Abstract
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.
Highlights
Shannon’s separation principle [1] states that source coding and channel coding could be optimized individually and operated in a cascaded system without sacrificing optimality
The embedded property of set partitioning in hierarchical trees (SPIHT) coded image bitstream has been exploited to provide unequal error protection (UEP) by the use of different channel codes with codes of higher rates allocated to the tail of the bitstream
This paper proposes a combined source-channel coding framework based on embedded image coders such as SPIHT and JPEG2000
Summary
Shannon’s separation principle [1] states that source coding and channel coding could be optimized individually and operated in a cascaded system without sacrificing optimality. The embedded property of SPIHT coded image bitstream has been exploited to provide unequal error protection (UEP) by the use of different channel codes with codes of higher rates allocated to the tail of the bitstream It has been shown in [8, 9] that optimal UEP (with much high complexity and longer delay) only offers a small performance gain over optimal equal error protection (EEP) for BSCs. it has been shown in [8, 9] that optimal UEP (with much high complexity and longer delay) only offers a small performance gain over optimal equal error protection (EEP) for BSCs This motivates us to study efficient transmission scheme obtained with constellation expansion, that is, coded modulation, in the spirit of EEP that does not lead to bandwidth expansion as in [7].
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