Hybrid ARQ Scheme with Intercarrier Interference Mitigation for OFDM Systems

2008 ◽  
Author(s):  
Rong-Terng Juang ◽  
Kun-Yi Lin ◽  
Pangan Ting ◽  
Hsin-Piao Lin ◽  
Ding-Bing Lin
Keyword(s):  
Interference Mitigation ◽  
Intercarrier Interference ◽  
Ofdm Systems ◽  
Hybrid Arq

Intercarrier-Interference-Aware Energy Saving for High-Mobility Cognitive OFDM Systems

2018 ◽  
Vol E101.B (1) ◽  
pp. 203-212
Author(s):  
Wenjun XU ◽  
Xuemei ZHOU ◽  
Yanda CHEN ◽  
Zhihui LIU ◽  
Zhiyong FENG
Keyword(s):  
Energy Saving ◽  
High Mobility ◽  
Intercarrier Interference ◽  
Ofdm Systems

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.

scholarly journals A Radon Slantlet Transforms Based OFDM System Design and Performance Simulation under Different Channel Conditions

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Abbas Hasan Kattoush
Keyword(s):  
Radon Transform ◽  
Spectral Efficiency ◽  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Additive White Gaussian Noise ◽  
Mapping Technique ◽  
Intercarrier Interference ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Channel Parameters

Due to its good orthogonality, slantlet transform (SLT) is used in orthogonal frequency division multiplexing (OFDM) systems to reduce intersymbol interference (ISI) and intercarrier interference (ICI). This eliminates the need for cyclic prefix (CP) and increases the spectral efficiency of the design. Finite Radon transform (FRAT) mapper has the ability to increase orthogonality of subcarriers, is nonsensitive to channel parameters variations, and has a small constellation energy compared with conventional fast-Fourier-transform- (FFT-) based OFDM. It is also able to work as a good interleaver, which significantly reduces the bit error rate (BER). In this paper both FRAT mapping technique and SLT modulator are implemented in a new design of an OFDM system. The new structure was tested and compared with conventional FFT-based OFDM, Radon transform-based OFDM, and SLT-based OFDM for additive white Gaussian noise (AWGN) channel, flat fading channel (FFC), and multipath selective fading channel (SFC). Simulation tests were generated for different channel parameters values. The obtained results showed that the proposed system has increased the spectral efficiency, reduced ISI and ICI, and improved BER performance compared with other systems.

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