C. S. Leung

Ph.D. (Stanford), P. Eng.

Professor

Department of Electrical and Computer Engineering

My research interests are in the area of efficient, reliable and secure transmission of information in mobile radio communication systems. Such systems are of great commercial interest as exemplified by the rapid growth in the cellular telephone industry and increasing subscriber demand for mobile data services. At the physical layer level, we are interested in the design and performance evaluation of efficient techniques for communication over the mobile radio fading channel. These include soft decision decoding, multi-user detection and space-time coding. The reliability of the received information, as quantified by the probability of undetected error, is another issue being examined. At the data link layer level, methods for efficiently sharing a common channel among a number of mobile users for multiple-access as well as broadcast situations are being studied. These include the performances of different ARQ and multiplexing schemes for point-to-multipoint transmission. Also of interest is the performance evaluation of existing and new routing strategies for use in multihop mobile packet radio networks and resource allocation and QoS issues in mixed media networks. Issues in the design of cellular systems such as channel asignment, mobility management and transmit diversity are being explored. Another research area is communication network security.

Selected Publications

Y. Zhang and C. Leung, ``Performance of Equal Power Allocation in Multiuser OFDM-based Cognitive Radio Systems'', Research Letters in Communications, vol. 2008, Article ID 420478, 2008.
M. Elkashlan, C. Leung and R. Schober, ``Error Performance of General Order Selection in Correlated Nakagami Fading Channels'', IET Communications, vol. 2, no. 7, pp. 928-934, Aug. 2008.
R. Kwan, C. Leung, and J. Zhang, ``Multiuser Scheduling on the Downlink of an LTE Cellular System'', Research Letters in Communications, vol. 2008, Article ID 323048, 2008.
M. Elkashlan, T. Khattab, C. Leung and R. Schober, ``Statistics of General Order Selection in Correlated Nakagami Fading Channels'', IEEE Transactions on Communications, vol. 56, no. 3, pp. 344-346, Mar. 2008.
R. Kwan and C. Leung, ``Performance of a CDMA system employing AMC and Multicodes in the Presence of Channel Estimation Errors'', IEEE Transactions on Communications, vol. 56, no. 2, pp. 189-193, Feb. 2008.
R. Kwan and C. Leung, ``On the Applicability of the Pearson Method for Approximating Distributions in Wireless Communications'', IEEE Transactions on Communications, vol. 55, no. 11, pp. 2065-2069, Nov. 2007.
R. Kwan and C. Leung, ``Downlink Scheduling Schemes for CDMA Networks with Adaptive Modulation and Coding and Multicodes'', IEEE Transactions on Wireless Communications, vol. 6, no. 10, pp. 3668-3677, Oct. 2007.
R. Kwan, P. Ho and C. Leung,``On Joint Order Statistics in Correlated Nakagami Fading Channels'', IEEE Communications Letters, vol. 11, no. 9, pp. 717-719, Sept. 2007.
R. Kwan and C. Leung, ``General Order Selection Combining for Nakagami and Weibull Fading Channels'', IEEE Transactions on Wireless Communications, vol. 6, no. 6, pp. 2027-2033, June 2007.
A. Parihar, L. Lampe, R. Schober and C. Leung, ``Equalization for DS-UWB Systems - Parts I & II'', IEEE Transactions on Communications, vol. 55, no. 6, pp. 1164-1173, June & Aug. 2007.
R. Kwan, C. Leung and P. Ho, ``On the Distribution of Ordered Eigenvalues of Wishart Matrices'', IET Electronics Letters, vol. 43, no. 5, pp. 277-279, Mar. 2007.
M. Elkashlan, C. Leung and R. Schober, ``Performance Analysis of Channel Aware Frequency Hopping'', IEE Proceedings - Communications, vol. 153, Issue 6, pp. 841-845, Dec. 2006.
R. Kwan and C. Leung, ``Approximating Distribution of Symbol Error Rates in Nakagami-m Fading Channels'', IEE Electronics Letters, vol. 42, no. 13, pp. 766-767, June 2006.
R. Kwan and C. Leung ``Downlink Scheduling Optimization in CDMA Networks'', IEEE Communications Letters, vol. 8, no. 10, pp. 611-613, Oct. 2004.
H. Fattah and C. Leung, ``An Improved Round Robin Packet Scheduler for Wireless Networks'', International Journal of Wireless Information Networks, vol. 11, no. 1, pp. 41-54, Jan. 2004.
M. Elkashlan and C. Leung, ``Channel Aware Frequency Hopping Multiple Access Scheme'', Electronics Letters, vol. 39, no. 25, pp. 1854-1855, Dec. 2003.
H. Fattah and C. Leung, ``Load-based Transmission Rate Assignment Scheme for an Integrated Voice/Data DS-CDMA System'', Electronics Letters, vol. 39, no. 13, pp. 1011-1013, June 2003.
V. Dinesh and C. Leung, ``Error Performance of BPSK in Fast Rician Fading Channels''. Electronics Letters, vol. 39, no. 9, pp. 741-742, May 2003.
D. Gu and C. Leung, ``Performance Analysis of a Transmit Diversity Scheme with Imperfect Channel Estimation''. Electronics Letters, vol. 39, no. 4, pp. 402-403, Feb. 2003.
P.H.J. Chong and C. Leung, ``Performance of Reuse Partitioning in Cellular Systems with Mobile Users''. International Journal of Wireless Information Networks, vol. 10, no. 1, pp. 17-31, Jan. 2003.
H. Fattah and C. Leung, ``An Overview of Scheduling Algorithms in Wireless Networks''. IEEE Wireless Communications, vol. 9, no. 5, pp. 76-83, Oct. 2002.
R. Kwan and C. Leung, ``Optimal Detection of a BPSK Signal Contaminated by Interference and Noise''. IEEE Communications Letters, vol. 6, no. 6, pp. 225-227, June 2002.
P.H.J. Chong and C. Leung, ``Capacity Improvement in Cellular Systems with Reuse Partitioning'', Journal of Communications and Networks, vol. 3, no. 3, pp. 280-287, Sept. 2001.
P.H.J. Chong and C. Leung, ``NCFSK Bit Error Rate with Unsynchronized Slowly Fading Interferers'', IEEE Transactions on Communications, vol. 49, no. 2, pp. 272-281, Feb. 2001.
X. Feng and C. Leung, ``Performance Sensitivity Comparison of Two Diversity Schemes'', Electronics Letters, vol. 36, no. 9, pp. 838-839, April 2000.
V. Wong and C. Leung, ``Diversity Reception in a Multihop Packet Radio Network'', ACM/Baltzer Mobile Networks and Applications Journal, vol. 5-1, pp. 39-47, 2000.