Izvorni znanstveni članak
https://doi.org/10.24138/jcomss.v2i1.300
Adaptive Turbo-Coded Hybrid-ARQ in OFDM Systems over Gaussian and Fading Channels
Kingsley Oteng-Amoako
; School of Electrical Engineering and Telecommunications, University of New South Wales, NSW, 2052, Australia
Saeid Nooshabadi
; School of Electrical Engineering and Telecommunications, University of New South Wales, NSW, 2052, Australia
Sažetak
In this paper, an analytical approach for spectral efficiency maximization of coded wideband transmissions is presented based on OFDM. The approach exploits Type-III Hybrid-ARQ, enabling all sub-carriers to be employed in codeword transmission regardless of the sub-carrier conditions. The effects of imperfect sub-channel estimation are characterized and compensated for during code rate and signal constellation optimization. The results of the paper highlight that by independently adapting the code rate and signal constellation to individual OFDM sub-carriers based on an estimated sub-carrier CSI, the overall spectral efficiency of the system is maximized.
Ključne riječi
Hybrid-ARQ; AMC; adaptive; fading; diversity combining and turbo codes
Hrčak ID:
180752
URI
Datum izdavanja:
27.3.2006.
Posjeta: 1.023 *