Open Access

Combined Source-Channel Coding of Images under Power and Bandwidth Constraints

EURASIP Journal on Advances in Signal Processing20062007:049172

Received: 8 June 2006

Accepted: 14 October 2006

Published: 7 December 2006


This paper proposes a framework for combined source-channel coding for a power and bandwidth constrained noisy channel. The framework is applied to progressive image transmission using constant envelope -ary phase shift key ( -PSK) signaling over an additive white Gaussian noise channel. First, the framework is developed for uncoded -PSK signaling (with ). Then, it is extended to include coded -PSK modulation using trellis coded modulation (TCM). An adaptive TCM system is also presented. Simulation results show that, depending on the constellation size, coded -PSK signaling performs 3.1 to 5.2 dB better than uncoded -PSK signaling. Finally, the performance of our combined source-channel coding scheme is investigated from the channel capacity point of view. Our framework is further extended to include powerful channel codes like turbo and low-density parity-check (LDPC) codes. With these powerful codes, our proposed scheme performs about one dB away from the capacity-achieving SNR value of the QPSK channel.


Additive White Gaussian NoiseChannel CodeNoisy ChannelAdditive White Gaussian Noise ChannelPowerful Channel


Authors’ Affiliations

Department of Electrical and Computer Engineering, Texas A&M University, College Station, USA
Department of Electrical Engineering, University of Hawaii, Honolulu, USA


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© Raja et al. 2007