Pseudo pilot-aided OFDM system with high spectral efficiency for high performance coaxial transmission

2016 ◽  
Vol 60 (6) ◽  
Author(s):  
Yue Liu ◽  
Chuanchuan Yang ◽  
Hongbin Li
Keyword(s):  
Spectral Efficiency ◽  
High Performance ◽  
Ofdm System ◽  
High Spectral Efficiency

scholarly journals Analysis of Doppler frequency shift response mechanism based on OFDM system

2018 ◽  
Vol 232 ◽  
pp. 04049
Author(s):  
Ke Li ◽  
Zhiguo Sun ◽  
Xiaoyan Ning ◽  
Ming Diao
Keyword(s):  
Spectral Efficiency ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Response Mechanism ◽  
Ofdm System ◽  
System Parameters ◽  
Shift Response ◽  
High Spectral Efficiency ◽  
High Dynamic ◽  
Response Formula

OFDM system is widely used in mobile communication because of its high spectral efficiency and strong anti-multipath capability. However, in high dynamic scenarios, the Doppler shift between the transmitter and the receiver destroys the orthogonality between the sub-carriers, resulting the interference between the sub-carriers and distortion of the signal, which greatly degrades the system performance. In this paper, a mathematical model of Offset-OFDM system was established and the Doppler response formula of OFDM system in high white channel was derived. Furthermore, we investigated the factors that influence the performance of OFDM. This study laid the foundation for determining OFDM system parameters in high dynamic scenarios.

An Improved Algorithm Based on Optimized PTS in MIMO-OFDM System

2013 ◽  
Vol 765-767 ◽  
pp. 2801-2804
Author(s):  
Ya Jing Wang ◽  
Ya Zhen Li ◽  
Li Qun Huang
Keyword(s):  
Spectral Efficiency ◽  
Communication System ◽  
High Speed ◽  
Fourth Generation ◽  
Ofdm System ◽  
Broadband Wireless ◽  
High Spectral Efficiency ◽  
Mimo Ofdm ◽  
Simulation Results ◽  
Improved Algorithm

The fourth generation mobile communication system is a high-speed broadband wireless communication system, it needs MIMO and OFDM technology which have high spectral efficiency and suitable for a multi-path fading channel. Because the MIMO-OFDM system is still an multi-carrier modulation system, the main drawback is the high PAPR value. This paper proposed an improved algorithm based on optimized PTS to reduce PAPR in STBC MIMO-OFDM system. The simulation results show that the improved algorithm can effectively reduce the PAPR value and do not increase the amount of computation in STBC MIMO-OFDM system.

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.

A Data Aided Estimation Algorithm of Decimal Frequency Offset for OFDM System

2014 ◽  
Vol 902 ◽  
pp. 385-391
Author(s):  
Yun Tang ◽  
Feng Zheng ◽  
Hang Liu ◽  
Tian Qi Miao
Keyword(s):  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Estimation Algorithm ◽  
Frequency Offset ◽  
Frequency Division ◽  
Ofdm System ◽  
Mechanism Of Formation ◽  
High Spectral Efficiency ◽  
Simulation Results ◽  
Better Than

In recent years, orthogonal frequency division multiplexing (OFDM) technology has drawn widespread attention for its high spectral efficiency, and has doing better on combating multipath interference than traditional technology.The reason why OFDM system has high spectral efficiency is that it takes advantage of the orthogonality between sub-carriers,characteristic of which can eliminate interference of each subcarrier even when the spectrum of them overlapped.It is the demanding of orthogonality between subcarriers to demodulate signals that makes OFDM system extremely sensitive to frequency offset. Even a little frequency offset can bring inter-carrier interference.This paper studied the mechanism of formation of interference among sub-carriers, and proposed a frequency offset estimation algorithm by changing the structure of data symbols so that the data symbols can act as training sequence.The simulation results show that the proposed algorithm performs better than S.C algorithm in many aspects, such as MSE, BER, Constellation and so on.

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