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Implications of the half-duplex constraint on relay-aided cooperation using rateless codes

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2 Author(s)
Meshram, R. ; Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India ; Mehta, N.B.

The half-duplex constraint, which mandates that a cooperative relay cannot transmit and receive simultaneously, considerably simplifies the demands made on the hardware and signal processing capabilities of a relay. However, the very inability of a relay to transmit and receive simultaneously leads to a potential under-utilization of time and bandwidth resources available to the system. We analyze the impact of the half-duplex constraint on the throughput of a cooperative relay system that uses rateless codes to harness spatial diversity and efficiently transmit information from a source to a destination. We derive closed-form expressions for the throughput of the system, and show that as the number of relays increases, the throughput approaches that of a system that uses more sophisticated full-duplex nodes. Thus, half-duplex nodes are well suited for cooperation using rateless codes despite the simplicity of both the cooperation protocol and the relays.

Published in:

Communications (NCC), 2010 National Conference on

Date of Conference:

29-31 Jan. 2010