scholarly journals Spectral efficiency of adaptive OFDM systems over high mobility Nakagami-m fading channels

2020 ◽  
Vol 8 (1) ◽  
pp. 628-638
Author(s):  
Xiuyan Zhang ◽  
Qiming Sun ◽  
Yan Gao
Keyword(s):  
Fading Channels ◽  
Spectral Efficiency ◽  
High Mobility ◽  
Ofdm Systems ◽  
Adaptive Ofdm

On the Spectral Efficiency of Rate and Subcarrier Bandwidth Adaptive OFDM Systems Over Very Fast Fading Channels

2016 ◽  
Vol 65 (8) ◽  
pp. 6038-6050 ◽  
Author(s):  
Zhicheng Dong ◽  
Pingzhi Fan ◽  
Rose Qingyang Hu ◽  
Jake Gunther ◽  
Xianfu Lei
Keyword(s):  
Fading Channels ◽  
Spectral Efficiency ◽  
Ofdm Systems ◽  
Fast Fading ◽  
Adaptive Ofdm

scholarly journals Adaptive Turbo-Coded Hybrid-ARQ in OFDM Systems over Gaussian and Fading Channels

2017 ◽  
Vol 2 (1) ◽  
pp. 3 ◽  
Author(s):  
Kingsley Oteng-Amoako ◽  
Saeid Nooshabadi
Keyword(s):  
Channel Estimation ◽  
Fading Channels ◽  
Spectral Efficiency ◽  
Analytical Approach ◽  
Code Rate ◽  
Ofdm Systems ◽  
Hybrid Arq ◽  
Signal Constellation ◽  
Type Iii

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.

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