on Communications, vol. 146, pp. 145-149, June 1999.

33)      S. Lambotharan and J.A. Chambers, “On the Surface Characteristics of a Mixed Constant Modulus and Cross-Correlation for the Blind Equalisation of a MIMO Channel,” Signal Processing, vol. 74(2), pp. 209-216, April 1999.

34)      S. Lambotharan, J.A. Chambers and A.G. Constantinides, “Adaptive Blind Retrieval Techniques for Multi-User DS-CDMA Signals,” IEE Electronics Letter, vol. 35(9), pp. 693-695, April. 1999.

35)      K. Skowratananont, S. Lambotharan, and J.A. Chambers, “Improved Convergence of Fractionally Spaced Constant Modulus Equalisers in the Presence of Noise,” IEE Electronics Letter, vol. 34(17), pp. 1644-1646, August 1998.

36)      K. Skowratananont, S. Lambotharan and J.A. Chambers, “A New Blind Decision Feedback Equalizer for multichannels with common zeros,” IEE Electronics Letter, vol. 34(9), pp. 845-846, April 1998.

37)      S. Lambotharan and J.A. Chambers, “New Blind Equalization structure for Deep Null Communication Channels,” IEEE Trans. Circuits and Systems: Part II, vol. 45(1), pp. 108-114, Jan. 1998.

38)      S. Lambotharan, J.A. Chambers and C.R. Johnson, Jr., “Attraction of Saddles and Slow Convergence in CMA Adaptation,” Signal Processing, vol. 59(2), pp. 335-340, June 1997.

 

Conferences published in 2012

39)      J. Tang and S. Lambotharan, “An optimal resource allocation technique for spectrum sharing MIMO wireless relay network,” IEEE ICC, Ottawa, June 2012.

40)      Z. Zhu, S. Lambotharan, W.H. Chin and Z. Fan, “An Integer Linear Programming Based Optimization for Home Demand-side Management in Smart Grid,” IEEE PES Innovative Smart Grid Technologies Conference, Washington, D.C., January 2012.

 

Conferences published in 2011

41)      Z. Zhu, S. Lambotharan, W.H. Chin and Z. Fan, “An Integer Linear Programming and Game Theory Based Optimization for Demand-side Management in Smart Grid,” IEEE GLOBECOM – SG COMNET, Houston, Dec. 2011.

42)      G. Bournaka, K. Cumanan, S. Lambotharan and F. Lazarakis, “An iterative semidefinite and Geometric programming technique for the SINR balancing in two-way relay network,” IEEE GLOBECOM, Houston, Dec. 2011.

43)      Y. Rahulamathavan and S. Lambotharan, “A Rate Balancing Technique for MIMO-Cognitive Radio Network Under a Mixed QoS Requirement,” IEEE GLOBECOM, Houston, Dec. 2011.

44)      Z. Xiong, C. Gong ; L. Wu, K. Cumanan and S. Lambotharan, “Capacity Balancing for Multiuser MIMO Cognitive Radio Network,” IEEE VTC, Sept. 2011.

45)      Y. Rahulamathavan, K. Cumanan and S. Lambotharan, “An SINR Balancing based Beamforming Technique for Cognitive Radio Networks with Mixed Quality of Service Requirements,” IEEE ICC, Kyoto 2011.

46)      K. Cumanan, J. Tang and S. Lambotharan, “Rate Balancing Based Linear Transceiver Design for Multiuser MIMO System with Multiple Linear Transmit Covariance Constraints,” IEEE ICC, Kyoto 2011.

47)      J. Tang and S. Lambotharan, “A Suboptimal User Maximization Algorithm for an OFDMA Based Cognitive Radio Network,” IEEE VTC, Budapest, May 2011.

 

Conferences published in 2010

48)      J.C. Hu, W. Wang, Z. Xiong and S. Lambotharan, “Optimization Techniques for Asynchronous Two-way Relaying Based Multiuser Multiplexing,” IEEE ICCS, Singapore, pp. 545 - 548, Nov. 2010.

49)      G. Bournaka, K. Cumanan, J.A. Chambers, S. Lambotharan and F. Lazarakis, “An SINR Balancing Based Multiuser Relaying Scheme,” IEEE ICCS, Singapore, pp. 274 – 278, Nov. 2010.

50)      A.J.G. Anandkumar, A. Anandkumar, S. Lambotharan and J.A. Chambers, “Efficiency of Rate-Maximization Game Under Bounded Channel Uncertainty,” Asilomar conf. on Sig., Sys., and Comp., Pacific Grove, USA, Nov. 2010.

51)      J. Tang, R. Yogachandran and S. Lambotharan, “Adaptive Bit Loading and Subcarrier Allocation Techniques for OFDM Based Cognitive Radio Systems,” IEEE ICCT, Nanjing, pp. 454-457, Nov. 2010.

52)      J.C. Hu, Z. Xiong, Y. Rahulamathavan, K. Cumanan and S. Lambotharan, “Optimization Techniques for Two-way Relaying Based Multiuser Multiplexing,” IEEE SPAWC 2010, Marrakech, June 2010.

53)      Y. Rahulamathavan, K. Cumanan and S. Lambotharan, “Optimal Resource Allocation Techniques for MIMO-OFDMA based Cognitive Radio Networks Using Integer Linear Programming,” IEEE SPAWC 2010, Marrakech, June 2010.

54)      Z. Xiong, K. Cumanan, Y. Rahulamathavan and S. Lambotharan, “A Robust SINR Balancing Technique for a Multiuser MIMO Cognitive Radio Network,” IEEE SPAWC 2010, Marrakech, June 2010.

55)      Z. Xiong, K. Cumanan and S. Lambotharan, “Robust SINR Balancing Technique for a Cognitive Radio Network Using Probability Based Interference Constraints,” IEEE DySPAN, Singapore, April 2010.

56)      A.J.G. Anandkumar, A. Anandkumar, S. Lambotharan and J.A. Chambers, “Robust Rate Maximization Game Under Bounded Channel Uncertainty,” IEEE ICASSP, Dallas, US, 2010.

 

Conferences published in 2009

57)      A.J.G. Anandkumar, S. Lambotharan and J.A. Chambers, “Application of distributed MIMO waterfilling algorithm for broadband channels and its performance in the presence of CSI errors,” First UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009, IIT Delhi, India, Dec. 2009.

58)      Y. Rahulamathavan, K. Cumanan, R. Krishna and S. Lambotharan, “Adaptive Subcarrier and Bit Allocation Techniques for MIMO-OFDMA based Cognitive Radio Networks,” First UK-India International Workshop on Cognitive Wireless Systems, UKIWCWS 2009, IIT Delhi, India, Dec. 2009.

59)      Z. Xiong, K. Cumanan and S. Lambotharan, “On the Benefits of Subspace Dimension Reduction for Grassmannian Multiuser Beamformers,” IEEE Statistical Signal Processing Workshop, Cardiff, pp. 658 - 661, Sept. 2009.

60)      A.J.G. Anandkumar, S. Lambotharan and J.A. Chambers, “A Game Theoretic Approach to Transmitter Covariance Matrix Design for Broadband MIMO Gaussian Interference Channels,” IEEE Statistical Signal Processing, Cardiff, UK Sept. 2009.

61)      K. Cumanan, R. Krishna and S. Lambotharan, “Fusion of Decisions Transmitted Over Multiple Observations Based Relay/Sensor Network,” IEEE Statistical Signal Processing Workshop, Cardiff, pp. 622 – 625, Sept. 2009.

62)      Y. Rahulamathavan, K. Cumanan, L. Musavian and S. Lambotharan, Optimal Subcarrier and Bit Allocation Techniques for Cognitive Radio Networks using Integer Linear Programming,” IEEE Statistical Signal Processing Workshop, Cardiff, pp. 293 – 296, Sept. 2009.

63)      M. Irfan, R. Krishna, Z. Xiong and S. Lambotharan, “Interference Mitigation Based Signal Forwarding Strategy for Wireless Relay Networks.,” EUSIPCO, Glasgow, UK, Aug. 2009,

64)      M. Davies, S. Lambotharan, J. Foster, J.A. Chambers and J. McWhirter, “Polynomial Matrix QR Decomposition and Iterative Decoding of Frequency Selective MIMO Channels,” IEEE WCNC, Budapest, April 2009.

65)      M. Davies, S. Lambotharan, J. Foster, J.A. Chambers and J. McWhirter, “A Polynomial QR Decomposition Based Turbo Equalization Technique for Frequency Selective MIMO Channels,” IEEE VTC Spring, Barcelona, April 2009.

66)      Z. Xiong, R. Krishna, S. Lambotharan and J.A. Chambers “Multiuser Orthogonal Space-Division Multiplexing with Iterative Water-Filling Algorithm,” IEEE VTC Spring, Barcelona, April 2009.

67)      K. Cumanan, R. Krishna, Z. Xiong and S. Lambotharan, “SINR Balancing Techniques and its Comparison to Semidefinite Programming Based QoS Provision for Cognitive Radios,” IEEE VTC Spring, Barcelona, April 2009.

68)      R. Krishna, K. Cumanan, Z. Xiong and S. Lambotharan, “A Semidefinite Programming Based Cooperative Relaying Strategy for Wireless Mesh Networks with Relay Signal Quantization,” IEEE VTC Spring, Barcelona, April 2009.

 

Conferences published in 2008

69)      R. Krishna, K. Cumanan, V. Sharma and S. Lambotharan, “A Robust Cooperative Relaying Strategy for Wireless Networks Using Semidefinite Constraints and Worst-case Performance Optimization,” International Symposium on Information Theory and its Applications (ISITA), Auckland, Dec. 2008.

70)      K. Cumanan, R. Krishna, V. Sharma and S. Lambotharan, “Robust Interference Control Techniques for Cognitive Radios Using Worst-Case Performance Optimization,” International Symposium on Information Theory and its Applications (ISITA), Auckland, Dec. 2008.

71)      K. Cumanan, R. Krishna, V. Sharma and S. Lambotharan, “Robust Interference Control Techniques for Multi_User Cognitive Radios Using Worst-Case Performance Optimization,” Asilomar conf. on Sig., Sys., and Comp., Pacific Grove, USA, Nov. 2008.

72)      Z. Xiong, S. Lambotharan and J.A. Chambers, “A GMD-Based Precoding Scheme for Downlink Multiuser Multistream MIMO Channels,” Asilomar conf. on Sig., Sys., and Comp., Pacific Grove, USA, Nov. 2008.

73)      V. Sharma and S. Lambotharan, “Robust Multiuser Downlink Beamforming with Per Antenna Power Constraints using Worst-Case Performance Optimization,” International Symposium on Communications and Information Technologies (ISCIT), Lao PDR, Oct. 2008.

74)      K. Cumanan, R. Krishna, V. Sharma and S. Lambotharan, “Robust Beamforming Based Interference Control Technique and its Performance for Cognitive Radios,” ISCIT, Lao PDR, Oct. 2008.

75)      M. Davies, S. Lambotharan, J.A. Chambers and J. McWhirter, “Broadband MIMO Beamforming for Frequency Selective Channels Using the Sequential Best Rotation Algorithm,” IEEE VTC Spring, Singapore, May 2008.

76)      M. Qaisrani and S. Lambotharan, ‘Estimation of Doubly Selective MIMO Channels Using Superimposed Training and Turbo Equalization,” IEEE VTC Spring, Singapore, May 2008.

77)      V. Sharma and S. Lambotharan, “Space-Time Channel Shortening Based Multiplexing Techniques Using Uplink-Downlink Duality,” IEEE VTC 2008 Spring, Singapore, May 2008.

78)      V. Sharma and S. Lambotharan, “Robust Transmit Multiuser Beamforming Using Worst Case Performance Optimization,” IEEE VTC 2008 Spring, Singapore, May 2008.

79)      V. Sharma, I. Wajid, H. Chen, A.B. Gershman and S. Lambotharan, “Robust Downlink Beamforming Using Positive Semi-definite Covariance Constraints,” International ITG Workshop on Smart Antennas - WSA 2008, Darmstadt, Feb. 2008.

 

Conferences published in 2007

80)      V. Sharma and S. Lambotharan, “Space-Time Channel Shortening Based Spatial Multiplexing Schemes for Multiusers with Multipath Channels,” Asilomar conf. on Sig., Sys., and Comp., Pacific Grove, USA, Nov. 2007. 

81)      L. Ong and S. Lambotharan, “On the rate and power allocation for MIMO based integrated voice and data transmission,” IEEE  VTC 2007 Fall, Baltimore, Oct. 2007.

82)      K. Cumanan, R. Krishna, Q. Yu and S. Lambotharan, “Maximum Likelihood Frequency Offset Estimation for Frequency Selective MIMO Channels: An Average Periodogram Interpretation and Interative Techniques,” EUSIPCO, Poznan, Sept. 2007.

83)      Q. Yu and S. Lambotharan, “An iterative Estimation and Detection Technique for OFDM Systems with Multiple Frequency Offsets (Doppler Shifts),” IEEE PIMRC, Athens, Sept. 2007.

84)      V. Sharma and S. Lambotharan, “Robust Impulse Response Shortening for Discrete Multi-tone Transceivers,” DSP 2007, Cardiff, UK, June 2007.

85)      M. Davies, S. Lambotharam and J. McWhirter, “Broadband MIMO Beamforming using Spatial-Temporal Filters and Polynomial Matrix Decomposition,” DSP 2007, Cardiff, UK, June 2007.

86)      Q. Yu and S. Lambotharan, 'Iterative (Turbo) Estimation and Detection Techniques for Frequency Selective Channels with Multiple Frequency Offsets in MIMO System,' in IEEE VTC, Dublin, Spring 2007.

87)      M. Qaisrani and S. Lambotharan, ‘An Iterative (Turbo) Channel Estimation and Symbol Detection Technique for Doubly Selective Channels,” in IEEE VTC, Dublin, Spring 2007.

88)      N.M. Eltayeb, S. Lambotharan and J.A. Chambers, “A Phase Feedback Based Extended Space Time Block Code For Enhancement of Diversity,” in IEEE VTC, Dublin, Spring 2007.

 

 

Conferences published in 2006

89)      L. Ong, S. Lambotharan,'Variable Rate and Variable Power MIMO System for Integerated Voice and Data Services,' IEEE ICCS, Singapore Nov.2006.

90)      V. Sharma and S. Lambotharan, “Robust Multiuser Beamformers and Their Performance in a Rayleigh Fading Environment,' IEEE ICCS, Singapore Nov.2006.

91)      Q. Yu and S. Lambotharan, 'Iterative Channel Estimation and Equalization Techniques for Multipath Channels with Multiple Frequency Offsets,' IEEE ICCS, Singapore Nov.2006.

92)      V. Sharma and S. Lambotharan, “Interference Suppression in Multiuser Downlink MIMO Channels Using an Iterative Optimization Approach,” in EUSIPCO, Florence, Sept. 2006.

93)      L. Ong, S. Lambotharan, J. A. Chambers andM. Shikh-Bahaei, “Performance of Bayesian Estimation based Variable Rate Variable Power MQAM System,” in IEEE PIMRC, Finland, Sept. 2006.

94)      V. Sharma and S. Lambotharan, “Multiuser Downlink MIMO Beamforming Using an Iterative Optimization Approach,” in IEEE VTC Fall, Montreal, Sept. 2006.

 

Conferences published in 2005

95)      Toker, S. Lambotharan and J.A. Chambers, “Channel Shortening for MIMO systems,” IEE DSP Enabled Radios, Southampton, Sept. 2005.

96)      C. Toker and S. Lambotharan, “On the performance Sensitivity of Orthogonalization of QO-STBC to Feedback Errors in an OFDM Environment,” COST289, Antalia, Turkey, July 2005.

97)      C. Toker, S. Lambotharan and J.A. Chambers, “Orthogonalization of Quasi-Orthogonal Space-Time Block Codes in Multipath and Multicarrier Modulation Environment,” EUSIPCO, Antalya, Sept 2005.

98)      A. Kobravi, M.R.S. Shikh-Bahaei and S. Lambotharan, “New SIC Scheme with Frequency Offset Estimation and Correction,” IEEE VTC Dallas, vol. 1, pp. 645 – 649, Sept. 2005.  

99)      S. Lambotharan and Y. Luo, “A Hybrid Antennae Selection and STBC Scheme for Multipath     Fading Channels,” IEEE VTC, vol.3, pp. 1668 – 1671, Stockholm, May 2005.

100)   C. Toker, S. Lambotharan and J.A. Chambers, “Joint Transmitter and Receiver Design for MIMO Channel Shortening,” IEEE ICASSP, vol. 4, pp. 909-912, Philadelphia, March 2005.

 

Conferences published in 2004

101)   S. Lambotharan, Y. Luo and C. Toker "Blind Multi-User Detection of Space-Time Block Coded Signals in a CDMA System," Signal Processing for Communications (SPCOM), pp. 275-279, Bangalore, Dec. 2004.

102)   C. Toker, S. Lambotharan, J. Chambers and B. Baykal, "Infinite Length Channel Shortening: A Polynomial Approach," EUSIPCO, Vienna, Aug. 2004.

103)   S. Ahmed, S. Lambotharan, A. Jakobsson and J.A. Chambers, "Parameter Estimation and Equalization Techniques For MIMO Frequency Selective Channels with Multiple Frequency Offsets," EUSIPCO, Vienna, Aug. 2004.

104)   Y. Luo and S. Lambotharan, "A new tap constrained constant modulus algorithm for blind equalization of time reversal space time block codes," IEEE SPAWC, pp. 273-277, Lisbon, July 2004.

105)   C. Toker, S. Lambotharan, J.A. Chambers and B. Baykal, "Channel Shortening Filter Design Based on Polynomial Method," IEEE VTC Spring, vol. 1, pp. 565-569, Milan, May 2004.

106)   Y. Luo, S. Lambotharan and J.A. Chambers, “A New Block Based Time-Frequency Approach For Underdetermined Blind Source Separation,” IEEE ICASSP, vol. 5, pp. 537-540, Montreal, May 2004.

 

Conferences published prior to 2004

107)   C. Toker, S. Lambotharan and J.A. Chambers, “Space Time Block Coding for Four Transmit Antennas with Closed Loop Feedback over Frequency Selective Fading Channel”, IEEE Information Theory Workshop, pp. 195-198, Paris, March/April 2003.

108)   S. Lambotharan, L. Lopes and E. Villier, “On the Interference Modelling Aspects of a UTRAN Forward Link,” IEE 3G Mobile Conference, May 2002, pp. 555-559.

109)   Villier, L. Lopes and S Lambotharan, “Approaches to Modelling the Physical Layer Performance in a UMTS Radio System Simulator,” IEE 3G Mobile Conference, pp. 560-564, London, May 2002.

110)   S. Lambotharan and L. Lopes, “Performance of Antenna Hopping Techniques for Packet Radio Transmission” IEE 3G Mobile Conference, pp. 525-528, London, May 2002.

111)   D. Molkdar and S. Lambotharan, “Impact of header error on EGPRS link level performance in IR mode,” IEE 3G Conference, pp. 114-118, London, March 2001.

112)   S. Lambotharan and J.A. Chambers, “A Cross-Uncorrelator-Initializer for the Super-Exponential Algorithms in Multi-User Environment,” Asilomar conf. on Sig., Sys., and Comp., Pacific Grove, 1999.

113)   S. Lambotharan, J.A. Chambers and A.G. Constantinides, “Leaky Constant Modulus Algorithms: Sensitivity of Local Minima,” IEEE ICASSP, vol. 5, pp. 2499-2501, Phoenix, March 1999.

114)   S. Lambotharan, J.A. Chambers and A.G. Constantinides, “A novel re-initialization technique for CMA in the presence of channel noise,” Asilomar conf. on Sig., Sys., and Comp., vol. 1, pp. 489-492, Pacific Grove, USA, Nov. 1998.  

115)   K. Skowratananont, S. Lambotharan and J.A. Chambers, “A new adaptive blind equalizer structure with robustness to loss of channel disparity,” Asilomar conf. on Sig., Sys., and Comp., vol.1, pp. 485-488, Pacific Grove, USA, Nov. 1998.

116)   S. Lambotharan, A.G. Constantinides and J.A. Chambers, “Channel Equalization Under Constant Modulus and Reduced Noise Amplification Objectives,” IEEE DSP Workshop, vol. 1, Bryce Canyon, Aug. 1998.

117)   W. Pora, S. Lambotharan, J.A. Chambers, and A.G. Constantinides, “A Constant Modulus Array for Real Signals,” EUSIPCO, vol. 4, pp. 2229-2232, Rhodes, Greece, 1998.

118)   D. Brooks, S. Lambotharan and J.A. Chambers, “Optimised delay and mean square error using CMA,” IEEE ICASSP, vol. 6, pp. 3361-3364, USA, May 1998.

119)   S. Lambotharan and J.A. Chambers, “Novel Blind Equalization structure for Deep Null Communication Channels,” IEEE ISCAS, pp. 1101-1104, Hong Kong, June, 1997.

120)   S. Lambotharan, J.A. Chambers and O. Tanrikulu, “Mixing and Switching the Norms of Adaptive Filtering Algorithms,” Int. Conf. on Digital Signal Processing, vol. 1, pp. 130-135, Cyprus, 1995.