Analog joint source-channel coding for MIMO Multiple Access Channels

Abstract

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 CDMAlike 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).

Overhead-Performance Tradeoffs in Distributed Wireless Networks

“…Also, motivated by the need not-only to compute control decisions at a controller in a manner requiring minimal information exchange with users in the network, but also to convey the salient part of the control decisions back to the users over their unreliable channels, the project exerted substantial effort on the joint source channel coding problem for unknown channels. Here, we have studied novel rateless coding schemes for high throughput transmission for a wide range of single and multi-terminal sources and different channel environments [6,9,10,20,23,24,26,27,30]. Different from existing rateless systems, we have focused on the application of hybrid analog-digital joint source-channel coding schemes, inspired in novel developments in the field of analog joint source-channel coding.…”