Time-Frequency Training OFDM with High Spectral Efficiency and Improved Performance over Fast Fading Channels

2011 ◽  
Author(s):  
Linglong Dai ◽  
Zhaocheng Wang ◽  
Jintao Wang ◽  
Jun Wang
Keyword(s):  
Fading Channels ◽  
Spectral Efficiency ◽  
Time Frequency ◽  
Fast Fading ◽  
High Spectral Efficiency ◽  
Improved Performance

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

Space-time TCM with improved performance on fast fading channels

2001 ◽  
Vol 5 (4) ◽  
pp. 154-156 ◽  
Author(s):  
W. Firmanto ◽  
B.S. Vucetic ◽  
J. Yuan
Keyword(s):  
Fading Channels ◽  
Space Time ◽  
Fast Fading ◽  
Improved Performance

Enhancement of Performance of Multi Diagonal Code OCDMA System Using OFDM Technique

2014 ◽  
Vol 679 ◽  
pp. 30-34 ◽  
Author(s):  
A.O. Aldhaibani ◽  
S.A. Aljunid ◽  
M.S. Anuar ◽  
A.R. Arief
Keyword(s):  
Cost Effectiveness ◽  
Spectral Efficiency ◽  
High Capacity ◽  
Access Networks ◽  
Next Generation Networks ◽  
High Spectral Efficiency ◽  
Efficiency Cost ◽  
Promising Solution ◽  
Improved Performance ◽  
Theoretical Results

In this paper, we describe the improved performance of the SAC-OCDMA system using OFDM technique compared to SCM/SAC-OCDMA system. The theoretical results of proposed system shows that the new SAC/OCDMA system with OFDM technique provides better performance compared to SCM/OCDMA system based on multi diagonal code (MD), and the results have been evaluated based on BER and number of users for bit rate 1Gb/s and 10 Gb/s . Thus this system could be a promising solution to symmetric high capacity access networks with high spectral efficiency, cost effectiveness, good flexibility and enhanced security, which is candidate for next generation networks.

scholarly journals WRELM based CO-OFDM system with improved performance, spectral efficiency and computational complexity

2021 ◽  
Author(s):  
Gurpreet Kaur ◽  
Gurmeet Kaur
Keyword(s):  
Phase Noise ◽  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fourier Transforms ◽  
Wavelet Packet ◽  
Discrete Wavelet ◽  
Ofdm System ◽  
High Spectral Efficiency ◽  
Improved Performance ◽  
Learning Machine

Abstract Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) system with Pilot-free phase noise compensator was introduced in order to accomplish the need of high spectral efficiency in the optical communication. In CO-OFDM system Discrete wavelet packet transforms (DWPTs) in place of Fast Fourier Transforms (FFTs) had attracted more attention since it has removed the need of cyclic prefix used to compensate fiber dispersion. In this paper, a DWPT based CO-OFDM system with Wilcoxon Robust Extreme Learning Machine based pilot-free phase noise compensator using multi-level QPSK partitioning of 16-QAM has been proposed. From the results of this work it has been seen that the percentage improvement in performance (in terms of Q-Factor) and spectral efficiency over traditional pilot-aided techniques is approximately 6 and 21 respectively. Moreover, this proposed work will comparatively reduce the overall system complexity.

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