Source Correlation, Transmit Diversity, and Channel Coding in Wireless Multiple-Access Communications
نویسندگان
چکیده
In this paper, we study the performance of simple wireless multiple-access communication systems, where two correlated sources communicate to an access point (AP) directly or, possibly, by using a relay node. In particular: if no relay is used, then the two sources make use of channel coding; if the relay is used, then the two sources transmit uncoded information and the relay adds redundancy (i.e., parity bits). In particular, we consider the use of low-density parity-check (LDPC) coding, and we compare different systems by keeping fixed the overall coding rate. In all cases, we compare the performance of receivers which, respectively, exploit or do not exploit the source correlation. We analyze the relative impact of transmit diversity (increased when a relay is used) with respect to channel coding, distinguishing, respectively, between scenarios with block-faded communication links and memoryless links. In the latter case, the presence of additive white Gaussian noise (AWGN) or bit-level independent Rayleigh fading is considered.
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