MathDB5 problems
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The conjecture that joint source-channel coding is more efficient than separate coding
Joint source-channel coding (JSCC) combines source and channel coding for a discrete memoryless source and a discrete memoryless channel, whereas tandem coding performs source and…
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Nonattainability of the outer bound under bandwidth mismatch
Nonattainability conjecture. For both bandwidth compression and bandwidth expansion, the outer bound cannot be achieved by any source-channel code.
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Conjecture that no single practical modulation scheme is universally optimal under bandwidth expansion
Conjecture. This result holds whenever the source rate differs from the channel rate.
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The asymptotic slope conjecture for single analog-matching encoders
Asymptotic slope conjecture. For any source and channel spectra of BW ratio , no single encoder which satisfies … .
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Coward's repeated quantization conjecture for minimal-delay source-channel coding
Let be the number of uses of a Gaussian channel. A source-channel scheme may quantize a source symbol, transmit the resulting quantized point, and then quantize the remaining…