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Transmitting real-time multimedia data has been a big challenge for wireless communications. The QoS experienced by the multimedia traffic is subject to the time-variant characteristics of the wireless channels. In this paper, a cross-layer algorithm is proposed to combat the wireless channel variation by adjusting the multimedia codec settings according to the MAC frame error rate in real-time. The...
The proposed singular value decomposition (SVD) aided spatial multiplexing (SM) based multiple-input-multiple-output (MIMO) system is capable of achieving a high bandwidth efficiency. The SVD operation effectively splits the MIMO channel into orthogonal eigen-beams having unequal bit-error-ratios (BERs). This property may be exploited for the transmission of speech, audio, video and other multimedia...
In this paper a new non-predictive video codec for mobile applications is presented. The non-predictive scheme omits prediction step in the temporal axis. Hence, it increases robustness for transmission at low bit rate in mobile channel. The video sequence is grouped into a number of frames (GOP) and the same subband from each frame in the GOP are joined together to exploit their spatial-temporal...
The provision of broadband satellite services depends on the utilisation of efficient and reliable radio interface, which has the ability to adapt to variable propagation channel conditions. In order to use the available spectrum more efficiently and to maximise the link reliability this paper presents the analysis of possible utilisation of LDPC decoder parameters to improve the performance of the...
With recent developments in forward error correction (FEC) schemes, low-density parity check (LDPC) codes are gaining more and more popularity with their performance approaching to near Shannon's limits. In this paper a flexible LDPC codec is designed and optimized for OFDM transceivers in aeronautical channels. We considered OFDM based aeronautical communication systems and investigated en-route...
Joint source channel coding (JSCC) technique is used to design an image transmission system using Reed Solomon (RS) channel coder by providing a feedback mechanism. The proposed codec offers wide range of choices to the user to achieve compression and the desired data rate corresponding to an image quality. Performance of the set partitioning in hierarchical trees (SPIHT) and RS coder for different...
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