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Author(s): |
Guo-hai Yu, Institute of Communications Engineering, PLA University of Sci. & Tech, Nanjing, China
Cheng-gui Wang, Institute of Communications Engineering, PLA University of Sci. & Tech, Nanjing, China
Ya-long Zhang, Institute of Communications Engineering, PLA University of Sci. & Tech, Nanjing, China |
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Abstract: |
Cooperative communications, where parallel relays forward information to a destination node, can greatly improve the energy efficiency and latency in ad-hoc networks. Communications using rateless codes, in which the source transmits an infinite number of parity bits to the destination until the receipt of an acknowledgement, provides a natural and efficient mechanism for accumulating information from multiple transmitting relays. The impact of the half-duplex constraint on the throughput of the system using rateless codes to harness spatial diversity and efficiently transmit information from a source to a destination is analyzed in our paper. Specially, the direct path from source to destination in a free-space path loss and smallscale Rayleigh environment is considered, which is often ignored in many other papers. Simulations show that the direct path plays an important role in the data transmission, especially when the number of relays is not very big. It can be seen that as the number of relays increase, the throughput approaches the system that using the same number of full-duplex relays.
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