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The computational complexity of H.264 video coding standard is two or three times higher than that of H.263 and MPEG-4. Especially, the operations of the entropy coding and deblocking filter are the most complex parts in the decoder. In order to reduce the computational complexity of these operations, we propose a fast algorithm for H.264 decoder implementation, which containing a group-based CAVLC...
We propose a genetic algorithm (GA) based equalization approach for direct sequence ultra-wideband (DS-UWB) wireless communications, where GA is combined with a RAKE receiver to combat the inter-symbol interference (ISI) due to the frequency selective nature of UWB channels for high data rate transmission. Simulation results show that the proposed GA based structure significantly outperforms the RAKE...
We propose an adaptive frequency-domain channel estimator based on Kalman smoothing for uplink multiple input multiple output (MIMO) orthogonal frequency division multiplexing access (OFDMA) systems. The application of Kalman smoothing in frequency-domain channel estimation results in a much lower computational complexity than time-domain estimation approaches. Channel interpolation is employed to...
The genetic algorithm (GA) is a well studied technique, which can obtain efficiently a near-optimal solution with much lower computational complexity compared to the maximum likelihood detection (MLD) approach. In overloaded MIMO systems, since the number of near equal-power co-channel interferers is higher than the number of receive antennas, the interference cannot be completely removed by spatial...
We propose a novel packet batch dependant cross-layer scheduling scheme for the downlink multiuser orthogonal frequency division multiplexing (OFDM) system, which significantly outperforms the existing queue dependant scheduling scheme over a wide range of signal-to-noise (SNR) in terms of the system bandwidth efficiency, best-effort (BE) traffic throughput and quality of service (QoS) traffic delay,...
We propose a novel cross-layer optimization scheme for the downlink multiuser orthogonal frequency division multiplexing (OFDM) system. The proposed maximum weighted capacity (MWC) based resource allocation at the physical (PHY) layer can provide a much better QoS than the previous resource allocation schemes, while maintaining the highest or nearly highest capacity and costing a similar complexity...
This paper proposes a reduced complexity blind layered space-time equalization (LSTE) for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM). Blind source separation (BSS) combined with a vertical Bell Laboratories layered space-time (V-BLAST) scheme is used in a small portion of subcarriers to perform blind signal detection and channel estimation iteratively....
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