Zero-Delay Hybrid Digital-Analog Coding Under Energy Constraints

This letter proposes a coding scheme for transmitting a Gaussian source with energy constraints in zero source delay scenario. While previous studies focused on the achievable minimum distortion with an infinite number of channel symbols, we also consider the robustness to finite symbols. The constructed scheme is based on the hybrid digital-analog (HDA) coding method, which encodes the quantized value of the source and the quantization error using a large number of channel symbols in total. Theoretical analysis reveals that our scheme achieves the optimal exponent and the same polynomial decay as in the existing work. Experimental results validate the performance gains of our scheme over the cutting-edge ones.