Approaching the Shannon Limit by Means of Optimal FTN Signals with Increased Size of PAM Signal Constellation

2019 ◽  
Author(s):  
Anna S. Ovsyannikova ◽  
Sergey V. Zavjalov ◽  
Ilya I. Lavrenyuk ◽  
Sergey B. Makarov ◽  
Dmitrii Solomitckii
Keyword(s):  
Signal Constellation

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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