Analog joint source-channel coding for MIMO Multiple Access Channels

We present two access schemes for the transmission of discrete-time analog symbols over a block fading MIMO Multiple Access Channel (MAC). We first describe a CDMA-like strategy employed to allow the orthogonal transmission of the information of the multiple users. When the Channel State Information (CSI) is available at the transmitters, we propose to exploit such a knowledge to obtain the optimal linear access codes that minimize the sum-MSE. Both schemes provide a flexible framework where the access codes of the MAC users can be designed for any distribution of the user rates. We also show that the performance of the proposed systems closely approach the theoretical limits when the source information is transmitted over the MIMO MAC using analog Joint Source Channel Coding (JSCC).