Jingshown Wu

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Accurate and efficient channel estimation is important in multiple-antenna communication systems in order to effectively reduce the mutual interference among different transmitting antennas. For a nondispersive channel that is modeled by a single tap for each transmitting and receiving antenna pair, the well-known Hadamard sequences can be applied to(More)
In this paper, the family of newly constructed codes, named 2-D perfect difference codes, is proposed to suppress the phase-induced intensity noise (PIIN) in noncoherent spatial/spectral optical code division multiple access (OCDMA) systems. A novel spatial/spectral transceiver structure employing the new codes to eliminate the multiuser interference (MUI)(More)
We propose newly constructed two-dimensional hybrid codes (2-D hybrid codes) and the corresponding system architecture for a spectral/spatial optical code division multiple access (OCDMA) system. We employ unidimensional (1-D) integer lattice codes and 1-D perfect difference codes to construct the 2-D hybrid codes. This proposed system can suppress the(More)
In this letter, we present a new code family named the extended perfect difference codes (EPDC) suitable for passive optical network (PON) using compact SAC OCDMA encoder and decoder. Applying a mapping technique, we construct the EPDC, which not only still retain the cyclic property but also can provide flexible code length. Because of the cyclic property,(More)
Spectrum is a limited and precious resource in wireless communications. Effective spectrum utilization becomes more and more important because of the expeditious increase of demand for wireless communications. In principle, the dual-polarization frequency reuse system, which employs two orthogonally polarized electromagnetic waves to carry information, can(More)
This paper concerns scheduling parallel programs in multiprocessing systems. The goal is to improve the job turnaround time and speedup. As most programs are not fully paraiielizable, parallel programs consisting of serial, partially parallel, and (perfectly) parallel stages, are modeled by task graphs which depict the parallelism profiles. In another(More)