Optimising energy efficiency of LDPC coded chase combining HARQ system | Zendy

Wu Yue | Zendy; Yang Hongwen | Zendy

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Optimising energy efficiency of LDPC coded chase combining HARQ system

Author(s) -

Wu Yue,

Yang Hongwen

Publication year - 2015

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

eISSN - 1350-911X

pISSN - 0013-5194

DOI - 10.1049/el.2014.4462

Subject(s) - hybrid automatic repeat request , low density parity check code , computer science , efficient energy use , energy (signal processing) , electronic engineering , real time computing , decoding methods , computer network , algorithm , engineering , telecommunications link , electrical engineering , mathematics , statistics

The energy efficiency of the low‐density parity check (LDPC) coded chase combining hybrid automatic repeat request (HARQ) system over the additive white Gaussian noise channel is analysed. The energy efficiency can be improved by increasing the maximum transmission number ( K ) and reducing the transmit power. The asymptotic energy efficiency corresponding to K = ∞ equals the reciprocal of the threshold signal‐to‐noise ratio of the forward error correction code, which does not depend on the falling speed of the word error ratio. When the retransmission number is relatively small, optimising equal transmit power and variable transmit power can improve the energy efficiency by up to 10 and 18% respectively, compared with minimum equal power transmission.

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