Fundamentals of statistical signal processing: estimation theory
Fundamentals of statistical signal processing: estimation theory
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Microwave Mobile Communications
Microwave Mobile Communications
Graceful Degradation over Packet Erasure Channels through Forward Error Correction
DCC '99 Proceedings of the Conference on Data Compression
Pilot-based estimation of time-varying multipath channels forcoherent CDMA receivers
IEEE Transactions on Signal Processing
Optimal insertion of pilot symbols for transmissions over time-varying flat fading channels
IEEE Transactions on Signal Processing
Adaptive PSAM accounting for channel estimation and prediction errors
IEEE Transactions on Wireless Communications
Performance degradation of OFDM systems due to Doppler spreading
IEEE Transactions on Wireless Communications
An integrated source transcoding and congestion control paradigmfor video streaming in the Internet
IEEE Transactions on Multimedia
Robust progressive image transmission over OFDM systems using space-time block code
IEEE Transactions on Multimedia
Priority encoding transmission
IEEE Transactions on Information Theory - Part 1
Pilot tone selection for channel estimation in a mobile OFDM system
IEEE Transactions on Consumer Electronics
IEEE Journal on Selected Areas in Communications
IEEE Transactions on Image Processing
A cross-Layer diversity technique for multicarrier OFDM multimedia networks
IEEE Transactions on Image Processing
A new, fast, and efficient image codec based on set partitioning in hierarchical trees
IEEE Transactions on Circuits and Systems for Video Technology
A study on the SPIHT image coding technique for underwater acoustic communications
Proceedings of the Sixth ACM International Workshop on Underwater Networks
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Coding and diversity are very effective techniques for improving transmission reliability in a mobile wireless environment. The use of diversity is particularly important for multimedia communications over fading channels. In this work, we study the transmission of progressive image bitstreams using channel coding in a 2-D time-frequency resource block in an OFDM network, employing time and frequency diversities simultaneously. In particular, in the frequency domain, based on the order of diversity and the correlation of individual subcarriers, we construct symmetric n-channel FEC-based multiple descriptions using channel erasure codes combined with embedded image coding. In the time domain, a concatenation of RCPC codes and CRC codes is employed to protect individual descriptions.We consider the physical channel conditions arising from various coherence bandwidths and coherence times, leading to a range of orders of diversities available in the time and frequency domains.We investigate the effects of different error patterns on the delivered image quality due to various fade rates. We also study the tradeoffs and compare the relative effectiveness associated with the use of erasure codes in the frequency domain and convolutional codes in the time domain under different physical environments. Both the effects of intercarrier interference and channel estimation errors are included in our study. Specifically, the effects of channel estimation errors, frequency selectivity and the rate of the channel variations are taken into consideration for the construction of the 2-D time-frequency block. We provide results showing the gain that the proposed model achieves compared to a system without temporal coding. In one example, for a system experiencing flat fading, low Doppler, and imperfect CSI, we find that the increase in PSNR compared to a system without time diversity is as much as 9.4 dB.