Analysis and construction of full-diversity joint network-LDPC codes for cooperative communications

Authors:
Dieter Duyck;Daniele Capirone;Joseph J. Boutros;Marc Moeneclaey
Affiliations:
Department of Telecommunications and Information Processing, Ghent University, Gent, Belgium;Department of Electronics, Politecnico di Torino, Torino, Italy;Electrical Engineering Department, Texas A&M University at Qatar, Doha, Qatar;Department of Telecommunications and Information Processing, Ghent University, Gent, Belgium
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on physical-layer network coding for wireless cooperative networks
Year:
2010

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Abstract

Transmit diversity is necessary in harsh environments to reduce the required transmit power for achieving a given error performance at a certain transmission rate. In networks, cooperative communication is a well-known technique to yield transmit diversity and network coding can increase the spectral efficiency. These two techniques can be combined to achieve a double diversity order for a maximum coding rate Rc = 2/3 on the Multiple-Access Relay Channel (MARC), where two sources share a common relay in their transmission to the destination. However, codes have to be carefully designed to obtain the intrinsic diversity offered by the MARC. This paper presents the principles to design a family of full-diversity LDPC codes with maximum rate. Simulation of the word error rate performance of the new proposed family of LDPC codes for the MARC confirms the full diversity.