Reduced-complexity detection for MIMO channels:

Derived a constraint-delay MAP algorithm for MIMO detection, based on the trellis representation of the MIMO signals. It is a generalization of the successive interference cancellation while relying on soft-decision feedback. Excellent performance/complexity tradeoff can be achieved compared to existing schemes, such as BLAST detection, sphere decoding and ML detection. Applying precoding at the transmitter side to generate a spatially partial response channel will collaborate with this detection algorithm and enhance the performance significantly.

 

Bit-interleaved coded modulation (BICM) with space-time coding:

Considered the concatenation of BICM with trellis or block type of space-time coding, to exploit the available time-frequency diversity while guaranteeing the spatial diversity; conducted performance evaluation through simulations, error bounds, and extrinsic information transfer (EXIT) chart analysis.

 

Orthogonal Frequency Division Multiplexing (OFDM) modulations:

Proposed a decision-directed channel estimation algorithm for OFDM in MIMO case, utilizing the available preamble and data information, and is backward-compatible to 802.11a standard.

 

Turbo code / Low Density Parity Check (LDPC) coding in magnetic recordings:

Investigated high-rate Turbo code with precoders, and LDPC with message-passing decoding algorithm based on factor graph, and conducted the convergence analysis by density-evolution technique.