|Current Research Interests
1. Generalized opportunistic communications
a. Efficient preamble and spreading sequences and protocol designs for cognitive radio (CR) based spread spectrum systems.
b. Optimal and near optimal radio resource allocation schemes for non-orthogonal channel based systems with latency and fairness constraints.
c. Combining resource allocation, scheduling and routing for cooperative MIMO networks.
d. Distributed-cooperative spectrum sensing schemes using quantized local information and compressive sampling/detection.
2D and 3D location-spectrum and noise temperature map reconstruction for exploring new degrees of freedom in signal transmission.
e. Interference control for two-tier location-aware femto cell systems that minimizes intra-tier and cross-tier interference for optimal cell coverage
and maximum network capacity.
f. Game theoretic approach for opportunistic and resource optimized communications.
2. Inner Transceiver Design: Precoding, Synchronization, Channel Estimation, Interference Cancellation and Suppression
a. Reduced-complexity nonlinear MIMO transceiver design and performance analysis..
b. Efficient cell search and link acquisition methods for hierarchical multicell OFDMA systems.
c. Network synchronization for hierarchical and ad hoc networks.
3. Advanced Error-Control Schemes and Sequence Design
a. HARQ protocols for multiuser MIMO-OFDMA systems that take into account transmission scheduling, power/rate control, precoding and cooperative relay/coding.
b. Serialized and stochastic LDPC code decoding: structures, scheduling and convergence analysis.
c. Annealed and randomized belief propagation algorithms for binary networks.
d. Cyclic code based preamble sequences design for OFDMA networks.