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In this paper, delay-free, low complexity, joint source-channel coding (JSCC)for transmission of two correlated Gaussian memoryless sources over a GaussianMultiple Access Channel (GMAC) is considered. The main contributions of thepaper are two distributed JSCC schemes: one discrete scheme based on nestedscalar quantization, and one hybrid discrete-analog scheme based on a scalarquantizer and a linear continuous mapping. The proposed schemes show promisingperformance which improve with increasing correlation and are robust againstvariations in noise level. Both schemes exhibit a constant gap to theperformance upper bound when the channel signal-to-noise ratio gets large.

Zero-Delay Joint Source-Channel Coding for a Bivariate Gaussian on a Gaussian MAC