Combined Source-Channel Coding of Images under Power and Bandwidth Constraints
<p/> <p>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 <inline-formula><graphic file="1687-6180-2007-049172-i1.gif&quo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2007-01-01
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| Series: | EURASIP Journal on Advances in Signal Processing |
| Online Access: | http://asp.eurasipjournals.com/content/2007/049172 |
| Summary: | <p/> <p>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 <inline-formula><graphic file="1687-6180-2007-049172-i1.gif"/></inline-formula>-ary phase shift key ( <inline-formula><graphic file="1687-6180-2007-049172-i2.gif"/></inline-formula>-PSK) signaling over an additive white Gaussian noise channel. First, the framework is developed for uncoded <inline-formula><graphic file="1687-6180-2007-049172-i3.gif"/></inline-formula>-PSK signaling (with <inline-formula><graphic file="1687-6180-2007-049172-i4.gif"/></inline-formula>). Then, it is extended to include coded <inline-formula><graphic file="1687-6180-2007-049172-i5.gif"/></inline-formula>-PSK modulation using trellis coded modulation (TCM). An adaptive TCM system is also presented. Simulation results show that, depending on the constellation size, coded <inline-formula><graphic file="1687-6180-2007-049172-i6.gif"/></inline-formula>-PSK signaling performs 3.1 to 5.2 dB better than uncoded <inline-formula><graphic file="1687-6180-2007-049172-i7.gif"/></inline-formula>-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.</p> |
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| ISSN: | 1687-6172 1687-6180 |