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Analog joint source channel coding for MIMO broadcast channels

We study the application of analog Joint Source Channel Coding (JSCC) techniques for the transmission of discrete-time, continuous-amplitude source information symbols over the Multiple-Input Multiple-Output (MIMO) Broadcast Channel (BC). Two channel access methods are proposed with different requirements regarding channel knowledge at transmission: Code Division Multiple Access (CDMA) and linear Minimum Mean Square Error (MMSE). The obtained results show that the CDMA scheme performs rather well when the channel responses are unknown at transmission, whereas the linear MMSE access approaches the Optimal Performance Theoretically Attainable (OPTA) when the channel information is also available at transmission.