Turbo codes: principles and applications
Turbo codes: principles and applications
Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission over Fading Channels
Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission over Fading Channels
OFDM Wireless LANs: A Theoretical and Practical Guide
OFDM Wireless LANs: A Theoretical and Practical Guide
OFDM for Wireless Communications Systems
OFDM for Wireless Communications Systems
Robust JPEG image transmission using unequal error protection and code combining
International Journal of Communication Systems
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Adaptive cross-layer protection strategies for robust scalable video transmission over 802.11 WLANs
IEEE Journal on Selected Areas in Communications
Rate-distortion optimized hybrid error control for real-time packetized video transmission
IEEE Transactions on Image Processing
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In this paper we investigate the performance of JPEG image transmission over the IEEE 802.11a WLAN, using Multiple Diversity Combining (MDC) and Unequal Error Protection (UEP). An MDC scheme is obtained by simultaneously employing transmitter diversity, receiver diversity and retransmission diversity. UEP is performed by first optimizing the number of headers allocated to the subbands of a JPEG image to prevent error propagation, and secondly by optimizing the number of retransmissions with a view to minimize the channel induced distortion. The MDC-UEP strategy has been employed with both Convolutional and Turbo codes. Simulation results show that a gain of 8 dB in PSNR can be obtained with MDC-UEP in the range 0 dB 驴 Eb/No 驴 3 dB, over a scheme which uses MDC with Equal Error Protection (EEP). Moreover MDC-UEP with Turbo codes provides a gain of 0.5 dB in PSNR and 5 percent in throughput over an MDC-UEP scheme with Convolutional codes.